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Annotation of GNUtools/cc/config/rs6000/rs6000.h, revision 1.1

1.1     ! root        1: /* Definitions of target machine for GNU compiler, for IBM RS/6000.
        !             2:    Copyright (C) 1992, 1993 Free Software Foundation, Inc.
        !             3:    Contributed by Richard Kenner ([email protected])
        !             4: 
        !             5: This file is part of GNU CC.
        !             6: 
        !             7: GNU CC is free software; you can redistribute it and/or modify
        !             8: it under the terms of the GNU General Public License as published by
        !             9: the Free Software Foundation; either version 2, or (at your option)
        !            10: any later version.
        !            11: 
        !            12: GNU CC is distributed in the hope that it will be useful,
        !            13: but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            14: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            15: GNU General Public License for more details.
        !            16: 
        !            17: You should have received a copy of the GNU General Public License
        !            18: along with GNU CC; see the file COPYING.  If not, write to
        !            19: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
        !            20: 
        !            21: 
        !            22: /* Note that some other tm.h files include this one and then override
        !            23:    many of the definitions that relate to assembler syntax.  */
        !            24: 
        !            25: 
        !            26: /* Names to predefine in the preprocessor for this target machine.  */
        !            27: 
        !            28: #define CPP_PREDEFINES "-D_IBMR2 -D_AIX -D_AIX32 -Asystem(unix) -Asystem(aix) -Acpu(rs6000) -Amachine(rs6000)"
        !            29: 
        !            30: /* Print subsidiary information on the compiler version in use.  */
        !            31: #define TARGET_VERSION ;
        !            32: 
        !            33: /* Tell the assembler to assume that all undefined names are external.
        !            34: 
        !            35:    Don't do this until the fixed IBM assembler is more generally available.
        !            36:    When this becomes permanently defined, the ASM_OUTPUT_EXTERNAL,
        !            37:    ASM_OUTPUT_EXTERNAL_LIBCALL, and RS6000_OUTPUT_BASENAME macros will no
        !            38:    longer be needed.  Also, the extern declaration of mcount in ASM_FILE_START
        !            39:    will no longer be needed.  */
        !            40: 
        !            41: /* #define ASM_SPEC "-u" */
        !            42: 
        !            43: /* Define the options for the binder: Start text at 512, align all segments
        !            44:    to 512 bytes, and warn if there is text relocation.
        !            45: 
        !            46:    The -bhalt:4 option supposedly changes the level at which ld will abort,
        !            47:    but it also suppresses warnings about multiply defined symbols and is
        !            48:    used by the AIX cc command.  So we use it here.
        !            49: 
        !            50:    -bnodelcsect undoes a poor choice of default relating to multiply-defined
        !            51:    csects.  See AIX documentation for more information about this.  */
        !            52: 
        !            53: #define LINK_SPEC "-T512 -H512 %{!r:-btextro} -bhalt:4 -bnodelcsect\
        !            54:    %{static:-bnso -bI:/lib/syscalls.exp} %{g*:-bexport:/usr/lib/libg.exp}"
        !            55: 
        !            56: /* Profiled library versions are used by linking with special directories.  */
        !            57: #define LIB_SPEC "%{pg:-L/lib/profiled -L/usr/lib/profiled}\
        !            58:    %{p:-L/lib/profiled -L/usr/lib/profiled} %{g*:-lg} -lc"
        !            59: 
        !            60: /* gcc must do the search itself to find libgcc.a, not use -l.  */
        !            61: #define LINK_LIBGCC_SPECIAL_1
        !            62: 
        !            63: /* Don't turn -B into -L if the argument specifies a relative file name.  */
        !            64: #define RELATIVE_PREFIX_NOT_LINKDIR
        !            65: 
        !            66: /* Architecture type.  */
        !            67: 
        !            68: extern int target_flags;
        !            69: 
        !            70: /* Use POWER architecture instructions and MQ register.  */
        !            71: #define MASK_POWER             0x01
        !            72: 
        !            73: /* Use POWER2 extensions to POWER architecture.  */
        !            74: #define MASK_POWER2            0x02
        !            75: 
        !            76: /* Use PowerPC architecture instructions.  */
        !            77: #define MASK_POWERPC           0x04
        !            78: 
        !            79: /* Use PowerPC square root instructions.  */
        !            80: #define MASK_POWERPCSQR                0x08
        !            81: 
        !            82: /* Use PowerPC-64 architecture instructions.  */
        !            83: #define MASK_POWERPC64         0x10
        !            84: 
        !            85: /* Use revised mnemonic names defined for PowerPC architecture.  */
        !            86: #define MASK_NEW_MNEMONICS     0x20
        !            87: 
        !            88: /* Disable placing fp constants in the TOC; can be turned on when the
        !            89:    TOC overflows.  */
        !            90: #define MASK_NO_FP_IN_TOC      0x40
        !            91: 
        !            92: /* Output only one TOC entry per module.  Normally linking fails if
        !            93:    there are more than 16K unique variables/constants in an executable.  With
        !            94:    this option, linking fails only if there are more than 16K modules, or
        !            95:    if there are more than 16K unique variables/constant in a single module.
        !            96: 
        !            97:    This is at the cost of having 2 extra loads and one extra store per
        !            98:    function, and one less allocatable register.  */
        !            99: #define MASK_MINIMAL_TOC       0x80
        !           100: 
        !           101: #define TARGET_POWER                   (target_flags & MASK_POWER)
        !           102: #define TARGET_POWER2                  (target_flags & MASK_POWER2)
        !           103: #define TARGET_POWERPC                 (target_flags & MASK_POWERPC)
        !           104: #define TARGET_POWERPCSQR              (target_flags & MASK_POWERPCSQR)
        !           105: #define TARGET_POWERPC64               (target_flags & MASK_POWERPC64)
        !           106: #define TARGET_NEW_MNEMONICS           (target_flags & MASK_NEW_MNEMONICS)
        !           107: #define TARGET_NO_FP_IN_TOC            (target_flags & MASK_NO_FP_IN_TOC)
        !           108: #define TARGET_MINIMAL_TOC             (target_flags & MASK_MINIMAL_TOC)
        !           109: 
        !           110: /* Run-time compilation parameters selecting different hardware subsets.
        !           111: 
        !           112:    Macro to define tables used to set the flags.
        !           113:    This is a list in braces of pairs in braces,
        !           114:    each pair being { "NAME", VALUE }
        !           115:    where VALUE is the bits to set or minus the bits to clear.
        !           116:    An empty string NAME is used to identify the default VALUE.  */
        !           117: 
        !           118: #define TARGET_SWITCHES                                                \
        !           119:  {{"power",            MASK_POWER},                            \
        !           120:   {"power2",           MASK_POWER | MASK_POWER2},              \
        !           121:   {"no-power2",                - MASK_POWER2},                         \
        !           122:   {"no-power",         - (MASK_POWER | MASK_POWER2)},          \
        !           123:   {"powerpc",          MASK_POWERPC},                          \
        !           124:   {"no-powerpc",       - (MASK_POWERPC | MASK_POWERPCSQR | MASK_POWERPC64)}, \
        !           125:   {"powerpc-sqr",      MASK_POWERPC | MASK_POWERPCSQR},        \
        !           126:   {"no-powerpc-sqr",   - MASK_POWERPCSQR},                     \
        !           127:   {"powerpc64",                MASK_POWERPC | MASK_POWERPC64},         \
        !           128:   {"no-powerpc64",     -MASK_POWERPC64},                       \
        !           129:   {"new-mnemonics",    MASK_NEW_MNEMONICS},                    \
        !           130:   {"old-mnemonics",    -MASK_NEW_MNEMONICS},                   \
        !           131:   {"normal-toc",       - (MASK_NO_FP_IN_TOC | MASK_MINIMAL_TOC)}, \
        !           132:   {"fp-in-toc",                - MASK_NO_FP_IN_TOC},                   \
        !           133:   {"no-fp-in-toc",     MASK_NO_FP_IN_TOC},                     \
        !           134:   {"minimal-toc",      MASK_MINIMAL_TOC},                      \
        !           135:   {"no-minimal-toc",   - MASK_MINIMAL_TOC},                    \
        !           136:   {"",                 TARGET_DEFAULT}}
        !           137: 
        !           138: #define TARGET_DEFAULT MASK_POWER
        !           139: 
        !           140: /* Processor type.  */
        !           141: enum processor_type
        !           142:  {PROCESSOR_RIOS1,
        !           143:   PROCESSOR_RIOS2,
        !           144:   PROCESSOR_PPC601,
        !           145:   PROCESSOR_PPC603,
        !           146:   PROCESSOR_PPC604,
        !           147:   PROCESSOR_PPC620};
        !           148: 
        !           149: extern enum processor_type rs6000_cpu;
        !           150: 
        !           151: /* Recast the processor type to the cpu attribute.  */
        !           152: #define rs6000_cpu_attr ((enum attr_cpu)rs6000_cpu)
        !           153: 
        !           154: /* Define the default processor.  This is overridden by other tm.h files.  */
        !           155: #define PROCESSOR_DEFAULT PROCESSOR_RIOS1
        !           156: 
        !           157: /* Specify the dialect of assembler to use.  New mnemonics is dialect one
        !           158:    and the old mnemonics are dialect zero.  */
        !           159: #define ASSEMBLER_DIALECT TARGET_NEW_MNEMONICS ? 1 : 0
        !           160: 
        !           161: /* This macro is similar to `TARGET_SWITCHES' but defines names of
        !           162:    command options that have values.  Its definition is an
        !           163:    initializer with a subgrouping for each command option.
        !           164: 
        !           165:    Each subgrouping contains a string constant, that defines the
        !           166:    fixed part of the option name, and the address of a variable.
        !           167:    The variable, type `char *', is set to the variable part of the
        !           168:    given option if the fixed part matches.  The actual option name
        !           169:    is made by appending `-m' to the specified name.
        !           170: 
        !           171:    Here is an example which defines `-mshort-data-NUMBER'.  If the
        !           172:    given option is `-mshort-data-512', the variable `m88k_short_data'
        !           173:    will be set to the string `"512"'.
        !           174: 
        !           175:        extern char *m88k_short_data;
        !           176:        #define TARGET_OPTIONS { { "short-data-", &m88k_short_data } }  */
        !           177: 
        !           178: #define TARGET_OPTIONS         \
        !           179: { {"cpu=", &rs6000_cpu_string}}
        !           180: 
        !           181: extern char *rs6000_cpu_string;
        !           182: 
        !           183: /* Sometimes certain combinations of command options do not make sense
        !           184:    on a particular target machine.  You can define a macro
        !           185:    `OVERRIDE_OPTIONS' to take account of this.  This macro, if
        !           186:    defined, is executed once just after all the command options have
        !           187:    been parsed.
        !           188: 
        !           189:    On the RS/6000 this is used to define the target cpu type.  */
        !           190: 
        !           191: #define OVERRIDE_OPTIONS rs6000_override_options ()
        !           192: 
        !           193: #define OPTIMIZATION_OPTIONS(LEVEL)    \
        !           194: {                                      \
        !           195:   if ((LEVEL) > 0)                     \
        !           196:     {                                  \
        !           197:       flag_force_mem = 1;              \
        !           198:       flag_omit_frame_pointer = 1;     \
        !           199:     }                                  \
        !           200: }
        !           201: 
        !           202: /* target machine storage layout */
        !           203: 
        !           204: /* Define this macro if it is advisable to hold scalars in registers
        !           205:    in a wider mode than that declared by the program.  In such cases, 
        !           206:    the value is constrained to be within the bounds of the declared
        !           207:    type, but kept valid in the wider mode.  The signedness of the
        !           208:    extension may differ from that of the type.  */
        !           209: 
        !           210: #define PROMOTE_MODE(MODE,UNSIGNEDP,TYPE)  \
        !           211:   if (GET_MODE_CLASS (MODE) == MODE_INT        \
        !           212:       && GET_MODE_SIZE (MODE) < 4)     \
        !           213:     (MODE) = SImode;
        !           214: 
        !           215: /* Define this if most significant bit is lowest numbered
        !           216:    in instructions that operate on numbered bit-fields. */
        !           217: /* That is true on RS/6000. */
        !           218: #define BITS_BIG_ENDIAN 1
        !           219: 
        !           220: /* Define this if most significant byte of a word is the lowest numbered.  */
        !           221: /* That is true on RS/6000.  */
        !           222: #define BYTES_BIG_ENDIAN 1
        !           223: 
        !           224: /* Define this if most significant word of a multiword number is lowest
        !           225:    numbered. 
        !           226: 
        !           227:    For RS/6000 we can decide arbitrarily since there are no machine
        !           228:    instructions for them.  Might as well be consistent with bits and bytes. */
        !           229: #define WORDS_BIG_ENDIAN 1
        !           230: 
        !           231: /* number of bits in an addressable storage unit */
        !           232: #define BITS_PER_UNIT 8
        !           233: 
        !           234: /* Width in bits of a "word", which is the contents of a machine register.
        !           235:    Note that this is not necessarily the width of data type `int';
        !           236:    if using 16-bit ints on a 68000, this would still be 32.
        !           237:    But on a machine with 16-bit registers, this would be 16.  */
        !           238: #define BITS_PER_WORD 32
        !           239: 
        !           240: /* Width of a word, in units (bytes).  */
        !           241: #define UNITS_PER_WORD 4
        !           242: 
        !           243: /* Type used for ptrdiff_t, as a string used in a declaration.  */
        !           244: #define PTRDIFF_TYPE "int"
        !           245: 
        !           246: /* Type used for wchar_t, as a string used in a declaration.  */
        !           247: #define WCHAR_TYPE "short unsigned int"
        !           248: 
        !           249: /* Width of wchar_t in bits.  */
        !           250: #define WCHAR_TYPE_SIZE 16
        !           251: 
        !           252: /* Width in bits of a pointer.
