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

1.1     ! root        1: /* Definitions of target machine for GNU compiler, for DEC Alpha.
        !             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: /* Names to predefine in the preprocessor for this target machine.  */
        !            23: 
        !            24: #define CPP_PREDEFINES "\
        !            25: -Dunix -D__osf__ -D__alpha -D__alpha__ -D_LONGLONG -DSYSTYPE_BSD  \
        !            26: -D_SYSTYPE_BSD -Asystem(unix) -Asystem(xpg4) -Acpu(alpha) -Amachine(alpha)"
        !            27: 
        !            28: /* Write out the correct language type definition for the header files.  
        !            29:    Unless we have assembler language, write out the symbols for C.  */
        !            30: #define CPP_SPEC "\
        !            31: %{!.S: -D__LANGUAGE_C__ -D__LANGUAGE_C %{!ansi:-DLANGUAGE_C}}  \
        !            32: %{.S:  -D__LANGUAGE_ASSEMBLY__ -D__LANGUAGE_ASSEMBLY %{!ansi:-DLANGUAGE_ASSEMBLY}} \
        !            33: %{.cc: -D__LANGUAGE_C_PLUS_PLUS__ -D__LANGUAGE_C_PLUS_PLUS -D__cplusplus} \
        !            34: %{.cxx:        -D__LANGUAGE_C_PLUS_PLUS__ -D__LANGUAGE_C_PLUS_PLUS -D__cplusplus} \
        !            35: %{.C:  -D__LANGUAGE_C_PLUS_PLUS__ -D__LANGUAGE_C_PLUS_PLUS -D__cplusplus} \
        !            36: %{.m:  -D__LANGUAGE_OBJECTIVE_C__ -D__LANGUAGE_OBJECTIVE_C}"
        !            37: 
        !            38: /* Set the spec to use for signed char.  The default tests the above macro
        !            39:    but DEC's compiler can't handle the conditional in a "constant"
        !            40:    operand.  */
        !            41: 
        !            42: #define SIGNED_CHAR_SPEC "%{funsigned-char:-D__CHAR_UNSIGNED__}"
        !            43: 
        !            44: /* No point in running CPP on our assembler output.  */
        !            45: #define ASM_SPEC "-nocpp"
        !            46: 
        !            47: /* Right now Alpha OSF/1 doesn't seem to have debugging libraries.  */
        !            48: 
        !            49: #define LIB_SPEC "%{p:-lprof1} -lc"
        !            50: 
        !            51: /* Pass "-G 8" to ld because Alpha's CC does.  Pass -O3 if we are optimizing,
        !            52:    -O1 if we are not.  Pass -non_shared or -call_shared as appropriate.  */
        !            53: #define LINK_SPEC  \
        !            54:   "-G 8 %{O*:-O3} %{!O*:-O1} %{static:-non_shared} %{!static:-call_shared}"
        !            55: 
        !            56: /* Print subsidiary information on the compiler version in use.  */
        !            57: #define TARGET_VERSION
        !            58: 
        !            59: /* Define the location for the startup file on OSF/1 for Alpha.  */
        !            60: 
        !            61: #define MD_STARTFILE_PREFIX "/usr/lib/cmplrs/cc/"
        !            62: 
        !            63: /* Run-time compilation parameters selecting different hardware subsets.  */
        !            64: 
        !            65: extern int target_flags;
        !            66: 
        !            67: /* This means that floating-point support exists in the target implementation
        !            68:    of the Alpha architecture.  This is usually the default.  */
        !            69: 
        !            70: #define TARGET_FP      (target_flags & 1)
        !            71: 
        !            72: /* This means that floating-point registers are allowed to be used.  Note
        !            73:    that Alpha implementations without FP operations are required to
        !            74:    provide the FP registers.  */
        !            75: 
        !            76: #define TARGET_FPREGS  (target_flags & 2)
        !            77: 
        !            78: /* This means that gas is used to process the assembler file.  */
        !            79: 
        !            80: #define MASK_GAS 4
        !            81: #define TARGET_GAS     (target_flags & MASK_GAS)
        !            82: 
        !            83: /* Macro to define tables used to set the flags.
        !            84:    This is a list in braces of pairs in braces,
        !            85:    each pair being { "NAME", VALUE }
        !            86:    where VALUE is the bits to set or minus the bits to clear.
        !            87:    An empty string NAME is used to identify the default VALUE.  */
        !            88: 
        !            89: #define TARGET_SWITCHES                        \
        !            90:   { {"no-soft-float", 1},              \
        !            91:     {"soft-float", -1},                        \
        !            92:     {"fp-regs", 2},                    \
        !            93:     {"no-fp-regs", -3},                        \
        !            94:     {"alpha-as", -MASK_GAS},           \
        !            95:     {"gas", MASK_GAS},                 \
        !            96:     {"", TARGET_DEFAULT} }
        !            97: 
        !            98: #define TARGET_DEFAULT 3
        !            99: 
        !           100: /* Define this macro to change register usage conditional on target flags.
        !           101: 
        !           102:    On the Alpha, we use this to disable the floating-point registers when
        !           103:    they don't exist.  */
        !           104: 
        !           105: #define CONDITIONAL_REGISTER_USAGE     \
        !           106:   if (! TARGET_FPREGS)                 \
        !           107:     for (i = 32; i < 64; i++)          \
        !           108:       fixed_regs[i] = call_used_regs[i] = 1;
        !           109: 
        !           110: /* Define this to change the optimizations performed by default.  */
        !           111: 
        !           112: #define OPTIMIZATION_OPTIONS(LEVEL)    \
        !           113: {                                      \
        !           114:   if ((LEVEL) > 0)                     \
        !           115:     {                                  \
        !           116:       flag_force_addr = 1;             \
        !           117:       flag_force_mem = 1;              \
        !           118:       flag_omit_frame_pointer = 1;     \
        !           119:     }                                  \
        !           120: }
        !           121: 
        !           122: /* target machine storage layout */
        !           123: 
        !           124: /* Define to enable software floating point emulation. */
        !           125: #define REAL_ARITHMETIC
        !           126: 
        !           127: /* Define the size of `int'.  The default is the same as the word size.  */
        !           128: #define INT_TYPE_SIZE 32
        !           129: 
        !           130: /* Define the size of `long long'.  The default is the twice the word size.  */
        !           131: #define LONG_LONG_TYPE_SIZE 64
        !           132: 
        !           133: /* The two floating-point formats we support are S-floating, which is
        !           134:    4 bytes, and T-floating, which is 8 bytes.  `float' is S and `double'
        !           135:    and `long double' are T.  */
        !           136: 
        !           137: #define FLOAT_TYPE_SIZE 32
        !           138: #define DOUBLE_TYPE_SIZE 64
        !           139: #define LONG_DOUBLE_TYPE_SIZE 64
        !           140: 
        !           141: #define WCHAR_TYPE "short unsigned int"
        !           142: #define WCHAR_TYPE_SIZE 16
        !           143: 
        !           144: /* Define this macro if it is advisable to hold scalars in registers
        !           145:    in a wider mode than that declared by the program.  In such cases, 
        !           146:    the value is constrained to be within the bounds of the declared
        !           147:    type, but kept valid in the wider mode.  The signedness of the
        !           148:    extension may differ from that of the type.
        !           149: 
        !           150:    For Alpha, we always store objects in a full register.  32-bit objects
        !           151:    are always sign-extended, but smaller objects retain their signedness.  */
        !           152: 
        !           153: #define PROMOTE_MODE(MODE,UNSIGNEDP,TYPE)  \
        !           154:   if (GET_MODE_CLASS (MODE) == MODE_INT                \
        !           155:       && GET_MODE_SIZE (MODE) < UNITS_PER_WORD)        \
        !           156:     {                                          \
        !           157:       if ((MODE) == SImode)                    \
        !           158:        (UNSIGNEDP) = 0;                        \
        !           159:       (MODE) = DImode;                         \
        !           160:     }
        !           161: 
        !           162: /* Define this if function arguments should also be promoted using the above
        !           163:    procedure.  */
        !           164: 
        !           165: #define PROMOTE_FUNCTION_ARGS
        !           166: 
        !           167: /* Likewise, if the function return value is promoted.  */
        !           168: 
        !           169: #define PROMOTE_FUNCTION_RETURN
        !           170: 
        !           171: /* Define this if most significant bit is lowest numbered
        !           172:    in instructions that operate on numbered bit-fields.
        !           173: 
        !           174:    There are no such instructions on the Alpha, but the documentation
        !           175:    is little endian.  */
        !           176: #define BITS_BIG_ENDIAN 0
        !           177: 
        !           178: /* Define this if most significant byte of a word is the lowest numbered.
        !           179:    This is false on the Alpha.  */
        !           180: #define BYTES_BIG_ENDIAN 0
        !           181: 
        !           182: /* Define this if most significant word of a multiword number is lowest
        !           183:    numbered.
        !           184: 
        !           185:    For Alpha we can decide arbitrarily since there are no machine instructions
        !           186:    for them.  Might as well be consistent with bytes. */
        !           187: #define WORDS_BIG_ENDIAN 0
        !           188: 
        !           189: /* number of bits in an addressable storage unit */
        !           190: #define BITS_PER_UNIT 8
        !           191: 
        !           192: /* Width in bits of a "word", which is the contents of a machine register.
        !           193:    Note that this is not necessarily the width of data type `int';
        !           194:    if using 16-bit ints on a 68000, this would still be 32.
        !           195:    But on a machine with 16-bit registers, this would be 16.  */
        !           196: #define BITS_PER_WORD 64
        !           197: 
        !           198: /* Width of a word, in units (bytes).  */
        !           199: #define UNITS_PER_WORD 8
        !           200: 
        !           201: /* Width in bits of a pointer.
        !           202:    See also the macro `Pmode' defined below.  */
        !           203: #define POINTER_SIZE 64
        !           204: 
        !           205: /* Allocation boundary (in *bits*) for storing arguments in argument list.  */
        !           206: #define PARM_BOUNDARY 64
        !           207: 
        !           208: /* Boundary (in *bits*) on which stack pointer should be aligned.  */
        !           209: #define STACK_BOUNDARY 64
        !           210: 
        !           211: /* Allocation boundary (in *bits*) for the code of a function.  */
        !           212: #define FUNCTION_BOUNDARY 64
        !           213: 
        !           214: /* Alignment of field after `int : 0' in a structure.  */
        !           215: #define EMPTY_FIELD_BOUNDARY 64
        !           216: 
        !           217: /* Every structure's size must be a multiple of this.  */
        !           218: #define STRUCTURE_SIZE_BOUNDARY 8
        !           219: 
        !           220: /* A bitfield declared as `int' forces `int' alignment for the struct.  */
        !           221: #define PCC_BITFIELD_TYPE_MATTERS 1
        !           222: 
        !           223: /* Align loop starts for optimal branching.  
        !           224: 
        !           225:    ??? Kludge this and the next macro for the moment by not doing anything if
        !           226:    we don't optimize and also if we are writing ECOFF symbols to work around
        !           227:    a bug in DEC's assembler. */
        !           228: 
        !           229: #define ASM_OUTPUT_LOOP_ALIGN(FILE) \
        !           230:   if (optimize > 0 && write_symbols != SDB_DEBUG)  \
        !           231:     ASM_OUTPUT_ALIGN (FILE, 5)
        !           232: 
        !           233: /* This is how to align an instruction for optimal branching.
        !           234:    On Alpha we'll get better performance by aligning on a quadword
        !           235:    boundary.  */
        !           236: 
        !           237: #define ASM_OUTPUT_ALIGN_CODE(FILE)    \
        !           238:   if (optimize > 0 && write_symbols != SDB_DEBUG) \
        !           239:     ASM_OUTPUT_ALIGN ((FILE), 4)
        !           240: 
        !           241: /* No data type wants to be aligned rounder than this.  */
        !           242: #define BIGGEST_ALIGNMENT 64
        !           243: 
        !           244: /* Make strings word-aligned so strcpy from constants will be faster.  */
        !           245: #define CONSTANT_ALIGNMENT(EXP, ALIGN)  \
        !           246:   (TREE_CODE (EXP) == STRING_CST       \
        !           247:    && (ALIGN) < BITS_PER_WORD ? BITS_PER_WORD : (ALIGN))
        !           248: 
        !           249: /* Make arrays of chars word-aligned for the same reasons.  */
        !           250: #define DATA_ALIGNMENT(TYPE, ALIGN)            \
        !           251:   (TREE_CODE (TYPE) == ARRAY_TYPE              \
        !           252:    && TYPE_MODE (TREE_TYPE (TYPE)) == QImode   \
        !           253:    && (ALIGN) < BITS_PER_WORD ? BITS_PER_WORD : (ALIGN))
        !           254: 
        !           255: /* Set this non-zero if move instructions will actually fail to work
        !           256:    when given unaligned data.
        !           257: 
        !           258:    Since we get an error message when we do one, call them invalid.  */
        !           259: 
        !           260: #define STRICT_ALIGNMENT 1
        !           261: 
        !           262: /* Set this non-zero if unaligned move instructions are extremely slow.
        !           263: 
        !           264:    On the Alpha, they trap.  */
        !           265: 
        !           266: #define SLOW_UNALIGNED_ACCESS 1
        !           267: 
        !           268: /* Standard register usage.  */
        !           269: 
        !           270: /* Number of actual hardware registers.
