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Annotation of gcc/config/i386/i386.h, revision 1.1

1.1     ! root        1: /* Definitions of target machine for GNU compiler for Intel 80386.
        !             2:    Copyright (C) 1988, 1992 Free Software Foundation, Inc.
        !             3: 
        !             4: This file is part of GNU CC.
        !             5: 
        !             6: GNU CC is free software; you can redistribute it and/or modify
        !             7: it under the terms of the GNU General Public License as published by
        !             8: the Free Software Foundation; either version 2, or (at your option)
        !             9: any later version.
        !            10: 
        !            11: GNU CC is distributed in the hope that it will be useful,
        !            12: but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            14: GNU General Public License for more details.
        !            15: 
        !            16: You should have received a copy of the GNU General Public License
        !            17: along with GNU CC; see the file COPYING.  If not, write to
        !            18: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
        !            19: 
        !            20: 
        !            21: /* The purpose of this file is to define the characteristics of the i386,
        !            22:    independent of assembler syntax or operating system.
        !            23: 
        !            24:    Three other files build on this one to describe a specific assembler syntax:
        !            25:    bsd386.h, att386.h, and sun386.h.
        !            26: 
        !            27:    The actual tm.h file for a particular system should include
        !            28:    this file, and then the file for the appropriate assembler syntax.
        !            29: 
        !            30:    Many macros that specify assembler syntax are omitted entirely from
        !            31:    this file because they really belong in the files for particular
        !            32:    assemblers.  These include AS1, AS2, AS3, RP, IP, LPREFIX, L_SIZE,
        !            33:    PUT_OP_SIZE, USE_STAR, ADDR_BEG, ADDR_END, PRINT_IREG, PRINT_SCALE,
        !            34:    PRINT_B_I_S, and many that start with ASM_ or end in ASM_OP.  */
        !            35: 
        !            36: /* Names to predefine in the preprocessor for this target machine.  */
        !            37: 
        !            38: #define I386 1
        !            39: 
        !            40: /* Stubs for half-pic support if not OSF/1 reference platform.  */
        !            41: 
        !            42: #ifndef HALF_PIC_P
        !            43: #define HALF_PIC_P() 0
        !            44: #define HALF_PIC_NUMBER_PTRS 0
        !            45: #define HALF_PIC_NUMBER_REFS 0
        !            46: #define HALF_PIC_ENCODE(DECL)
        !            47: #define HALF_PIC_DECLARE(NAME)
        !            48: #define HALF_PIC_INIT()        error ("half-pic init called on systems that don't support it.")
        !            49: #define HALF_PIC_ADDRESS_P(X) 0
        !            50: #define HALF_PIC_PTR(X) X
        !            51: #define HALF_PIC_FINISH(STREAM)
        !            52: #endif
        !            53: 
        !            54: /* Run-time compilation parameters selecting different hardware subsets.  */
        !            55: 
        !            56: extern int target_flags;
        !            57: 
        !            58: /* Macros used in the machine description to test the flags.  */
        !            59: 
        !            60: /* configure can arrage to make this 2, to force a 486.  */
        !            61: #ifndef TARGET_CPU_DEFAULT
        !            62: #define TARGET_CPU_DEFAULT 0
        !            63: #endif
        !            64: 
        !            65: /* Compile 80387 insns for floating point (not library calls).  */
        !            66: #define TARGET_80387 (target_flags & 1)
        !            67: /* Compile code for an i486. */
        !            68: #define TARGET_486 (target_flags & 2)
        !            69: /* Compile using ret insn that pops args.
        !            70:    This will not work unless you use prototypes at least
        !            71:    for all functions that can take varying numbers of args.  */  
        !            72: #define TARGET_RTD (target_flags & 8)
        !            73: /* Compile passing first two args in regs 0 and 1.
        !            74:    This exists only to test compiler features that will
        !            75:    be needed for RISC chips.  It is not usable
        !            76:    and is not intended to be usable on this cpu.  */
        !            77: #define TARGET_REGPARM (target_flags & 020)
        !            78: 
        !            79: /* Put uninitialized locals into bss, not data.
        !            80:    Meaningful only on svr3.  */
        !            81: #define TARGET_SVR3_SHLIB (target_flags & 040)
        !            82: 
        !            83: /* Use IEEE floating point comparisons.  These handle correctly the cases
        !            84:    where the result of a comparison is unordered.  Normally SIGFPE is
        !            85:    generated in such cases, in which case this isn't needed.  */
        !            86: #define TARGET_IEEE_FP (target_flags & 0100)
        !            87: 
        !            88: /* Functions that return a floating point value may return that value
        !            89:    in the 387 FPU or in 386 integer registers.  If set, this flag causes
        !            90:    the 387 to be used, which is compatible with most calling conventions. */
        !            91: #define TARGET_FLOAT_RETURNS_IN_80387 (target_flags & 0200)
        !            92: 
        !            93: /* Macro to define tables used to set the flags.
        !            94:    This is a list in braces of pairs in braces,
        !            95:    each pair being { "NAME", VALUE }
        !            96:    where VALUE is the bits to set or minus the bits to clear.
        !            97:    An empty string NAME is used to identify the default VALUE.  */
        !            98: 
        !            99: #define TARGET_SWITCHES  \
        !           100:   { { "80387", 1},                             \
        !           101:     { "no-80387", -1},                         \
        !           102:     { "soft-float", -1},                       \
        !           103:     { "no-soft-float", 1},                     \
        !           104:     { "486", 2},                               \
        !           105:     { "no-486", -2},                           \
        !           106:     { "386", -2},                              \
        !           107:     { "rtd", 8},                               \
        !           108:     { "no-rtd", -8},                           \
        !           109:     { "regparm", 020},                         \
        !           110:     { "no-regparm", -020},                     \
        !           111:     { "svr3-shlib", 040},                      \
        !           112:     { "no-svr3-shlib", -040},                  \
        !           113:     { "ieee-fp", 0100},                                \
        !           114:     { "no-ieee-fp", -0100},                    \
        !           115:     { "fp-ret-in-387", 0200},                  \
        !           116:     { "no-fp-ret-in-387", -0200},              \
        !           117:     SUBTARGET_SWITCHES                          \
        !           118:     { "", TARGET_DEFAULT | TARGET_CPU_DEFAULT}}
        !           119: 
        !           120: /* This is meant to be redefined in the host dependent files */
        !           121: #define SUBTARGET_SWITCHES
        !           122: 
        !           123: 
        !           124: /* target machine storage layout */
        !           125: 
        !           126: /* Define this if most significant byte of a word is the lowest numbered.  */
        !           127: /* That is true on the 80386.  */
        !           128: 
        !           129: #define BITS_BIG_ENDIAN 0
        !           130: 
        !           131: /* Define this if most significant byte of a word is the lowest numbered.  */
        !           132: /* That is not true on the 80386.  */
        !           133: #define BYTES_BIG_ENDIAN 0
        !           134: 
        !           135: /* Define this if most significant word of a multiword number is the lowest
        !           136:    numbered.  */
        !           137: /* Not true for 80386 */
        !           138: #define WORDS_BIG_ENDIAN 0
        !           139: 
        !           140: /* number of bits in an addressable storage unit */
        !           141: #define BITS_PER_UNIT 8
        !           142: 
        !           143: /* Width in bits of a "word", which is the contents of a machine register.
        !           144:    Note that this is not necessarily the width of data type `int';
        !           145:    if using 16-bit ints on a 80386, this would still be 32.
        !           146:    But on a machine with 16-bit registers, this would be 16.  */
        !           147: #define BITS_PER_WORD 32
        !           148: 
        !           149: /* Width of a word, in units (bytes).  */
        !           150: #define UNITS_PER_WORD 4
        !           151: 
        !           152: /* Width in bits of a pointer.
        !           153:    See also the macro `Pmode' defined below.  */
        !           154: #define POINTER_SIZE 32
        !           155: 
        !           156: /* Allocation boundary (in *bits*) for storing arguments in argument list.  */
        !           157: #define PARM_BOUNDARY 32
        !           158: 
        !           159: /* Boundary (in *bits*) on which stack pointer should be aligned.  */
        !           160: #define STACK_BOUNDARY 32
        !           161: 
        !           162: /* Allocation boundary (in *bits*) for the code of a function.
        !           163:    For i486, we get better performance by aligning to a cache
        !           164:    line (i.e. 16 byte) boundary.  */
        !           165: #define FUNCTION_BOUNDARY (TARGET_486 ? 128 : 32)
        !           166: 
        !           167: /* Alignment of field after `int : 0' in a structure. */
        !           168: 
        !           169: #define EMPTY_FIELD_BOUNDARY 32
        !           170: 
        !           171: /* Minimum size in bits of the largest boundary to which any
        !           172:    and all fundamental data types supported by the hardware
        !           173:    might need to be aligned. No data type wants to be aligned
        !           174:    rounder than this.  The i386 supports 64-bit floating point
        !           175:    quantities, but these can be aligned on any 32-bit boundary.  */
        !           176: #define BIGGEST_ALIGNMENT 32
        !           177: 
        !           178: /* Set this non-zero if move instructions will actually fail to work
        !           179:    when given unaligned data.  */
        !           180: #define STRICT_ALIGNMENT 0
        !           181: 
        !           182: /* If bit field type is int, don't let it cross an int,
        !           183:    and give entire struct the alignment of an int.  */
        !           184: /* Required on the 386 since it doesn't have bitfield insns.  */
        !           185: #define PCC_BITFIELD_TYPE_MATTERS 1
        !           186: 
        !           187: /* Align loop starts for optimal branching.  */
        !           188: #define ASM_OUTPUT_LOOP_ALIGN(FILE) \
        !           189:   ASM_OUTPUT_ALIGN (FILE, 2)
        !           190: 
        !           191: /* This is how to align an instruction for optimal branching.