        !           253:    See also the macro `Pmode' defined below.  */
        !           254: #define POINTER_SIZE 32
        !           255: 
        !           256: /* Allocation boundary (in *bits*) for storing arguments in argument list.  */
        !           257: #define PARM_BOUNDARY 32
        !           258: 
        !           259: /* Boundary (in *bits*) on which stack pointer should be aligned.  */
        !           260: #define STACK_BOUNDARY 64
        !           261: 
        !           262: /* Allocation boundary (in *bits*) for the code of a function.  */
        !           263: #define FUNCTION_BOUNDARY 32
        !           264: 
        !           265: /* No data type wants to be aligned rounder than this.  */
        !           266: #define BIGGEST_ALIGNMENT 32
        !           267: 
        !           268: /* Alignment of field after `int : 0' in a structure.  */
        !           269: #define EMPTY_FIELD_BOUNDARY 32
        !           270: 
        !           271: /* Every structure's size must be a multiple of this.  */
        !           272: #define STRUCTURE_SIZE_BOUNDARY 8
        !           273: 
        !           274: /* A bitfield declared as `int' forces `int' alignment for the struct.  */
        !           275: #define PCC_BITFIELD_TYPE_MATTERS 1
        !           276: 
        !           277: /* Make strings word-aligned so strcpy from constants will be faster.  */
        !           278: #define CONSTANT_ALIGNMENT(EXP, ALIGN)  \
        !           279:   (TREE_CODE (EXP) == STRING_CST       \
        !           280:    && (ALIGN) < BITS_PER_WORD ? BITS_PER_WORD : (ALIGN))
        !           281: 
        !           282: /* Make arrays of chars word-aligned for the same reasons.  */
        !           283: #define DATA_ALIGNMENT(TYPE, ALIGN)            \
        !           284:   (TREE_CODE (TYPE) == ARRAY_TYPE              \
        !           285:    && TYPE_MODE (TREE_TYPE (TYPE)) == QImode   \
        !           286:    && (ALIGN) < BITS_PER_WORD ? BITS_PER_WORD : (ALIGN))
        !           287: 
        !           288: /* Non-zero if move instructions will actually fail to work
        !           289:    when given unaligned data.  */
        !           290: #define STRICT_ALIGNMENT 0
        !           291: 
        !           292: /* Standard register usage.  */
        !           293: 
        !           294: /* Number of actual hardware registers.
        !           295:    The hardware registers are assigned numbers for the compiler
        !           296:    from 0 to just below FIRST_PSEUDO_REGISTER.
        !           297:    All registers that the compiler knows about must be given numbers,
        !           298:    even those that are not normally considered general registers.
        !           299: 
        !           300:    RS/6000 has 32 fixed-point registers, 32 floating-point registers,
        !           301:    an MQ register, a count register, a link register, and 8 condition
        !           302:    register fields, which we view here as separate registers.
        !           303: 
        !           304:    In addition, the difference between the frame and argument pointers is
        !           305:    a function of the number of registers saved, so we need to have a
        !           306:    register for AP that will later be eliminated in favor of SP or FP.
        !           307:    This is a normal register, but it is fixed.  */
        !           308: 
        !           309: #define FIRST_PSEUDO_REGISTER 76
        !           310: 
        !           311: /* 1 for registers that have pervasive standard uses
        !           312:    and are not available for the register allocator.
        !           313: 
        !           314:    On RS/6000, r1 is used for the stack and r2 is used as the TOC pointer.  
        !           315: 
        !           316:    cr5 is not supposed to be used.  */
        !           317: 
        !           318: #define FIXED_REGISTERS  \
        !           319:   {0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
        !           320:    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
        !           321:    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
        !           322:    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
        !           323:    0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0}
        !           324: 
        !           325: /* 1 for registers not available across function calls.
        !           326:    These must include the FIXED_REGISTERS and also any
        !           327:    registers that can be used without being saved.
        !           328:    The latter must include the registers where values are returned
        !           329:    and the register where structure-value addresses are passed.
        !           330:    Aside from that, you can include as many other registers as you like.  */
        !           331: 
        !           332: #define CALL_USED_REGISTERS  \
        !           333:   {1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, \
        !           334:    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
        !           335:    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, \
        !           336:    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
        !           337:    1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1}
        !           338: 
        !           339: /* List the order in which to allocate registers.  Each register must be
        !           340:    listed once, even those in FIXED_REGISTERS.
        !           341: 
        !           342:    We allocate in the following order:
        !           343:        fp0             (not saved or used for anything)
        !           344:        fp13 - fp2      (not saved; incoming fp arg registers)
        !           345:        fp1             (not saved; return value)
        !           346:        fp31 - fp14     (saved; order given to save least number)
        !           347:        cr1, cr6, cr7   (not saved or special)
        !           348:        cr0             (not saved, but used for arithmetic operations)
        !           349:        cr2, cr3, cr4   (saved)
        !           350:         r0             (not saved; cannot be base reg)
        !           351:        r9              (not saved; best for TImode)
        !           352:        r11, r10, r8-r4 (not saved; highest used first to make less conflict)
        !           353:        r3              (not saved; return value register)
        !           354:        r31 - r13       (saved; order given to save least number)
        !           355:        r12             (not saved; if used for DImode or DFmode would use r13)
        !           356:        mq              (not saved; best to use it if we can)
        !           357:        ctr             (not saved; when we have the choice ctr is better)
        !           358:        lr              (saved)
        !           359:         cr5, r1, r2, ap        (fixed)  */
        !           360: 
        !           361: #define REG_ALLOC_ORDER                                        \
        !           362:   {32,                                                         \
        !           363:    45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34,     \
        !           364:    33,                                                 \
        !           365:    63, 62, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, \
        !           366:    50, 49, 48, 47, 46,                                         \
        !           367:    69, 74, 75, 68, 70, 71, 72,                         \
        !           368:    0,                                                  \
        !           369:    9, 11, 10, 8, 7, 6, 5, 4,                           \
        !           370:    3,                                                  \
        !           371:    31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, \
        !           372:    18, 17, 16, 15, 14, 13, 12,                         \
        !           373:    64, 66, 65,                                                 \
        !           374:    73, 1, 2, 67}
        !           375: 
        !           376: /* True if register is floating-point.  */
        !           377: #define FP_REGNO_P(N) ((N) >= 32 && (N) <= 63)
        !           378: 
        !           379: /* True if register is a condition register.  */
        !           380: #define CR_REGNO_P(N) ((N) >= 68 && (N) <= 75)
        !           381: 
        !           382: /* True if register is an integer register.  */
        !           383: #define INT_REGNO_P(N) ((N) <= 31 || (N) == 67)
        !           384: 
        !           385: /* Return number of consecutive hard regs needed starting at reg REGNO
        !           386:    to hold something of mode MODE.
        !           387:    This is ordinarily the length in words of a value of mode MODE
        !           388:    but can be less for certain modes in special long registers.
        !           389: 
        !           390:    On RS/6000, ordinary registers hold 32 bits worth;
        !           391:    a single floating point register holds 64 bits worth.  */
        !           392: 
        !           393: #define HARD_REGNO_NREGS(REGNO, MODE)   \
        !           394:   (FP_REGNO_P (REGNO)                  \
        !           395:    ? ((GET_MODE_SIZE (MODE) + 2 * UNITS_PER_WORD - 1) / (2 * UNITS_PER_WORD)) \
        !           396:    : ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD))
        !           397: 
        !           398: /* Value is 1 if hard register REGNO can hold a value of machine-mode MODE.
        !           399:    On RS/6000, the cpu registers can hold any mode but the float registers
        !           400:    can hold only floating modes and CR register can only hold CC modes.  We
        !           401:    cannot put DImode or TImode anywhere except general register and they
        !           402:    must be able to fit within the register set.  */
        !           403: 
        !           404: #define HARD_REGNO_MODE_OK(REGNO, MODE) \
        !           405:   (FP_REGNO_P (REGNO) ? GET_MODE_CLASS (MODE) == MODE_FLOAT    \
        !           406:    : CR_REGNO_P (REGNO) ? GET_MODE_CLASS (MODE) == MODE_CC     \
        !           407:    : ! INT_REGNO_P (REGNO) ? (GET_MODE_CLASS (MODE) == MODE_INT  \
        !           408:                              && GET_MODE_SIZE (MODE) <= UNITS_PER_WORD)  \
        !           409:    : 1)
        !           410: 
        !           411: /* Value is 1 if it is a good idea to tie two pseudo registers
        !           412:    when one has mode MODE1 and one has mode MODE2.
        !           413:    If HARD_REGNO_MODE_OK could produce different values for MODE1 and MODE2,
        !           414:    for any hard reg, then this must be 0 for correct output.  */
        !           415: #define MODES_TIEABLE_P(MODE1, MODE2) \
        !           416:   (GET_MODE_CLASS (MODE1) == MODE_FLOAT                \
        !           417:    ? GET_MODE_CLASS (MODE2) == MODE_FLOAT      \
        !           418:    : GET_MODE_CLASS (MODE2) == MODE_FLOAT      \
        !           419:    ? GET_MODE_CLASS (MODE1) == MODE_FLOAT      \
        !           420:    : GET_MODE_CLASS (MODE1) == MODE_CC         \
        !           421:    ? GET_MODE_CLASS (MODE2) == MODE_CC         \
        !           422:    : GET_MODE_CLASS (MODE2) == MODE_CC         \
        !           423:    ? GET_MODE_CLASS (MODE1) == MODE_CC         \
        !           424:    : 1)
        !           425: 
        !           426: /* A C expression returning the cost of moving data from a register of class
        !           427:    CLASS1 to one of CLASS2.
        !           428: 
        !           429:    On the RS/6000, copying between floating-point and fixed-point
        !           430:    registers is expensive.  */
        !           431: 
        !           432: #define REGISTER_MOVE_COST(CLASS1, CLASS2)                     \
        !           433:   ((CLASS1) == FLOAT_REGS && (CLASS2) == FLOAT_REGS ? 2                \
        !           434:    : (CLASS1) == FLOAT_REGS && (CLASS2) != FLOAT_REGS ? 10     \
        !           435:    : (CLASS1) != FLOAT_REGS && (CLASS2) == FLOAT_REGS ? 10     \
        !           436:    : 2)
        !           437: 
        !           438: /* A C expressions returning the cost of moving data of MODE from a register to
        !           439:    or from memory.
        !           440: 
        !           441:    On the RS/6000, bump this up a bit.  */
        !           442: 
        !           443: #define MEMORY_MOVE_COST(MODE)  6
        !           444: 
        !           445: /* Specify the cost of a branch insn; roughly the number of extra insns that
        !           446:    should be added to avoid a branch.
        !           447: 
        !           448:    Set this to 3 on the RS/6000 since that is roughly the average cost of an
        !           449:    unscheduled conditional branch.  */
        !           450: 
        !           451: #define BRANCH_COST 3
        !           452: 
        !           453: /* A C statement (sans semicolon) to update the integer variable COST
        !           454:    based on the relationship between INSN that is dependent on
        !           455:    DEP_INSN through the dependence LINK.  The default is to make no
        !           456:    adjustment to COST.  On the RS/6000, ignore the cost of anti- and
        !           457:    output-dependencies.  In fact, output dependencies on the CR do have
        !           458:    a cost, but it is probably not worthwhile to track it.  */
        !           459: 
        !           460: #define ADJUST_COST(INSN,LINK,DEP_INSN,COST)                           \
        !           461:   if (REG_NOTE_KIND (LINK) != 0)                                       \
        !           462:     (COST) = 0; /* Anti or output dependence.  */
        !           463: 
        !           464: /* Define this macro to change register usage conditional on target flags.
        !           465:    Set MQ register fixed (already call_used) if not POWER architecture
        !           466:    (RIOS1, RIOS2, and PPC601) so that it will not be allocated.
        !           467:    Provide alternate register names for ppcas assembler */
        !           468: 
        !           469: #define CONDITIONAL_REGISTER_USAGE                                     \
        !           470:     if (!TARGET_POWER)                                                 \
        !           471:        fixed_regs[64] = 1;
        !           472: 
        !           473: /* Specify the registers used for certain standard purposes.
        !           474:    The values of these macros are register numbers.  */
        !           475: 
        !           476: /* RS/6000 pc isn't overloaded on a register that the compiler knows about.  */
        !           477: /* #define PC_REGNUM  */
        !           478: 
        !           479: /* Register to use for pushing function arguments.  */
        !           480: #define STACK_POINTER_REGNUM 1
        !           481: 
        !           482: /* Base register for access to local variables of the function.  */
        !           483: #define FRAME_POINTER_REGNUM 31
        !           484: 
        !           485: /* Value should be nonzero if functions must have frame pointers.
        !           486:    Zero means the frame pointer need not be set up (and parms
        !           487:    may be accessed via the stack pointer) in functions that seem suitable.
        !           488:    This is computed in `reload', in reload1.c.  */
        !           489: #define FRAME_POINTER_REQUIRED 0
        !           490: 
        !           491: /* Base register for access to arguments of the function.  */
        !           492: #define ARG_POINTER_REGNUM 67
        !           493: 
        !           494: /* Place to put static chain when calling a function that requires it.  */
        !           495: #define STATIC_CHAIN_REGNUM 11
        !           496: 
        !           497: /* Place that structure value return address is placed.
        !           498: 
        !           499:    On the RS/6000, it is passed as an extra parameter.  */
        !           500: #define STRUCT_VALUE   0
        !           501: 
        !           502: /* Define the classes of registers for register constraints in the
        !           503:    machine description.  Also define ranges of constants.
        !           504: 
        !           505:    One of the classes must always be named ALL_REGS and include all hard regs.
        !           506:    If there is more than one class, another class must be named NO_REGS
        !           507:    and contain no registers.
        !           508: 
        !           509:    The name GENERAL_REGS must be the name of a class (or an alias for
        !           510:    another name such as ALL_REGS).  This is the class of registers
        !           511:    that is allowed by "g" or "r" in a register constraint.
        !           512:    Also, registers outside this class are allocated only when
        !           513:    instructions express preferences for them.
        !           514: 
        !           515:    The classes must be numbered in nondecreasing order; that is,
        !           516:    a larger-numbered class must never be contained completely
        !           517:    in a smaller-numbered class.
        !           518: 
        !           519:    For any two classes, it is very desirable that there be another
        !           520:    class that represents their union.  */
        !           521:    
        !           522: /* The RS/6000 has three types of registers, fixed-point, floating-point,
        !           523:    and condition registers, plus three special registers, MQ, CTR, and the
        !           524:    link register.
        !           525: 
        !           526:    However, r0 is special in that it cannot be used as a base register.
        !           527:    So make a class for registers valid as base registers.
        !           528: 
        !           529:    Also, cr0 is the only condition code register that can be used in
        !           530:    arithmetic insns, so make a separate class for it. */
        !           531: 
        !           532: enum reg_class { NO_REGS, BASE_REGS, GENERAL_REGS, FLOAT_REGS,
        !           533:   NON_SPECIAL_REGS, MQ_REGS, LINK_REGS, CTR_REGS, LINK_OR_CTR_REGS,
        !           534:   SPECIAL_REGS, SPEC_OR_GEN_REGS, CR0_REGS, CR_REGS, NON_FLOAT_REGS,
        !           535:   ALL_REGS, LIM_REG_CLASSES };
        !           536: 
        !           537: #define N_REG_CLASSES (int) LIM_REG_CLASSES
        !           538: 
        !           539: /* Give names of register classes as strings for dump file.   */
        !           540: 
        !           541: #define REG_CLASS_NAMES                                                \
        !           542:   { "NO_REGS", "BASE_REGS", "GENERAL_REGS", "FLOAT_REGS",      \
        !           543:     "NON_SPECIAL_REGS", "MQ_REGS", "LINK_REGS", "CTR_REGS",    \
        !           544:     "LINK_OR_CTR_REGS", "SPECIAL_REGS", "SPEC_OR_GEN_REGS",    \
        !           545:     "CR0_REGS", "CR_REGS", "NON_FLOAT_REGS", "ALL_REGS" }
        !           546: 
        !           547: /* Define which registers fit in which classes.