        !           271:    The hardware registers are assigned numbers for the compiler
        !           272:    from 0 to just below FIRST_PSEUDO_REGISTER.
        !           273:    All registers that the compiler knows about must be given numbers,
        !           274:    even those that are not normally considered general registers.
        !           275: 
        !           276:    We define all 32 integer registers, even though $31 is always zero,
        !           277:    and all 32 floating-point registers, even though $f31 is also
        !           278:    always zero.  We do not bother defining the FP status register and
        !           279:    there are no other registers. 
        !           280: 
        !           281:    Since $31 is always zero, we will use register number 31 as the
        !           282:    argument pointer.  It will never appear in the generated code
        !           283:    because we will always be eliminating it in favor of the stack
        !           284:    poointer or frame pointer.  */
        !           285: 
        !           286: #define FIRST_PSEUDO_REGISTER 64
        !           287: 
        !           288: /* 1 for registers that have pervasive standard uses
        !           289:    and are not available for the register allocator.  */
        !           290: 
        !           291: #define FIXED_REGISTERS  \
        !           292:  {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
        !           293:   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, \
        !           294:   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
        !           295:   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 }
        !           296: 
        !           297: /* 1 for registers not available across function calls.
        !           298:    These must include the FIXED_REGISTERS and also any
        !           299:    registers that can be used without being saved.
        !           300:    The latter must include the registers where values are returned
        !           301:    and the register where structure-value addresses are passed.
        !           302:    Aside from that, you can include as many other registers as you like.  */
        !           303: #define CALL_USED_REGISTERS  \
        !           304:  {1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, \
        !           305:   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 1, \
        !           306:   1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, \
        !           307:   1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }
        !           308: 
        !           309: /* List the order in which to allocate registers.  Each register must be
        !           310:    listed once, even those in FIXED_REGISTERS.
        !           311: 
        !           312:    We allocate in the following order:
        !           313:    $f1                 (nonsaved floating-point register)
        !           314:    $f10-$f15           (likewise)
        !           315:    $f22-$f30           (likewise)
        !           316:    $f21-$f16           (likewise, but input args)
        !           317:    $f0                 (nonsaved, but return value)
        !           318:    $f2-$f9             (saved floating-point registers)
        !           319:    $1-$8               (nonsaved integer registers)
        !           320:    $22-$25             (likewise)
        !           321:    $28                 (likewise)
        !           322:    $0                  (likewise, but return value)
        !           323:    $21-$16             (likewise, but input args)
        !           324:    $27                 (procedure value)
        !           325:    $9-$14              (saved integer registers)
        !           326:    $26                 (return PC)
        !           327:    $15                 (frame pointer)
        !           328:    $29                 (global pointer)
        !           329:    $30, $31, $f31      (stack pointer and always zero/ap)  */
        !           330: 
        !           331: #define REG_ALLOC_ORDER                \
        !           332:   {33,                                 \
        !           333:    42, 43, 44, 45, 46, 47,             \
        !           334:    54, 55, 56, 57, 58, 59, 60, 61, 62, \
        !           335:    53, 52, 51, 50, 49, 48,             \
        !           336:    32,                                 \
        !           337:    34, 35, 36, 37, 38, 39, 40, 41,     \
        !           338:    1, 2, 3, 4, 5, 6, 7, 8,             \
        !           339:    22, 23, 24, 25,                     \
        !           340:    28,                                 \
        !           341:    0,                                  \
        !           342:    21, 20, 19, 18, 17, 16,             \
        !           343:    27,                                 \
        !           344:    9, 10, 11, 12, 13, 14,              \
        !           345:    26,                                 \
        !           346:    15,                                 \
        !           347:    29,                                 \
        !           348:    30, 31, 63 }
        !           349: 
        !           350: /* Return number of consecutive hard regs needed starting at reg REGNO
        !           351:    to hold something of mode MODE.
        !           352:    This is ordinarily the length in words of a value of mode MODE
        !           353:    but can be less for certain modes in special long registers.  */
        !           354: 
        !           355: #define HARD_REGNO_NREGS(REGNO, MODE)   \
        !           356:   ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
        !           357: 
        !           358: /* Value is 1 if hard register REGNO can hold a value of machine-mode MODE.
        !           359:    On Alpha, the integer registers can hold any mode.  The floating-point
        !           360:    registers can hold 32-bit and 64-bit integers as well, but not 16-bit
        !           361:    or 8-bit values.  If we only allowed the larger integers into FP registers,
        !           362:    we'd have to say that QImode and SImode aren't tiable, which is a
        !           363:    pain.  So say all registers can hold everything and see how that works.  */
        !           364: 
        !           365: #define HARD_REGNO_MODE_OK(REGNO, MODE) 1
        !           366: 
        !           367: /* Value is 1 if it is a good idea to tie two pseudo registers
        !           368:    when one has mode MODE1 and one has mode MODE2.
        !           369:    If HARD_REGNO_MODE_OK could produce different values for MODE1 and MODE2,
        !           370:    for any hard reg, then this must be 0 for correct output.  */
        !           371: 
        !           372: #define MODES_TIEABLE_P(MODE1, MODE2) 1
        !           373: 
        !           374: /* Specify the registers used for certain standard purposes.
        !           375:    The values of these macros are register numbers.  */
        !           376: 
        !           377: /* Alpha pc isn't overloaded on a register that the compiler knows about.  */
        !           378: /* #define PC_REGNUM  */
        !           379: 
        !           380: /* Register to use for pushing function arguments.  */
        !           381: #define STACK_POINTER_REGNUM 30
        !           382: 
        !           383: /* Base register for access to local variables of the function.  */
        !           384: #define FRAME_POINTER_REGNUM 15
        !           385: 
        !           386: /* Value should be nonzero if functions must have frame pointers.
        !           387:    Zero means the frame pointer need not be set up (and parms
        !           388:    may be accessed via the stack pointer) in functions that seem suitable.
        !           389:    This is computed in `reload', in reload1.c.  */
        !           390: #define FRAME_POINTER_REQUIRED 0
        !           391: 
        !           392: /* Base register for access to arguments of the function.  */
        !           393: #define ARG_POINTER_REGNUM 31
        !           394: 
        !           395: /* Register in which static-chain is passed to a function. 
        !           396: 
        !           397:    For the Alpha, this is based on an example; the calling sequence
        !           398:    doesn't seem to specify this.  */
        !           399: #define STATIC_CHAIN_REGNUM 1
        !           400: 
        !           401: /* Register in which address to store a structure value
        !           402:    arrives in the function.  On the Alpha, the address is passed
        !           403:    as a hidden argument.  */
        !           404: #define STRUCT_VALUE 0
        !           405: 
        !           406: /* Define the classes of registers for register constraints in the
        !           407:    machine description.  Also define ranges of constants.
        !           408: 
        !           409:    One of the classes must always be named ALL_REGS and include all hard regs.
        !           410:    If there is more than one class, another class must be named NO_REGS
        !           411:    and contain no registers.
        !           412: 
        !           413:    The name GENERAL_REGS must be the name of a class (or an alias for
        !           414:    another name such as ALL_REGS).  This is the class of registers
        !           415:    that is allowed by "g" or "r" in a register constraint.
        !           416:    Also, registers outside this class are allocated only when
        !           417:    instructions express preferences for them.
        !           418: 
        !           419:    The classes must be numbered in nondecreasing order; that is,
        !           420:    a larger-numbered class must never be contained completely
        !           421:    in a smaller-numbered class.
        !           422: 
        !           423:    For any two classes, it is very desirable that there be another
        !           424:    class that represents their union.  */
        !           425:    
        !           426: enum reg_class { NO_REGS, GENERAL_REGS, FLOAT_REGS, ALL_REGS,
        !           427:                 LIM_REG_CLASSES };
        !           428: 
        !           429: #define N_REG_CLASSES (int) LIM_REG_CLASSES
        !           430: 
        !           431: /* Give names of register classes as strings for dump file.   */
        !           432: 
        !           433: #define REG_CLASS_NAMES                                \
        !           434:  {"NO_REGS", "GENERAL_REGS", "FLOAT_REGS", "ALL_REGS" }
        !           435: 
        !           436: /* Define which registers fit in which classes.
        !           437:    This is an initializer for a vector of HARD_REG_SET
        !           438:    of length N_REG_CLASSES.  */
        !           439: 
        !           440: #define REG_CLASS_CONTENTS     \
        !           441:   { {0, 0}, {~0, 0}, {0, ~0}, {~0, ~0} }
        !           442: 
        !           443: /* The same information, inverted:
        !           444:    Return the class number of the smallest class containing
        !           445:    reg number REGNO.  This could be a conditional expression
        !           446:    or could index an array.  */
        !           447: 
        !           448: #define REGNO_REG_CLASS(REGNO) ((REGNO) >= 32 ? FLOAT_REGS : GENERAL_REGS)
        !           449: 
        !           450: /* The class value for index registers, and the one for base regs.  */
        !           451: #define INDEX_REG_CLASS NO_REGS
        !           452: #define BASE_REG_CLASS GENERAL_REGS
        !           453: 
        !           454: /* Get reg_class from a letter such as appears in the machine description.  */
        !           455: 
        !           456: #define REG_CLASS_FROM_LETTER(C)       \
        !           457:  ((C) == 'f' ? FLOAT_REGS : NO_REGS)
        !           458: 
        !           459: /* Define this macro to change register usage conditional on target flags.  */
        !           460: /* #define CONDITIONAL_REGISTER_USAGE  */
        !           461: 
        !           462: /* The letters I, J, K, L, M, N, O, and P in a register constraint string
        !           463:    can be used to stand for particular ranges of immediate operands.
        !           464:    This macro defines what the ranges are.
        !           465:    C is the letter, and VALUE is a constant value.
        !           466:    Return 1 if VALUE is in the range specified by C.
        !           467: 
        !           468:    For Alpha:
        !           469:    `I' is used for the range of constants most insns can contain.
        !           470:    `J' is the constant zero.
        !           471:    `K' is used for the constant in an LDA insn.
        !           472:    `L' is used for the constant in a LDAH insn.
        !           473:    `M' is used for the constants that can be AND'ed with using a ZAP insn.
        !           474:    `N' is used for complemented 8-bit constants.
        !           475:    `O' is used for negated 8-bit constants.
        !           476:    `P' is used for the constants 1, 2 and 3.  */
        !           477: 
        !           478: #define CONST_OK_FOR_LETTER_P(VALUE, C)                                \
        !           479:   ((C) == 'I' ? (unsigned HOST_WIDE_INT) (VALUE) < 0x100       \
        !           480:    : (C) == 'J' ? (VALUE) == 0                                 \
        !           481:    : (C) == 'K' ? (unsigned HOST_WIDE_INT) ((VALUE) + 0x8000) < 0x10000        \
        !           482:    : (C) == 'L' ? (((VALUE) & 0xffff) == 0                     \
        !           483:                   && (((VALUE)) >> 31 == -1 || (VALUE) >> 31 == 0)) \
        !           484:    : (C) == 'M' ? zap_mask (VALUE)                             \
        !           485:    : (C) == 'N' ? (unsigned HOST_WIDE_INT) (~ (VALUE)) < 0x100 \
        !           486:    : (C) == 'O' ? (unsigned HOST_WIDE_INT) (- (VALUE)) < 0x100 \
        !           487:    : (C) == 'P' ? (VALUE) == 1 || (VALUE) == 2 || (VALUE) == 3 \
        !           488:    : 0)
        !           489: 
        !           490: /* Similar, but for floating or large integer constants, and defining letters
        !           491:    G and H.   Here VALUE is the CONST_DOUBLE rtx itself.
        !           492: 
        !           493:    For Alpha, `G' is the floating-point constant zero.  `H' is a CONST_DOUBLE
        !           494:    that is the operand of a ZAP insn.  */
        !           495: 
        !           496: #define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C)                         \
        !           497:   ((C) == 'G' ? (GET_MODE_CLASS (GET_MODE (VALUE)) == MODE_FLOAT       \
        !           498:                 && (VALUE) == CONST0_RTX (GET_MODE (VALUE)))           \
        !           499:    : (C) == 'H' ? (GET_MODE (VALUE) == VOIDmode                                \
        !           500:                   && zap_mask (CONST_DOUBLE_LOW (VALUE))               \
        !           501:                   && zap_mask (CONST_DOUBLE_HIGH (VALUE)))             \
        !           502:    : 0)
        !           503: 
        !           504: /* Optional extra constraints for this machine.
        !           505: 
        !           506:    For the Alpha, `Q' means that this is a memory operand but not a
        !           507:    reference to an unaligned location.  */
        !           508: 
        !           509: #define EXTRA_CONSTRAINT(OP, C)                                \
        !           510:   ((C) == 'Q' ? GET_CODE (OP) == MEM && GET_CODE (XEXP (OP, 0)) != AND \
        !           511:    : 0)
        !           512: 
        !           513: /* Given an rtx X being reloaded into a reg required to be
        !           514:    in class CLASS, return the class of reg to actually use.
        !           515:    In general this is just CLASS; but on some machines
        !           516:    in some cases it is preferable to use a more restrictive class.