        !           192:    On i486 we'll get better performance by aligning on a
        !           193:    cache line (i.e. 16 byte) boundary.  */
        !           194: #define ASM_OUTPUT_ALIGN_CODE(FILE)    \
        !           195:   ASM_OUTPUT_ALIGN ((FILE), (TARGET_486 ? 4 : 2))
        !           196: 
        !           197: /* Standard register usage.  */
        !           198: 
        !           199: /* This processor has special stack-like registers.  See reg-stack.c
        !           200:    for details. */
        !           201: 
        !           202: #define STACK_REGS
        !           203: 
        !           204: /* Number of actual hardware registers.
        !           205:    The hardware registers are assigned numbers for the compiler
        !           206:    from 0 to just below FIRST_PSEUDO_REGISTER.
        !           207:    All registers that the compiler knows about must be given numbers,
        !           208:    even those that are not normally considered general registers.
        !           209: 
        !           210:    In the 80386 we give the 8 general purpose registers the numbers 0-7.
        !           211:    We number the floating point registers 8-15.
        !           212:    Note that registers 0-7 can be accessed as a  short or int,
        !           213:    while only 0-3 may be used with byte `mov' instructions.
        !           214: 
        !           215:    Reg 16 does not correspond to any hardware register, but instead
        !           216:    appears in the RTL as an argument pointer prior to reload, and is
        !           217:    eliminated during reloading in favor of either the stack or frame
        !           218:    pointer. */
        !           219: 
        !           220: #define FIRST_PSEUDO_REGISTER 17
        !           221: 
        !           222: /* 1 for registers that have pervasive standard uses
        !           223:    and are not available for the register allocator.
        !           224:    On the 80386, the stack pointer is such, as is the arg pointer. */
        !           225: #define FIXED_REGISTERS \
        !           226: /*ax,dx,cx,bx,si,di,bp,sp,st,st1,st2,st3,st4,st5,st6,st7,arg*/       \
        !           227: {  0, 0, 0, 0, 0, 0, 0, 1, 0,  0,  0,  0,  0,  0,  0,  0,  1 }
        !           228: 
        !           229: /* 1 for registers not available across function calls.
        !           230:    These must include the FIXED_REGISTERS and also any
        !           231:    registers that can be used without being saved.
        !           232:    The latter must include the registers where values are returned
        !           233:    and the register where structure-value addresses are passed.
        !           234:    Aside from that, you can include as many other registers as you like.  */
        !           235: 
        !           236: #define CALL_USED_REGISTERS \
        !           237: /*ax,dx,cx,bx,si,di,bp,sp,st,st1,st2,st3,st4,st5,st6,st7,arg*/ \
        !           238: {  1, 1, 1, 0, 0, 0, 0, 1, 1,  1,  1,  1,  1,  1,  1,  1,  1 }
        !           239: 
        !           240: /* Macro to conditionally modify fixed_regs/call_used_regs.  */
        !           241: #define CONDITIONAL_REGISTER_USAGE                     \
        !           242:   {                                                    \
        !           243:     if (flag_pic)                                      \
        !           244:       {                                                        \
        !           245:        fixed_regs[PIC_OFFSET_TABLE_REGNUM] = 1;        \
        !           246:        call_used_regs[PIC_OFFSET_TABLE_REGNUM] = 1;    \
        !           247:       }                                                        \
        !           248:     if (! TARGET_80387 && ! TARGET_FLOAT_RETURNS_IN_80387) \
        !           249:       {                                                \
        !           250:        int i;                                          \
        !           251:        HARD_REG_SET x;                                 \
        !           252:         COPY_HARD_REG_SET (x, reg_class_contents[(int)FLOAT_REGS]); \
        !           253:         for (i = 0; i < FIRST_PSEUDO_REGISTER; i++ )   \
        !           254:          if (TEST_HARD_REG_BIT (x, i))                         \
        !           255:          fixed_regs[i] = call_used_regs[i] = 1;        \
        !           256:       }                                                        \
        !           257:   }
        !           258: 
        !           259: /* Return number of consecutive hard regs needed starting at reg REGNO
        !           260:    to hold something of mode MODE.
        !           261:    This is ordinarily the length in words of a value of mode MODE
        !           262:    but can be less for certain modes in special long registers.
        !           263: 
        !           264:    Actually there are no two word move instructions for consecutive 
        !           265:    registers.  And only registers 0-3 may have mov byte instructions
        !           266:    applied to them.
        !           267:    */
        !           268: 
        !           269: #define HARD_REGNO_NREGS(REGNO, MODE)   \
        !           270:   (FP_REGNO_P (REGNO) ? 1 \
        !           271:    : ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD))
        !           272: 
        !           273: /* Value is 1 if hard register REGNO can hold a value of machine-mode MODE.
        !           274:    On the 80386, the first 4 cpu registers can hold any mode
        !           275:    while the floating point registers may hold only floating point.
        !           276:    Make it clear that the fp regs could not hold a 16-byte float.  */
        !           277: 
        !           278: /* The casts to int placate a compiler on a microvax,
        !           279:    for cross-compiler testing.  */
        !           280: 
        !           281: #define HARD_REGNO_MODE_OK(REGNO, MODE) \
        !           282:   ((REGNO) < 2 ? 1                                             \
        !           283:    : (REGNO) < 4 ? 1                                           \
        !           284:    : FP_REGNO_P ((REGNO))                                      \
        !           285:    ? (((int) GET_MODE_CLASS (MODE) == (int) MODE_FLOAT         \
        !           286:        || (int) GET_MODE_CLASS (MODE) == (int) MODE_COMPLEX_FLOAT)     \
        !           287:       && GET_MODE_UNIT_SIZE (MODE) <= 12)                      \
        !           288:    : (int) (MODE) != (int) QImode)
        !           289: 
        !           290: /* Value is 1 if it is a good idea to tie two pseudo registers
        !           291:    when one has mode MODE1 and one has mode MODE2.
        !           292:    If HARD_REGNO_MODE_OK could produce different values for MODE1 and MODE2,
        !           293:    for any hard reg, then this must be 0 for correct output.  */
        !           294: 
        !           295: #define MODES_TIEABLE_P(MODE1, MODE2) ((MODE1) == (MODE2))
        !           296: 
        !           297: /* A C expression returning the cost of moving data from a register of class
        !           298:    CLASS1 to one of CLASS2.
        !           299: 
        !           300:    On the i386, copying between floating-point and fixed-point
        !           301:    registers is expensive.  */
        !           302: 
        !           303: #define REGISTER_MOVE_COST(CLASS1, CLASS2)                     \
        !           304:   (((FLOAT_CLASS_P (CLASS1) && ! FLOAT_CLASS_P (CLASS2))               \
        !           305:     || (! FLOAT_CLASS_P (CLASS1) && FLOAT_CLASS_P (CLASS2))) ? 10      \
        !           306:    : 2)
        !           307: 
        !           308: /* Specify the registers used for certain standard purposes.
        !           309:    The values of these macros are register numbers.  */
        !           310: 
        !           311: /* on the 386 the pc register is %eip, and is not usable as a general
        !           312:    register.  The ordinary mov instructions won't work */
        !           313: /* #define PC_REGNUM  */
        !           314: 
        !           315: /* Register to use for pushing function arguments.  */
        !           316: #define STACK_POINTER_REGNUM 7
        !           317: 
        !           318: /* Base register for access to local variables of the function.  */
        !           319: #define FRAME_POINTER_REGNUM 6
        !           320: 
        !           321: /* First floating point reg */
        !           322: #define FIRST_FLOAT_REG 8
        !           323: 
        !           324: /* First & last stack-like regs */
        !           325: #define FIRST_STACK_REG FIRST_FLOAT_REG
        !           326: #define LAST_STACK_REG (FIRST_FLOAT_REG + 7)
        !           327: 
        !           328: /* Value should be nonzero if functions must have frame pointers.
        !           329:    Zero means the frame pointer need not be set up (and parms
        !           330:    may be accessed via the stack pointer) in functions that seem suitable.
        !           331:    This is computed in `reload', in reload1.c.  */
        !           332: #define FRAME_POINTER_REQUIRED 0
        !           333: 
        !           334: /* Base register for access to arguments of the function.  */
        !           335: #define ARG_POINTER_REGNUM 16
        !           336: 
        !           337: /* Register in which static-chain is passed to a function.  */
        !           338: #define STATIC_CHAIN_REGNUM 2
        !           339: 
        !           340: /* Register to hold the addressing base for position independent
        !           341:    code access to data items.  */
        !           342: #define PIC_OFFSET_TABLE_REGNUM 3
        !           343: 
        !           344: /* Register in which address to store a structure value
        !           345:    arrives in the function.  On the 386, the prologue
        !           346:    copies this from the stack to register %eax.  */
        !           347: #define STRUCT_VALUE_INCOMING 0
        !           348: 
        !           349: /* Place in which caller passes the structure value address.
        !           350:    0 means push the value on the stack like an argument.  */
        !           351: #define STRUCT_VALUE 0
        !           352: 
        !           353: /* Define the classes of registers for register constraints in the
        !           354:    machine description.  Also define ranges of constants.
        !           355: 
        !           356:    One of the classes must always be named ALL_REGS and include all hard regs.
        !           357:    If there is more than one class, another class must be named NO_REGS
        !           358:    and contain no registers.
        !           359: 
        !           360:    The name GENERAL_REGS must be the name of a class (or an alias for
        !           361:    another name such as ALL_REGS).  This is the class of registers
        !           362:    that is allowed by "g" or "r" in a register constraint.