        !           548:    This is an initializer for a vector of HARD_REG_SET
        !           549:    of length N_REG_CLASSES.  */
        !           550: 
        !           551: #define REG_CLASS_CONTENTS                             \
        !           552:   { {0, 0, 0}, {0xfffffffe, 0, 8}, {~0, 0, 8},         \
        !           553:     {0, ~0, 0}, {~0, ~0, 8}, {0, 0, 1}, {0, 0, 2},     \
        !           554:     {0, 0, 4}, {0, 0, 6}, {0, 0, 7}, {~0, 0, 15},      \
        !           555:     {0, 0, 16}, {0, 0, 0xff0}, {~0, 0, 0xffff},                \
        !           556:     {~0, ~0, 0xffff} }
        !           557: 
        !           558: /* The same information, inverted:
        !           559:    Return the class number of the smallest class containing
        !           560:    reg number REGNO.  This could be a conditional expression
        !           561:    or could index an array.  */
        !           562: 
        !           563: #define REGNO_REG_CLASS(REGNO) \
        !           564:  ((REGNO) == 0 ? GENERAL_REGS  \
        !           565:   : (REGNO) < 32 ? BASE_REGS   \
        !           566:   : FP_REGNO_P (REGNO) ? FLOAT_REGS \
        !           567:   : (REGNO) == 68 ? CR0_REGS   \
        !           568:   : CR_REGNO_P (REGNO) ? CR_REGS \
        !           569:   : (REGNO) == 64 ? MQ_REGS    \
        !           570:   : (REGNO) == 65 ? LINK_REGS  \
        !           571:   : (REGNO) == 66 ? CTR_REGS   \
        !           572:   : (REGNO) == 67 ? BASE_REGS  \
        !           573:   : NO_REGS)
        !           574: 
        !           575: /* The class value for index registers, and the one for base regs.  */
        !           576: #define INDEX_REG_CLASS GENERAL_REGS
        !           577: #define BASE_REG_CLASS BASE_REGS
        !           578: 
        !           579: /* Get reg_class from a letter such as appears in the machine description.  */
        !           580: 
        !           581: #define REG_CLASS_FROM_LETTER(C) \
        !           582:   ((C) == 'f' ? FLOAT_REGS     \
        !           583:    : (C) == 'b' ? BASE_REGS    \
        !           584:    : (C) == 'h' ? SPECIAL_REGS \
        !           585:    : (C) == 'q' ? MQ_REGS      \
        !           586:    : (C) == 'c' ? CTR_REGS     \
        !           587:    : (C) == 'l' ? LINK_REGS    \
        !           588:    : (C) == 'x' ? CR0_REGS     \
        !           589:    : (C) == 'y' ? CR_REGS      \
        !           590:    : NO_REGS)
        !           591: 
        !           592: /* The letters I, J, K, L, M, N, and P in a register constraint string
        !           593:    can be used to stand for particular ranges of immediate operands.
        !           594:    This macro defines what the ranges are.
        !           595:    C is the letter, and VALUE is a constant value.
        !           596:    Return 1 if VALUE is in the range specified by C.
        !           597: 
        !           598:    `I' is signed 16-bit constants 
        !           599:    `J' is a constant with only the high-order 16 bits non-zero
        !           600:    `K' is a constant with only the low-order 16 bits non-zero
        !           601:    `L' is a constant that can be placed into a mask operand
        !           602:    `M' is a constant that is greater than 31
        !           603:    `N' is a constant that is an exact power of two
        !           604:    `O' is the constant zero
        !           605:    `P' is a constant whose negation is a signed 16-bit constant */
        !           606: 
        !           607: #define CONST_OK_FOR_LETTER_P(VALUE, C)                                \
        !           608:    ( (C) == 'I' ? (unsigned) ((VALUE) + 0x8000) < 0x10000      \
        !           609:    : (C) == 'J' ? ((VALUE) & 0xffff) == 0                      \
        !           610:    : (C) == 'K' ? ((VALUE) & 0xffff0000) == 0                  \
        !           611:    : (C) == 'L' ? mask_constant (VALUE)                                \
        !           612:    : (C) == 'M' ? (VALUE) > 31                                 \
        !           613:    : (C) == 'N' ? exact_log2 (VALUE) >= 0                      \
        !           614:    : (C) == 'O' ? (VALUE) == 0                                 \
        !           615:    : (C) == 'P' ? (unsigned) ((- (VALUE)) + 0x8000) < 0x1000   \
        !           616:    : 0)
        !           617: 
        !           618: /* Similar, but for floating constants, and defining letters G and H.
        !           619:    Here VALUE is the CONST_DOUBLE rtx itself.
        !           620: 
        !           621:    We flag for special constants when we can copy the constant into
        !           622:    a general register in two insns for DF and one insn for SF.  */
        !           623: 
        !           624: #define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C)  \
        !           625:   ((C) == 'G' ? easy_fp_constant (VALUE, GET_MODE (VALUE)) : 0)
        !           626: 
        !           627: /* Optional extra constraints for this machine.
        !           628: 
        !           629:    For the RS/6000, `Q' means that this is a memory operand that is just
        !           630:    an offset from a register.  */
        !           631: 
        !           632: #define EXTRA_CONSTRAINT(OP, C)                                                \
        !           633:   ((C) == 'Q' ? GET_CODE (OP) == MEM && GET_CODE (XEXP (OP, 0)) == REG \
        !           634:    : 0)
        !           635: 
        !           636: /* Given an rtx X being reloaded into a reg required to be
        !           637:    in class CLASS, return the class of reg to actually use.
        !           638:    In general this is just CLASS; but on some machines
        !           639:    in some cases it is preferable to use a more restrictive class. 
        !           640: 
        !           641:    On the RS/6000, we have to return NO_REGS when we want to reload a
        !           642:    floating-point CONST_DOUBLE to force it to be copied to memory.  */
        !           643: 
        !           644: #define PREFERRED_RELOAD_CLASS(X,CLASS)        \
        !           645:   ((GET_CODE (X) == CONST_DOUBLE                       \
        !           646:     && GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT)    \
        !           647:    ? NO_REGS : (CLASS))
        !           648:    
        !           649: /* Return the register class of a scratch register needed to copy IN into
        !           650:    or out of a register in CLASS in MODE.  If it can be done directly,
        !           651:    NO_REGS is returned.  */
        !           652: 
        !           653: #define SECONDARY_RELOAD_CLASS(CLASS,MODE,IN) \
        !           654:   secondary_reload_class (CLASS, MODE, IN)
        !           655: 
        !           656: /* If we are copying between FP registers and anything else, we need a memory
        !           657:    location.  */
        !           658: 
        !           659: #define SECONDARY_MEMORY_NEEDED(CLASS1,CLASS2,MODE) \
        !           660:  ((CLASS1) != (CLASS2) && ((CLASS1) == FLOAT_REGS || (CLASS2) == FLOAT_REGS))
        !           661: 
        !           662: /* Return the maximum number of consecutive registers
        !           663:    needed to represent mode MODE in a register of class CLASS.
        !           664: 
        !           665:    On RS/6000, this is the size of MODE in words,
        !           666:    except in the FP regs, where a single reg is enough for two words.  */
        !           667: #define CLASS_MAX_NREGS(CLASS, MODE)   \
        !           668:  ((CLASS) == FLOAT_REGS                        \
        !           669:   ? ((GET_MODE_SIZE (MODE) + 2 * UNITS_PER_WORD - 1) / (2 * UNITS_PER_WORD)) \
        !           670:   : ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD))
        !           671: 
        !           672: /* Stack layout; function entry, exit and calling.  */
        !           673: 
        !           674: /* Define this if pushing a word on the stack
        !           675:    makes the stack pointer a smaller address.  */
        !           676: #define STACK_GROWS_DOWNWARD
        !           677: 
        !           678: /* Define this if the nominal address of the stack frame
        !           679:    is at the high-address end of the local variables;
        !           680:    that is, each additional local variable allocated
        !           681:    goes at a more negative offset in the frame.
        !           682: 
        !           683:    On the RS/6000, we grow upwards, from the area after the outgoing
        !           684:    arguments.  */
        !           685: /* #define FRAME_GROWS_DOWNWARD */
        !           686: 
        !           687: /* Offset within stack frame to start allocating local variables at.
        !           688:    If FRAME_GROWS_DOWNWARD, this is the offset to the END of the
        !           689:    first local allocated.  Otherwise, it is the offset to the BEGINNING
        !           690:    of the first local allocated. 
        !           691: 
        !           692:    On the RS/6000, the frame pointer is the same as the stack pointer,
        !           693:    except for dynamic allocations.  So we start after the fixed area and
        !           694:    outgoing parameter area.  */
        !           695: 
        !           696: #define STARTING_FRAME_OFFSET (current_function_outgoing_args_size + 24)
        !           697: 
        !           698: /* If we generate an insn to push BYTES bytes,
        !           699:    this says how many the stack pointer really advances by.
        !           700:    On RS/6000, don't define this because there are no push insns.  */
        !           701: /*  #define PUSH_ROUNDING(BYTES) */
        !           702: 
        !           703: /* Offset of first parameter from the argument pointer register value.
        !           704:    On the RS/6000, we define the argument pointer to the start of the fixed
        !           705:    area.  */
        !           706: #define FIRST_PARM_OFFSET(FNDECL) 24
        !           707: 
        !           708: /* Define this if stack space is still allocated for a parameter passed
        !           709:    in a register.  The value is the number of bytes allocated to this
        !           710:    area.  */
        !           711: #define REG_PARM_STACK_SPACE(FNDECL)   32
        !           712: 
        !           713: /* Define this if the above stack space is to be considered part of the
        !           714:    space allocated by the caller.  */
        !           715: #define OUTGOING_REG_PARM_STACK_SPACE
        !           716: 
        !           717: /* This is the difference between the logical top of stack and the actual sp.
        !           718: 
        !           719:    For the RS/6000, sp points past the fixed area. */
        !           720: #define STACK_POINTER_OFFSET 24
        !           721: 
        !           722: /* Define this if the maximum size of all the outgoing args is to be
        !           723:    accumulated and pushed during the prologue.  The amount can be
        !           724:    found in the variable current_function_outgoing_args_size.  */
        !           725: #define ACCUMULATE_OUTGOING_ARGS
        !           726: 
        !           727: /* Value is the number of bytes of arguments automatically
        !           728:    popped when returning from a subroutine call.
        !           729:    FUNTYPE is the data type of the function (as a tree),
        !           730:    or for a library call it is an identifier node for the subroutine name.
        !           731:    SIZE is the number of bytes of arguments passed on the stack.  */
        !           732: 
        !           733: #define RETURN_POPS_ARGS(FUNTYPE,SIZE) 0
        !           734: 
        !           735: /* Define how to find the value returned by a function.
        !           736:    VALTYPE is the data type of the value (as a tree).
        !           737:    If the precise function being called is known, FUNC is its FUNCTION_DECL;
        !           738:    otherwise, FUNC is 0.
        !           739: 
        !           740:    On RS/6000 an integer value is in r3 and a floating-point value is in 
        !           741:    fp1.  */
        !           742: 
        !           743: #define FUNCTION_VALUE(VALTYPE, FUNC)  \
        !           744:   gen_rtx (REG, TYPE_MODE (VALTYPE),   \
        !           745:           TREE_CODE (VALTYPE) == REAL_TYPE ? 33 : 3)
        !           746: 
        !           747: /* Define how to find the value returned by a library function
        !           748:    assuming the value has mode MODE.  */
        !           749: 
        !           750: #define LIBCALL_VALUE(MODE)            \
        !           751:   gen_rtx (REG, MODE, GET_MODE_CLASS (MODE) == MODE_FLOAT ? 33 : 3)
        !           752: 
        !           753: /* The definition of this macro implies that there are cases where
        !           754:    a scalar value cannot be returned in registers.
        !           755: 
        !           756:    For the RS/6000, any structure or union type is returned in memory.  */
        !           757: 
        !           758: #define RETURN_IN_MEMORY(TYPE) \
        !           759:   (TYPE_MODE (TYPE) == BLKmode)
        !           760: 
        !           761: /* 1 if N is a possible register number for a function value
        !           762:    as seen by the caller.
        !           763: 
        !           764:    On RS/6000, this is r3 and fp1.  */
        !           765: 
        !           766: #define FUNCTION_VALUE_REGNO_P(N)  ((N) == 3 || ((N) == 33))
        !           767: 
        !           768: /* 1 if N is a possible register number for function argument passing.
        !           769:    On RS/6000, these are r3-r10 and fp1-fp13.  */
        !           770: 
        !           771: #define FUNCTION_ARG_REGNO_P(N)        \
        !           772:   (((N) <= 10 && (N) >= 3) || ((N) >= 33 && (N) <= 45))
        !           773: 
        !           774: /* Define a data type for recording info about an argument list
        !           775:    during the scan of that argument list.  This data type should
        !           776:    hold all necessary information about the function itself
        !           777:    and about the args processed so far, enough to enable macros
        !           778:    such as FUNCTION_ARG to determine where the next arg should go.
        !           779: 
        !           780:    On the RS/6000, this is a structure.  The first element is the number of
        !           781:    total argument words, the second is used to store the next
        !           782:    floating-point register number, and the third says how many more args we
        !           783:    have prototype types for.  */
        !           784: 
        !           785: struct rs6000_args {int words, fregno, nargs_prototype; };
        !           786: #define CUMULATIVE_ARGS struct rs6000_args
        !           787: 
        !           788: /* Define intermediate macro to compute the size (in registers) of an argument
        !           789:    for the RS/6000.  */
        !           790: 
        !           791: #define RS6000_ARG_SIZE(MODE, TYPE, NAMED)                             \
        !           792: (! (NAMED) ? 0                                                         \
        !           793:  : (MODE) != BLKmode                                                   \
        !           794:  ? (GET_MODE_SIZE (MODE) + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD      \
        !           795:  : (int_size_in_bytes (TYPE) + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD)
        !           796: 
        !           797: /* Initialize a variable CUM of type CUMULATIVE_ARGS
        !           798:    for a call to a function whose data type is FNTYPE.