        !           517: 
        !           518:    On the Alpha, all constants except zero go into a floating-point
        !           519:    register via memory.  */
        !           520: 
        !           521: #define PREFERRED_RELOAD_CLASS(X, CLASS)               \
        !           522:   (CONSTANT_P (X) && (X) != const0_rtx && (X) != CONST0_RTX (GET_MODE (X)) \
        !           523:    ? ((CLASS) == FLOAT_REGS ? NO_REGS : GENERAL_REGS)                  \
        !           524:    : (CLASS))
        !           525: 
        !           526: /* Loading and storing HImode or QImode values to and from memory
        !           527:    usually requires a scratch register.  The exceptions are loading
        !           528:    QImode and HImode from an aligned address to a general register. 
        !           529:    We also cannot load an unaligned address into an FP register.  */
        !           530: 
        !           531: #define SECONDARY_INPUT_RELOAD_CLASS(CLASS,MODE,IN)                    \
        !           532: (((GET_CODE (IN) == MEM                                                \
        !           533:    || (GET_CODE (IN) == REG && REGNO (IN) >= FIRST_PSEUDO_REGISTER)    \
        !           534:    || (GET_CODE (IN) == SUBREG                                         \
        !           535:        && (GET_CODE (SUBREG_REG (IN)) == MEM                           \
        !           536:           || (GET_CODE (SUBREG_REG (IN)) == REG                        \
        !           537:               && REGNO (SUBREG_REG (IN)) >= FIRST_PSEUDO_REGISTER))))  \
        !           538:   && (((CLASS) == FLOAT_REGS                                           \
        !           539:        && ((MODE) == SImode || (MODE) == HImode || (MODE) == QImode))  \
        !           540:       || (((MODE) == QImode || (MODE) == HImode)                       \
        !           541:          && unaligned_memory_operand (IN, MODE))))                     \
        !           542:  ? GENERAL_REGS                                                                \
        !           543:  : ((CLASS) == FLOAT_REGS && GET_CODE (IN) == MEM                      \
        !           544:     && GET_CODE (XEXP (IN, 0)) == AND) ? GENERAL_REGS                  \
        !           545:  : NO_REGS)
        !           546: 
        !           547: #define SECONDARY_OUTPUT_RELOAD_CLASS(CLASS,MODE,OUT)                  \
        !           548: (((GET_CODE (OUT) == MEM                                               \
        !           549:    || (GET_CODE (OUT) == REG && REGNO (OUT) >= FIRST_PSEUDO_REGISTER)  \
        !           550:    || (GET_CODE (OUT) == SUBREG                                                \
        !           551:        && (GET_CODE (SUBREG_REG (OUT)) == MEM                          \
        !           552:           || (GET_CODE (SUBREG_REG (OUT)) == REG                       \
        !           553:               && REGNO (SUBREG_REG (OUT)) >= FIRST_PSEUDO_REGISTER)))) \
        !           554:   && (((MODE) == HImode || (MODE) == QImode                            \
        !           555:        || ((MODE) == SImode && (CLASS) == FLOAT_REGS))))               \
        !           556:  ? GENERAL_REGS                                                                \
        !           557:  : ((CLASS) == FLOAT_REGS && GET_CODE (OUT) == MEM                     \
        !           558:     && GET_CODE (XEXP (OUT, 0)) == AND) ? GENERAL_REGS                 \
        !           559:   : NO_REGS)
        !           560: 
        !           561: /* If we are copying between general and FP registers, we need a memory
        !           562:    location.  */
        !           563: 
        !           564: #define SECONDARY_MEMORY_NEEDED(CLASS1,CLASS2,MODE) ((CLASS1) != (CLASS2))
        !           565: 
        !           566: /* Return the maximum number of consecutive registers
        !           567:    needed to represent mode MODE in a register of class CLASS.  */
        !           568: 
        !           569: #define CLASS_MAX_NREGS(CLASS, MODE)                           \
        !           570:  ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
        !           571: 
        !           572: /* Define the cost of moving between registers of various classes.  Moving
        !           573:    between FLOAT_REGS and anything else except float regs is expensive. 
        !           574:    In fact, we make it quite expensive because we really don't want to
        !           575:    do these moves unless it is clearly worth it.  Optimizations may
        !           576:    reduce the impact of not being able to allocate a pseudo to a
        !           577:    hard register.  */
        !           578: 
        !           579: #define REGISTER_MOVE_COST(CLASS1, CLASS2)     \
        !           580:   (((CLASS1) == FLOAT_REGS) == ((CLASS2) == FLOAT_REGS) ? 2 : 20)
        !           581: 
        !           582: /* A C expressions returning the cost of moving data of MODE from a register to
        !           583:    or from memory.
        !           584: 
        !           585:    On the Alpha, bump this up a bit.  */
        !           586: 
        !           587: #define MEMORY_MOVE_COST(MODE)  6
        !           588: 
        !           589: /* Provide the cost of a branch.  Exact meaning under development.  */
        !           590: #define BRANCH_COST 5
        !           591: 
        !           592: /* Adjust the cost of dependencies.  */
        !           593: 
        !           594: #define ADJUST_COST(INSN,LINK,DEP,COST) \
        !           595:   (COST) = alpha_adjust_cost (INSN, LINK, DEP, COST)
        !           596: 
        !           597: /* Stack layout; function entry, exit and calling.  */
        !           598: 
        !           599: /* Define this if pushing a word on the stack
        !           600:    makes the stack pointer a smaller address.  */
        !           601: #define STACK_GROWS_DOWNWARD
        !           602: 
        !           603: /* Define this if the nominal address of the stack frame
        !           604:    is at the high-address end of the local variables;
        !           605:    that is, each additional local variable allocated
        !           606:    goes at a more negative offset in the frame.  */
        !           607: /* #define FRAME_GROWS_DOWNWARD */
        !           608: 
        !           609: /* Offset within stack frame to start allocating local variables at.
        !           610:    If FRAME_GROWS_DOWNWARD, this is the offset to the END of the
        !           611:    first local allocated.  Otherwise, it is the offset to the BEGINNING
        !           612:    of the first local allocated.  */
        !           613: 
        !           614: #define STARTING_FRAME_OFFSET current_function_outgoing_args_size
        !           615: 
        !           616: /* If we generate an insn to push BYTES bytes,
        !           617:    this says how many the stack pointer really advances by.
        !           618:    On Alpha, don't define this because there are no push insns.  */
        !           619: /*  #define PUSH_ROUNDING(BYTES) */
        !           620: 
        !           621: /* Define this if the maximum size of all the outgoing args is to be
        !           622:    accumulated and pushed during the prologue.  The amount can be
        !           623:    found in the variable current_function_outgoing_args_size.  */
        !           624: #define ACCUMULATE_OUTGOING_ARGS
        !           625: 
        !           626: /* Offset of first parameter from the argument pointer register value.  */
        !           627: 
        !           628: #define FIRST_PARM_OFFSET(FNDECL) 0
        !           629: 
        !           630: /* Definitions for register eliminations.
        !           631: 
        !           632:    We have two registers that can be eliminated on the Alpha.  First, the
        !           633:    frame pointer register can often be eliminated in favor of the stack
        !           634:    pointer register.  Secondly, the argument pointer register can always be
        !           635:    eliminated; it is replaced with either the stack or frame pointer. */
        !           636: 
        !           637: /* This is an array of structures.  Each structure initializes one pair
        !           638:    of eliminable registers.  The "from" register number is given first,
        !           639:    followed by "to".  Eliminations of the same "from" register are listed
        !           640:    in order of preference.  */
        !           641: 
        !           642: #define ELIMINABLE_REGS                                \
        !           643: {{ ARG_POINTER_REGNUM, STACK_POINTER_REGNUM},  \
        !           644:  { ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM},   \
        !           645:  { FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}
        !           646: 
        !           647: /* Given FROM and TO register numbers, say whether this elimination is allowed.
        !           648:    Frame pointer elimination is automatically handled.
        !           649: 
        !           650:    All eliminations are valid since the cases where FP can't be
        !           651:    eliminated are already handled.  */
        !           652: 
        !           653: #define CAN_ELIMINATE(FROM, TO) 1
        !           654: 
        !           655: /* Define the offset between two registers, one to be eliminated, and the other
        !           656:    its replacement, at the start of a routine.  */
        !           657: #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET)                   \
        !           658: { if ((FROM) == FRAME_POINTER_REGNUM && (TO) == STACK_POINTER_REGNUM)  \
        !           659:     (OFFSET) = 0;                                                      \
        !           660:   else                                                                 \
        !           661:     {                                                                  \
        !           662:       (OFFSET) = ((get_frame_size () + current_function_outgoing_args_size \
        !           663:                   + current_function_pretend_args_size                 \
        !           664:                   + alpha_sa_size () + 15)                             \
        !           665:                  & ~ 15);                                              \
        !           666:       if ((FROM) == ARG_POINTER_REGNUM)                                        \
        !           667:        (OFFSET) -= current_function_pretend_args_size;                 \
        !           668:     }                                                                  \
        !           669: }
        !           670: 
        !           671: /* Define this if stack space is still allocated for a parameter passed
        !           672:    in a register.  */
        !           673: /* #define REG_PARM_STACK_SPACE */
        !           674: 
        !           675: /* Value is the number of bytes of arguments automatically
        !           676:    popped when returning from a subroutine call.
        !           677:    FUNTYPE is the data type of the function (as a tree),
        !           678:    or for a library call it is an identifier node for the subroutine name.
        !           679:    SIZE is the number of bytes of arguments passed on the stack.  */
        !           680: 
        !           681: #define RETURN_POPS_ARGS(FUNTYPE,SIZE) 0
        !           682: 
        !           683: /* Define how to find the value returned by a function.
        !           684:    VALTYPE is the data type of the value (as a tree).
        !           685:    If the precise function being called is known, FUNC is its FUNCTION_DECL;
        !           686:    otherwise, FUNC is 0.
        !           687: 
        !           688:    On Alpha the value is found in $0 for integer functions and
        !           689:    $f0 for floating-point functions.  */
        !           690: 
        !           691: #define FUNCTION_VALUE(VALTYPE, FUNC)  \
        !           692:   gen_rtx (REG,                                                \
        !           693:           ((TREE_CODE (VALTYPE) == INTEGER_TYPE        \
        !           694:             || TREE_CODE (VALTYPE) == ENUMERAL_TYPE    \
        !           695:             || TREE_CODE (VALTYPE) == BOOLEAN_TYPE     \
        !           696:             || TREE_CODE (VALTYPE) == CHAR_TYPE        \
        !           697:             || TREE_CODE (VALTYPE) == POINTER_TYPE     \
        !           698:             || TREE_CODE (VALTYPE) == OFFSET_TYPE)     \
        !           699:            && TYPE_PRECISION (VALTYPE) < BITS_PER_WORD) \
        !           700:           ? word_mode : TYPE_MODE (VALTYPE),           \
        !           701:           TARGET_FPREGS && TREE_CODE (VALTYPE) == REAL_TYPE ? 32 : 0)
        !           702: 
        !           703: /* Define how to find the value returned by a library function
        !           704:    assuming the value has mode MODE.  */
        !           705: 
        !           706: #define LIBCALL_VALUE(MODE)    \
        !           707:    gen_rtx (REG, MODE,         \
        !           708:            TARGET_FPREGS && GET_MODE_CLASS (MODE) == MODE_FLOAT ? 32 : 0)
        !           709: 
        !           710: /* The definition of this macro implies that there are cases where
        !           711:    a scalar value cannot be returned in registers.
        !           712: 
        !           713:    For the Alpha, any structure or union type is returned in memory, as
        !           714:    are integers whose size is larger than 64 bits.  */
        !           715: 
        !           716: #define RETURN_IN_MEMORY(TYPE) \
        !           717:   (TYPE_MODE (TYPE) == BLKmode \
        !           718:    || (TREE_CODE (TYPE) == INTEGER_TYPE && TYPE_PRECISION (TYPE) > 64))
        !           719: 
        !           720: /* 1 if N is a possible register number for a function value
        !           721:    as seen by the caller.  */
        !           722: 
        !           723: #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0 || (N) == 32)
        !           724: 
        !           725: /* 1 if N is a possible register number for function argument passing.
        !           726:    On Alpha, these are $16-$21 and $f16-$f21.  */
        !           727: 
        !           728: #define FUNCTION_ARG_REGNO_P(N) \
        !           729:   (((N) >= 16 && (N) <= 21) || ((N) >= 16 + 32 && (N) <= 21 + 32))
        !           730: 
        !           731: /* Define a data type for recording info about an argument list
        !           732:    during the scan of that argument list.  This data type should
        !           733:    hold all necessary information about the function itself
        !           734:    and about the args processed so far, enough to enable macros
        !           735:    such as FUNCTION_ARG to determine where the next arg should go.
        !           736: 
        !           737:    On Alpha, this is a single integer, which is a number of words
        !           738:    of arguments scanned so far.
        !           739:    Thus 6 or more means all following args should go on the stack.  */
        !           740: 
        !           741: #define CUMULATIVE_ARGS int
        !           742: 
        !           743: /* Initialize a variable CUM of type CUMULATIVE_ARGS
        !           744:    for a call to a function whose data type is FNTYPE.