        !           363:    Also, registers outside this class are allocated only when
        !           364:    instructions express preferences for them.
        !           365: 
        !           366:    The classes must be numbered in nondecreasing order; that is,
        !           367:    a larger-numbered class must never be contained completely
        !           368:    in a smaller-numbered class.
        !           369: 
        !           370:    For any two classes, it is very desirable that there be another
        !           371:    class that represents their union.
        !           372: 
        !           373:    It might seem that class BREG is unnecessary, since no useful 386
        !           374:    opcode needs reg %ebx.  But some systems pass args to the OS in ebx,
        !           375:    and the "b" register constraint is useful in asms for syscalls.  */
        !           376: 
        !           377: enum reg_class
        !           378: {
        !           379:   NO_REGS,
        !           380:   AREG, DREG, CREG, BREG,
        !           381:   Q_REGS,                      /* %eax %ebx %ecx %edx */
        !           382:   SIREG, DIREG,
        !           383:   INDEX_REGS,                  /* %eax %ebx %ecx %edx %esi %edi %ebp */
        !           384:   GENERAL_REGS,                        /* %eax %ebx %ecx %edx %esi %edi %ebp %esp */
        !           385:   FP_TOP_REG, FP_SECOND_REG,   /* %st(0) %st(1) */
        !           386:   FLOAT_REGS,
        !           387:   ALL_REGS, LIM_REG_CLASSES
        !           388: };
        !           389: 
        !           390: #define N_REG_CLASSES (int) LIM_REG_CLASSES
        !           391: 
        !           392: #define FLOAT_CLASS_P(CLASS) (reg_class_subset_p (CLASS, FLOAT_REGS))
        !           393: 
        !           394: /* Give names of register classes as strings for dump file.   */
        !           395: 
        !           396: #define REG_CLASS_NAMES \
        !           397: {  "NO_REGS",                          \
        !           398:    "AREG", "DREG", "CREG", "BREG",     \
        !           399:    "Q_REGS",                           \
        !           400:    "SIREG", "DIREG",                   \
        !           401:    "INDEX_REGS",                       \
        !           402:    "GENERAL_REGS",                     \
        !           403:    "FP_TOP_REG", "FP_SECOND_REG",      \
        !           404:    "FLOAT_REGS",                       \
        !           405:    "ALL_REGS" }
        !           406: 
        !           407: /* Define which registers fit in which classes.
        !           408:    This is an initializer for a vector of HARD_REG_SET
        !           409:    of length N_REG_CLASSES.  */
        !           410: 
        !           411: #define REG_CLASS_CONTENTS \
        !           412: {      0,                                                      \
        !           413:      0x1,    0x2,  0x4,         0x8,   /* AREG, DREG, CREG, BREG */    \
        !           414:      0xf,                      /* Q_REGS */                    \
        !           415:     0x10,   0x20,              /* SIREG, DIREG */              \
        !           416:  0x1007f,                      /* INDEX_REGS */                \
        !           417:  0x100ff,                      /* GENERAL_REGS */              \
        !           418:   0x0100, 0x0200,              /* FP_TOP_REG, FP_SECOND_REG */ \
        !           419:   0xff00,                      /* FLOAT_REGS */                \
        !           420:  0x1ffff }
        !           421: 
        !           422: /* The same information, inverted:
        !           423:    Return the class number of the smallest class containing
        !           424:    reg number REGNO.  This could be a conditional expression
        !           425:    or could index an array.  */
        !           426: 
        !           427: extern enum reg_class regclass_map[FIRST_PSEUDO_REGISTER];
        !           428: #define REGNO_REG_CLASS(REGNO) (regclass_map[REGNO])
        !           429: 
        !           430: /* When defined, the compiler allows registers explicitly used in the
        !           431:    rtl to be used as spill registers but prevents the compiler from
        !           432:    extending the lifetime of these registers. */
        !           433: 
        !           434: #define SMALL_REGISTER_CLASSES
        !           435: 
        !           436: #define QI_REG_P(X) \
        !           437:   (REG_P (X) && REGNO (X) < 4)
        !           438: #define NON_QI_REG_P(X) \
        !           439:   (REG_P (X) && REGNO (X) >= 4 && REGNO (X) < FIRST_PSEUDO_REGISTER)
        !           440: 
        !           441: #define FP_REG_P(X) (REG_P (X) && FP_REGNO_P (REGNO (X)))
        !           442: #define FP_REGNO_P(n) ((n) >= FIRST_STACK_REG && (n) <= LAST_STACK_REG)
        !           443:   
        !           444: #define STACK_REG_P(xop) (REG_P (xop) &&                       \
        !           445:                          REGNO (xop) >= FIRST_STACK_REG &&     \
        !           446:                          REGNO (xop) <= LAST_STACK_REG)
        !           447: 
        !           448: #define NON_STACK_REG_P(xop) (REG_P (xop) && ! STACK_REG_P (xop))
        !           449: 
        !           450: #define STACK_TOP_P(xop) (REG_P (xop) && REGNO (xop) == FIRST_STACK_REG)
        !           451: 
        !           452: /* Try to maintain the accuracy of the death notes for regs satisfying the
        !           453:    following.  Important for stack like regs, to know when to pop. */
        !           454: 
        !           455: /* #define PRESERVE_DEATH_INFO_REGNO_P(x) FP_REGNO_P(x) */
        !           456: 
        !           457: /* 1 if register REGNO can magically overlap other regs.
        !           458:    Note that nonzero values work only in very special circumstances. */
        !           459: 
        !           460: /* #define OVERLAPPING_REGNO_P(REGNO) FP_REGNO_P (REGNO) */
        !           461: 
        !           462: /* The class value for index registers, and the one for base regs.  */
        !           463: 
        !           464: #define INDEX_REG_CLASS INDEX_REGS
        !           465: #define BASE_REG_CLASS GENERAL_REGS
        !           466: 
        !           467: /* Get reg_class from a letter such as appears in the machine description.  */
        !           468: 
        !           469: #define REG_CLASS_FROM_LETTER(C)       \
        !           470:   ((C) == 'r' ? GENERAL_REGS :                                 \
        !           471:    (C) == 'q' ? Q_REGS :                                       \
        !           472:    (C) == 'f' ? (TARGET_80387 || TARGET_FLOAT_RETURNS_IN_80387 \
        !           473:                 ? FLOAT_REGS                                   \
        !           474:                 : NO_REGS) :                                   \
        !           475:    (C) == 't' ? (TARGET_80387 || TARGET_FLOAT_RETURNS_IN_80387 \
        !           476:                 ? FP_TOP_REG                                   \
        !           477:                 : NO_REGS) :                                   \
        !           478:    (C) == 'u' ? (TARGET_80387 || TARGET_FLOAT_RETURNS_IN_80387 \
        !           479:                 ? FP_SECOND_REG                                \
        !           480:                 : NO_REGS) :                                   \
        !           481:    (C) == 'a' ? AREG :                                         \
        !           482:    (C) == 'b' ? BREG :                                         \
        !           483:    (C) == 'c' ? CREG :                                         \
        !           484:    (C) == 'd' ? DREG :                                         \
        !           485:    (C) == 'D' ? DIREG :                                                \
        !           486:    (C) == 'S' ? SIREG : NO_REGS)
        !           487: 
        !           488: /* The letters I, J, K, L and M in a register constraint string
        !           489:    can be used to stand for particular ranges of immediate operands.
        !           490:    This macro defines what the ranges are.
        !           491:    C is the letter, and VALUE is a constant value.
        !           492:    Return 1 if VALUE is in the range specified by C.
        !           493: 
        !           494:    I is for non-DImode shifts.
        !           495:    J is for DImode shifts.
        !           496:    K and L are for an `andsi' optimization.
        !           497:    M is for shifts that can be executed by the "lea" opcode.
        !           498:    */
        !           499: 
        !           500: #define CONST_OK_FOR_LETTER_P(VALUE, C)  \
        !           501:   ((C) == 'I' ? (VALUE) >= 0 && (VALUE) <= 31 :        \
        !           502:    (C) == 'J' ? (VALUE) >= 0 && (VALUE) <= 63 :        \
        !           503:    (C) == 'K' ? (VALUE) == 0xff :              \
        !           504:    (C) == 'L' ? (VALUE) == 0xffff :            \
        !           505:    (C) == 'M' ? (VALUE) >= 0 && (VALUE) <= 3 : \
        !           506:    0)
        !           507: 
        !           508: /* Similar, but for floating constants, and defining letters G and H.
        !           509:    Here VALUE is the CONST_DOUBLE rtx itself.  We allow constants even if
        !           510:    TARGET_387 isn't set, because the stack register converter may need to
        !           511:    load 0.0 into the function value register. */
        !           512: 
        !           513: #define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C)  \
        !           514:   ((C) == 'G' ? standard_80387_constant_p (VALUE) : 0)
        !           515: 
        !           516: /* Place additional restrictions on the register class to use when it
        !           517:    is necessary to be able to hold a value of mode MODE in a reload
        !           518:    register for which class CLASS would ordinarily be used. */
        !           519: 
        !           520: #define LIMIT_RELOAD_CLASS(MODE, CLASS) \
        !           521:   ((MODE) == QImode && ((CLASS) == ALL_REGS || (CLASS) == GENERAL_REGS) \
        !           522:    ? Q_REGS : (CLASS))
        !           523: 
        !           524: /* Given an rtx X being reloaded into a reg required to be
        !           525:    in class CLASS, return the class of reg to actually use.
        !           526:    In general this is just CLASS; but on some machines
        !           527:    in some cases it is preferable to use a more restrictive class.