        !           799:    For a library call, FNTYPE is 0.  */
        !           800: 
        !           801: #define INIT_CUMULATIVE_ARGS(CUM,FNTYPE,LIBNAME)       \
        !           802:   (CUM).words = 0,                             \
        !           803:   (CUM).fregno = 33,                           \
        !           804:   (CUM).nargs_prototype = (FNTYPE && TYPE_ARG_TYPES (FNTYPE)           \
        !           805:                           ? (list_length (TYPE_ARG_TYPES (FNTYPE)) - 1 \
        !           806:                              + (TYPE_MODE (TREE_TYPE (FNTYPE)) == BLKmode \
        !           807:                                 || RETURN_IN_MEMORY (TREE_TYPE (FNTYPE)))) \
        !           808:                           : 0)
        !           809: 
        !           810: /* Similar, but when scanning the definition of a procedure.  We always
        !           811:    set NARGS_PROTOTYPE large so we never return an EXPR_LIST.  */
        !           812: 
        !           813: #define INIT_CUMULATIVE_INCOMING_ARGS(CUM,FNTYPE,IGNORE) \
        !           814:   (CUM).words = 0,                             \
        !           815:   (CUM).fregno = 33,                           \
        !           816:   (CUM).nargs_prototype = 1000
        !           817: 
        !           818: /* Update the data in CUM to advance over an argument
        !           819:    of mode MODE and data type TYPE.
        !           820:    (TYPE is null for libcalls where that information may not be available.)  */
        !           821: 
        !           822: #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED)   \
        !           823: { (CUM).nargs_prototype--;                             \
        !           824:   if (NAMED)                                           \
        !           825:     {                                                  \
        !           826:       (CUM).words += RS6000_ARG_SIZE (MODE, TYPE, NAMED); \
        !           827:       if (GET_MODE_CLASS (MODE) == MODE_FLOAT)         \
        !           828:        (CUM).fregno++;                                 \
        !           829:     }                                                  \
        !           830: }
        !           831: 
        !           832: /* Non-zero if we can use a floating-point register to pass this arg.  */
        !           833: #define USE_FP_FOR_ARG_P(CUM,MODE,TYPE)        \
        !           834:   (GET_MODE_CLASS (MODE) == MODE_FLOAT && (CUM).fregno < 46)
        !           835: 
        !           836: /* Determine where to put an argument to a function.
        !           837:    Value is zero to push the argument on the stack,
        !           838:    or a hard register in which to store the argument.
        !           839: 
        !           840:    MODE is the argument's machine mode.
        !           841:    TYPE is the data type of the argument (as a tree).
        !           842:     This is null for libcalls where that information may
        !           843:     not be available.
        !           844:    CUM is a variable of type CUMULATIVE_ARGS which gives info about
        !           845:     the preceding args and about the function being called.
        !           846:    NAMED is nonzero if this argument is a named parameter
        !           847:     (otherwise it is an extra parameter matching an ellipsis).
        !           848: 
        !           849:    On RS/6000 the first eight words of non-FP are normally in registers
        !           850:    and the rest are pushed.  The first 13 FP args are in registers.
        !           851: 
        !           852:    If this is floating-point and no prototype is specified, we use
        !           853:    both an FP and integer register (or possibly FP reg and stack).  Library
        !           854:    functions (when TYPE is zero) always have the proper types for args,
        !           855:    so we can pass the FP value just in one register.  emit_library_function
        !           856:    doesn't support EXPR_LIST anyway.  */
        !           857: 
        !           858: #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED)                           \
        !           859:   (! (NAMED) ? 0                                                       \
        !           860:    : ((TYPE) != 0 && TREE_CODE (TYPE_SIZE (TYPE)) != INTEGER_CST) ? 0  \
        !           861:    : USE_FP_FOR_ARG_P (CUM, MODE, TYPE)                                        \
        !           862:    ? ((CUM).nargs_prototype > 0 || (TYPE) == 0                         \
        !           863:       ? gen_rtx (REG, MODE, (CUM).fregno)                              \
        !           864:       : ((CUM).words < 8                                               \
        !           865:         ? gen_rtx (EXPR_LIST, VOIDmode,                                \
        !           866:                    gen_rtx (REG, (MODE), 3 + (CUM).words),             \
        !           867:                    gen_rtx (REG, (MODE), (CUM).fregno))                \
        !           868:         : gen_rtx (EXPR_LIST, VOIDmode, 0,                             \
        !           869:                    gen_rtx (REG, (MODE), (CUM).fregno))))              \
        !           870:    : (CUM).words < 8 ? gen_rtx(REG, (MODE), 3 + (CUM).words) : 0)
        !           871: 
        !           872: /* For an arg passed partly in registers and partly in memory,
        !           873:    this is the number of registers used.
        !           874:    For args passed entirely in registers or entirely in memory, zero.  */
        !           875: 
        !           876: #define FUNCTION_ARG_PARTIAL_NREGS(CUM, MODE, TYPE, NAMED)             \
        !           877:   (! (NAMED) ? 0                                                       \
        !           878:    : USE_FP_FOR_ARG_P (CUM, MODE, TYPE) && (CUM).nargs_prototype >= 0 ? 0 \
        !           879:    : (((CUM).words < 8                                                 \
        !           880:        && 8 < ((CUM).words + RS6000_ARG_SIZE (MODE, TYPE, NAMED)))     \
        !           881:       ? 8 - (CUM).words : 0))
        !           882: 
        !           883: /* Perform any needed actions needed for a function that is receiving a
        !           884:    variable number of arguments. 
        !           885: 
        !           886:    CUM is as above.
        !           887: 
        !           888:    MODE and TYPE are the mode and type of the current parameter.
        !           889: 
        !           890:    PRETEND_SIZE is a variable that should be set to the amount of stack
        !           891:    that must be pushed by the prolog to pretend that our caller pushed
        !           892:    it.
        !           893: 
        !           894:    Normally, this macro will push all remaining incoming registers on the
        !           895:    stack and set PRETEND_SIZE to the length of the registers pushed.  */
        !           896: 
        !           897: #define SETUP_INCOMING_VARARGS(CUM,MODE,TYPE,PRETEND_SIZE,NO_RTL)      \
        !           898: { if ((CUM).words < 8)                                                 \
        !           899:     {                                                                  \
        !           900:       int first_reg_offset = (CUM).words;                              \
        !           901:                                                                        \
        !           902:       if (MUST_PASS_IN_STACK (MODE, TYPE))                             \
        !           903:        first_reg_offset += RS6000_ARG_SIZE (TYPE_MODE (TYPE), TYPE, 1); \
        !           904:                                                                        \
        !           905:       if (first_reg_offset > 8)                                                \
        !           906:        first_reg_offset = 8;                                           \
        !           907:                                                                        \
        !           908:       if (! (NO_RTL) && first_reg_offset != 8)                         \
        !           909:        move_block_from_reg                                             \
        !           910:          (3 + first_reg_offset,                                        \
        !           911:           gen_rtx (MEM, BLKmode,                                       \
        !           912:                    plus_constant (virtual_incoming_args_rtx,           \
        !           913:                                   first_reg_offset * 4)),              \
        !           914:           8 - first_reg_offset, (8 - first_reg_offset) * UNITS_PER_WORD); \
        !           915:       PRETEND_SIZE = (8 - first_reg_offset) * UNITS_PER_WORD;          \
        !           916:     }                                                                  \
        !           917: }
        !           918: 
        !           919: /* This macro generates the assembly code for function entry.
        !           920:    FILE is a stdio stream to output the code to.
        !           921:    SIZE is an int: how many units of temporary storage to allocate.
        !           922:    Refer to the array `regs_ever_live' to determine which registers
        !           923:    to save; `regs_ever_live[I]' is nonzero if register number I
        !           924:    is ever used in the function.  This macro is responsible for
        !           925:    knowing which registers should not be saved even if used.  */
        !           926: 
        !           927: #define FUNCTION_PROLOGUE(FILE, SIZE) output_prolog (FILE, SIZE)
        !           928: 
        !           929: /* Output assembler code to FILE to increment profiler label # LABELNO
        !           930:    for profiling a function entry.  */
        !           931: 
        !           932: #define FUNCTION_PROFILER(FILE, LABELNO)       \
        !           933:   output_function_profiler ((FILE), (LABELNO));
        !           934: 
        !           935: /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
        !           936:    the stack pointer does not matter. No definition is equivalent to
        !           937:    always zero.
        !           938: 
        !           939:    On the RS/6000, this is non-zero because we can restore the stack from
        !           940:    its backpointer, which we maintain.  */
        !           941: #define EXIT_IGNORE_STACK      1
        !           942: 
        !           943: /* This macro generates the assembly code for function exit,
        !           944:    on machines that need it.  If FUNCTION_EPILOGUE is not defined
        !           945:    then individual return instructions are generated for each
        !           946:    return statement.  Args are same as for FUNCTION_PROLOGUE.
        !           947: 
        !           948:    The function epilogue should not depend on the current stack pointer!
        !           949:    It should use the frame pointer only.  This is mandatory because
        !           950:    of alloca; we also take advantage of it to omit stack adjustments
        !           951:    before returning.  */
        !           952: 
        !           953: #define FUNCTION_EPILOGUE(FILE, SIZE) output_epilog (FILE, SIZE)
        !           954: 
        !           955: /* Output assembler code for a block containing the constant parts
        !           956:    of a trampoline, leaving space for the variable parts.
        !           957: 
        !           958:    The trampoline should set the static chain pointer to value placed
        !           959:    into the trampoline and should branch to the specified routine.
        !           960: 
        !           961:    On the RS/6000, this is not code at all, but merely a data area,
        !           962:    since that is the way all functions are called.  The first word is
        !           963:    the address of the function, the second word is the TOC pointer (r2),
        !           964:    and the third word is the static chain value.  */
        !           965: 
        !           966: #define TRAMPOLINE_TEMPLATE(FILE) { fprintf (FILE, "\t.long 0, 0, 0\n"); }
        !           967: 
        !           968: /* Length in units of the trampoline for entering a nested function.  */
        !           969: 
        !           970: #define TRAMPOLINE_SIZE    12
        !           971: 
        !           972: /* Emit RTL insns to initialize the variable parts of a trampoline.
        !           973:    FNADDR is an RTX for the address of the function's pure code.
        !           974:    CXT is an RTX for the static chain value for the function.  */
        !           975: 
        !           976: #define INITIALIZE_TRAMPOLINE(ADDR, FNADDR, CXT)               \
        !           977: {                                                              \
        !           978:   emit_move_insn (gen_rtx (MEM, SImode,                                \
        !           979:                           memory_address (SImode, (ADDR))),    \
        !           980:                  gen_rtx (MEM, SImode,                         \
        !           981:                           memory_address (SImode, (FNADDR)))); \
        !           982:   emit_move_insn (gen_rtx (MEM, SImode,                                \
        !           983:                           memory_address (SImode,              \
        !           984:                                           plus_constant ((ADDR), 4))), \
        !           985:                  gen_rtx (MEM, SImode,                         \
        !           986:                           memory_address (SImode,              \
        !           987:                                           plus_constant ((FNADDR), 4)))); \
        !           988:   emit_move_insn (gen_rtx (MEM, SImode,                                \
        !           989:                           memory_address (SImode,              \
        !           990:                                           plus_constant ((ADDR), 8))), \
        !           991:                  force_reg (SImode, (CXT)));                   \
        !           992: }
        !           993: 
        !           994: /* Definitions for register eliminations.
        !           995: 
        !           996:    We have two registers that can be eliminated on the RS/6000.  First, the
        !           997:    frame pointer register can often be eliminated in favor of the stack
        !           998:    pointer register.  Secondly, the argument pointer register can always be
        !           999:    eliminated; it is replaced with either the stack or frame pointer.
        !          1000: 
        !          1001:    In addition, we use the elimination mechanism to see if r30 is needed
        !          1002:    Initially we assume that it isn't.  If it is, we spill it.  This is done
        !          1003:    by making it an eliminable register.  We replace it with itself so that
        !          1004:    if it isn't needed, then existing uses won't be modified.  */
        !          1005: 
        !          1006: /* This is an array of structures.  Each structure initializes one pair
        !          1007:    of eliminable registers.  The "from" register number is given first,
        !          1008:    followed by "to".  Eliminations of the same "from" register are listed
        !          1009:    in order of preference.  */
        !          1010: #define ELIMINABLE_REGS                                \
        !          1011: {{ FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM},        \
        !          1012:  { ARG_POINTER_REGNUM, STACK_POINTER_REGNUM},  \
        !          1013:  { ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM},  \
        !          1014:  { 30, 30} }
        !          1015: 
        !          1016: /* Given FROM and TO register numbers, say whether this elimination is allowed.
        !          1017:    Frame pointer elimination is automatically handled.
        !          1018: 
        !          1019:    For the RS/6000, if frame pointer elimination is being done, we would like
        !          1020:    to convert ap into fp, not sp.
        !          1021: 
        !          1022:    We need r30 if -mmininal-toc was specified, and there are constant pool
        !          1023:    references.  */
        !          1024: 
        !          1025: #define CAN_ELIMINATE(FROM, TO)                                        \
        !          1026:  ((FROM) == ARG_POINTER_REGNUM && (TO) == STACK_POINTER_REGNUM \
        !          1027:   ? ! frame_pointer_needed                                     \
        !          1028:   : (FROM) == 30 ? ! TARGET_MINIMAL_TOC || get_pool_size () == 0 \
        !          1029:   : 1)
        !          1030: 
        !          1031: /* Define the offset between two registers, one to be eliminated, and the other
        !          1032:    its replacement, at the start of a routine.  */
        !          1033: #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET)                   \
        !          1034: {                                                                      \
        !          1035:   int total_stack_size = (rs6000_sa_size () + get_frame_size ()                \
        !          1036:                          + current_function_outgoing_args_size);       \
        !          1037:                                                                        \
        !          1038:   total_stack_size = (total_stack_size + 7) & ~7;                      \
        !          1039:                                                                        \
        !          1040:  if ((FROM) == FRAME_POINTER_REGNUM && (TO) == STACK_POINTER_REGNUM)   \
        !          1041:     {                                                                  \
        !          1042:       if (rs6000_pushes_stack ())                                      \
        !          1043:        (OFFSET) = 0;                                                   \
        !          1044:       else                                                             \
        !          1045:        (OFFSET) = - total_stack_size;                                  \
        !          1046:     }                                                                  \
        !          1047:   else if ((FROM) == ARG_POINTER_REGNUM && (TO) == FRAME_POINTER_REGNUM) \
        !          1048:       (OFFSET) = total_stack_size;                                     \
        !          1049:   else if ((FROM) == ARG_POINTER_REGNUM && (TO) == STACK_POINTER_REGNUM) \
        !          1050:     {                                                                  \
        !          1051:       if (rs6000_pushes_stack ())                                      \
        !          1052:        (OFFSET) = total_stack_size;                                    \
        !          1053:       else                                                             \
        !          1054:        (OFFSET) = 0;                                                   \
        !          1055:     }                                                                  \
        !          1056:   else if ((FROM) == 30)                                               \
        !          1057:     (OFFSET) = 0;                                                      \
        !          1058:   else                                                                 \
        !          1059:     abort ();                                                          \
        !          1060: }
        !          1061: 
        !          1062: /* Addressing modes, and classification of registers for them.  */
        !          1063: 
        !          1064: /* #define HAVE_POST_INCREMENT */
        !          1065: /* #define HAVE_POST_DECREMENT */
        !          1066: 
        !          1067: #define HAVE_PRE_DECREMENT
        !          1068: #define HAVE_PRE_INCREMENT
        !          1069: 
        !          1070: /* Macros to check register numbers against specific register classes.  */
        !          1071: 
        !          1072: /* These assume that REGNO is a hard or pseudo reg number.