        !           745:    For a library call, FNTYPE is 0.  */
        !           746: 
        !           747: #define INIT_CUMULATIVE_ARGS(CUM,FNTYPE,LIBNAME)  (CUM) = 0
        !           748: 
        !           749: /* Define intermediate macro to compute the size (in registers) of an argument
        !           750:    for the Alpha.  */
        !           751: 
        !           752: #define ALPHA_ARG_SIZE(MODE, TYPE, NAMED)                              \
        !           753: ((MODE) != BLKmode                                                     \
        !           754:  ? (GET_MODE_SIZE (MODE) + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD      \
        !           755:  : (int_size_in_bytes (TYPE) + (UNITS_PER_WORD - 1)) / UNITS_PER_WORD)
        !           756: 
        !           757: /* Update the data in CUM to advance over an argument
        !           758:    of mode MODE and data type TYPE.
        !           759:    (TYPE is null for libcalls where that information may not be available.)  */
        !           760: 
        !           761: #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED)                   \
        !           762:   if (MUST_PASS_IN_STACK (MODE, TYPE))                                 \
        !           763:     (CUM) = 6;                                                         \
        !           764:   else                                                                 \
        !           765:     (CUM) += ALPHA_ARG_SIZE (MODE, TYPE, NAMED)
        !           766: 
        !           767: /* Determine where to put an argument to a function.
        !           768:    Value is zero to push the argument on the stack,
        !           769:    or a hard register in which to store the argument.
        !           770: 
        !           771:    MODE is the argument's machine mode.
        !           772:    TYPE is the data type of the argument (as a tree).
        !           773:     This is null for libcalls where that information may
        !           774:     not be available.
        !           775:    CUM is a variable of type CUMULATIVE_ARGS which gives info about
        !           776:     the preceding args and about the function being called.
        !           777:    NAMED is nonzero if this argument is a named parameter
        !           778:     (otherwise it is an extra parameter matching an ellipsis).
        !           779: 
        !           780:    On Alpha the first 6 words of args are normally in registers
        !           781:    and the rest are pushed.  */
        !           782: 
        !           783: #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED)   \
        !           784: ((CUM) < 6 && ! MUST_PASS_IN_STACK (MODE, TYPE)        \
        !           785:  ? gen_rtx(REG, (MODE),                                \
        !           786:           (CUM) + 16 + (TARGET_FPREGS          \
        !           787:                         && GET_MODE_CLASS (MODE) == MODE_FLOAT) * 32) : 0)
        !           788: 
        !           789: /* Specify the padding direction of arguments.
        !           790: 
        !           791:    On the Alpha, we must pad upwards in order to be able to pass args in
        !           792:    registers.  */
        !           793: 
        !           794: #define FUNCTION_ARG_PADDING(MODE, TYPE)       upward
        !           795: 
        !           796: /* For an arg passed partly in registers and partly in memory,
        !           797:    this is the number of registers used.
        !           798:    For args passed entirely in registers or entirely in memory, zero.  */
        !           799: 
        !           800: #define FUNCTION_ARG_PARTIAL_NREGS(CUM, MODE, TYPE, NAMED)     \
        !           801: ((CUM) < 6 && 6 < (CUM) + ALPHA_ARG_SIZE (MODE, TYPE, NAMED)   \
        !           802:  ? 6 - (CUM) : 0)
        !           803: 
        !           804: /* Perform any needed actions needed for a function that is receiving a
        !           805:    variable number of arguments. 
        !           806: 
        !           807:    CUM is as above.
        !           808: 
        !           809:    MODE and TYPE are the mode and type of the current parameter.
        !           810: 
        !           811:    PRETEND_SIZE is a variable that should be set to the amount of stack
        !           812:    that must be pushed by the prolog to pretend that our caller pushed
        !           813:    it.
        !           814: 
        !           815:    Normally, this macro will push all remaining incoming registers on the
        !           816:    stack and set PRETEND_SIZE to the length of the registers pushed. 
        !           817: 
        !           818:    On the Alpha, we allocate space for all 12 arg registers, but only
        !           819:    push those that are remaining.
        !           820: 
        !           821:    However, if NO registers need to be saved, don't allocate any space.
        !           822:    This is not only because we won't need the space, but because AP includes
        !           823:    the current_pretend_args_size and we don't want to mess up any
        !           824:    ap-relative addresses already made.
        !           825: 
        !           826:    If we are not to use the floating-point registers, save the integer
        !           827:    registers where we would put the floating-point registers.  This is
        !           828:    not the most efficient way to implement varargs with just one register
        !           829:    class, but it isn't worth doing anything more efficient in this rare
        !           830:    case.  */
        !           831:    
        !           832: 
        !           833: #define SETUP_INCOMING_VARARGS(CUM,MODE,TYPE,PRETEND_SIZE,NO_RTL)      \
        !           834: { if ((CUM) < 6)                                                       \
        !           835:     {                                                                  \
        !           836:       if (! (NO_RTL))                                                  \
        !           837:        {                                                               \
        !           838:          move_block_from_reg                                           \
        !           839:            (16 + CUM,                                                  \
        !           840:             gen_rtx (MEM, BLKmode,                                     \
        !           841:                      plus_constant (virtual_incoming_args_rtx,         \
        !           842:                                     ((CUM) + 6)* UNITS_PER_WORD)),     \
        !           843:             6 - (CUM), (6 - (CUM)) * UNITS_PER_WORD);                  \
        !           844:          move_block_from_reg                                           \
        !           845:            (16 + (TARGET_FPREGS ? 32 : 0) + CUM,                       \
        !           846:             gen_rtx (MEM, BLKmode,                                     \
        !           847:                      plus_constant (virtual_incoming_args_rtx,         \
        !           848:                                     (CUM) * UNITS_PER_WORD)),          \
        !           849:             6 - (CUM), (6 - (CUM)) * UNITS_PER_WORD);                  \
        !           850:         }                                                              \
        !           851:       PRETEND_SIZE = 12 * UNITS_PER_WORD;                              \
        !           852:     }                                                                  \
        !           853: }
        !           854: 
        !           855: /* Generate necessary RTL for __builtin_saveregs().
        !           856:    ARGLIST is the argument list; see expr.c.  */
        !           857: extern struct rtx_def *alpha_builtin_saveregs ();
        !           858: #define EXPAND_BUILTIN_SAVEREGS(ARGLIST) alpha_builtin_saveregs (ARGLIST)
        !           859: 
        !           860: /* Define the information needed to generate branch and scc insns.  This is
        !           861:    stored from the compare operation.  Note that we can't use "rtx" here
        !           862:    since it hasn't been defined!  */
        !           863: 
        !           864: extern struct rtx_def *alpha_compare_op0, *alpha_compare_op1;
        !           865: extern int alpha_compare_fp_p;
        !           866: 
        !           867: /* This macro produces the initial definition of a function name.  On the
        !           868:    Alpha, we need to save the function name for the prologue and epilogue.  */
        !           869: 
        !           870: extern char *alpha_function_name;
        !           871: 
        !           872: #define ASM_DECLARE_FUNCTION_NAME(FILE,NAME,DECL)      \
        !           873: {                                                      \
        !           874:    alpha_function_name = NAME;                         \
        !           875: }
        !           876:    
        !           877: /* This macro generates the assembly code for function entry.
        !           878:    FILE is a stdio stream to output the code to.
        !           879:    SIZE is an int: how many units of temporary storage to allocate.
        !           880:    Refer to the array `regs_ever_live' to determine which registers
        !           881:    to save; `regs_ever_live[I]' is nonzero if register number I
        !           882:    is ever used in the function.  This macro is responsible for
        !           883:    knowing which registers should not be saved even if used.  */
        !           884: 
        !           885: #define FUNCTION_PROLOGUE(FILE, SIZE)  output_prolog (FILE, SIZE)
        !           886: 
        !           887: /* Output assembler code to FILE to increment profiler label # LABELNO
        !           888:    for profiling a function entry.  */
        !           889: 
        !           890: #define FUNCTION_PROFILER(FILE, LABELNO)
        !           891: 
        !           892: /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
        !           893:    the stack pointer does not matter.  The value is tested only in
        !           894:    functions that have frame pointers.
        !           895:    No definition is equivalent to always zero.  */
        !           896: 
        !           897: #define EXIT_IGNORE_STACK 1
        !           898: 
        !           899: /* This macro generates the assembly code for function exit,
        !           900:    on machines that need it.  If FUNCTION_EPILOGUE is not defined
        !           901:    then individual return instructions are generated for each
        !           902:    return statement.  Args are same as for FUNCTION_PROLOGUE.
        !           903: 
        !           904:    The function epilogue should not depend on the current stack pointer!
        !           905:    It should use the frame pointer only.  This is mandatory because
        !           906:    of alloca; we also take advantage of it to omit stack adjustments
        !           907:    before returning.  */
        !           908: 
        !           909: #define FUNCTION_EPILOGUE(FILE, SIZE)  output_epilog (FILE, SIZE)
        !           910: 
        !           911: 
        !           912: /* Output assembler code for a block containing the constant parts
        !           913:    of a trampoline, leaving space for the variable parts.
        !           914: 
        !           915:    The trampoline should set the static chain pointer to value placed
        !           916:    into the trampoline and should branch to the specified routine.  
        !           917:    Note that $27 has been set to the address of the trampoline, so we can
        !           918:    use it for addressability of the two data items.  Trampolines are always
        !           919:    aligned to FUNCTION_BOUNDARY, which is 64 bits.  */
        !           920: 
        !           921: #define TRAMPOLINE_TEMPLATE(FILE)              \
        !           922: {                                              \
        !           923:   fprintf (FILE, "\tldq $1,24($27)\n");                \
        !           924:   fprintf (FILE, "\tldq $27,16($27)\n");       \
        !           925:   fprintf (FILE, "\tjmp $31,($27),0\n");       \
        !           926:   fprintf (FILE, "\tnop\n");                   \
        !           927:   fprintf (FILE, "\t.quad 0,0\n");             \
        !           928: }
        !           929: 
        !           930: /* Section in which to place the trampoline.  On Alpha, instructions
        !           931:    may only be placed in a text segment.  */
        !           932: 
        !           933: #define TRAMPOLINE_SECTION text_section
        !           934: 
        !           935: /* Length in units of the trampoline for entering a nested function.  */
        !           936: 
        !           937: #define TRAMPOLINE_SIZE    32
        !           938: 
        !           939: /* Emit RTL insns to initialize the variable parts of a trampoline.
        !           940:    FNADDR is an RTX for the address of the function's pure code.
        !           941:    CXT is an RTX for the static chain value for the function.  We assume
        !           942:    here that a function will be called many more times than its address
        !           943:    is taken (e.g., it might be passed to qsort), so we take the trouble 
        !           944:    to initialize the "hint" field in the JMP insn.  Note that the hint
        !           945:    field is PC (new) + 4 * bits 13:0.  */
        !           946: 
        !           947: #define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT)                      \
        !           948: {                                                                      \
        !           949:   rtx _temp, _temp1, _addr;                                            \
        !           950:                                                                        \
        !           951:   _addr = memory_address (Pmode, plus_constant ((TRAMP), 16));         \
        !           952:   emit_move_insn (gen_rtx (MEM, Pmode, _addr), (FNADDR));              \
        !           953:   _addr = memory_address (Pmode, plus_constant ((TRAMP), 24));         \
        !           954:   emit_move_insn (gen_rtx (MEM, Pmode, _addr), (CXT));                 \
        !           955:                                                                        \
        !           956:   _temp = force_operand (plus_constant ((TRAMP), 12), NULL_RTX);       \
        !           957:   _temp = expand_binop (DImode, sub_optab, (FNADDR), _temp, _temp, 1,  \
        !           958:                        OPTAB_WIDEN);                                   \
        !           959:   _temp = expand_shift (RSHIFT_EXPR, Pmode, _temp,                     \
        !           960:                        build_int_2 (2, 0), NULL_RTX, 1);               \
        !           961:   _temp = expand_and (gen_lowpart (SImode, _temp),                     \
        !           962:                      GEN_INT (0x3fff), 0);                             \
        !           963:                                                                        \
        !           964:   _addr = memory_address (SImode, plus_constant ((TRAMP), 8));         \
        !           965:   _temp1 = force_reg (SImode, gen_rtx (MEM, SImode, _addr));           \
        !           966:   _temp1 = expand_and (_temp1, GEN_INT (0xffffc000), NULL_RTX);                \
        !           967:   _temp1 = expand_binop (SImode, ior_optab, _temp1, _temp, _temp1, 1,  \
        !           968:                         OPTAB_WIDEN);                                  \
        !           969:                                                                        \
        !           970:   emit_move_insn (gen_rtx (MEM, SImode, _addr), _temp1);               \
        !           971:                                                                        \
        !           972:   emit_library_call (gen_rtx (SYMBOL_REF, Pmode,                       \
        !           973:                              "__enable_execute_stack"),                \
        !           974:                     0, VOIDmode, 1,_addr, Pmode);                      \
        !           975:                                                                        \
        !           976:   emit_insn (gen_rtx (UNSPEC_VOLATILE, VOIDmode,                       \
        !           977:                      gen_rtvec (1, const0_rtx), 0));                   \
        !           978: }
        !           979: 
        !           980: /* Attempt to turn on access permissions for the stack.  */
        !           981: 
        !           982: #define TRANSFER_FROM_TRAMPOLINE                                       \
        !           983:                                                                        \
        !           984: void                                                                   \
        !           985: __enable_execute_stack (addr)                                          \
        !           986:      void *addr;                                                       \
        !           987: {                                                                      \
        !           988:   long size = getpagesize ();                                          \
        !           989:   long mask = ~(size-1);                                               \
        !           990:   char *page = (char *) (((long) addr) & mask);                                \
        !           991:   char *end  = (char *) ((((long) (addr + TRAMPOLINE_SIZE)) & mask) + size); \
        !           992:                                                                        \
        !           993:   /* 7 is PROT_READ | PROT_WRITE | PROT_EXEC */                                \
        !           994:   if (mprotect (page, end - page, 7) < 0)                              \
        !           995:     perror ("mprotect of trampoline code");                            \
        !           996: }
        !           997: 
        !           998: /* Addressing modes, and classification of registers for them.  */
        !           999: 
        !          1000: /* #define HAVE_POST_INCREMENT */
        !          1001: /* #define HAVE_POST_DECREMENT */
        !          1002: 
        !          1003: /* #define HAVE_PRE_DECREMENT */
        !          1004: /* #define HAVE_PRE_INCREMENT */
        !          1005: 
        !          1006: /* Macros to check register numbers against specific register classes.  */
        !          1007: 
        !          1008: /* These assume that REGNO is a hard or pseudo reg number.