        !           528:    On the 80386 series, we prevent floating constants from being
        !           529:    reloaded into floating registers (since no move-insn can do that)
        !           530:    and we ensure that QImodes aren't reloaded into the esi or edi reg.  */
        !           531: 
        !           532: /* Put float CONST_DOUBLE in the constant pool instead of fp regs.
        !           533:    QImode must go into class Q_REGS.
        !           534:    Narrow ALL_REGS to GENERAL_REGS.  This supports allowing movsf and
        !           535:    movdf to do mem-to-mem moves through integer regs. */
        !           536: 
        !           537: #define PREFERRED_RELOAD_CLASS(X,CLASS)        \
        !           538:   (GET_CODE (X) == CONST_DOUBLE && GET_MODE (X) != VOIDmode ? NO_REGS  \
        !           539:    : GET_MODE (X) == QImode && ! reg_class_subset_p (CLASS, Q_REGS) ? Q_REGS \
        !           540:    : ((CLASS) == ALL_REGS                                              \
        !           541:       && GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT) ? GENERAL_REGS   \
        !           542:    : (CLASS))
        !           543: 
        !           544: /* If we are copying between general and FP registers, we need a memory
        !           545:    location.  */
        !           546: 
        !           547: #define SECONDARY_MEMORY_NEEDED(CLASS1,CLASS2,MODE) \
        !           548:   ((FLOAT_CLASS_P (CLASS1) && ! FLOAT_CLASS_P (CLASS2))        \
        !           549:    || (! FLOAT_CLASS_P (CLASS1) && FLOAT_CLASS_P (CLASS2)))
        !           550: 
        !           551: /* Return the maximum number of consecutive registers
        !           552:    needed to represent mode MODE in a register of class CLASS.  */
        !           553: /* On the 80386, this is the size of MODE in words,
        !           554:    except in the FP regs, where a single reg is always enough.  */
        !           555: #define CLASS_MAX_NREGS(CLASS, MODE)   \
        !           556:  (FLOAT_CLASS_P (CLASS) ? 1 :          \
        !           557:   ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD))
        !           558: 
        !           559: /* Stack layout; function entry, exit and calling.  */
        !           560: 
        !           561: /* Define this if pushing a word on the stack
        !           562:    makes the stack pointer a smaller address.  */
        !           563: #define STACK_GROWS_DOWNWARD
        !           564: 
        !           565: /* Define this if the nominal address of the stack frame
        !           566:    is at the high-address end of the local variables;
        !           567:    that is, each additional local variable allocated
        !           568:    goes at a more negative offset in the frame.  */
        !           569: #define FRAME_GROWS_DOWNWARD
        !           570: 
        !           571: /* Offset within stack frame to start allocating local variables at.
        !           572:    If FRAME_GROWS_DOWNWARD, this is the offset to the END of the
        !           573:    first local allocated.  Otherwise, it is the offset to the BEGINNING
        !           574:    of the first local allocated.  */
        !           575: #define STARTING_FRAME_OFFSET 0
        !           576: 
        !           577: /* If we generate an insn to push BYTES bytes,
        !           578:    this says how many the stack pointer really advances by.
        !           579:    On 386 pushw decrements by exactly 2 no matter what the position was.
        !           580:    On the 386 there is no pushb; we use pushw instead, and this
        !           581:    has the effect of rounding up to 2.  */
        !           582: 
        !           583: #define PUSH_ROUNDING(BYTES) (((BYTES) + 1) & (-2))
        !           584: 
        !           585: /* Offset of first parameter from the argument pointer register value.  */
        !           586: #define FIRST_PARM_OFFSET(FNDECL) 0
        !           587: 
        !           588: /* Value is the number of bytes of arguments automatically
        !           589:    popped when returning from a subroutine call.
        !           590:    FUNTYPE is the data type of the function (as a tree),
        !           591:    or for a library call it is an identifier node for the subroutine name.
        !           592:    SIZE is the number of bytes of arguments passed on the stack.
        !           593: 
        !           594:    On the 80386, the RTD insn may be used to pop them if the number
        !           595:      of args is fixed, but if the number is variable then the caller
        !           596:      must pop them all.  RTD can't be used for library calls now
        !           597:      because the library is compiled with the Unix compiler.
        !           598:    Use of RTD is a selectable option, since it is incompatible with
        !           599:    standard Unix calling sequences.  If the option is not selected,
        !           600:    the caller must always pop the args.  */
        !           601: 
        !           602: #define RETURN_POPS_ARGS(FUNTYPE,SIZE)   \
        !           603:   (TREE_CODE (FUNTYPE) == IDENTIFIER_NODE ? 0                  \
        !           604:    : (TARGET_RTD                                               \
        !           605:       && (TYPE_ARG_TYPES (FUNTYPE) == 0                                \
        !           606:          || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (FUNTYPE))) \
        !           607:              == void_type_node))) ? (SIZE)                     \
        !           608:    : (aggregate_value_p (FUNTYPE)) ? GET_MODE_SIZE (Pmode) : 0)
        !           609: 
        !           610: /* Define how to find the value returned by a function.
        !           611:    VALTYPE is the data type of the value (as a tree).
        !           612:    If the precise function being called is known, FUNC is its FUNCTION_DECL;
        !           613:    otherwise, FUNC is 0.  */
        !           614: #define FUNCTION_VALUE(VALTYPE, FUNC)  \
        !           615:    gen_rtx (REG, TYPE_MODE (VALTYPE), \
        !           616:            VALUE_REGNO (TYPE_MODE (VALTYPE)))
        !           617: 
        !           618: /* Define how to find the value returned by a library function
        !           619:    assuming the value has mode MODE.  */
        !           620: 
        !           621: #define LIBCALL_VALUE(MODE) \
        !           622:   gen_rtx (REG, MODE, VALUE_REGNO (MODE))
        !           623: 
        !           624: /* Define the size of the result block used for communication between
        !           625:    untyped_call and untyped_return.  The block contains a DImode value
        !           626:    followed by the block used by fnsave and frstor.  */
        !           627: 
        !           628: #define APPLY_RESULT_SIZE (8+108)
        !           629: 
        !           630: /* 1 if N is a possible register number for function argument passing.
        !           631:    On the 80386, no registers are used in this way.
        !           632:       *NOTE* -mregparm does not work.
        !           633:    It exists only to test register calling conventions.  */
        !           634: 
        !           635: #define FUNCTION_ARG_REGNO_P(N) 0
        !           636: 
        !           637: /* Define a data type for recording info about an argument list
        !           638:    during the scan of that argument list.  This data type should
        !           639:    hold all necessary information about the function itself
        !           640:    and about the args processed so far, enough to enable macros
        !           641:    such as FUNCTION_ARG to determine where the next arg should go.
        !           642: 
        !           643:    On the 80386, this is a single integer, which is a number of bytes
        !           644:    of arguments scanned so far.  */
        !           645: 
        !           646: #define CUMULATIVE_ARGS int
        !           647: 
        !           648: /* Initialize a variable CUM of type CUMULATIVE_ARGS
        !           649:    for a call to a function whose data type is FNTYPE.
        !           650:    For a library call, FNTYPE is 0.
        !           651: 
        !           652:    On the 80386, the offset starts at 0.  */
        !           653: 
        !           654: #define INIT_CUMULATIVE_ARGS(CUM,FNTYPE,LIBNAME)       \
        !           655:  ((CUM) = 0)
        !           656: 
        !           657: /* Update the data in CUM to advance over an argument
        !           658:    of mode MODE and data type TYPE.
        !           659:    (TYPE is null for libcalls where that information may not be available.)  */
        !           660: 
        !           661: #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED)   \
        !           662:  ((CUM) += ((MODE) != BLKmode                  \
        !           663:            ? (GET_MODE_SIZE (MODE) + 3) & ~3   \
        !           664:            : (int_size_in_bytes (TYPE) + 3) & ~3))
        !           665: 
        !           666: /* Define where to put the arguments to a function.
        !           667:    Value is zero to push the argument on the stack,
        !           668:    or a hard register in which to store the argument.
        !           669: 
        !           670:    MODE is the argument's machine mode.
        !           671:    TYPE is the data type of the argument (as a tree).
        !           672:     This is null for libcalls where that information may
        !           673:     not be available.
        !           674:    CUM is a variable of type CUMULATIVE_ARGS which gives info about
        !           675:     the preceding args and about the function being called.
        !           676:    NAMED is nonzero if this argument is a named parameter
        !           677:     (otherwise it is an extra parameter matching an ellipsis).  */
        !           678: 
        !           679: 
        !           680: /* On the 80386 all args are pushed, except if -mregparm is specified
        !           681:    then the first two words of arguments are passed in EAX, EDX.
        !           682:    *NOTE* -mregparm does not work.
        !           683:    It exists only to test register calling conventions.  */
        !           684: 
        !           685: #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) \
        !           686: ((TARGET_REGPARM && (CUM) < 8) ? gen_rtx (REG, (MODE), (CUM) / 4) : 0)
        !           687: 
        !           688: /* For an arg passed partly in registers and partly in memory,
        !           689:    this is the number of registers used.
        !           690:    For args passed entirely in registers or entirely in memory, zero.  */
        !           691: 
        !           692: 
        !           693: #define FUNCTION_ARG_PARTIAL_NREGS(CUM, MODE, TYPE, NAMED) \
        !           694: ((TARGET_REGPARM && (CUM) < 8                                  \
        !           695:   && 8 < ((CUM) + ((MODE) == BLKmode                           \
        !           696:                      ? int_size_in_bytes (TYPE)                \
        !           697:                      : GET_MODE_SIZE (MODE))))                 \
        !           698:  ? 2 - (CUM) / 4 : 0)
        !           699: 
        !           700: /* This macro generates the assembly code for function entry.
        !           701:    FILE is a stdio stream to output the code to.