        !          1073:    They give nonzero only if REGNO is a hard reg of the suitable class
        !          1074:    or a pseudo reg currently allocated to a suitable hard reg.
        !          1075:    Since they use reg_renumber, they are safe only once reg_renumber
        !          1076:    has been allocated, which happens in local-alloc.c.  */
        !          1077: 
        !          1078: #define REGNO_OK_FOR_INDEX_P(REGNO)                            \
        !          1079: ((REGNO) < FIRST_PSEUDO_REGISTER                               \
        !          1080:  ? (REGNO) <= 31 || (REGNO) == 67                              \
        !          1081:  : (reg_renumber[REGNO] >= 0                                   \
        !          1082:     && (reg_renumber[REGNO] <= 31 || reg_renumber[REGNO] == 67)))
        !          1083: 
        !          1084: #define REGNO_OK_FOR_BASE_P(REGNO)                             \
        !          1085: ((REGNO) < FIRST_PSEUDO_REGISTER                               \
        !          1086:  ? ((REGNO) > 0 && (REGNO) <= 31) || (REGNO) == 67             \
        !          1087:  : (reg_renumber[REGNO] > 0                                    \
        !          1088:     && (reg_renumber[REGNO] <= 31 || reg_renumber[REGNO] == 67)))
        !          1089: 
        !          1090: /* Maximum number of registers that can appear in a valid memory address.  */
        !          1091: 
        !          1092: #define MAX_REGS_PER_ADDRESS 2
        !          1093: 
        !          1094: /* Recognize any constant value that is a valid address.  */
        !          1095: 
        !          1096: #define CONSTANT_ADDRESS_P(X)   \
        !          1097:   (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF             \
        !          1098:    || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST               \
        !          1099:    || GET_CODE (X) == HIGH)
        !          1100: 
        !          1101: /* Nonzero if the constant value X is a legitimate general operand.
        !          1102:    It is given that X satisfies CONSTANT_P or is a CONST_DOUBLE.
        !          1103: 
        !          1104:    On the RS/6000, all integer constants are acceptable, most won't be valid
        !          1105:    for particular insns, though.  Only easy FP constants are
        !          1106:    acceptable.  */
        !          1107: 
        !          1108: #define LEGITIMATE_CONSTANT_P(X)                               \
        !          1109:   (GET_CODE (X) != CONST_DOUBLE || GET_MODE (X) == VOIDmode    \
        !          1110:    || easy_fp_constant (X, GET_MODE (X)))
        !          1111: 
        !          1112: /* The macros REG_OK_FOR..._P assume that the arg is a REG rtx
        !          1113:    and check its validity for a certain class.
        !          1114:    We have two alternate definitions for each of them.
        !          1115:    The usual definition accepts all pseudo regs; the other rejects
        !          1116:    them unless they have been allocated suitable hard regs.
        !          1117:    The symbol REG_OK_STRICT causes the latter definition to be used.
        !          1118: 
        !          1119:    Most source files want to accept pseudo regs in the hope that
        !          1120:    they will get allocated to the class that the insn wants them to be in.
        !          1121:    Source files for reload pass need to be strict.
        !          1122:    After reload, it makes no difference, since pseudo regs have
        !          1123:    been eliminated by then.  */
        !          1124: 
        !          1125: #ifndef REG_OK_STRICT
        !          1126: 
        !          1127: /* Nonzero if X is a hard reg that can be used as an index
        !          1128:    or if it is a pseudo reg.  */
        !          1129: #define REG_OK_FOR_INDEX_P(X)                  \
        !          1130:   (REGNO (X) <= 31 || REGNO (X) == 67 || REGNO (X) >= FIRST_PSEUDO_REGISTER)
        !          1131: 
        !          1132: /* Nonzero if X is a hard reg that can be used as a base reg
        !          1133:    or if it is a pseudo reg.  */
        !          1134: #define REG_OK_FOR_BASE_P(X)                                    \
        !          1135:   (REGNO (X) > 0 && REG_OK_FOR_INDEX_P (X))
        !          1136: 
        !          1137: #else
        !          1138: 
        !          1139: /* Nonzero if X is a hard reg that can be used as an index.  */
        !          1140: #define REG_OK_FOR_INDEX_P(X) REGNO_OK_FOR_INDEX_P (REGNO (X))
        !          1141: /* Nonzero if X is a hard reg that can be used as a base reg.  */
        !          1142: #define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
        !          1143: 
        !          1144: #endif
        !          1145: 
        !          1146: /* GO_IF_LEGITIMATE_ADDRESS recognizes an RTL expression
        !          1147:    that is a valid memory address for an instruction.
        !          1148:    The MODE argument is the machine mode for the MEM expression
        !          1149:    that wants to use this address.
        !          1150: 
        !          1151:    On the RS/6000, there are four valid address: a SYMBOL_REF that
        !          1152:    refers to a constant pool entry of an address (or the sum of it
        !          1153:    plus a constant), a short (16-bit signed) constant plus a register,
        !          1154:    the sum of two registers, or a register indirect, possibly with an
        !          1155:    auto-increment.  For DFmode and DImode with an constant plus register,
        !          1156:    we must ensure that both words are addressable.  */
        !          1157: 
        !          1158: #define LEGITIMATE_CONSTANT_POOL_BASE_P(X)                             \
        !          1159:   (GET_CODE (X) == SYMBOL_REF && CONSTANT_POOL_ADDRESS_P (X)           \
        !          1160:    && ASM_OUTPUT_SPECIAL_POOL_ENTRY_P (get_pool_constant (X)))
        !          1161: 
        !          1162: #define LEGITIMATE_CONSTANT_POOL_ADDRESS_P(X)                          \
        !          1163:   (LEGITIMATE_CONSTANT_POOL_BASE_P (X)                                 \
        !          1164:    || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS         \
        !          1165:        && GET_CODE (XEXP (XEXP (X, 0), 1)) == CONST_INT                        \
        !          1166:        && LEGITIMATE_CONSTANT_POOL_BASE_P (XEXP (XEXP (X, 0), 0))))
        !          1167: 
        !          1168: #define LEGITIMATE_ADDRESS_INTEGER_P(X,OFFSET)                         \
        !          1169:  (GET_CODE (X) == CONST_INT                                            \
        !          1170:   && (unsigned) (INTVAL (X) + (OFFSET) + 0x8000) < 0x10000)
        !          1171: 
        !          1172: #define LEGITIMATE_OFFSET_ADDRESS_P(MODE,X)            \
        !          1173:  (GET_CODE (X) == PLUS                                 \
        !          1174:   && GET_CODE (XEXP (X, 0)) == REG                     \
        !          1175:   && REG_OK_FOR_BASE_P (XEXP (X, 0))                   \
        !          1176:   && LEGITIMATE_ADDRESS_INTEGER_P (XEXP (X, 1), 0)     \
        !          1177:   && (((MODE) != DFmode && (MODE) != DImode)           \
        !          1178:       || LEGITIMATE_ADDRESS_INTEGER_P (XEXP (X, 1), 4)))
        !          1179: 
        !          1180: #define LEGITIMATE_INDEXED_ADDRESS_P(X)                \
        !          1181:  (GET_CODE (X) == PLUS                         \
        !          1182:   && GET_CODE (XEXP (X, 0)) == REG             \
        !          1183:   && GET_CODE (XEXP (X, 1)) == REG             \
        !          1184:   && ((REG_OK_FOR_BASE_P (XEXP (X, 0))         \
        !          1185:        && REG_OK_FOR_INDEX_P (XEXP (X, 1)))    \
        !          1186:       || (REG_OK_FOR_BASE_P (XEXP (X, 1))      \
        !          1187:          && REG_OK_FOR_INDEX_P (XEXP (X, 0)))))
        !          1188: 
        !          1189: #define LEGITIMATE_INDIRECT_ADDRESS_P(X)       \
        !          1190:   (GET_CODE (X) == REG && REG_OK_FOR_BASE_P (X))
        !          1191: 
        !          1192: #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, ADDR)                \
        !          1193: { if (LEGITIMATE_INDIRECT_ADDRESS_P (X))               \
        !          1194:     goto ADDR;                                         \
        !          1195:   if (GET_CODE (X) == PRE_INC                          \
        !          1196:       && LEGITIMATE_INDIRECT_ADDRESS_P (XEXP (X, 0)))  \
        !          1197:     goto ADDR;                                         \
        !          1198:   if (GET_CODE (X) == PRE_DEC                          \
        !          1199:       && LEGITIMATE_INDIRECT_ADDRESS_P (XEXP (X, 0)))  \
        !          1200:     goto ADDR;                                         \
        !          1201:   if (LEGITIMATE_CONSTANT_POOL_ADDRESS_P (X))          \
        !          1202:     goto ADDR;                                         \
        !          1203:   if (LEGITIMATE_OFFSET_ADDRESS_P (MODE, X))           \
        !          1204:     goto ADDR;                                         \
        !          1205:   if ((MODE) != DImode && (MODE) != TImode             \
        !          1206:       && LEGITIMATE_INDEXED_ADDRESS_P (X))             \
        !          1207:     goto ADDR;                                         \
        !          1208: }
        !          1209: 
        !          1210: /* Try machine-dependent ways of modifying an illegitimate address
        !          1211:    to be legitimate.  If we find one, return the new, valid address.
        !          1212:    This macro is used in only one place: `memory_address' in explow.c.
        !          1213: 
        !          1214:    OLDX is the address as it was before break_out_memory_refs was called.
        !          1215:    In some cases it is useful to look at this to decide what needs to be done.
        !          1216: 
        !          1217:    MODE and WIN are passed so that this macro can use
        !          1218:    GO_IF_LEGITIMATE_ADDRESS.
        !          1219: 
        !          1220:    It is always safe for this macro to do nothing.  It exists to recognize
        !          1221:    opportunities to optimize the output.
        !          1222: 
        !          1223:    On RS/6000, first check for the sum of a register with a constant
        !          1224:    integer that is out of range.  If so, generate code to add the
        !          1225:    constant with the low-order 16 bits masked to the register and force
        !          1226:    this result into another register (this can be done with `cau').
        !          1227:    Then generate an address of REG+(CONST&0xffff), allowing for the 
        !          1228:    possibility of bit 16 being a one.
        !          1229: 
        !          1230:    Then check for the sum of a register and something not constant, try to
        !          1231:    load the other things into a register and return the sum.  */
        !          1232: 
        !          1233: #define LEGITIMIZE_ADDRESS(X,OLDX,MODE,WIN)                    \
        !          1234: { if (GET_CODE (X) == PLUS && GET_CODE (XEXP (X, 0)) == REG    \
        !          1235:     && GET_CODE (XEXP (X, 1)) == CONST_INT                     \
        !          1236:     && (unsigned) (INTVAL (XEXP (X, 1)) + 0x8000) >= 0x10000)  \
        !          1237:     { int high_int, low_int;                                   \
        !          1238:       high_int = INTVAL (XEXP (X, 1)) >> 16;                   \
        !          1239:       low_int = INTVAL (XEXP (X, 1)) & 0xffff;                 \
        !          1240:       if (low_int & 0x8000)                                    \
        !          1241:        high_int += 1, low_int |= 0xffff0000;                   \
        !          1242:       (X) = gen_rtx (PLUS, SImode,                             \
        !          1243:                     force_operand                              \
        !          1244:                        (gen_rtx (PLUS, SImode, XEXP (X, 0), \
        !          1245:                                  gen_rtx (CONST_INT, VOIDmode, \
        !          1246:                                                      high_int << 16)), 0),\
        !          1247:                     gen_rtx (CONST_INT, VOIDmode, low_int));   \
        !          1248:       goto WIN;                                                        \
        !          1249:     }                                                          \
        !          1250:   else if (GET_CODE (X) == PLUS && GET_CODE (XEXP (X, 0)) == REG \
        !          1251:           && GET_CODE (XEXP (X, 1)) != CONST_INT               \
        !          1252:           && (MODE) != DImode && (MODE) != TImode)             \
        !          1253:     {                                                          \
        !          1254:       (X) = gen_rtx (PLUS, SImode, XEXP (X, 0),                        \
        !          1255:                     force_reg (SImode, force_operand (XEXP (X, 1), 0))); \
        !          1256:       goto WIN;                                                        \
        !          1257:     }                                                          \
        !          1258: }
        !          1259: 
        !          1260: /* Go to LABEL if ADDR (a legitimate address expression)
        !          1261:    has an effect that depends on the machine mode it is used for.
        !          1262: 
        !          1263:    On the RS/6000 this is true if the address is valid with a zero offset
        !          1264:    but not with an offset of four (this means it cannot be used as an
        !          1265:    address for DImode or DFmode) or is a pre-increment or decrement.  Since
        !          1266:    we know it is valid, we just check for an address that is not valid with
        !          1267:    an offset of four.  */
        !          1268: 
        !          1269: #define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR,LABEL)               \
        !          1270: { if (GET_CODE (ADDR) == PLUS                                  \
        !          1271:       && LEGITIMATE_ADDRESS_INTEGER_P (XEXP (ADDR, 1), 0)      \
        !          1272:       && ! LEGITIMATE_ADDRESS_INTEGER_P (XEXP (ADDR, 1), 4))   \
        !          1273:     goto LABEL;                                                        \
        !          1274:   if (GET_CODE (ADDR) == PRE_INC)                              \
        !          1275:     goto LABEL;                                                        \
        !          1276:   if (GET_CODE (ADDR) == PRE_DEC)                              \
        !          1277:     goto LABEL;                                                        \
        !          1278: }
        !          1279: 
        !          1280: /* Define this if some processing needs to be done immediately before
        !          1281:    emitting code for an insn. */
        !          1282: 
        !          1283: /* #define FINAL_PRESCAN_INSN(INSN,OPERANDS,NOPERANDS) */
        !          1284: 
        !          1285: /* Specify the machine mode that this machine uses
        !          1286:    for the index in the tablejump instruction.  */
        !          1287: #define CASE_VECTOR_MODE SImode
        !          1288: 
        !          1289: /* Define this if the tablejump instruction expects the table
        !          1290:    to contain offsets from the address of the table.