        !          1009:    They give nonzero only if REGNO is a hard reg of the suitable class
        !          1010:    or a pseudo reg currently allocated to a suitable hard reg.
        !          1011:    Since they use reg_renumber, they are safe only once reg_renumber
        !          1012:    has been allocated, which happens in local-alloc.c.  */
        !          1013: 
        !          1014: #define REGNO_OK_FOR_INDEX_P(REGNO) 0
        !          1015: #define REGNO_OK_FOR_BASE_P(REGNO) \
        !          1016: (((REGNO) < 32 || (unsigned) reg_renumber[REGNO] < 32))
        !          1017: 
        !          1018: /* Maximum number of registers that can appear in a valid memory address.  */
        !          1019: #define MAX_REGS_PER_ADDRESS 1
        !          1020: 
        !          1021: /* Recognize any constant value that is a valid address.  For the Alpha,
        !          1022:    there are only constants none since we want to use LDA to load any
        !          1023:    symbolic addresses into registers.  */
        !          1024: 
        !          1025: #define CONSTANT_ADDRESS_P(X)   \
        !          1026:   (GET_CODE (X) == CONST_INT   \
        !          1027:    && (unsigned HOST_WIDE_INT) (INTVAL (X) + 0x8000) < 0x10000)
        !          1028: 
        !          1029: /* Include all constant integers and constant doubles, but not
        !          1030:    floating-point, except for floating-point zero.  */
        !          1031: 
        !          1032: #define LEGITIMATE_CONSTANT_P(X)               \
        !          1033:   (GET_MODE_CLASS (GET_MODE (X)) != MODE_FLOAT \
        !          1034:    || (X) == CONST0_RTX (GET_MODE (X)))
        !          1035: 
        !          1036: /* The macros REG_OK_FOR..._P assume that the arg is a REG rtx
        !          1037:    and check its validity for a certain class.
        !          1038:    We have two alternate definitions for each of them.
        !          1039:    The usual definition accepts all pseudo regs; the other rejects
        !          1040:    them unless they have been allocated suitable hard regs.
        !          1041:    The symbol REG_OK_STRICT causes the latter definition to be used.
        !          1042: 
        !          1043:    Most source files want to accept pseudo regs in the hope that
        !          1044:    they will get allocated to the class that the insn wants them to be in.
        !          1045:    Source files for reload pass need to be strict.
        !          1046:    After reload, it makes no difference, since pseudo regs have
        !          1047:    been eliminated by then.  */
        !          1048: 
        !          1049: #ifndef REG_OK_STRICT
        !          1050: 
        !          1051: /* Nonzero if X is a hard reg that can be used as an index
        !          1052:    or if it is a pseudo reg.  */
        !          1053: #define REG_OK_FOR_INDEX_P(X) 0
        !          1054: /* Nonzero if X is a hard reg that can be used as a base reg
        !          1055:    or if it is a pseudo reg.  */
        !          1056: #define REG_OK_FOR_BASE_P(X)  \
        !          1057:   (REGNO (X) < 32 || REGNO (X) >= FIRST_PSEUDO_REGISTER)
        !          1058: 
        !          1059: #else
        !          1060: 
        !          1061: /* Nonzero if X is a hard reg that can be used as an index.  */
        !          1062: #define REG_OK_FOR_INDEX_P(X) REGNO_OK_FOR_INDEX_P (REGNO (X))
        !          1063: /* Nonzero if X is a hard reg that can be used as a base reg.  */
        !          1064: #define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
        !          1065: 
        !          1066: #endif
        !          1067: 
        !          1068: /* GO_IF_LEGITIMATE_ADDRESS recognizes an RTL expression
        !          1069:    that is a valid memory address for an instruction.
        !          1070:    The MODE argument is the machine mode for the MEM expression
        !          1071:    that wants to use this address. 
        !          1072: 
        !          1073:    For Alpha, we have either a constant address or the sum of a register
        !          1074:    and a constant address, or just a register.  For DImode, any of those
        !          1075:    forms can be surrounded with an AND that clear the low-order three bits;
        !          1076:    this is an "unaligned" access.
        !          1077: 
        !          1078:    We also allow a SYMBOL_REF that is the name of the current function as
        !          1079:    valid address.  This is for CALL_INSNs.  It cannot be used in any other
        !          1080:    context.
        !          1081: 
        !          1082:    First define the basic valid address.  */
        !          1083: 
        !          1084: #define GO_IF_LEGITIMATE_SIMPLE_ADDRESS(MODE, X, ADDR) \
        !          1085: { if (REG_P (X) && REG_OK_FOR_BASE_P (X))      \
        !          1086:     goto ADDR;                                 \
        !          1087:   if (CONSTANT_ADDRESS_P (X))                  \
        !          1088:     goto ADDR;                                 \
        !          1089:   if (GET_CODE (X) == PLUS                     \
        !          1090:       && REG_P (XEXP (X, 0))                   \
        !          1091:       && REG_OK_FOR_BASE_P (XEXP (X, 0))       \
        !          1092:       && CONSTANT_ADDRESS_P (XEXP (X, 1)))     \
        !          1093:     goto ADDR;                                 \
        !          1094: }
        !          1095: 
        !          1096: /* Now accept the simple address, or, for DImode only, an AND of a simple
        !          1097:    address that turns off the low three bits.  */
        !          1098: 
        !          1099: extern char *current_function_name;
        !          1100: 
        !          1101: #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, ADDR) \
        !          1102: { GO_IF_LEGITIMATE_SIMPLE_ADDRESS (MODE, X, ADDR); \
        !          1103:   if ((MODE) == DImode                         \
        !          1104:       && GET_CODE (X) == AND                   \
        !          1105:       && GET_CODE (XEXP (X, 1)) == CONST_INT   \
        !          1106:       && INTVAL (XEXP (X, 1)) == -8)           \
        !          1107:     GO_IF_LEGITIMATE_SIMPLE_ADDRESS (MODE, XEXP (X, 0), ADDR); \
        !          1108:   if ((MODE) == Pmode && GET_CODE (X) == SYMBOL_REF    \
        !          1109:       && ! strcmp (XSTR (X, 0), current_function_name))        \
        !          1110:     goto ADDR;                                 \
        !          1111: }
        !          1112: 
        !          1113: /* Try machine-dependent ways of modifying an illegitimate address
        !          1114:    to be legitimate.  If we find one, return the new, valid address.
        !          1115:    This macro is used in only one place: `memory_address' in explow.c.
        !          1116: 
        !          1117:    OLDX is the address as it was before break_out_memory_refs was called.
        !          1118:    In some cases it is useful to look at this to decide what needs to be done.
        !          1119: 
        !          1120:    MODE and WIN are passed so that this macro can use
        !          1121:    GO_IF_LEGITIMATE_ADDRESS.
        !          1122: 
        !          1123:    It is always safe for this macro to do nothing.  It exists to recognize
        !          1124:    opportunities to optimize the output. 
        !          1125: 
        !          1126:    For the Alpha, there are three cases we handle:
        !          1127: 
        !          1128:    (1) If the address is (plus reg const_int) and the CONST_INT is not a
        !          1129:        valid offset, compute the high part of the constant and add it to the
        !          1130:        register.  Then our address is (plus temp low-part-const).
        !          1131:    (2) If the address is (const (plus FOO const_int)), find the low-order
        !          1132:        part of the CONST_INT.  Then load FOO plus any high-order part of the
        !          1133:        CONST_INT into a register.  Our address is (plus reg low-part-const).
        !          1134:        This is done to reduce the number of GOT entries.
        !          1135:    (3) If we have a (plus reg const), emit the load as in (2), then add
        !          1136:        the two registers, and finally generate (plus reg low-part-const) as
        !          1137:        our address.  */
        !          1138: 
        !          1139: #define LEGITIMIZE_ADDRESS(X,OLDX,MODE,WIN)                    \
        !          1140: { if (GET_CODE (X) == PLUS && GET_CODE (XEXP (X, 0)) == REG    \
        !          1141:       && GET_CODE (XEXP (X, 1)) == CONST_INT                   \
        !          1142:       && ! CONSTANT_ADDRESS_P (XEXP (X, 1)))                   \
        !          1143:     {                                                          \
        !          1144:       HOST_WIDE_INT val = INTVAL (XEXP (X, 1));                        \
        !          1145:       HOST_WIDE_INT lowpart = (val & 0xffff) - 2 * (val & 0x8000); \
        !          1146:       HOST_WIDE_INT highpart = val - lowpart;                  \
        !          1147:       rtx high = GEN_INT (highpart);                           \
        !          1148:       rtx temp = expand_binop (Pmode, add_optab, XEXP (x, 0),  \
        !          1149:                               high, NULL_RTX, 1, OPTAB_LIB_WIDEN); \
        !          1150:                                                                \
        !          1151:       (X) = plus_constant (temp, lowpart);                     \
        !          1152:       goto WIN;                                                        \
        !          1153:     }                                                          \
        !          1154:   else if (GET_CODE (X) == CONST                               \
        !          1155:           && GET_CODE (XEXP (X, 0)) == PLUS                    \
        !          1156:           && GET_CODE (XEXP (XEXP (X, 0), 1)) == CONST_INT)    \
        !          1157:     {                                                          \
        !          1158:       HOST_WIDE_INT val = INTVAL (XEXP (XEXP (X, 0), 1));      \
        !          1159:       HOST_WIDE_INT lowpart = (val & 0xffff) - 2 * (val & 0x8000); \
        !          1160:       HOST_WIDE_INT highpart = val - lowpart;                  \
        !          1161:       rtx high = XEXP (XEXP (X, 0), 0);                                \
        !          1162:                                                                \
        !          1163:       if (highpart)                                            \
        !          1164:        high = plus_constant (high, highpart);                  \
        !          1165:                                                                \
        !          1166:       (X) = plus_constant (force_reg (Pmode, high), lowpart);  \
        !          1167:       goto WIN;                                                        \
        !          1168:     }                                                          \
        !          1169:   else if (GET_CODE (X) == PLUS && GET_CODE (XEXP (X, 0)) == REG \
        !          1170:           && GET_CODE (XEXP (X, 1)) == CONST                   \
        !          1171:           && GET_CODE (XEXP (XEXP (X, 1), 0)) == PLUS          \
        !          1172:           && GET_CODE (XEXP (XEXP (XEXP (X, 1), 0), 1)) == CONST_INT) \
        !          1173:     {                                                          \
        !          1174:       HOST_WIDE_INT val = INTVAL (XEXP (XEXP (XEXP (X, 1), 0), 1)); \
        !          1175:       HOST_WIDE_INT lowpart = (val & 0xffff) - 2 * (val & 0x8000); \
        !          1176:       HOST_WIDE_INT highpart = val - lowpart;                  \
        !          1177:       rtx high = XEXP (XEXP (XEXP (X, 1), 0), 0);              \
        !          1178:                                                                \
        !          1179:       if (highpart)                                            \
        !          1180:        high = plus_constant (high, highpart);                  \
        !          1181:                                                                \
        !          1182:       high = expand_binop (Pmode, add_optab, XEXP (X, 0),      \
        !          1183:                           force_reg (Pmode, high),             \
        !          1184:                           high, 1, OPTAB_LIB_WIDEN);           \
        !          1185:       (X) = plus_constant (high, lowpart);                     \
        !          1186:       goto WIN;                                                        \
        !          1187:     }                                                          \
        !          1188: }
        !          1189: 
        !          1190: /* Go to LABEL if ADDR (a legitimate address expression)
        !          1191:    has an effect that depends on the machine mode it is used for.
        !          1192:    On the Alpha this is true only for the unaligned modes.   We can
        !          1193:    simplify this test since we know that the address must be valid.  */
        !          1194: 
        !          1195: #define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR,LABEL)  \
        !          1196: { if (GET_CODE (ADDR) == AND) goto LABEL; }
        !          1197: 
        !          1198: /* Compute the cost of an address.  For the Alpha, all valid addresses are
        !          1199:    the same cost.  */
        !          1200: 
        !          1201: #define ADDRESS_COST(X)  0
        !          1202: 
        !          1203: /* Define this if some processing needs to be done immediately before
        !          1204:    emitting code for an insn.  */
        !          1205: 
        !          1206: /* #define FINAL_PRESCAN_INSN(INSN,OPERANDS,NOPERANDS) */
        !          1207: 
        !          1208: /* Specify the machine mode that this machine uses
        !          1209:    for the index in the tablejump instruction.  */
        !          1210: #define CASE_VECTOR_MODE SImode
        !          1211: 
        !          1212: /* Define this if the tablejump instruction expects the table
        !          1213:    to contain offsets from the address of the table.