        !           702:    SIZE is an int: how many units of temporary storage to allocate.
        !           703:    Refer to the array `regs_ever_live' to determine which registers
        !           704:    to save; `regs_ever_live[I]' is nonzero if register number I
        !           705:    is ever used in the function.  This macro is responsible for
        !           706:    knowing which registers should not be saved even if used.  */
        !           707: 
        !           708: #define FUNCTION_PROLOGUE(FILE, SIZE)     \
        !           709:   function_prologue (FILE, SIZE)
        !           710: 
        !           711: /* Output assembler code to FILE to increment profiler label # LABELNO
        !           712:    for profiling a function entry.  */
        !           713: 
        !           714: #define FUNCTION_PROFILER(FILE, LABELNO)  \
        !           715: {                                                                      \
        !           716:   if (flag_pic)                                                                \
        !           717:     {                                                                  \
        !           718:       fprintf (FILE, "\tleal %sP%d@GOTOFF(%%ebx),%%edx\n",             \
        !           719:               LPREFIX, (LABELNO));                                     \
        !           720:       fprintf (FILE, "\tcall *_mcount@GOT(%%ebx)\n");                  \
        !           721:     }                                                                  \
        !           722:   else                                                                 \
        !           723:     {                                                                  \
        !           724:       fprintf (FILE, "\tmovl $%sP%d,%%edx\n", LPREFIX, (LABELNO));     \
        !           725:       fprintf (FILE, "\tcall _mcount\n");                              \
        !           726:     }                                                                  \
        !           727: }
        !           728: 
        !           729: /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
        !           730:    the stack pointer does not matter.  The value is tested only in
        !           731:    functions that have frame pointers.
        !           732:    No definition is equivalent to always zero.  */
        !           733: /* Note on the 386 it might be more efficient not to define this since 
        !           734:    we have to restore it ourselves from the frame pointer, in order to
        !           735:    use pop */
        !           736: 
        !           737: #define EXIT_IGNORE_STACK 1
        !           738: 
        !           739: /* This macro generates the assembly code for function exit,
        !           740:    on machines that need it.  If FUNCTION_EPILOGUE is not defined
        !           741:    then individual return instructions are generated for each
        !           742:    return statement.  Args are same as for FUNCTION_PROLOGUE.
        !           743: 
        !           744:    The function epilogue should not depend on the current stack pointer!
        !           745:    It should use the frame pointer only.  This is mandatory because
        !           746:    of alloca; we also take advantage of it to omit stack adjustments
        !           747:    before returning.
        !           748: 
        !           749:    If the last non-note insn in the function is a BARRIER, then there
        !           750:    is no need to emit a function prologue, because control does not fall
        !           751:    off the end.  This happens if the function ends in an "exit" call, or
        !           752:    if a `return' insn is emitted directly into the function. */
        !           753: 
        !           754: #define FUNCTION_EPILOGUE(FILE, SIZE)          \
        !           755: do {                                           \
        !           756:   rtx last = get_last_insn ();                 \
        !           757:   if (last && GET_CODE (last) == NOTE)         \
        !           758:     last = prev_nonnote_insn (last);           \
        !           759:   if (! last || GET_CODE (last) != BARRIER)    \
        !           760:     function_epilogue (FILE, SIZE);            \
        !           761: } while (0)
        !           762: 
        !           763: /* Output assembler code for a block containing the constant parts
        !           764:    of a trampoline, leaving space for the variable parts.  */
        !           765: 
        !           766: /* On the 386, the trampoline contains three instructions:
        !           767:      mov #STATIC,ecx
        !           768:      mov #FUNCTION,eax
        !           769:      jmp @eax  */
        !           770: #define TRAMPOLINE_TEMPLATE(FILE)                      \
        !           771: {                                                      \
        !           772:   ASM_OUTPUT_CHAR (FILE, GEN_INT (0xb9));              \
        !           773:   ASM_OUTPUT_SHORT (FILE, const0_rtx);                 \
        !           774:   ASM_OUTPUT_SHORT (FILE, const0_rtx);                 \
        !           775:   ASM_OUTPUT_CHAR (FILE, GEN_INT (0xb8));              \
        !           776:   ASM_OUTPUT_SHORT (FILE, const0_rtx);                 \
        !           777:   ASM_OUTPUT_SHORT (FILE, const0_rtx);                 \
        !           778:   ASM_OUTPUT_CHAR (FILE, GEN_INT (0xff));              \
        !           779:   ASM_OUTPUT_CHAR (FILE, GEN_INT (0xe0));              \
        !           780: }
        !           781: 
        !           782: /* Length in units of the trampoline for entering a nested function.  */
        !           783: 
        !           784: #define TRAMPOLINE_SIZE 12
        !           785: 
        !           786: /* Emit RTL insns to initialize the variable parts of a trampoline.
        !           787:    FNADDR is an RTX for the address of the function's pure code.
        !           788:    CXT is an RTX for the static chain value for the function.  */
        !           789: 
        !           790: #define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT)                      \
        !           791: {                                                                      \
        !           792:   emit_move_insn (gen_rtx (MEM, SImode, plus_constant (TRAMP, 1)), CXT); \
        !           793:   emit_move_insn (gen_rtx (MEM, SImode, plus_constant (TRAMP, 6)), FNADDR); \
        !           794: }
        !           795: 
        !           796: /* Definitions for register eliminations.
        !           797: 
        !           798:    This is an array of structures.  Each structure initializes one pair
        !           799:    of eliminable registers.  The "from" register number is given first,
        !           800:    followed by "to".  Eliminations of the same "from" register are listed
        !           801:    in order of preference.
        !           802: 
        !           803:    We have two registers that can be eliminated on the i386.  First, the
        !           804:    frame pointer register can often be eliminated in favor of the stack
        !           805:    pointer register.  Secondly, the argument pointer register can always be
        !           806:    eliminated; it is replaced with either the stack or frame pointer. */
        !           807: 
        !           808: #define ELIMINABLE_REGS                                \
        !           809: {{ ARG_POINTER_REGNUM, STACK_POINTER_REGNUM},  \
        !           810:  { ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM},   \
        !           811:  { FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}
        !           812: 
        !           813: /* Given FROM and TO register numbers, say whether this elimination is allowed.
        !           814:    Frame pointer elimination is automatically handled.
        !           815: 
        !           816:    For the i386, if frame pointer elimination is being done, we would like to
        !           817:    convert ap into sp, not fp.
        !           818: 
        !           819:    All other eliminations are valid.  */
        !           820: 
        !           821: #define CAN_ELIMINATE(FROM, TO)                                        \
        !           822:  ((FROM) == ARG_POINTER_REGNUM && (TO) == STACK_POINTER_REGNUM \
        !           823:   ? ! frame_pointer_needed                                     \
        !           824:   : 1)
        !           825: 
        !           826: /* Define the offset between two registers, one to be eliminated, and the other
        !           827:    its replacement, at the start of a routine.  */
        !           828: 
        !           829: #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET)                   \
        !           830: {                                                                      \
        !           831:   if ((FROM) == ARG_POINTER_REGNUM && (TO) == FRAME_POINTER_REGNUM)    \
        !           832:     (OFFSET) = 8;      /* Skip saved PC and previous frame pointer */  \
        !           833:   else                                                                 \
        !           834:     {                                                                  \
        !           835:       int regno;                                                       \
        !           836:       int offset = 0;                                                  \
        !           837:                                                                        \
        !           838:       for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)          \
        !           839:        if ((regs_ever_live[regno] && ! call_used_regs[regno])          \
        !           840:            || (current_function_uses_pic_offset_table                  \
        !           841:                && regno == PIC_OFFSET_TABLE_REGNUM))                   \
        !           842:          offset += 4;                                                  \
        !           843:                                                                        \
        !           844:       (OFFSET) = offset + get_frame_size ();                           \
        !           845:                                                                        \
        !           846:       if ((FROM) == ARG_POINTER_REGNUM && (TO) == STACK_POINTER_REGNUM)        \
        !           847:        (OFFSET) += 4;  /* Skip saved PC */                             \
        !           848:     }                                                                  \
        !           849: }
        !           850: 
        !           851: /* Addressing modes, and classification of registers for them.  */
        !           852: 
        !           853: /* #define HAVE_POST_INCREMENT */
        !           854: /* #define HAVE_POST_DECREMENT */
        !           855: 
        !           856: /* #define HAVE_PRE_DECREMENT */
        !           857: /* #define HAVE_PRE_INCREMENT */
        !           858: 
        !           859: /* Macros to check register numbers against specific register classes.  */
        !           860: 
        !           861: /* These assume that REGNO is a hard or pseudo reg number.
        !           862:    They give nonzero only if REGNO is a hard reg of the suitable class
        !           863:    or a pseudo reg currently allocated to a suitable hard reg.
        !           864:    Since they use reg_renumber, they are safe only once reg_renumber
        !           865:    has been allocated, which happens in local-alloc.c.  */
        !           866: 
        !           867: #define REGNO_OK_FOR_INDEX_P(REGNO) \
        !           868:   ((REGNO) < STACK_POINTER_REGNUM \
        !           869:    || (unsigned) reg_renumber[REGNO] < STACK_POINTER_REGNUM)
        !           870: 
        !           871: #define REGNO_OK_FOR_BASE_P(REGNO) \
        !           872:   ((REGNO) <= STACK_POINTER_REGNUM \
        !           873:    || (REGNO) == ARG_POINTER_REGNUM \
        !           874:    || (unsigned) reg_renumber[REGNO] <= STACK_POINTER_REGNUM)
        !           875: 
        !           876: #define REGNO_OK_FOR_SIREG_P(REGNO) ((REGNO) == 4 || reg_renumber[REGNO] == 4)
        !           877: #define REGNO_OK_FOR_DIREG_P(REGNO) ((REGNO) == 5 || reg_renumber[REGNO] == 5)
        !           878: 
        !           879: /* The macros REG_OK_FOR..._P assume that the arg is a REG rtx
        !           880:    and check its validity for a certain class.