        !          1291:    Do not define this if the table should contain absolute addresses.  */
        !          1292: #define CASE_VECTOR_PC_RELATIVE
        !          1293: 
        !          1294: /* Specify the tree operation to be used to convert reals to integers.  */
        !          1295: #define IMPLICIT_FIX_EXPR FIX_ROUND_EXPR
        !          1296: 
        !          1297: /* This is the kind of divide that is easiest to do in the general case.  */
        !          1298: #define EASY_DIV_EXPR TRUNC_DIV_EXPR
        !          1299: 
        !          1300: /* Define this as 1 if `char' should by default be signed; else as 0.  */
        !          1301: #define DEFAULT_SIGNED_CHAR 0
        !          1302: 
        !          1303: /* This flag, if defined, says the same insns that convert to a signed fixnum
        !          1304:    also convert validly to an unsigned one.  */
        !          1305: 
        !          1306: /* #define FIXUNS_TRUNC_LIKE_FIX_TRUNC */
        !          1307: 
        !          1308: /* Max number of bytes we can move from memory to memory
        !          1309:    in one reasonably fast instruction.  */
        !          1310: #define MOVE_MAX 16
        !          1311: 
        !          1312: /* Nonzero if access to memory by bytes is no faster than for words.
        !          1313:    Also non-zero if doing byte operations (specifically shifts) in registers
        !          1314:    is undesirable.  */
        !          1315: #define SLOW_BYTE_ACCESS 1
        !          1316: 
        !          1317: /* Define if operations between registers always perform the operation
        !          1318:    on the full register even if a narrower mode is specified.  */
        !          1319: #define WORD_REGISTER_OPERATIONS
        !          1320: 
        !          1321: /* Define if loading in MODE, an integral mode narrower than BITS_PER_WORD
        !          1322:    will either zero-extend or sign-extend.  The value of this macro should
        !          1323:    be the code that says which one of the two operations is implicitly
        !          1324:    done, NIL if none.  */
        !          1325: #define LOAD_EXTEND_OP(MODE) ZERO_EXTEND
        !          1326: 
        !          1327: /* Define if loading short immediate values into registers sign extends.  */
        !          1328: #define SHORT_IMMEDIATES_SIGN_EXTEND
        !          1329: 
        !          1330: /* The RS/6000 uses the XCOFF format.  */
        !          1331: 
        !          1332: #define XCOFF_DEBUGGING_INFO
        !          1333: 
        !          1334: /* Define if the object format being used is COFF or a superset.  */
        !          1335: #define OBJECT_FORMAT_COFF
        !          1336: 
        !          1337: /* Define the magic numbers that we recognize as COFF.  */
        !          1338: 
        !          1339: #define MY_ISCOFF(magic) \
        !          1340:   ((magic) == U802WRMAGIC || (magic) == U802ROMAGIC || (magic) == U802TOCMAGIC)
        !          1341: 
        !          1342: /* This is the only version of nm that collect2 can work with.  */
        !          1343: #define REAL_NM_FILE_NAME "/usr/ucb/nm"
        !          1344: 
        !          1345: /* We don't have GAS for the RS/6000 yet, so don't write out special
        !          1346:    .stabs in cc1plus.  */
        !          1347:    
        !          1348: #define FASCIST_ASSEMBLER
        !          1349: 
        !          1350: /* Value is 1 if truncating an integer of INPREC bits to OUTPREC bits
        !          1351:    is done just by pretending it is already truncated.  */
        !          1352: #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
        !          1353: 
        !          1354: /* Specify the machine mode that pointers have.
        !          1355:    After generation of rtl, the compiler makes no further distinction
        !          1356:    between pointers and any other objects of this machine mode.  */
        !          1357: #define Pmode SImode
        !          1358: 
        !          1359: /* Mode of a function address in a call instruction (for indexing purposes).
        !          1360: 
        !          1361:    Doesn't matter on RS/6000.  */
        !          1362: #define FUNCTION_MODE SImode
        !          1363: 
        !          1364: /* Define this if addresses of constant functions
        !          1365:    shouldn't be put through pseudo regs where they can be cse'd.
        !          1366:    Desirable on machines where ordinary constants are expensive
        !          1367:    but a CALL with constant address is cheap.  */
        !          1368: #define NO_FUNCTION_CSE
        !          1369: 
        !          1370: /* Define this to be nonzero if shift instructions ignore all but the low-order
        !          1371:    few bits.
        !          1372: 
        !          1373:    The sle and sre instructions which allow SHIFT_COUNT_TRUNCATED
        !          1374:    have been dropped from the PowerPC architecture.  */
        !          1375: 
        !          1376: #define SHIFT_COUNT_TRUNCATED TARGET_POWER ? 1 : 0
        !          1377: 
        !          1378: /* Use atexit for static constructors/destructors, instead of defining
        !          1379:    our own exit function.  */
        !          1380: #define HAVE_ATEXIT
        !          1381: 
        !          1382: /* Compute the cost of computing a constant rtl expression RTX
        !          1383:    whose rtx-code is CODE.  The body of this macro is a portion
        !          1384:    of a switch statement.  If the code is computed here,
        !          1385:    return it with a return statement.  Otherwise, break from the switch.
        !          1386: 
        !          1387:    On the RS/6000, if it is legal in the insn, it is free.  So this
        !          1388:    always returns 0.  */
        !          1389: 
        !          1390: #define CONST_COSTS(RTX,CODE,OUTER_CODE) \
        !          1391:   case CONST_INT:                                              \
        !          1392:   case CONST:                                                  \
        !          1393:   case LABEL_REF:                                              \
        !          1394:   case SYMBOL_REF:                                             \
        !          1395:   case CONST_DOUBLE:                                           \
        !          1396:     return 0;
        !          1397: 
        !          1398: /* Provide the costs of a rtl expression.  This is in the body of a
        !          1399:    switch on CODE.  */
        !          1400: 
        !          1401: #define RTX_COSTS(X,CODE,OUTER_CODE)                   \
        !          1402:   case MULT:                                           \
        !          1403:     return (GET_CODE (XEXP (X, 1)) != CONST_INT                \
        !          1404:            ? COSTS_N_INSNS (5)                         \
        !          1405:            : INTVAL (XEXP (X, 1)) >= -256 && INTVAL (XEXP (X, 1)) <= 255 \
        !          1406:            ? COSTS_N_INSNS (3) : COSTS_N_INSNS (4));   \
        !          1407:   case DIV:                                            \
        !          1408:   case MOD:                                            \
        !          1409:     if (GET_CODE (XEXP (X, 1)) == CONST_INT            \
        !          1410:        && exact_log2 (INTVAL (XEXP (X, 1))) >= 0)      \
        !          1411:       return COSTS_N_INSNS (2);                                \
        !          1412:     /* otherwise fall through to normal divide.  */    \
        !          1413:   case UDIV:                                           \
        !          1414:   case UMOD:                                           \
        !          1415:     return COSTS_N_INSNS (19);                         \
        !          1416:   case MEM:                                            \
        !          1417:     /* MEM should be slightly more expensive than (plus (reg) (const)) */ \
        !          1418:     return 5;
        !          1419: 
        !          1420: /* Compute the cost of an address.  This is meant to approximate the size
        !          1421:    and/or execution delay of an insn using that address.  If the cost is
        !          1422:    approximated by the RTL complexity, including CONST_COSTS above, as
        !          1423:    is usually the case for CISC machines, this macro should not be defined.
        !          1424:    For aggressively RISCy machines, only one insn format is allowed, so
        !          1425:    this macro should be a constant.  The value of this macro only matters
        !          1426:    for valid addresses.
        !          1427: 
        !          1428:    For the RS/6000, everything is cost 0.  */
        !          1429: 
        !          1430: #define ADDRESS_COST(RTX) 0
        !          1431: 
        !          1432: /* Adjust the length of an INSN.  LENGTH is the currently-computed length and
        !          1433:    should be adjusted to reflect any required changes.  This macro is used when
        !          1434:    there is some systematic length adjustment required that would be difficult
        !          1435:    to express in the length attribute.  */
        !          1436: 
        !          1437: /* #define ADJUST_INSN_LENGTH(X,LENGTH) */
        !          1438: 
        !          1439: /* Add any extra modes needed to represent the condition code.
        !          1440: 
        !          1441:    For the RS/6000, we need separate modes when unsigned (logical) comparisons
        !          1442:    are being done and we need a separate mode for floating-point.  We also
        !          1443:    use a mode for the case when we are comparing the results of two
        !          1444:    comparisons.  */
        !          1445: 
        !          1446: #define EXTRA_CC_MODES CCUNSmode, CCFPmode, CCEQmode
        !          1447: 
        !          1448: /* Define the names for the modes specified above.  */
        !          1449: #define EXTRA_CC_NAMES "CCUNS", "CCFP", "CCEQ"
        !          1450: 
        !          1451: /* Given a comparison code (EQ, NE, etc.) and the first operand of a COMPARE,
        !          1452:    return the mode to be used for the comparison.  For floating-point, CCFPmode
        !          1453:    should be used.  CCUNSmode should be used for unsigned comparisons.
        !          1454:    CCEQmode should be used when we are doing an inequality comparison on
        !          1455:    the result of a comparison. CCmode should be used in all other cases.  */
        !          1456: 
        !          1457: #define SELECT_CC_MODE(OP,X,Y) \
        !          1458:   (GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT ? CCFPmode      \
        !          1459:    : (OP) == GTU || (OP) == LTU || (OP) == GEU || (OP) == LEU ? CCUNSmode \
        !          1460:    : (((OP) == EQ || (OP) == NE) && GET_RTX_CLASS (GET_CODE (X)) == '<'   \
        !          1461:       ? CCEQmode : CCmode))
        !          1462: 
        !          1463: /* Define the information needed to generate branch and scc insns.  This is
        !          1464:    stored from the compare operation.  Note that we can't use "rtx" here
        !          1465:    since it hasn't been defined!  */
        !          1466: 
        !          1467: extern struct rtx_def *rs6000_compare_op0, *rs6000_compare_op1;
        !          1468: extern int rs6000_compare_fp_p;
        !          1469: 
        !          1470: /* Set to non-zero by "fix" operation to indicate that itrunc and
        !          1471:    uitrunc must be defined.  */
        !          1472: 
        !          1473: extern int rs6000_trunc_used;
        !          1474: 
        !          1475: /* Control the assembler format that we output.  */
        !          1476: 
        !          1477: /* Output at beginning of assembler file.
        !          1478: 
        !          1479:    Initialize the section names for the RS/6000 at this point.
        !          1480: 
        !          1481:    Specify filename to assembler.
        !          1482: 
        !          1483:    We want to go into the TOC section so at least one .toc will be emitted.
        !          1484:    Also, in order to output proper .bs/.es pairs, we need at least one static
        !          1485:    [RW] section emitted.
        !          1486: 
        !          1487:    We then switch back to text to force the gcc2_compiled. label and the space
        !          1488:    allocated after it (when profiling) into the text section.  
        !          1489: 
        !          1490:    Finally, declare mcount when profiling to make the assembler happy.  */
        !          1491: 
        !          1492: #define ASM_FILE_START(FILE)                                   \
        !          1493: {                                                              \
        !          1494:   rs6000_gen_section_name (&xcoff_bss_section_name,            \
        !          1495:                           main_input_filename, ".bss_");       \
        !          1496:   rs6000_gen_section_name (&xcoff_private_data_section_name,   \
        !          1497:                           main_input_filename, ".rw_");        \
        !          1498:   rs6000_gen_section_name (&xcoff_read_only_section_name,      \
        !          1499:                           main_input_filename, ".ro_");        \
        !          1500:                                                                \
        !          1501:   output_file_directive (FILE, main_input_filename);           \
        !          1502:   toc_section ();                                              \
        !          1503:   if (write_symbols != NO_DEBUG)                               \
        !          1504:     private_data_section ();                                   \
        !          1505:   text_section ();                                             \
        !          1506:   if (profile_flag)                                            \
        !          1507:     fprintf (FILE, "\t.extern .mcount\n");                     \
        !          1508: }
        !          1509: 
        !          1510: /* Output at end of assembler file.
        !          1511: 
        !          1512:    On the RS/6000, referencing data should automatically pull in text.  */
        !          1513: 
        !          1514: #define ASM_FILE_END(FILE)                                     \
        !          1515: {                                                              \
        !          1516:   text_section ();                                             \
        !          1517:   fprintf (FILE, "_section_.text:\n");                         \
        !          1518:   data_section ();                                             \
        !          1519:   fprintf (FILE, "\t.long _section_.text\n");                  \
        !          1520: }
        !          1521: 
        !          1522: /* We define this to prevent the name mangler from putting dollar signs into
        !          1523:    function names.  */
        !          1524: 
        !          1525: #define NO_DOLLAR_IN_LABEL
        !          1526: 
        !          1527: /* We define this to 0 so that gcc will never accept a dollar sign in a
        !          1528:    variable name.  This is needed because the AIX assembler will not accept
        !          1529:    dollar signs.  */
        !          1530: 
        !          1531: #define DOLLARS_IN_IDENTIFIERS 0
        !          1532: 
        !          1533: /* Implicit library calls should use memcpy, not bcopy, etc.  */
        !          1534: 
        !          1535: #define TARGET_MEM_FUNCTIONS
        !          1536: 
        !          1537: /* Define the extra sections we need.  We define three: one is the read-only
        !          1538:    data section which is used for constants.  This is a csect whose name is
        !          1539:    derived from the name of the input file.  The second is for initialized
        !          1540:    global variables.  This is a csect whose name is that of the variable.