        !          1214:    Do not define this if the table should contain absolute addresses.  */
        !          1215: /* #define CASE_VECTOR_PC_RELATIVE */
        !          1216: 
        !          1217: /* Specify the tree operation to be used to convert reals to integers.  */
        !          1218: #define IMPLICIT_FIX_EXPR FIX_ROUND_EXPR
        !          1219: 
        !          1220: /* This is the kind of divide that is easiest to do in the general case.  */
        !          1221: #define EASY_DIV_EXPR TRUNC_DIV_EXPR
        !          1222: 
        !          1223: /* Define this as 1 if `char' should by default be signed; else as 0.  */
        !          1224: #define DEFAULT_SIGNED_CHAR 1
        !          1225: 
        !          1226: /* This flag, if defined, says the same insns that convert to a signed fixnum
        !          1227:    also convert validly to an unsigned one.
        !          1228: 
        !          1229:    We actually lie a bit here as overflow conditions are different.  But
        !          1230:    they aren't being checked anyway.  */
        !          1231: 
        !          1232: #define FIXUNS_TRUNC_LIKE_FIX_TRUNC
        !          1233: 
        !          1234: /* Max number of bytes we can move to or from memory
        !          1235:    in one reasonably fast instruction.  */
        !          1236: 
        !          1237: #define MOVE_MAX 8
        !          1238: 
        !          1239: /* Largest number of bytes of an object that can be placed in a register.
        !          1240:    On the Alpha we have plenty of registers, so use TImode.  */
        !          1241: #define MAX_FIXED_MODE_SIZE    GET_MODE_BITSIZE (TImode)
        !          1242: 
        !          1243: /* Nonzero if access to memory by bytes is no faster than for words.
        !          1244:    Also non-zero if doing byte operations (specifically shifts) in registers
        !          1245:    is undesirable. 
        !          1246: 
        !          1247:    On the Alpha, we want to not use the byte operation and instead use
        !          1248:    masking operations to access fields; these will save instructions.  */
        !          1249: 
        !          1250: #define SLOW_BYTE_ACCESS       1
        !          1251: 
        !          1252: /* Define if operations between registers always perform the operation
        !          1253:    on the full register even if a narrower mode is specified.  */
        !          1254: #define WORD_REGISTER_OPERATIONS
        !          1255: 
        !          1256: /* Define if loading in MODE, an integral mode narrower than BITS_PER_WORD
        !          1257:    will either zero-extend or sign-extend.  The value of this macro should
        !          1258:    be the code that says which one of the two operations is implicitly
        !          1259:    done, NIL if none.  */
        !          1260: #define LOAD_EXTEND_OP(MODE) SIGN_EXTEND
        !          1261: 
        !          1262: /* Define if loading short immediate values into registers sign extends.  */
        !          1263: #define SHORT_IMMEDIATES_SIGN_EXTEND
        !          1264: 
        !          1265: /* Value is 1 if truncating an integer of INPREC bits to OUTPREC bits
        !          1266:    is done just by pretending it is already truncated.  */
        !          1267: #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
        !          1268: 
        !          1269: /* We assume that the store-condition-codes instructions store 0 for false
        !          1270:    and some other value for true.  This is the value stored for true.  */
        !          1271: 
        !          1272: #define STORE_FLAG_VALUE 1
        !          1273: 
        !          1274: /* Define the value returned by a floating-point comparison instruction.  */
        !          1275: 
        !          1276: #define FLOAT_STORE_FLAG_VALUE 0.5
        !          1277: 
        !          1278: /* Specify the machine mode that pointers have.
        !          1279:    After generation of rtl, the compiler makes no further distinction
        !          1280:    between pointers and any other objects of this machine mode.  */
        !          1281: #define Pmode DImode
        !          1282: 
        !          1283: /* Mode of a function address in a call instruction (for indexing purposes). */
        !          1284: 
        !          1285: #define FUNCTION_MODE Pmode
        !          1286: 
        !          1287: /* Define this if addresses of constant functions
        !          1288:    shouldn't be put through pseudo regs where they can be cse'd.
        !          1289:    Desirable on machines where ordinary constants are expensive
        !          1290:    but a CALL with constant address is cheap.
        !          1291: 
        !          1292:    We define this on the Alpha so that gen_call and gen_call_value
        !          1293:    get to see the SYMBOL_REF (for the hint field of the jsr).  It will
        !          1294:    then copy it into a register, thus actually letting the address be
        !          1295:    cse'ed.  */
        !          1296: 
        !          1297: #define NO_FUNCTION_CSE
        !          1298: 
        !          1299: /* Define this to be nonzero if shift instructions ignore all but the low-order
        !          1300:    few bits. */
        !          1301: #define SHIFT_COUNT_TRUNCATED 1
        !          1302: 
        !          1303: /* Use atexit for static constructors/destructors, instead of defining
        !          1304:    our own exit function.  */
        !          1305: #define HAVE_ATEXIT
        !          1306: 
        !          1307: /* Compute the cost of computing a constant rtl expression RTX
        !          1308:    whose rtx-code is CODE.  The body of this macro is a portion
        !          1309:    of a switch statement.  If the code is computed here,
        !          1310:    return it with a return statement.  Otherwise, break from the switch.
        !          1311: 
        !          1312:    We only care about the cost if it is valid in an insn, so all constants
        !          1313:    are cheap.  */
        !          1314: 
        !          1315: #define CONST_COSTS(RTX,CODE,OUTER_CODE) \
        !          1316:   case CONST_INT:                                              \
        !          1317:   case CONST_DOUBLE:                                           \
        !          1318:     return 0;                                                  \
        !          1319:   case CONST:                                                  \
        !          1320:   case SYMBOL_REF:                                             \
        !          1321:   case LABEL_REF:                                              \
        !          1322:     return 6;                                                  \
        !          1323:     
        !          1324: /* Provide the costs of a rtl expression.  This is in the body of a
        !          1325:    switch on CODE.  */
        !          1326:    
        !          1327: #define RTX_COSTS(X,CODE,OUTER_CODE)                   \
        !          1328:   case PLUS:                                           \
        !          1329:   case MINUS:                                          \
        !          1330:     if (GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT)   \
        !          1331:       return COSTS_N_INSNS (6);                                \
        !          1332:     else if (GET_CODE (XEXP (X, 0)) == MULT            \
        !          1333:             && const48_operand (XEXP (XEXP (X, 0), 1), VOIDmode)) \
        !          1334:       return (2 + rtx_cost (XEXP (XEXP (X, 0), 0), OUTER_CODE) \
        !          1335:              + rtx_cost (XEXP (X, 1), OUTER_CODE));    \
        !          1336:     break;                                             \
        !          1337:   case MULT:                                           \
        !          1338:     if (GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT)   \
        !          1339:       return COSTS_N_INSNS (6);                                \
        !          1340:     else if (GET_CODE (XEXP (X, 1)) != CONST_INT       \
        !          1341:             || exact_log2 (INTVAL (XEXP (X, 1))) < 0)  \
        !          1342:       return COSTS_N_INSNS (21);                       \
        !          1343:     else if (const48_operand (XEXP (X, 1), VOIDmode))  \
        !          1344:       break;                                           \
        !          1345:     return COSTS_N_INSNS (2);                          \
        !          1346:   case ASHIFT:                                         \
        !          1347:     if (GET_CODE (XEXP (X, 1)) == CONST_INT            \
        !          1348:        && INTVAL (XEXP (X, 1)) <= 3)                   \
        !          1349:       break;                                           \
        !          1350:     /* ... fall through ... */                         \
        !          1351:   case ASHIFTRT:  case LSHIFTRT:  case IF_THEN_ELSE:   \
        !          1352:     return COSTS_N_INSNS (2);                          \
        !          1353:   case DIV:                                            \
        !          1354:   case UDIV:                                           \
        !          1355:   case MOD:                                            \
        !          1356:   case UMOD:                                           \
        !          1357:     if (GET_MODE (X) == SFmode)                                \
        !          1358:       return COSTS_N_INSNS (34);                       \
        !          1359:     else if (GET_MODE (X) == DFmode)                   \
        !          1360:       return COSTS_N_INSNS (63);                       \
        !          1361:     else                                               \
        !          1362:       return COSTS_N_INSNS (70);                       \
        !          1363:   case MEM:                                            \
        !          1364:     return COSTS_N_INSNS (3);
        !          1365: 
        !          1366: /* Control the assembler format that we output.  */
        !          1367: 
        !          1368: /* Output at beginning of assembler file.  */
        !          1369: 
        !          1370: #define ASM_FILE_START(FILE)                                   \
        !          1371: {                                                              \
        !          1372:   alpha_write_verstamp (FILE);                                 \
        !          1373:   fprintf (FILE, "\t.set noreorder\n");                                \
        !          1374:   fprintf (FILE, "\t.set noat\n");                             \
        !          1375:   ASM_OUTPUT_SOURCE_FILENAME (FILE, main_input_filename);      \
        !          1376: }
        !          1377: 
        !          1378: /* Output to assembler file text saying following lines
        !          1379:    may contain character constants, extra white space, comments, etc.  */
        !          1380: 
        !          1381: #define ASM_APP_ON ""
        !          1382: 
        !          1383: /* Output to assembler file text saying following lines
        !          1384:    no longer contain unusual constructs.  */
        !          1385: 
        !          1386: #define ASM_APP_OFF ""
        !          1387: 
        !          1388: #define TEXT_SECTION_ASM_OP ".text"
        !          1389: 
        !          1390: /* Output before read-only data.  */
        !          1391: 
        !          1392: #define READONLY_DATA_SECTION_ASM_OP ".rdata"
        !          1393: 
        !          1394: /* Output before writable data.  */
        !          1395: 
        !          1396: #define DATA_SECTION_ASM_OP ".data"
        !          1397: 
        !          1398: /* Define an extra section for read-only data, a routine to enter it, and
        !          1399:    indicate that it is for read-only data.  */
        !          1400: 
        !          1401: #define EXTRA_SECTIONS readonly_data
        !          1402: 
        !          1403: #define EXTRA_SECTION_FUNCTIONS                                        \
        !          1404: void                                                           \
        !          1405: literal_section ()                                             \
        !          1406: {                                                              \
        !          1407:   if (in_section != readonly_data)                             \
        !          1408:     {                                                          \
        !          1409:       fprintf (asm_out_file, "%s\n", READONLY_DATA_SECTION_ASM_OP); \
        !          1410:       in_section = readonly_data;                              \
        !          1411:     }                                                          \
        !          1412: }                                                              \
        !          1413: 
        !          1414: #define READONLY_DATA_SECTION  literal_section
        !          1415: 
        !          1416: /* If we are referencing a function that is static or is known to be
        !          1417:    in this file, make the SYMBOL_REF special.  We can use this to see
        !          1418:    indicate that we can branch to this function without setting PV or
        !          1419:    restoring GP.  */
        !          1420: 
        !          1421: #define ENCODE_SECTION_INFO(DECL)  \
        !          1422:   if (TREE_CODE (DECL) == FUNCTION_DECL                        \
        !          1423:       && (TREE_ASM_WRITTEN (DECL) || ! TREE_PUBLIC (DECL))) \
        !          1424:     SYMBOL_REF_FLAG (XEXP (DECL_RTL (DECL), 0)) = 1;
        !          1425: 
        !          1426: /* How to refer to registers in assembler output.
        !          1427:    This sequence is indexed by compiler's hard-register-number (see above).  */
        !          1428: 
        !          1429: #define REGISTER_NAMES                                         \
        !          1430: {"$0", "$1", "$2", "$3", "$4", "$5", "$6", "$7", "$8",         \
        !          1431:  "$9", "$10", "$11", "$12", "$13", "$14", "$15",               \
        !          1432:  "$16", "$17", "$18", "$19", "$20", "$21", "$22", "$23",       \
        !          1433:  "$24", "$25", "$26", "$27", "$28", "$29", "$30", "AP",                \
        !          1434:  "$f0", "$f1", "$f2", "$f3", "$f4", "$f5", "$f6", "$f7", "$f8",        \
        !          1435:  "$f9", "$f10", "$f11", "$f12", "$f13", "$f14", "$f15",                \
        !          1436:  "$f16", "$f17", "$f18", "$f19", "$f20", "$f21", "$f22", "$f23",\
        !          1437:  "$f24", "$f25", "$f26", "$f27", "$f28", "$f29", "$f30", "$f31"}
        !          1438: 
        !          1439: /* How to renumber registers for dbx and gdb.  */
        !          1440: 
        !          1441: #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
        !          1442: 
        !          1443: /* This is how to output the definition of a user-level label named NAME,
        !          1444:    such as the label on a static function or variable NAME.  */
        !          1445: 
        !          1446: #define ASM_OUTPUT_LABEL(FILE,NAME)    \
        !          1447:   do { assemble_name (FILE, NAME); fputs (":\n", FILE); } while (0)
        !          1448: 
        !          1449: /* This is how to output a command to make the user-level label named NAME
        !          1450:    defined for reference from other files.  */
        !          1451: 
        !          1452: #define ASM_GLOBALIZE_LABEL(FILE,NAME) \
        !          1453:   do { fputs ("\t.globl ", FILE); assemble_name (FILE, NAME); fputs ("\n", FILE);} while (0)
        !          1454: 
        !          1455: /* This is how to output a reference to a user-level label named NAME.