        !           881:    We have two alternate definitions for each of them.
        !           882:    The usual definition accepts all pseudo regs; the other rejects
        !           883:    them unless they have been allocated suitable hard regs.
        !           884:    The symbol REG_OK_STRICT causes the latter definition to be used.
        !           885: 
        !           886:    Most source files want to accept pseudo regs in the hope that
        !           887:    they will get allocated to the class that the insn wants them to be in.
        !           888:    Source files for reload pass need to be strict.
        !           889:    After reload, it makes no difference, since pseudo regs have
        !           890:    been eliminated by then.  */
        !           891: 
        !           892: #ifndef REG_OK_STRICT
        !           893: 
        !           894: /* Nonzero if X is a hard reg that can be used as an index or if
        !           895:    it is a pseudo reg.  */
        !           896: 
        !           897: #define REG_OK_FOR_INDEX_P(X) \
        !           898:   (REGNO (X) < STACK_POINTER_REGNUM \
        !           899:    || REGNO (X) >= FIRST_PSEUDO_REGISTER)
        !           900: 
        !           901: /* Nonzero if X is a hard reg that can be used as a base reg
        !           902:    of if it is a pseudo reg.  */
        !           903:   /* ?wfs */
        !           904: 
        !           905: #define REG_OK_FOR_BASE_P(X) \
        !           906:   (REGNO (X) <= STACK_POINTER_REGNUM \
        !           907:    || REGNO (X) == ARG_POINTER_REGNUM \
        !           908:    || REGNO(X) >= FIRST_PSEUDO_REGISTER)
        !           909: 
        !           910: #define REG_OK_FOR_STRREG_P(X) \
        !           911:   (REGNO (X) == 4 || REGNO (X) == 5 || REGNO (X) >= FIRST_PSEUDO_REGISTER)
        !           912: 
        !           913: #else
        !           914: 
        !           915: /* Nonzero if X is a hard reg that can be used as an index.  */
        !           916: #define REG_OK_FOR_INDEX_P(X) REGNO_OK_FOR_INDEX_P (REGNO (X))
        !           917: /* Nonzero if X is a hard reg that can be used as a base reg.  */
        !           918: #define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
        !           919: #define REG_OK_FOR_STRREG_P(X) \
        !           920:   (REGNO_OK_FOR_DIREG_P (REGNO (X)) || REGNO_OK_FOR_SIREG_P (REGNO (X)))
        !           921: 
        !           922: #endif
        !           923: 
        !           924: /* GO_IF_LEGITIMATE_ADDRESS recognizes an RTL expression
        !           925:    that is a valid memory address for an instruction.
        !           926:    The MODE argument is the machine mode for the MEM expression
        !           927:    that wants to use this address.
        !           928: 
        !           929:    The other macros defined here are used only in GO_IF_LEGITIMATE_ADDRESS,
        !           930:    except for CONSTANT_ADDRESS_P which is usually machine-independent.
        !           931: 
        !           932:    See legitimize_pic_address in i386.c for details as to what
        !           933:    constitutes a legitimate address when -fpic is used.  */
        !           934: 
        !           935: #define MAX_REGS_PER_ADDRESS 2
        !           936: 
        !           937: #define CONSTANT_ADDRESS_P(X)   \
        !           938:   (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF             \
        !           939:    || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST               \
        !           940:    || GET_CODE (X) == HIGH)
        !           941: 
        !           942: /* Nonzero if the constant value X is a legitimate general operand.
        !           943:    It is given that X satisfies CONSTANT_P or is a CONST_DOUBLE.  */
        !           944: 
        !           945: #define LEGITIMATE_CONSTANT_P(X) 1
        !           946: 
        !           947: #define GO_IF_INDEXABLE_BASE(X, ADDR)  \
        !           948:  if (GET_CODE (X) == REG && REG_OK_FOR_BASE_P (X)) goto ADDR
        !           949: 
        !           950: #define LEGITIMATE_INDEX_REG_P(X)   \
        !           951:   (GET_CODE (X) == REG && REG_OK_FOR_INDEX_P (X))
        !           952: 
        !           953: /* Return 1 if X is an index or an index times a scale.  */
        !           954: 
        !           955: #define LEGITIMATE_INDEX_P(X)   \
        !           956:    (LEGITIMATE_INDEX_REG_P (X)                         \
        !           957:     || (GET_CODE (X) == MULT                           \
        !           958:        && LEGITIMATE_INDEX_REG_P (XEXP (X, 0))         \
        !           959:        && GET_CODE (XEXP (X, 1)) == CONST_INT          \
        !           960:        && (INTVAL (XEXP (X, 1)) == 2                   \
        !           961:            || INTVAL (XEXP (X, 1)) == 4                \
        !           962:            || INTVAL (XEXP (X, 1)) == 8)))
        !           963: 
        !           964: /* Go to ADDR if X is an index term, a base reg, or a sum of those.  */
        !           965: 
        !           966: #define GO_IF_INDEXING(X, ADDR)        \
        !           967: { if (LEGITIMATE_INDEX_P (X)) goto ADDR;                               \
        !           968:   GO_IF_INDEXABLE_BASE (X, ADDR);                                      \
        !           969:   if (GET_CODE (X) == PLUS && LEGITIMATE_INDEX_P (XEXP (X, 0)))                \
        !           970:     { GO_IF_INDEXABLE_BASE (XEXP (X, 1), ADDR); }                      \
        !           971:   if (GET_CODE (X) == PLUS && LEGITIMATE_INDEX_P (XEXP (X, 1)))                \
        !           972:     { GO_IF_INDEXABLE_BASE (XEXP (X, 0), ADDR); } }
        !           973: 
        !           974: /* We used to allow this, but it isn't ever used.
        !           975:    || ((GET_CODE (X) == POST_DEC || GET_CODE (X) == POST_INC)          \
        !           976:        && REG_P (XEXP (X, 0))                                          \
        !           977:        && REG_OK_FOR_STRREG_P (XEXP (X, 0)))                           \
        !           978: */
        !           979: 
        !           980: #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, ADDR)        \
        !           981: {                                                                      \
        !           982:   if (CONSTANT_ADDRESS_P (X)                                           \
        !           983:       && (! flag_pic || LEGITIMATE_PIC_OPERAND_P (X)))                 \
        !           984:     goto ADDR;                                                         \
        !           985:   GO_IF_INDEXING (X, ADDR);                                            \
        !           986:   if (GET_CODE (X) == PLUS && CONSTANT_ADDRESS_P (XEXP (X, 1)))                \
        !           987:     {                                                                  \
        !           988:       rtx x0 = XEXP (X, 0);                                            \
        !           989:       if (! flag_pic || ! SYMBOLIC_CONST (XEXP (X, 1)))                        \
        !           990:        { GO_IF_INDEXING (x0, ADDR); }                                  \
        !           991:       else if (x0 == pic_offset_table_rtx)                             \
        !           992:        goto ADDR;                                                      \
        !           993:       else if (GET_CODE (x0) == PLUS)                                  \
        !           994:        {                                                               \
        !           995:          if (XEXP (x0, 0) == pic_offset_table_rtx)                     \
        !           996:            { GO_IF_INDEXABLE_BASE (XEXP (x0, 1), ADDR); }              \
        !           997:          if (XEXP (x0, 1) == pic_offset_table_rtx)                     \
        !           998:            { GO_IF_INDEXABLE_BASE (XEXP (x0, 0), ADDR); }              \
        !           999:        }                                                               \
        !          1000:     }                                                                  \
        !          1001: }
        !          1002: 
        !          1003: /* Try machine-dependent ways of modifying an illegitimate address
        !          1004:    to be legitimate.  If we find one, return the new, valid address.
        !          1005:    This macro is used in only one place: `memory_address' in explow.c.
        !          1006: 
        !          1007:    OLDX is the address as it was before break_out_memory_refs was called.
        !          1008:    In some cases it is useful to look at this to decide what needs to be done.
        !          1009: 
        !          1010:    MODE and WIN are passed so that this macro can use
        !          1011:    GO_IF_LEGITIMATE_ADDRESS.
        !          1012: 
        !          1013:    It is always safe for this macro to do nothing.  It exists to recognize
        !          1014:    opportunities to optimize the output.
        !          1015: 
        !          1016:    For the 80386, we handle X+REG by loading X into a register R and
        !          1017:    using R+REG.  R will go in a general reg and indexing will be used.
        !          1018:    However, if REG is a broken-out memory address or multiplication,
        !          1019:    nothing needs to be done because REG can certainly go in a general reg.
        !          1020: 
        !          1021:    When -fpic is used, special handling is needed for symbolic references.