        !          1541:    The third is the TOC.  */
        !          1542: 
        !          1543: #define EXTRA_SECTIONS \
        !          1544:    read_only_data, private_data, read_only_private_data, toc, bss
        !          1545: 
        !          1546: /* Define the name of our readonly data section.  */
        !          1547: 
        !          1548: #define READONLY_DATA_SECTION read_only_data_section
        !          1549: 
        !          1550: /* If we are referencing a function that is static or is known to be
        !          1551:    in this file, make the SYMBOL_REF special.  We can use this to indicate
        !          1552:    that we can branch to this function without emitting a no-op after the
        !          1553:    call.  */
        !          1554: 
        !          1555: #define ENCODE_SECTION_INFO(DECL)  \
        !          1556:   if (TREE_CODE (DECL) == FUNCTION_DECL                        \
        !          1557:       && (TREE_ASM_WRITTEN (DECL) || ! TREE_PUBLIC (DECL))) \
        !          1558:     SYMBOL_REF_FLAG (XEXP (DECL_RTL (DECL), 0)) = 1;
        !          1559: 
        !          1560: /* Indicate that jump tables go in the text section.  */
        !          1561: 
        !          1562: #define JUMP_TABLES_IN_TEXT_SECTION
        !          1563: 
        !          1564: /* Define the routines to implement these extra sections.  */
        !          1565: 
        !          1566: #define EXTRA_SECTION_FUNCTIONS                                \
        !          1567:                                                        \
        !          1568: void                                                   \
        !          1569: read_only_data_section ()                              \
        !          1570: {                                                      \
        !          1571:   if (in_section != read_only_data)                    \
        !          1572:     {                                                  \
        !          1573:       fprintf (asm_out_file, ".csect %s[RO]\n",                \
        !          1574:               xcoff_read_only_section_name);           \
        !          1575:       in_section = read_only_data;                     \
        !          1576:     }                                                  \
        !          1577: }                                                      \
        !          1578:                                                        \
        !          1579: void                                                   \
        !          1580: private_data_section ()                                        \
        !          1581: {                                                      \
        !          1582:   if (in_section != private_data)                      \
        !          1583:     {                                                  \
        !          1584:       fprintf (asm_out_file, ".csect %s[RW]\n",                \
        !          1585:               xcoff_private_data_section_name);        \
        !          1586:                                                        \
        !          1587:       in_section = private_data;                       \
        !          1588:     }                                                  \
        !          1589: }                                                      \
        !          1590:                                                        \
        !          1591: void                                                   \
        !          1592: read_only_private_data_section ()                      \
        !          1593: {                                                      \
        !          1594:   if (in_section != read_only_private_data)            \
        !          1595:     {                                                  \
        !          1596:       fprintf (asm_out_file, ".csect %s[RO]\n",                \
        !          1597:               xcoff_private_data_section_name);        \
        !          1598:       in_section = read_only_private_data;             \
        !          1599:     }                                                  \
        !          1600: }                                                      \
        !          1601:                                                        \
        !          1602: void                                                   \
        !          1603: toc_section ()                                         \
        !          1604: {                                                      \
        !          1605:   if (TARGET_MINIMAL_TOC)                              \
        !          1606:     {                                                  \
        !          1607:       static int toc_initialized = 0;                  \
        !          1608:                                                        \
        !          1609:       /* toc_section is always called at least once from ASM_FILE_START, \
        !          1610:         so this is guaranteed to always be defined once and only once   \
        !          1611:         in each file.  */                                               \
        !          1612:       if (! toc_initialized)                           \
        !          1613:        {                                               \
        !          1614:          fprintf (asm_out_file, ".toc\nLCTOC..0:\n");  \
        !          1615:          fprintf (asm_out_file, "\t.tc toc_table[TC],toc_table[RW]\n"); \
        !          1616:          toc_initialized = 1;                          \
        !          1617:        }                                               \
        !          1618:                                                        \
        !          1619:       if (in_section != toc)                           \
        !          1620:        fprintf (asm_out_file, ".csect toc_table[RW]\n"); \
        !          1621:     }                                                  \
        !          1622:   else                                                 \
        !          1623:     {                                                  \
        !          1624:       if (in_section != toc)                           \
        !          1625:         fprintf (asm_out_file, ".toc\n");              \
        !          1626:     }                                                  \
        !          1627:   in_section = toc;                                    \
        !          1628: }
        !          1629: 
        !          1630: /* This macro produces the initial definition of a function name.
        !          1631:    On the RS/6000, we need to place an extra '.' in the function name and
        !          1632:    output the function descriptor.  
        !          1633: 
        !          1634:    The csect for the function will have already been created by the
        !          1635:    `text_section' call previously done.  We do have to go back to that
        !          1636:    csect, however.  */
        !          1637: 
        !          1638: /* ??? What do the 16 and 044 in the .function line really mean?  */
        !          1639: 
        !          1640: #define ASM_DECLARE_FUNCTION_NAME(FILE,NAME,DECL)              \
        !          1641: { if (TREE_PUBLIC (DECL))                                      \
        !          1642:     {                                                          \
        !          1643:       fprintf (FILE, "\t.globl .");                            \
        !          1644:       RS6000_OUTPUT_BASENAME (FILE, NAME);                     \
        !          1645:       fprintf (FILE, "\n");                                    \
        !          1646:     }                                                          \
        !          1647:   else if (write_symbols == XCOFF_DEBUG)                       \
        !          1648:     {                                                          \
        !          1649:       fprintf (FILE, "\t.lglobl .");                           \
        !          1650:       RS6000_OUTPUT_BASENAME (FILE, NAME);                     \
        !          1651:       fprintf (FILE, "\n");                                    \
        !          1652:     }                                                          \
        !          1653:   fprintf (FILE, ".csect ");                                   \
        !          1654:   RS6000_OUTPUT_BASENAME (FILE, NAME);                         \
        !          1655:   fprintf (FILE, "[DS]\n");                                    \
        !          1656:   RS6000_OUTPUT_BASENAME (FILE, NAME);                         \
        !          1657:   fprintf (FILE, ":\n");                                       \
        !          1658:   fprintf (FILE, "\t.long .");                                 \
        !          1659:   RS6000_OUTPUT_BASENAME (FILE, NAME);                         \
        !          1660:   fprintf (FILE, ", TOC[tc0], 0\n");                           \
        !          1661:   fprintf (FILE, ".csect .text[PR]\n.");                               \
        !          1662:   RS6000_OUTPUT_BASENAME (FILE, NAME);                         \
        !          1663:   fprintf (FILE, ":\n");                                       \
        !          1664:   if (write_symbols == XCOFF_DEBUG)                            \
        !          1665:     xcoffout_declare_function (FILE, DECL, NAME);              \
        !          1666: }
        !          1667: 
        !          1668: /* Return non-zero if this entry is to be written into the constant pool
        !          1669:    in a special way.  We do so if this is a SYMBOL_REF, LABEL_REF or a CONST
        !          1670:    containing one of them.  If -mfp-in-toc (the default), we also do
        !          1671:    this for floating-point constants.  We actually can only do this
        !          1672:    if the FP formats of the target and host machines are the same, but
        !          1673:    we can't check that since not every file that uses
        !          1674:    GO_IF_LEGITIMATE_ADDRESS_P includes real.h.  */
        !          1675: 
        !          1676: #define ASM_OUTPUT_SPECIAL_POOL_ENTRY_P(X)                     \
        !          1677:   (GET_CODE (X) == SYMBOL_REF                                  \
        !          1678:    || (GET_CODE (X) == CONST && GET_CODE (XEXP (X, 0)) == PLUS \
        !          1679:        && GET_CODE (XEXP (XEXP (X, 0), 0)) == SYMBOL_REF)      \
        !          1680:    || GET_CODE (X) == LABEL_REF                                        \
        !          1681:    || (! (TARGET_NO_FP_IN_TOC && ! TARGET_MINIMAL_TOC)         \
        !          1682:        && GET_CODE (X) == CONST_DOUBLE                         \
        !          1683:        && GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT          \
        !          1684:        && BITS_PER_WORD == HOST_BITS_PER_INT))
        !          1685: 
        !          1686: /* Select section for constant in constant pool.
        !          1687: 
        !          1688:    On RS/6000, all constants are in the private read-only data area.
        !          1689:    However, if this is being placed in the TOC it must be output as a
        !          1690:    toc entry.  */
        !          1691: 
        !          1692: #define SELECT_RTX_SECTION(MODE, X)            \
        !          1693: { if (ASM_OUTPUT_SPECIAL_POOL_ENTRY_P (X))     \
        !          1694:     toc_section ();                            \
        !          1695:   else                                         \
        !          1696:     read_only_private_data_section ();         \
        !          1697: }
        !          1698: 
        !          1699: /* Macro to output a special constant pool entry.  Go to WIN if we output
        !          1700:    it.  Otherwise, it is written the usual way.
        !          1701: 
        !          1702:    On the RS/6000, toc entries are handled this way.  */
        !          1703: 
        !          1704: #define ASM_OUTPUT_SPECIAL_POOL_ENTRY(FILE, X, MODE, ALIGN, LABELNO, WIN)  \
        !          1705: { if (ASM_OUTPUT_SPECIAL_POOL_ENTRY_P (X))     \
        !          1706:     {                                          \
        !          1707:       output_toc (FILE, X, LABELNO);           \
        !          1708:       goto WIN;                                        \
        !          1709:     }                                          \
        !          1710: }
        !          1711: 
        !          1712: /* Select the section for an initialized data object.
        !          1713: 
        !          1714:    On the RS/6000, we have a special section for all variables except those
        !          1715:    that are static.  */
        !          1716: 
        !          1717: #define SELECT_SECTION(EXP,RELOC)                      \
        !          1718: {                                                      \
        !          1719:   if ((TREE_READONLY (EXP)                             \
        !          1720:        || (TREE_CODE (EXP) == STRING_CST               \
        !          1721:           && !flag_writable_strings))                  \
        !          1722:       && ! TREE_THIS_VOLATILE (EXP)                    \
        !          1723:       && ! (RELOC))                                    \
        !          1724:     {                                                  \
        !          1725:       if (TREE_PUBLIC (EXP))                           \
        !          1726:         read_only_data_section ();                     \
        !          1727:       else                                             \
        !          1728:         read_only_private_data_section ();             \
        !          1729:     }                                                  \
        !          1730:   else                                                 \
        !          1731:     {                                                  \
        !          1732:       if (TREE_PUBLIC (EXP))                           \
        !          1733:         data_section ();                               \
        !          1734:       else                                             \
        !          1735:         private_data_section ();                       \
        !          1736:     }                                                  \
        !          1737: }
        !          1738: 
        !          1739: /* This outputs NAME to FILE up to the first null or '['.  */
        !          1740: 
        !          1741: #define RS6000_OUTPUT_BASENAME(FILE, NAME)     \
        !          1742:   if ((NAME)[0] == '*')                                \
        !          1743:     assemble_name (FILE, NAME);                \
        !          1744:   else                                         \
        !          1745:     {                                          \
        !          1746:       char *_p;                                        \
        !          1747:       for (_p = (NAME); *_p && *_p != '['; _p++) \
        !          1748:         fputc (*_p, FILE);                             \
        !          1749:     }
        !          1750: 
        !          1751: /* Output something to declare an external symbol to the assembler.  Most
        !          1752:    assemblers don't need this.  
        !          1753: 
        !          1754:    If we haven't already, add "[RW]" (or "[DS]" for a function) to the
        !          1755:    name.  Normally we write this out along with the name.  In the few cases
        !          1756:    where we can't, it gets stripped off.  */
        !          1757: 
        !          1758: #define ASM_OUTPUT_EXTERNAL(FILE, DECL, NAME)  \
        !          1759: { rtx _symref = XEXP (DECL_RTL (DECL), 0);     \
        !          1760:   if ((TREE_CODE (DECL) == VAR_DECL            \
        !          1761:        || TREE_CODE (DECL) == FUNCTION_DECL)   \
        !          1762:       && (NAME)[0] != '*'                      \
        !          1763:       && (NAME)[strlen (NAME) - 1] != ']')     \
        !          1764:     {                                          \
        !          1765:       char *_name = (char *) permalloc (strlen (XSTR (_symref, 0)) + 5); \
        !          1766:       strcpy (_name, XSTR (_symref, 0));       \
        !          1767:       strcat (_name, TREE_CODE (DECL) == FUNCTION_DECL ? "[DS]" : "[RW]"); \
        !          1768:       XSTR (_symref, 0) = _name;               \
        !          1769:     }                                          \
        !          1770:   fprintf (FILE, "\t.extern ");                        \
        !          1771:   assemble_name (FILE, XSTR (_symref, 0));     \
        !          1772:   if (TREE_CODE (DECL) == FUNCTION_DECL)       \
        !          1773:     {                                          \
        !          1774:       fprintf (FILE, "\n\t.extern .");         \
        !          1775:       RS6000_OUTPUT_BASENAME (FILE, XSTR (_symref, 0));        \
        !          1776:     }                                          \
        !          1777:   fprintf (FILE, "\n");                                \
        !          1778: }
        !          1779: 
        !          1780: /* Similar, but for libcall.  We only have to worry about the function name,
        !          1781:    not that of the descriptor. */
        !          1782: 
        !          1783: #define ASM_OUTPUT_EXTERNAL_LIBCALL(FILE, FUN) \
        !          1784: { fprintf (FILE, "\t.extern .");               \
        !          1785:   assemble_name (FILE, XSTR (FUN, 0));         \
        !          1786:   fprintf (FILE, "\n");                                \
        !          1787: }
        !          1788: 
        !          1789: /* Output to assembler file text saying following lines
        !          1790:    may contain character constants, extra white space, comments, etc.  */
        !          1791: 
        !          1792: #define ASM_APP_ON ""
        !          1793: 
        !          1794: /* Output to assembler file text saying following lines
        !          1795:    no longer contain unusual constructs.  */
        !          1796: 
        !          1797: #define ASM_APP_OFF ""
        !          1798: 
        !          1799: /* Output before instructions.  */
        !          1800: 
        !          1801: #define TEXT_SECTION_ASM_OP ".csect .text[PR]"
        !          1802: 
        !          1803: /* Output before writable data.  */
        !          1804: 
        !          1805: #define DATA_SECTION_ASM_OP ".csect .data[RW]"
        !          1806: 
        !          1807: /* How to refer to registers in assembler output.
        !          1808:    This sequence is indexed by compiler's hard-register-number (see above).  */
        !          1809: 
        !          1810: #define REGISTER_NAMES \
        !          1811:  {"0", "1", "2", "3", "4", "5", "6", "7",              \
        !          1812:   "8", "9", "10", "11", "12", "13", "14", "15",                \
        !          1813:   "16", "17", "18", "19", "20", "21", "22", "23",      \
        !          1814:   "24", "25", "26", "27", "28", "29", "30", "31",      \
        !          1815:   "0", "1", "2", "3", "4", "5", "6", "7",              \
        !          1816:   "8", "9", "10", "11", "12", "13", "14", "15",                \
        !          1817:   "16", "17", "18", "19", "20", "21", "22", "23",      \
        !          1818:   "24", "25", "26", "27", "28", "29", "30", "31",      \
        !          1819:   "mq", "lr", "ctr", "ap",                             \
        !          1820:   "0", "1", "2", "3", "4", "5", "6", "7" }
        !          1821: 
        !          1822: /* Table of additional register names to use in user input.  */
        !          1823: 
        !          1824: #define ADDITIONAL_REGISTER_NAMES \
        !          1825:  {"r0",    0, "r1",    1, "r2",    2, "r3",    3,      \
        !          1826:   "r4",    4, "r5",    5, "r6",    6, "r7",    7,      \
        !          1827:   "r8",    8, "r9",    9, "r10",  10, "r11",  11,      \
        !          1828:   "r12",  12, "r13",  13, "r14",  14, "r15",  15,      \
        !          1829:   "r16",  16, "r17",  17, "r18",  18, "r19",  19,      \
        !          1830:   "r20",  20, "r21",  21, "r22",  22, "r23",  23,      \
        !          1831:   "r24",  24, "r25",  25, "r26",  26, "r27",  27,      \
        !          1832:   "r28",  28, "r29",  29, "r30",  30, "r31",  31,      \
        !          1833:   "fr0",  32, "fr1",  33, "fr2",  34, "fr3",  35,      \
        !          1834:   "fr4",  36, "fr5",  37, "fr6",  38, "fr7",  39,      \
        !          1835:   "fr8",  40, "fr9",  41, "fr10", 42, "fr11", 43,      \
        !          1836:   "fr12", 44, "fr13", 45, "fr14", 46, "fr15", 47,      \
        !          1837:   "fr16", 48, "fr17", 49, "fr18", 50, "fr19", 51,      \
        !          1838:   "fr20", 52, "fr21", 53, "fr22", 54, "fr23", 55,      \
        !          1839:   "fr24", 56, "fr25", 57, "fr26", 58, "fr27", 59,      \
        !          1840:   "fr28", 60, "fr29", 61, "fr30", 62, "fr31", 63,      \
        !          1841:   /* no additional names for: mq, lr, ctr, ap */       \
        !          1842:   "cr0",  68, "cr1",  69, "cr2",  70, "cr3",  71,      \
        !          1843:   "cr4",  72, "cr5",  73, "cr6",  74, "cr7",  75,      \
        !          1844:   "cc",   68 }
        !          1845: 
        !          1846: /* How to renumber registers for dbx and gdb.  */
        !          1847: 
        !          1848: #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
        !          1849: 
        !          1850: /* Text to write out after a CALL that may be replaced by glue code by
        !          1851:    the loader.  This depends on the AIX version.  */
        !          1852: #define RS6000_CALL_GLUE "cror 31,31,31"
        !          1853: 
        !          1854: /* This is how to output the definition of a user-level label named NAME,
        !          1855:    such as the label on a static function or variable NAME.  */
        !          1856: 
        !          1857: #define ASM_OUTPUT_LABEL(FILE,NAME)    \
        !          1858:   do { RS6000_OUTPUT_BASENAME (FILE, NAME); fputs (":\n", FILE); } while (0)
        !          1859: 
        !          1860: /* This is how to output a command to make the user-level label named NAME
        !          1861:    defined for reference from other files.  */
        !          1862: 
        !          1863: #define ASM_GLOBALIZE_LABEL(FILE,NAME) \
        !          1864:   do { fputs ("\t.globl ", FILE);      \
        !          1865:        RS6000_OUTPUT_BASENAME (FILE, NAME); fputs ("\n", FILE);} while (0)
        !          1866: 
        !          1867: /* This is how to output a reference to a user-level label named NAME.