        !          1456:    `assemble_name' uses this.  */
        !          1457: 
        !          1458: #define ASM_OUTPUT_LABELREF(FILE,NAME) \
        !          1459:   fprintf (FILE, "%s", NAME)
        !          1460: 
        !          1461: /* This is how to output an internal numbered label where
        !          1462:    PREFIX is the class of label and NUM is the number within the class.  */
        !          1463: 
        !          1464: #define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM)     \
        !          1465:   if ((PREFIX)[0] == 'L')                              \
        !          1466:     fprintf (FILE, "$%s%d:\n", & (PREFIX)[1], NUM + 32); \
        !          1467:   else                                                 \
        !          1468:     fprintf (FILE, "%s%d:\n", PREFIX, NUM);
        !          1469: 
        !          1470: /* This is how to output a label for a jump table.  Arguments are the same as
        !          1471:    for ASM_OUTPUT_INTERNAL_LABEL, except the insn for the jump table is
        !          1472:    passed. */
        !          1473: 
        !          1474: #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,TABLEINSN)       \
        !          1475: { ASM_OUTPUT_ALIGN (FILE, 2); ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM); }
        !          1476: 
        !          1477: /* This is how to store into the string LABEL
        !          1478:    the symbol_ref name of an internal numbered label where
        !          1479:    PREFIX is the class of label and NUM is the number within the class.
        !          1480:    This is suitable for output with `assemble_name'.  */
        !          1481: 
        !          1482: #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)  \
        !          1483:   if ((PREFIX)[0] == 'L')                              \
        !          1484:     sprintf (LABEL, "*$%s%d", & (PREFIX)[1], NUM + 32);        \
        !          1485:   else                                                 \
        !          1486:     sprintf (LABEL, "*%s%d", PREFIX, NUM)
        !          1487: 
        !          1488: /* This is how to output an assembler line defining a `double' constant.  */
        !          1489: 
        !          1490: #define ASM_OUTPUT_DOUBLE(FILE,VALUE)                                  \
        !          1491:   {                                                                    \
        !          1492:     if (REAL_VALUE_ISINF (VALUE)                                       \
        !          1493:         || REAL_VALUE_ISNAN (VALUE)                                    \
        !          1494:        || REAL_VALUE_MINUS_ZERO (VALUE))                               \
        !          1495:       {                                                                        \
        !          1496:        long t[2];                                                      \
        !          1497:        REAL_VALUE_TO_TARGET_DOUBLE ((VALUE), t);                       \
        !          1498:        fprintf (FILE, "\t.quad 0x%lx%08lx\n",                          \
        !          1499:                t[1] & 0xffffffff, t[0] & 0xffffffff);                  \
        !          1500:       }                                                                        \
        !          1501:     else                                                               \
        !          1502:       {                                                                        \
        !          1503:        char str[30];                                                   \
        !          1504:        REAL_VALUE_TO_DECIMAL (VALUE, "%.20e", str);                    \
        !          1505:        fprintf (FILE, "\t.t_floating %s\n", str);                      \
        !          1506:       }                                                                        \
        !          1507:   }
        !          1508: 
        !          1509: /* This is how to output an assembler line defining a `float' constant.  */
        !          1510: 
        !          1511: #define ASM_OUTPUT_FLOAT(FILE,VALUE)                                   \
        !          1512:   {                                                                    \
        !          1513:     if (REAL_VALUE_ISINF (VALUE)                                       \
        !          1514:         || REAL_VALUE_ISNAN (VALUE)                                    \
        !          1515:        || REAL_VALUE_MINUS_ZERO (VALUE))                               \
        !          1516:       {                                                                        \
        !          1517:        long t;                                                         \
        !          1518:        REAL_VALUE_TO_TARGET_SINGLE ((VALUE), t);                       \
        !          1519:        fprintf (FILE, "\t.long 0x%lx\n", t & 0xffffffff);              \
        !          1520:       }                                                                        \
        !          1521:     else                                                               \
        !          1522:       {                                                                        \
        !          1523:        char str[30];                                                   \
        !          1524:        REAL_VALUE_TO_DECIMAL ((VALUE), "%.20e", str);                  \
        !          1525:        fprintf (FILE, "\t.s_floating %s\n", str);                      \
        !          1526:       }                                                                        \
        !          1527:   }
        !          1528:   
        !          1529: /* This is how to output an assembler line defining an `int' constant.  */
        !          1530: 
        !          1531: #define ASM_OUTPUT_INT(FILE,VALUE)             \
        !          1532:   fprintf (FILE, "\t.long %d\n",               \
        !          1533:     (GET_CODE (VALUE) == CONST_INT             \
        !          1534:      ? INTVAL (VALUE) & 0xffffffff : (abort (), 0)))
        !          1535: 
        !          1536: /* This is how to output an assembler line defining a `long' constant.  */
        !          1537: 
        !          1538: #define ASM_OUTPUT_DOUBLE_INT(FILE,VALUE)      \
        !          1539: ( fprintf (FILE, "\t.quad "),                  \
        !          1540:   output_addr_const (FILE, (VALUE)),           \
        !          1541:   fprintf (FILE, "\n"))
        !          1542: 
        !          1543: /* Likewise for `char' and `short' constants.  */
        !          1544: 
        !          1545: #define ASM_OUTPUT_SHORT(FILE,VALUE)  \
        !          1546:   fprintf (FILE, "\t.word %d\n",               \
        !          1547:     (GET_CODE (VALUE) == CONST_INT             \
        !          1548:      ? INTVAL (VALUE) & 0xffff : (abort (), 0)))
        !          1549: 
        !          1550: #define ASM_OUTPUT_CHAR(FILE,VALUE)            \
        !          1551:   fprintf (FILE, "\t.byte %d\n",               \
        !          1552:     (GET_CODE (VALUE) == CONST_INT             \
        !          1553:      ? INTVAL (VALUE) & 0xff : (abort (), 0)))
        !          1554: 
        !          1555: /* We use the default ASCII-output routine, except that we don't write more
        !          1556:    than 50 characters since the assembler doesn't support very long lines.  */
        !          1557: 
        !          1558: #define ASM_OUTPUT_ASCII(MYFILE, MYSTRING, MYLENGTH) \
        !          1559:   do {                                                                       \
        !          1560:     FILE *_hide_asm_out_file = (MYFILE);                                     \
        !          1561:     unsigned char *_hide_p = (unsigned char *) (MYSTRING);                   \
        !          1562:     int _hide_thissize = (MYLENGTH);                                         \
        !          1563:     int _size_so_far = 0;                                                    \
        !          1564:     {                                                                        \
        !          1565:       FILE *asm_out_file = _hide_asm_out_file;                               \
        !          1566:       unsigned char *p = _hide_p;                                            \
        !          1567:       int thissize = _hide_thissize;                                         \
        !          1568:       int i;                                                                 \
        !          1569:       fprintf (asm_out_file, "\t.ascii \"");                                 \
        !          1570:                                                                              \
        !          1571:       for (i = 0; i < thissize; i++)                                         \
        !          1572:        {                                                                     \
        !          1573:          register int c = p[i];                                              \
        !          1574:                                                                              \
        !          1575:          if (_size_so_far ++ > 50 && i < thissize - 4)                       \
        !          1576:            _size_so_far = 0, fprintf (asm_out_file, "\"\n\t.ascii \"");      \
        !          1577:                                                                              \
        !          1578:          if (c == '\"' || c == '\\')                                         \
        !          1579:            putc ('\\', asm_out_file);                                        \
        !          1580:          if (c >= ' ' && c < 0177)                                           \
        !          1581:            putc (c, asm_out_file);                                           \
        !          1582:          else                                                                \
        !          1583:            {                                                                 \
        !          1584:              fprintf (asm_out_file, "\\%o", c);                              \
        !          1585:              /* After an octal-escape, if a digit follows,                   \
        !          1586:                 terminate one string constant and start another.             \
        !          1587:                 The Vax assembler fails to stop reading the escape           \
        !          1588:                 after three digits, so this is the only way we               \
        !          1589:                 can get it to parse the data properly.  */                   \
        !          1590:              if (i < thissize - 1                                            \
        !          1591:                  && p[i + 1] >= '0' && p[i + 1] <= '9')                      \
        !          1592:                fprintf (asm_out_file, "\"\n\t.ascii \"");                    \
        !          1593:          }                                                                   \
        !          1594:        }                                                                     \
        !          1595:       fprintf (asm_out_file, "\"\n");                                        \
        !          1596:     }                                                                        \
        !          1597:   }                                                                          \
        !          1598:   while (0)
        !          1599: /* This is how to output an insn to push a register on the stack.
        !          1600:    It need not be very fast code.  */
        !          1601: 
        !          1602: #define ASM_OUTPUT_REG_PUSH(FILE,REGNO)                                        \
        !          1603:  fprintf (FILE, "\tsubq $30,8,$30\n\tst%s $%s%d,0($30)\n",             \
        !          1604:          (REGNO) > 32 ? "t" : "q", (REGNO) > 32 ? "f" : "",            \
        !          1605:          (REGNO) & 31);
        !          1606: 
        !          1607: /* This is how to output an insn to pop a register from the stack.
        !          1608:    It need not be very fast code.  */
        !          1609: 
        !          1610: #define ASM_OUTPUT_REG_POP(FILE,REGNO)                                 \
        !          1611:   fprintf (FILE, "\tld%s $%s%d,0($30)\n\taddq $30,8,$30\n",            \
        !          1612:          (REGNO) > 32 ? "t" : "q", (REGNO) > 32 ? "f" : "",            \
        !          1613:          (REGNO) & 31);
        !          1614: 
        !          1615: /* This is how to output an assembler line for a numeric constant byte.  */
        !          1616: 
        !          1617: #define ASM_OUTPUT_BYTE(FILE,VALUE)  \
        !          1618:   fprintf (FILE, "\t.byte 0x%x\n", (VALUE) & 0xff)
        !          1619: 
        !          1620: /* This is how to output an element of a case-vector that is absolute.  */
        !          1621: 
        !          1622: #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
        !          1623:   fprintf (FILE, "\t.gprel32 $%d\n", (VALUE) + 32)
        !          1624: 
        !          1625: /* This is how to output an element of a case-vector that is relative.
        !          1626:    (Alpha does not use such vectors, but we must define this macro anyway.)  */
        !          1627: 
        !          1628: #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, VALUE, REL)  abort ()
        !          1629: 
        !          1630: /* This is how to output an assembler line
        !          1631:    that says to advance the location counter
        !          1632:    to a multiple of 2**LOG bytes.  */
        !          1633: 
        !          1634: #define ASM_OUTPUT_ALIGN(FILE,LOG)     \
        !          1635:   if ((LOG) != 0)                      \
        !          1636:     fprintf (FILE, "\t.align %d\n", LOG);
        !          1637: 
        !          1638: /* This is how to advance the location counter by SIZE bytes.  */
        !          1639: 
        !          1640: #define ASM_OUTPUT_SKIP(FILE,SIZE)  \
        !          1641:   fprintf (FILE, "\t.space %d\n", (SIZE))
        !          1642: 
        !          1643: /* This says how to output an assembler line
        !          1644:    to define a global common symbol.  */
        !          1645: 
        !          1646: #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)  \
        !          1647: ( fputs ("\t.comm ", (FILE)),                  \
        !          1648:   assemble_name ((FILE), (NAME)),              \
        !          1649:   fprintf ((FILE), ",%d\n", (SIZE)))
        !          1650: 
        !          1651: /* This says how to output an assembler line
        !          1652:    to define a local common symbol.  */
        !          1653: 
        !          1654: #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE,ROUNDED)     \
        !          1655: ( fputs ("\t.lcomm ", (FILE)),                         \
        !          1656:   assemble_name ((FILE), (NAME)),                      \
        !          1657:   fprintf ((FILE), ",%d\n", (SIZE)))
        !          1658: 
        !          1659: /* Store in OUTPUT a string (made with alloca) containing
        !          1660:    an assembler-name for a local static variable named NAME.
        !          1661:    LABELNO is an integer which is different for each call.  */
        !          1662: 
        !          1663: #define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO) \
        !          1664: ( (OUTPUT) = (char *) alloca (strlen ((NAME)) + 10),   \
        !          1665:   sprintf ((OUTPUT), "%s.%d", (NAME), (LABELNO)))
        !          1666: 
        !          1667: /* Define the parentheses used to group arithmetic operations
        !          1668:    in assembler code.  */
        !          1669: 
        !          1670: #define ASM_OPEN_PAREN "("
        !          1671: #define ASM_CLOSE_PAREN ")"
        !          1672: 
        !          1673: /* Define results of standard character escape sequences.  */
        !          1674: #define TARGET_BELL 007
        !          1675: #define TARGET_BS 010
        !          1676: #define TARGET_TAB 011
        !          1677: #define TARGET_NEWLINE 012
        !          1678: #define TARGET_VT 013
        !          1679: #define TARGET_FF 014
        !          1680: #define TARGET_CR 015
        !          1681: 
        !          1682: /* Print operand X (an rtx) in assembler syntax to file FILE.