        !          1022:    See comments by legitimize_pic_address in i386.c for details.  */
        !          1023: 
        !          1024: #define LEGITIMIZE_ADDRESS(X,OLDX,MODE,WIN)   \
        !          1025: { extern rtx legitimize_pic_address ();                                        \
        !          1026:   int ch = (X) != (OLDX);                                              \
        !          1027:   if (flag_pic && SYMBOLIC_CONST (X))                                  \
        !          1028:     {                                                                  \
        !          1029:       (X) = legitimize_pic_address (X, 0);                             \
        !          1030:       if (memory_address_p (MODE, X))                                  \
        !          1031:        goto WIN;                                                       \
        !          1032:     }                                                                  \
        !          1033:   if (GET_CODE (X) == PLUS)                                            \
        !          1034:     { if (GET_CODE (XEXP (X, 0)) == MULT)                              \
        !          1035:        ch = 1, XEXP (X, 0) = force_operand (XEXP (X, 0), 0);           \
        !          1036:       if (GET_CODE (XEXP (X, 1)) == MULT)                              \
        !          1037:        ch = 1, XEXP (X, 1) = force_operand (XEXP (X, 1), 0);           \
        !          1038:       if (ch && GET_CODE (XEXP (X, 1)) == REG                          \
        !          1039:          && GET_CODE (XEXP (X, 0)) == REG)                             \
        !          1040:        goto WIN;                                                       \
        !          1041:       if (flag_pic && SYMBOLIC_CONST (XEXP (X, 1)))                    \
        !          1042:         ch = 1, (X) = legitimize_pic_address (X, 0);                   \
        !          1043:       if (ch) { GO_IF_LEGITIMATE_ADDRESS (MODE, X, WIN); }             \
        !          1044:       if (GET_CODE (XEXP (X, 0)) == REG)                                \
        !          1045:        { register rtx temp = gen_reg_rtx (Pmode);                      \
        !          1046:          register rtx val = force_operand (XEXP (X, 1), temp);         \
        !          1047:          if (val != temp) emit_move_insn (temp, val);                  \
        !          1048:          XEXP (X, 1) = temp;                                           \
        !          1049:          goto WIN; }                                                   \
        !          1050:       else if (GET_CODE (XEXP (X, 1)) == REG)                          \
        !          1051:        { register rtx temp = gen_reg_rtx (Pmode);                      \
        !          1052:          register rtx val = force_operand (XEXP (X, 0), temp);         \
        !          1053:          if (val != temp) emit_move_insn (temp, val);                  \
        !          1054:          XEXP (X, 0) = temp;                                           \
        !          1055:          goto WIN; }}}
        !          1056: 
        !          1057: /* Nonzero if the constant value X is a legitimate general operand
        !          1058:    when generating PIC code.  It is given that flag_pic is on and 
        !          1059:    that X satisfies CONSTANT_P or is a CONST_DOUBLE.  */
        !          1060: 
        !          1061: #define LEGITIMATE_PIC_OPERAND_P(X) \
        !          1062:   (! SYMBOLIC_CONST (X)                                                        \
        !          1063:    || (GET_CODE (X) == SYMBOL_REF && CONSTANT_POOL_ADDRESS_P (X)))
        !          1064: 
        !          1065: #define SYMBOLIC_CONST(X)      \
        !          1066: (GET_CODE (X) == SYMBOL_REF                                            \
        !          1067:  || GET_CODE (X) == LABEL_REF                                          \
        !          1068:  || (GET_CODE (X) == CONST && symbolic_reference_mentioned_p (X)))
        !          1069: 
        !          1070: /* Go to LABEL if ADDR (a legitimate address expression)
        !          1071:    has an effect that depends on the machine mode it is used for.
        !          1072:    On the 80386, only postdecrement and postincrement address depend thus
        !          1073:    (the amount of decrement or increment being the length of the operand).  */
        !          1074: #define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR,LABEL)       \
        !          1075:  if (GET_CODE (ADDR) == POST_INC || GET_CODE (ADDR) == POST_DEC) goto LABEL
        !          1076: 
        !          1077: /* Define this macro if references to a symbol must be treated
        !          1078:    differently depending on something about the variable or
        !          1079:    function named by the symbol (such as what section it is in).
        !          1080: 
        !          1081:    On i386, if using PIC, mark a SYMBOL_REF for a non-global symbol
        !          1082:    so that we may access it directly in the GOT.  */
        !          1083: 
        !          1084: #define ENCODE_SECTION_INFO(DECL) \
        !          1085: do                                                                     \
        !          1086:   {                                                                    \
        !          1087:     if (flag_pic)                                                      \
        !          1088:       {                                                                        \
        !          1089:        rtx rtl = (TREE_CODE_CLASS (TREE_CODE (DECL)) != 'd'            \
        !          1090:                   ? TREE_CST_RTL (DECL) : DECL_RTL (DECL));            \
        !          1091:        SYMBOL_REF_FLAG (XEXP (rtl, 0))                                 \
        !          1092:          = (TREE_CODE_CLASS (TREE_CODE (DECL)) != 'd'                  \
        !          1093:             || ! TREE_PUBLIC (DECL));                                  \
        !          1094:       }                                                                        \
        !          1095:   }                                                                    \
        !          1096: while (0)
        !          1097: 
        !          1098: /* Initialize data used by insn expanders.  This is called from
        !          1099:    init_emit, once for each function, before code is generated.
        !          1100:    For 386, clear stack slot assignments remembered from previous
        !          1101:    functions. */
        !          1102: 
        !          1103: #define INIT_EXPANDERS clear_386_stack_locals ()
        !          1104: 
        !          1105: /* Specify the machine mode that this machine uses
        !          1106:    for the index in the tablejump instruction.  */
        !          1107: #define CASE_VECTOR_MODE Pmode
        !          1108: 
        !          1109: /* Define this if the tablejump instruction expects the table
        !          1110:    to contain offsets from the address of the table.
        !          1111:    Do not define this if the table should contain absolute addresses.  */
        !          1112: /* #define CASE_VECTOR_PC_RELATIVE */
        !          1113: 
        !          1114: /* Specify the tree operation to be used to convert reals to integers.
        !          1115:    This should be changed to take advantage of fist --wfs ??
        !          1116:  */
        !          1117: #define IMPLICIT_FIX_EXPR FIX_ROUND_EXPR
        !          1118: 
        !          1119: /* This is the kind of divide that is easiest to do in the general case.  */
        !          1120: #define EASY_DIV_EXPR TRUNC_DIV_EXPR
        !          1121: 
        !          1122: /* Define this as 1 if `char' should by default be signed; else as 0.  */
        !          1123: #define DEFAULT_SIGNED_CHAR 1
        !          1124: 
        !          1125: /* Max number of bytes we can move from memory to memory
        !          1126:    in one reasonably fast instruction.  */
        !          1127: #define MOVE_MAX 4
        !          1128: 
        !          1129: /* MOVE_RATIO is the number of move instructions that is better than a
        !          1130:    block move.  Make this large on i386, since the block move is very
        !          1131:    inefficient with small blocks, and the hard register needs of the
        !          1132:    block move require much reload work. */
        !          1133: #define MOVE_RATIO 5
        !          1134: 
        !          1135: /* Define this if zero-extension is slow (more than one real instruction).  */
        !          1136: /* #define SLOW_ZERO_EXTEND */
        !          1137: 
        !          1138: /* Nonzero if access to memory by bytes is slow and undesirable.  */
        !          1139: #define SLOW_BYTE_ACCESS 0
        !          1140: 
        !          1141: /* Define if shifts truncate the shift count
        !          1142:    which implies one can omit a sign-extension or zero-extension
        !          1143:    of a shift count.  */
        !          1144: /* One i386, shifts do truncate the count.  But bit opcodes don't. */
        !          1145: 
        !          1146: /* #define SHIFT_COUNT_TRUNCATED */
        !          1147: 
        !          1148: /* Value is 1 if truncating an integer of INPREC bits to OUTPREC bits
        !          1149:    is done just by pretending it is already truncated.  */
        !          1150: #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
        !          1151: 
        !          1152: /* We assume that the store-condition-codes instructions store 0 for false
        !          1153:    and some other value for true.  This is the value stored for true.  */
        !          1154: 
        !          1155: #define STORE_FLAG_VALUE 1
        !          1156: 
        !          1157: /* When a prototype says `char' or `short', really pass an `int'.
        !          1158:    (The 386 can't easily push less than an int.)  */
        !          1159: 
        !          1160: #define PROMOTE_PROTOTYPES
        !          1161: 
        !          1162: /* Specify the machine mode that pointers have.
        !          1163:    After generation of rtl, the compiler makes no further distinction
        !          1164:    between pointers and any other objects of this machine mode.  */
        !          1165: #define Pmode SImode
        !          1166: 
        !          1167: /* A function address in a call instruction
        !          1168:    is a byte address (for indexing purposes)
        !          1169:    so give the MEM rtx a byte's mode.  */
        !          1170: #define FUNCTION_MODE QImode
        !          1171: 
        !          1172: /* Define this if addresses of constant functions
        !          1173:    shouldn't be put through pseudo regs where they can be cse'd.
        !          1174:    Desirable on the 386 because a CALL with a constant address is
        !          1175:    not much slower than one with a register address.  */
        !          1176: #define NO_FUNCTION_CSE
        !          1177: 
        !          1178: /* Provide the costs of a rtl expression.  This is in the body of a
        !          1179:    switch on CODE. */
        !          1180: 
        !          1181: #define RTX_COSTS(X,CODE,OUTER_CODE)                   \
        !          1182:   case MULT:                                           \
        !          1183:     return COSTS_N_INSNS (10);                         \
        !          1184:   case DIV:                                            \
        !          1185:   case UDIV:                                           \
        !          1186:   case MOD:                                            \
        !          1187:   case UMOD:                                           \
        !          1188:     return COSTS_N_INSNS (40);                         \
        !          1189:   case PLUS:                                           \
        !          1190:     if (GET_CODE (XEXP (X, 0)) == REG                  \
        !          1191:         && GET_CODE (XEXP (X, 1)) == CONST_INT)                \
        !          1192:       return 1;                                                \
        !          1193:     break;
        !          1194: 
        !          1195: 
        !          1196: /* Compute the cost of computing a constant rtl expression RTX
        !          1197:    whose rtx-code is CODE.  The body of this macro is a portion
        !          1198:    of a switch statement.  If the code is computed here,
        !          1199:    return it with a return statement.  Otherwise, break from the switch.  */
        !          1200: 
        !          1201: #define CONST_COSTS(RTX,CODE,OUTER_CODE) \
        !          1202:   case CONST_INT:                                              \
        !          1203:   case CONST:                                                  \
        !          1204:   case LABEL_REF:                                              \
        !          1205:   case SYMBOL_REF:                                             \
        !          1206:     return flag_pic && SYMBOLIC_CONST (RTX) ? 2 : 0;           \
        !          1207:   case CONST_DOUBLE:                                           \
        !          1208:     {                                                          \
        !          1209:       int code;                                                        \
        !          1210:       if (GET_MODE (RTX) == VOIDmode)                          \
        !          1211:        return 2;                                               \
        !          1212:       code = standard_80387_constant_p (RTX);                  \
        !          1213:       return code == 1 ? 0 :                                   \
        !          1214:             code == 2 ? 1 :                                    \
        !          1215:                         2;                                     \
        !          1216:     }
        !          1217: 
        !          1218: /* Compute the cost of an address.  This is meant to approximate the size
        !          1219:    and/or execution delay of an insn using that address.  If the cost is
        !          1220:    approximated by the RTL complexity, including CONST_COSTS above, as
        !          1221:    is usually the case for CISC machines, this macro should not be defined.