        !          1868:    `assemble_name' uses this.  */
        !          1869: 
        !          1870: #define ASM_OUTPUT_LABELREF(FILE,NAME) \
        !          1871:   fprintf (FILE, NAME)
        !          1872: 
        !          1873: /* This is how to output an internal numbered label where
        !          1874:    PREFIX is the class of label and NUM is the number within the class.  */
        !          1875: 
        !          1876: #define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM)     \
        !          1877:   fprintf (FILE, "%s..%d:\n", PREFIX, NUM)
        !          1878: 
        !          1879: /* This is how to output a label for a jump table.  Arguments are the same as
        !          1880:    for ASM_OUTPUT_INTERNAL_LABEL, except the insn for the jump table is
        !          1881:    passed. */
        !          1882: 
        !          1883: #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,TABLEINSN)       \
        !          1884: { ASM_OUTPUT_ALIGN (FILE, 2); ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM); }
        !          1885: 
        !          1886: /* This is how to store into the string LABEL
        !          1887:    the symbol_ref name of an internal numbered label where
        !          1888:    PREFIX is the class of label and NUM is the number within the class.
        !          1889:    This is suitable for output with `assemble_name'.  */
        !          1890: 
        !          1891: #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)  \
        !          1892:   sprintf (LABEL, "%s..%d", PREFIX, NUM)
        !          1893: 
        !          1894: /* This is how to output an assembler line defining a `double' constant.  */
        !          1895: 
        !          1896: #define ASM_OUTPUT_DOUBLE(FILE, VALUE)                                 \
        !          1897:   {                                                                    \
        !          1898:     if (REAL_VALUE_ISINF (VALUE)                                       \
        !          1899:         || REAL_VALUE_ISNAN (VALUE)                                    \
        !          1900:        || REAL_VALUE_MINUS_ZERO (VALUE))                               \
        !          1901:       {                                                                        \
        !          1902:        long t[2];                                                      \
        !          1903:        REAL_VALUE_TO_TARGET_DOUBLE ((VALUE), t);                       \
        !          1904:        fprintf (FILE, "\t.long 0x%lx\n\t.long 0x%lx\n",                \
        !          1905:                t[0] & 0xffffffff, t[1] & 0xffffffff);                  \
        !          1906:       }                                                                        \
        !          1907:     else                                                               \
        !          1908:       {                                                                        \
        !          1909:        char str[30];                                                   \
        !          1910:        REAL_VALUE_TO_DECIMAL (VALUE, "%.20e", str);                    \
        !          1911:        fprintf (FILE, "\t.double 0d%s\n", str);                        \
        !          1912:       }                                                                        \
        !          1913:   }
        !          1914: 
        !          1915: /* This is how to output an assembler line defining a `float' constant.  */
        !          1916: 
        !          1917: #define ASM_OUTPUT_FLOAT(FILE, VALUE)                                  \
        !          1918:   {                                                                    \
        !          1919:     if (REAL_VALUE_ISINF (VALUE)                                       \
        !          1920:         || REAL_VALUE_ISNAN (VALUE)                                    \
        !          1921:        || REAL_VALUE_MINUS_ZERO (VALUE))                               \
        !          1922:       {                                                                        \
        !          1923:        long t;                                                         \
        !          1924:        REAL_VALUE_TO_TARGET_SINGLE ((VALUE), t);                       \
        !          1925:        fprintf (FILE, "\t.long 0x%lx\n", t & 0xffffffff);              \
        !          1926:       }                                                                        \
        !          1927:     else                                                               \
        !          1928:       {                                                                        \
        !          1929:        char str[30];                                                   \
        !          1930:        REAL_VALUE_TO_DECIMAL ((VALUE), "%.20e", str);                  \
        !          1931:        fprintf (FILE, "\t.float 0d%s\n", str);                         \
        !          1932:       }                                                                        \
        !          1933:   }
        !          1934: 
        !          1935: /* This is how to output an assembler line defining an `int' constant.  */
        !          1936: 
        !          1937: #define ASM_OUTPUT_INT(FILE,VALUE)  \
        !          1938: ( fprintf (FILE, "\t.long "),                  \
        !          1939:   output_addr_const (FILE, (VALUE)),           \
        !          1940:   fprintf (FILE, "\n"))
        !          1941: 
        !          1942: /* Likewise for `char' and `short' constants.  */
        !          1943: 
        !          1944: #define ASM_OUTPUT_SHORT(FILE,VALUE)  \
        !          1945: ( fprintf (FILE, "\t.short "),                 \
        !          1946:   output_addr_const (FILE, (VALUE)),           \
        !          1947:   fprintf (FILE, "\n"))
        !          1948: 
        !          1949: #define ASM_OUTPUT_CHAR(FILE,VALUE)  \
        !          1950: ( fprintf (FILE, "\t.byte "),                  \
        !          1951:   output_addr_const (FILE, (VALUE)),           \
        !          1952:   fprintf (FILE, "\n"))
        !          1953: 
        !          1954: /* This is how to output an assembler line for a numeric constant byte.  */
        !          1955: 
        !          1956: #define ASM_OUTPUT_BYTE(FILE,VALUE)  \
        !          1957:   fprintf (FILE, "\t.byte 0x%x\n", (VALUE))
        !          1958: 
        !          1959: /* This is how to output an assembler line to define N characters starting
        !          1960:    at P to FILE.  */
        !          1961: 
        !          1962: #define ASM_OUTPUT_ASCII(FILE, P, N)  output_ascii ((FILE), (P), (N))
        !          1963: 
        !          1964: /* This is how to output code to push a register on the stack.
        !          1965:    It need not be very fast code.  */
        !          1966: 
        !          1967: #define ASM_OUTPUT_REG_PUSH(FILE,REGNO)  \
        !          1968:   asm_fprintf (FILE, "\{tstu|stwu} %s,-4(r1)\n", reg_names[REGNO]);
        !          1969: 
        !          1970: /* This is how to output an insn to pop a register from the stack.
        !          1971:    It need not be very fast code.  */
        !          1972: 
        !          1973: #define ASM_OUTPUT_REG_POP(FILE,REGNO)  \
        !          1974:   asm_fprintf (FILE, "\t{l|lwz} %s,0(r1)\n\t{ai|addic} r1,r1,4\n",  \
        !          1975:     reg_names[REGNO])
        !          1976: 
        !          1977: /* This is how to output an element of a case-vector that is absolute. 
        !          1978:    (RS/6000 does not use such vectors, but we must define this macro
        !          1979:    anyway.)   */
        !          1980: 
        !          1981: #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
        !          1982:   fprintf (FILE, "\t.long L..%d\n", VALUE)
        !          1983: 
        !          1984: /* This is how to output an element of a case-vector that is relative.  */
        !          1985: 
        !          1986: #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, VALUE, REL)     \
        !          1987:   fprintf (FILE, "\t.long L..%d-L..%d\n", VALUE, REL)
        !          1988: 
        !          1989: /* This is how to output an assembler line
        !          1990:    that says to advance the location counter
        !          1991:    to a multiple of 2**LOG bytes.  */
        !          1992: 
        !          1993: #define ASM_OUTPUT_ALIGN(FILE,LOG)     \
        !          1994:   if ((LOG) != 0)                      \
        !          1995:     fprintf (FILE, "\t.align %d\n", (LOG))
        !          1996: 
        !          1997: #define ASM_OUTPUT_SKIP(FILE,SIZE)  \
        !          1998:   fprintf (FILE, "\t.space %d\n", (SIZE))
        !          1999: 
        !          2000: /* This says how to output an assembler line
        !          2001:    to define a global common symbol.  */
        !          2002: 
        !          2003: #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)   \
        !          2004:   do { fputs (".comm ", (FILE));                       \
        !          2005:        RS6000_OUTPUT_BASENAME ((FILE), (NAME));                \
        !          2006:        fprintf ((FILE), ",%d\n", (SIZE)); } while (0)
        !          2007: 
        !          2008: /* This says how to output an assembler line
        !          2009:    to define a local common symbol.  */
        !          2010: 
        !          2011: #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE,ROUNDED)     \
        !          2012:   do { fputs (".lcomm ", (FILE));                      \
        !          2013:        RS6000_OUTPUT_BASENAME ((FILE), (NAME));                \
        !          2014:        fprintf ((FILE), ",%d,%s\n", (SIZE), xcoff_bss_section_name); \
        !          2015:      } while (0)
        !          2016: 
        !          2017: /* Store in OUTPUT a string (made with alloca) containing
        !          2018:    an assembler-name for a local static variable named NAME.
        !          2019:    LABELNO is an integer which is different for each call.  */
        !          2020: 
        !          2021: #define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO) \
        !          2022: ( (OUTPUT) = (char *) alloca (strlen ((NAME)) + 10),   \
        !          2023:   sprintf ((OUTPUT), "%s.%d", (NAME), (LABELNO)))
        !          2024: 
        !          2025: /* Define the parentheses used to group arithmetic operations
        !          2026:    in assembler code.  */
        !          2027: 
        !          2028: #define ASM_OPEN_PAREN "("
        !          2029: #define ASM_CLOSE_PAREN ")"
        !          2030: 
        !          2031: /* Define results of standard character escape sequences.  */
        !          2032: #define TARGET_BELL 007
        !          2033: #define TARGET_BS 010
        !          2034: #define TARGET_TAB 011
        !          2035: #define TARGET_NEWLINE 012
        !          2036: #define TARGET_VT 013
        !          2037: #define TARGET_FF 014
        !          2038: #define TARGET_CR 015
        !          2039: 
        !          2040: /* Print operand X (an rtx) in assembler syntax to file FILE.
        !          2041:    CODE is a letter or dot (`z' in `%z0') or 0 if no letter was specified.
        !          2042:    For `%' followed by punctuation, CODE is the punctuation and X is null.  */
        !          2043: 
        !          2044: #define PRINT_OPERAND(FILE, X, CODE)  print_operand (FILE, X, CODE)
        !          2045: 
        !          2046: /* Define which CODE values are valid.  */
        !          2047: 
        !          2048: #define PRINT_OPERAND_PUNCT_VALID_P(CODE)  ((CODE) == '.')
        !          2049: 
        !          2050: /* Print a memory address as an operand to reference that memory location.  */
        !          2051: 
        !          2052: #define PRINT_OPERAND_ADDRESS(FILE, ADDR) print_operand_address (FILE, ADDR)
        !          2053: 
        !          2054: /* Define the codes that are matched by predicates in rs6000.c.  */
        !          2055: 
        !          2056: #define PREDICATE_CODES \
        !          2057:   {"short_cint_operand", {CONST_INT}},                         \
        !          2058:   {"u_short_cint_operand", {CONST_INT}},                       \
        !          2059:   {"non_short_cint_operand", {CONST_INT}},                     \
        !          2060:   {"gpc_reg_operand", {SUBREG, REG}},                          \
        !          2061:   {"cc_reg_operand", {SUBREG, REG}},                           \
        !          2062:   {"reg_or_short_operand", {SUBREG, REG, CONST_INT}},          \
        !          2063:   {"reg_or_neg_short_operand", {SUBREG, REG, CONST_INT}},      \
        !          2064:   {"reg_or_u_short_operand", {SUBREG, REG, CONST_INT}},                \
        !          2065:   {"reg_or_cint_operand", {SUBREG, REG, CONST_INT}},           \
        !          2066:   {"easy_fp_constant", {CONST_DOUBLE}},                                \
        !          2067:   {"reg_or_mem_operand", {SUBREG, MEM, REG}},                  \
        !          2068:   {"fp_reg_or_mem_operand", {SUBREG, MEM, REG}},               \
        !          2069:   {"mem_or_easy_const_operand", {SUBREG, MEM, CONST_DOUBLE}},  \
        !          2070:   {"add_operand", {SUBREG, REG, CONST_INT}},                   \
        !          2071:   {"non_add_cint_operand", {CONST_INT}},                       \
        !          2072:   {"and_operand", {SUBREG, REG, CONST_INT}},                   \
        !          2073:   {"non_and_cint_operand", {CONST_INT}},                       \
        !          2074:   {"logical_operand", {SUBREG, REG, CONST_INT}},               \
        !          2075:   {"non_logical_cint_operand", {CONST_INT}},                   \
        !          2076:   {"mask_operand", {CONST_INT}},                               \
        !          2077:   {"call_operand", {SYMBOL_REF, REG}},                         \
        !          2078:   {"current_file_function_operand", {SYMBOL_REF}},             \
        !          2079:   {"input_operand", {SUBREG, MEM, REG, CONST_INT}},            \
        !          2080:   {"load_multiple_operation", {PARALLEL}},                     \
        !          2081:   {"store_multiple_operation", {PARALLEL}},                    \
        !          2082:   {"branch_comparison_operator", {EQ, NE, LE, LT, GE,          \
        !          2083:                                  GT, LEU, LTU, GEU, GTU}},     \
        !          2084:   {"scc_comparison_operator", {EQ, NE, LE, LT, GE,             \
        !          2085:                               GT, LEU, LTU, GEU, GTU}},

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