        !          1683:    CODE is a letter or dot (`z' in `%z0') or 0 if no letter was specified.
        !          1684:    For `%' followed by punctuation, CODE is the punctuation and X is null.  */
        !          1685: 
        !          1686: #define PRINT_OPERAND(FILE, X, CODE)  print_operand (FILE, X, CODE)
        !          1687: 
        !          1688: /* Determine which codes are valid without a following integer.  These must
        !          1689:    not be alphabetic.  */
        !          1690: 
        !          1691: #define PRINT_OPERAND_PUNCT_VALID_P(CODE) 0
        !          1692: 
        !          1693: /* Print a memory address as an operand to reference that memory location.  */
        !          1694: 
        !          1695: #define PRINT_OPERAND_ADDRESS(FILE, ADDR)              \
        !          1696: { rtx addr = (ADDR);                                   \
        !          1697:   int basereg = 31;                                    \
        !          1698:   HOST_WIDE_INT offset = 0;                            \
        !          1699:                                                        \
        !          1700:   if (GET_CODE (addr) == AND)                          \
        !          1701:     addr = XEXP (addr, 0);                             \
        !          1702:                                                        \
        !          1703:   if (GET_CODE (addr) == REG)                          \
        !          1704:     basereg = REGNO (addr);                            \
        !          1705:   else if (GET_CODE (addr) == CONST_INT)               \
        !          1706:     offset = INTVAL (addr);                            \
        !          1707:   else if (GET_CODE (addr) == PLUS                     \
        !          1708:           && GET_CODE (XEXP (addr, 0)) == REG          \
        !          1709:           && GET_CODE (XEXP (addr, 1)) == CONST_INT)   \
        !          1710:     basereg = REGNO (XEXP (addr, 0)), offset = INTVAL (XEXP (addr, 1)); \
        !          1711:   else                                                 \
        !          1712:     abort ();                                          \
        !          1713:                                                        \
        !          1714:   fprintf (FILE, "%d($%d)", offset, basereg);          \
        !          1715: }
        !          1716: /* Define the codes that are matched by predicates in alpha.c.  */
        !          1717: 
        !          1718: #define PREDICATE_CODES \
        !          1719:   {"reg_or_0_operand", {SUBREG, REG, CONST_INT}},      \
        !          1720:   {"reg_or_6bit_operand", {SUBREG, REG, CONST_INT}},   \
        !          1721:   {"reg_or_8bit_operand", {SUBREG, REG, CONST_INT}},   \
        !          1722:   {"reg_or_cint_operand", {SUBREG, REG, CONST_INT}},   \
        !          1723:   {"add_operand", {SUBREG, REG, CONST_INT}},           \
        !          1724:   {"sext_add_operand", {SUBREG, REG, CONST_INT}},      \
        !          1725:   {"const48_operand", {CONST_INT}},                    \
        !          1726:   {"and_operand", {SUBREG, REG, CONST_INT}},           \
        !          1727:   {"mode_mask_operand", {CONST_INT}},                  \
        !          1728:   {"mul8_operand", {CONST_INT}},                       \
        !          1729:   {"mode_width_operand", {CONST_INT}},                 \
        !          1730:   {"reg_or_fp0_operand", {SUBREG, REG, CONST_DOUBLE}}, \
        !          1731:   {"alpha_comparison_operator", {EQ, LE, LT, LEU, LTU}}, \
        !          1732:   {"signed_comparison_operator", {EQ, NE, LE, LT, GE, GT}}, \
        !          1733:   {"divmod_operator", {DIV, MOD, UDIV, UMOD}},         \
        !          1734:   {"fp0_operand", {CONST_DOUBLE}},                     \
        !          1735:   {"current_file_function_operand", {SYMBOL_REF}},     \
        !          1736:   {"input_operand", {SUBREG, REG, MEM, CONST_INT, CONST_DOUBLE,        \
        !          1737:                     SYMBOL_REF, CONST, LABEL_REF}},    \
        !          1738:   {"aligned_memory_operand", {MEM}},                   \
        !          1739:   {"unaligned_memory_operand", {MEM}},                 \
        !          1740:   {"any_memory_operand", {MEM}},
        !          1741: 
        !          1742: /* Definitions for debugging.  */
        !          1743: 
        !          1744: #define SDB_DEBUGGING_INFO             /* generate info for mips-tfile */
        !          1745: #define DBX_DEBUGGING_INFO             /* generate embedded stabs */
        !          1746: #define MIPS_DEBUGGING_INFO            /* MIPS specific debugging info */
        !          1747: 
        !          1748: #ifndef PREFERRED_DEBUGGING_TYPE       /* assume SDB_DEBUGGING_INFO */
        !          1749: #define PREFERRED_DEBUGGING_TYPE ((len > 1 && !strncmp (str, "ggdb", len)) ? DBX_DEBUG : SDB_DEBUG)
        !          1750: #endif
        !          1751: 
        !          1752: 
        !          1753: /* Correct the offset of automatic variables and arguments.  Note that
        !          1754:    the Alpha debug format wants all automatic variables and arguments
        !          1755:    to be in terms of two different offsets from the virtual frame pointer,
        !          1756:    which is the stack pointer before any adjustment in the function.
        !          1757:    The offset for the argument pointer is fixed for the native compiler,
        !          1758:    it is either zero (for the no arguments case) or large enough to hold
        !          1759:    all argument registers.
        !          1760:    The offset for the auto pointer is the fourth argument to the .frame
        !          1761:    directive (local_offset).
        !          1762:    To stay compatible with the native tools we use the same offsets
        !          1763:    from the virtual frame pointer and adjust the debugger arg/auto offsets
        !          1764:    accordingly. These debugger offsets are set up in output_prolog.  */
        !          1765: 
        !          1766: long alpha_arg_offset;
        !          1767: long alpha_auto_offset;
        !          1768: #define DEBUGGER_AUTO_OFFSET(X) \
        !          1769:   ((GET_CODE (X) == PLUS ? INTVAL (XEXP (X, 1)) : 0) + alpha_auto_offset)
        !          1770: #define DEBUGGER_ARG_OFFSET(OFFSET, X) (OFFSET + alpha_arg_offset)
        !          1771: 
        !          1772: 
        !          1773: #define ASM_OUTPUT_SOURCE_LINE(STREAM, LINE)                           \
        !          1774:   alpha_output_lineno (STREAM, LINE)
        !          1775: extern void alpha_output_lineno ();
        !          1776: 
        !          1777: #define ASM_OUTPUT_SOURCE_FILENAME(STREAM, NAME)                       \
        !          1778:   alpha_output_filename (STREAM, NAME)
        !          1779: extern void alpha_output_filename ();
        !          1780: 
        !          1781: 
        !          1782: /* mips-tfile.c limits us to strings of one page.  */
        !          1783: #define DBX_CONTIN_LENGTH 4000
        !          1784: 
        !          1785: /* By default, turn on GDB extensions.  */
        !          1786: #define DEFAULT_GDB_EXTENSIONS 1
        !          1787: 
        !          1788: /* If we are smuggling stabs through the ALPHA ECOFF object
        !          1789:    format, put a comment in front of the .stab<x> operation so
        !          1790:    that the ALPHA assembler does not choke.  The mips-tfile program
        !          1791:    will correctly put the stab into the object file.  */
        !          1792: 
        !          1793: #define ASM_STABS_OP   ((TARGET_GAS) ? ".stabs" : " #.stabs")
        !          1794: #define ASM_STABN_OP   ((TARGET_GAS) ? ".stabn" : " #.stabn")
        !          1795: #define ASM_STABD_OP   ((TARGET_GAS) ? ".stabd" : " #.stabd")
        !          1796: 
        !          1797: /* Forward references to tags are allowed.  */
        !          1798: #define SDB_ALLOW_FORWARD_REFERENCES
        !          1799: 
        !          1800: /* Unknown tags are also allowed.  */
        !          1801: #define SDB_ALLOW_UNKNOWN_REFERENCES
        !          1802: 
        !          1803: #define PUT_SDB_DEF(a)                                 \
        !          1804: do {                                                   \
        !          1805:   fprintf (asm_out_file, "\t%s.def\t",                 \
        !          1806:           (TARGET_GAS) ? "" : "#");                    \
        !          1807:   ASM_OUTPUT_LABELREF (asm_out_file, a);               \
        !          1808:   fputc (';', asm_out_file);                           \
        !          1809: } while (0)
        !          1810: 
        !          1811: #define PUT_SDB_PLAIN_DEF(a)                           \
        !          1812: do {                                                   \
        !          1813:   fprintf (asm_out_file, "\t%s.def\t.%s;",             \
        !          1814:           (TARGET_GAS) ? "" : "#", (a));               \
        !          1815: } while (0)
        !          1816: 
        !          1817: #define PUT_SDB_TYPE(a)                                        \
        !          1818: do {                                                   \
        !          1819:   fprintf (asm_out_file, "\t.type\t0x%x;", (a));       \
        !          1820: } while (0)
        !          1821: 
        !          1822: /* For block start and end, we create labels, so that
        !          1823:    later we can figure out where the correct offset is.
        !          1824:    The normal .ent/.end serve well enough for functions,
        !          1825:    so those are just commented out.  */
        !          1826: 
        !          1827: extern int sdb_label_count;            /* block start/end next label # */
        !          1828: 
        !          1829: #define PUT_SDB_BLOCK_START(LINE)                      \
        !          1830: do {                                                   \
        !          1831:   fprintf (asm_out_file,                               \
        !          1832:           "$Lb%d:\n\t%s.begin\t$Lb%d\t%d\n",           \
        !          1833:           sdb_label_count,                             \
        !          1834:           (TARGET_GAS) ? "" : "#",                     \
        !          1835:           sdb_label_count,                             \
        !          1836:           (LINE));                                     \
        !          1837:   sdb_label_count++;                                   \
        !          1838: } while (0)
        !          1839: 
        !          1840: #define PUT_SDB_BLOCK_END(LINE)                                \
        !          1841: do {                                                   \
        !          1842:   fprintf (asm_out_file,                               \
        !          1843:           "$Le%d:\n\t%s.bend\t$Le%d\t%d\n",            \
        !          1844:           sdb_label_count,                             \
        !          1845:           (TARGET_GAS) ? "" : "#",                     \
        !          1846:           sdb_label_count,                             \
        !          1847:           (LINE));                                     \
        !          1848:   sdb_label_count++;                                   \
        !          1849: } while (0)
        !          1850: 
        !          1851: #define PUT_SDB_FUNCTION_START(LINE)
        !          1852: 
        !          1853: #define PUT_SDB_FUNCTION_END(LINE)
        !          1854: 
        !          1855: #define PUT_SDB_EPILOGUE_END(NAME)
        !          1856: 
        !          1857: /* Specify to run a post-processor, mips-tfile after the assembler
        !          1858:    has run to stuff the ecoff debug information into the object file.
        !          1859:    This is needed because the Alpha assembler provides no way
        !          1860:    of specifying such information in the assembly file.  */
        !          1861: 
        !          1862: #if (TARGET_DEFAULT & MASK_GAS) != 0
        !          1863: 
        !          1864: #define ASM_FINAL_SPEC "\
        !          1865: %{malpha-as: %{!mno-mips-tfile: \
        !          1866:        \n mips-tfile %{v*: -v} \
        !          1867:                %{K: -I %b.o~} \
        !          1868:                %{!K: %{save-temps: -I %b.o~}} \
        !          1869:                %{c:%W{o*}%{!o*:-o %b.o}}%{!c:-o %U.o} \
        !          1870:                %{.s:%i} %{!.s:%g.s}}}"
        !          1871: 
        !          1872: #else
        !          1873: #define ASM_FINAL_SPEC "\
        !          1874: %{!mgas: %{!mno-mips-tfile: \
        !          1875:        \n mips-tfile %{v*: -v} \
        !          1876:                %{K: -I %b.o~} \
        !          1877:                %{!K: %{save-temps: -I %b.o~}} \
        !          1878:                %{c:%W{o*}%{!o*:-o %b.o}}%{!c:-o %U.o} \
        !          1879:                %{.s:%i} %{!.s:%g.s}}}"
        !          1880: 
        !          1881: #endif
        !          1882: 
        !          1883: /* Macros for mips-tfile.c to encapsulate stabs in ECOFF, and for
        !          1884:    mips-tdump.c to print them out.
        !          1885: 
        !          1886:    These must match the corresponding definitions in gdb/mipsread.c.
        !          1887:    Unfortunately, gcc and gdb do not currently share any directories. */
        !          1888: 
        !          1889: #define CODE_MASK 0x8F300
        !          1890: #define MIPS_IS_STAB(sym) (((sym)->index & 0xFFF00) == CODE_MASK)
        !          1891: #define MIPS_MARK_STAB(code) ((code)+CODE_MASK)
        !          1892: #define MIPS_UNMARK_STAB(code) ((code)-CODE_MASK)
        !          1893: 
        !          1894: /* Override some mips-tfile definitions.  */
        !          1895: 
        !          1896: #define SHASH_SIZE 511
        !          1897: #define THASH_SIZE 55

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