        !          1222:    For aggressively RISCy machines, only one insn format is allowed, so
        !          1223:    this macro should be a constant.  The value of this macro only matters
        !          1224:    for valid addresses.
        !          1225: 
        !          1226:    For i386, it is better to use a complex address than let gcc copy
        !          1227:    the address into a reg and make a new pseudo.  But not if the address
        !          1228:    requires to two regs - that would mean more pseudos with longer
        !          1229:    lifetimes.  */
        !          1230: 
        !          1231: #define ADDRESS_COST(RTX) \
        !          1232:   ((CONSTANT_P (RTX)                                           \
        !          1233:     || (GET_CODE (RTX) == PLUS && CONSTANT_P (XEXP (RTX, 1))   \
        !          1234:        && REG_P (XEXP (RTX, 0)))) ? 0                          \
        !          1235:    : REG_P (RTX) ? 1                                           \
        !          1236:    : 2)
        !          1237: 
        !          1238: /* Add any extra modes needed to represent the condition code.
        !          1239: 
        !          1240:    For the i386, we need separate modes when floating-point equality
        !          1241:    comparisons are being done.  */
        !          1242: 
        !          1243: #define EXTRA_CC_MODES CCFPEQmode
        !          1244: 
        !          1245: /* Define the names for the modes specified above.  */
        !          1246: #define EXTRA_CC_NAMES "CCFPEQ"
        !          1247: 
        !          1248: /* Given a comparison code (EQ, NE, etc.) and the first operand of a COMPARE,
        !          1249:    return the mode to be used for the comparison.
        !          1250: 
        !          1251:    For floating-point equality comparisons, CCFPEQmode should be used.
        !          1252:    VOIDmode should be used in all other cases.  */
        !          1253: 
        !          1254: #define SELECT_CC_MODE(OP,X,Y) \
        !          1255:   (GET_MODE_CLASS (GET_MODE (X)) == MODE_FLOAT                 \
        !          1256:    && ((OP) == EQ || (OP) == NE) ? CCFPEQmode : VOIDmode)
        !          1257: 
        !          1258: /* Define the information needed to generate branch and scc insns.  This is
        !          1259:    stored from the compare operation.  Note that we can't use "rtx" here
        !          1260:    since it hasn't been defined!  */
        !          1261: 
        !          1262: extern struct rtx_def *i386_compare_op0, *i386_compare_op1;
        !          1263: extern struct rtx_def *(*i386_compare_gen)(), *(*i386_compare_gen_eq)();
        !          1264: 
        !          1265: /* Tell final.c how to eliminate redundant test instructions.  */
        !          1266: 
        !          1267: /* Here we define machine-dependent flags and fields in cc_status
        !          1268:    (see `conditions.h').  */
        !          1269: 
        !          1270: /* Set if the cc value is actually in the 80387, so a floating point
        !          1271:    conditional branch must be output.  */
        !          1272: #define CC_IN_80387 04000
        !          1273: 
        !          1274: /* Set if the CC value was stored in a nonstandard way, so that
        !          1275:    the state of equality is indicated by zero in the carry bit.  */
        !          1276: #define CC_Z_IN_NOT_C 010000
        !          1277: 
        !          1278: /* Store in cc_status the expressions
        !          1279:    that the condition codes will describe
        !          1280:    after execution of an instruction whose pattern is EXP.
        !          1281:    Do not alter them if the instruction would not alter the cc's.  */
        !          1282: 
        !          1283: #define NOTICE_UPDATE_CC(EXP, INSN) \
        !          1284:   notice_update_cc((EXP))
        !          1285: 
        !          1286: /* Output a signed jump insn.  Use template NORMAL ordinarily, or
        !          1287:    FLOAT following a floating point comparison.
        !          1288:    Use NO_OV following an arithmetic insn that set the cc's
        !          1289:    before a test insn that was deleted.
        !          1290:    NO_OV may be zero, meaning final should reinsert the test insn
        !          1291:    because the jump cannot be handled properly without it.  */
        !          1292: 
        !          1293: #define OUTPUT_JUMP(NORMAL, FLOAT, NO_OV)                      \
        !          1294: {                                                              \
        !          1295:   if (cc_prev_status.flags & CC_IN_80387)                      \
        !          1296:     return FLOAT;                                              \
        !          1297:   if (cc_prev_status.flags & CC_NO_OVERFLOW)                   \
        !          1298:     return NO_OV;                                              \
        !          1299:   return NORMAL;                                               \
        !          1300: }
        !          1301: 
        !          1302: /* Control the assembler format that we output, to the extent
        !          1303:    this does not vary between assemblers.  */
        !          1304: 
        !          1305: /* How to refer to registers in assembler output.
        !          1306:    This sequence is indexed by compiler's hard-register-number (see above). */
        !          1307: 
        !          1308: /* In order to refer to the first 8 regs as 32 bit regs prefix an "e"
        !          1309:    For non floating point regs, the following are the HImode names.
        !          1310: 
        !          1311:    For float regs, the stack top is sometimes referred to as "%st(0)"
        !          1312:    instead of just "%st".  PRINT_REG handles this with the "y" code.  */
        !          1313: 
        !          1314: #define HI_REGISTER_NAMES \
        !          1315: {"ax","dx","cx","bx","si","di","bp","sp",          \
        !          1316:  "st","st(1)","st(2)","st(3)","st(4)","st(5)","st(6)","st(7)","" }
        !          1317: 
        !          1318: #define REGISTER_NAMES HI_REGISTER_NAMES
        !          1319: 
        !          1320: /* Table of additional register names to use in user input.  */
        !          1321: 
        !          1322: #define ADDITIONAL_REGISTER_NAMES \
        !          1323: { "eax", 0, "edx", 1, "ecx", 2, "ebx", 3,      \
        !          1324:   "esi", 4, "edi", 5, "ebp", 6, "esp", 7,      \
        !          1325:   "al", 0, "dl", 1, "cl", 2, "bl", 3,          \
        !          1326:   "ah", 0, "dh", 1, "ch", 2, "bh", 3 }
        !          1327: 
        !          1328: /* Note we are omitting these since currently I don't know how
        !          1329: to get gcc to use these, since they want the same but different
        !          1330: number as al, and ax.
        !          1331: */
        !          1332: 
        !          1333: /* note the last four are not really qi_registers, but
        !          1334:    the md will have to never output movb into one of them
        !          1335:    only a movw .  There is no movb into the last four regs */
        !          1336: 
        !          1337: #define QI_REGISTER_NAMES \
        !          1338: {"al", "dl", "cl", "bl", "si", "di", "bp", "sp",}
        !          1339: 
        !          1340: /* These parallel the array above, and can be used to access bits 8:15
        !          1341:    of regs 0 through 3. */
        !          1342: 
        !          1343: #define QI_HIGH_REGISTER_NAMES \
        !          1344: {"ah", "dh", "ch", "bh", }
        !          1345: 
        !          1346: /* How to renumber registers for dbx and gdb.  */
        !          1347: 
        !          1348: /* {0,2,1,3,6,7,4,5,12,13,14,15,16,17}  */
        !          1349: #define DBX_REGISTER_NUMBER(n) \
        !          1350: ((n) == 0 ? 0 : \
        !          1351:  (n) == 1 ? 2 : \
        !          1352:  (n) == 2 ? 1 : \
        !          1353:  (n) == 3 ? 3 : \
        !          1354:  (n) == 4 ? 6 : \
        !          1355:  (n) == 5 ? 7 : \
        !          1356:  (n) == 6 ? 4 : \
        !          1357:  (n) == 7 ? 5 : \
        !          1358:  (n) + 4)
        !          1359: 
        !          1360: /* This is how to output the definition of a user-level label named NAME,
        !          1361:    such as the label on a static function or variable NAME.  */
        !          1362: 
        !          1363: #define ASM_OUTPUT_LABEL(FILE,NAME)    \
        !          1364:   (assemble_name (FILE, NAME), fputs (":\n", FILE))
        !          1365: 
        !          1366: /* This is how to output an assembler line defining a `double' constant.  */
        !          1367: 
        !          1368: #define ASM_OUTPUT_DOUBLE(FILE,VALUE)  \
        !          1369:   fprintf (FILE, "%s %.22e\n", ASM_DOUBLE, (VALUE))
        !          1370: 
        !          1371: 
        !          1372: /* This is how to output an assembler line defining a `float' constant.  */
        !          1373: 
        !          1374: #define ASM_OUTPUT_FLOAT(FILE,VALUE)  \
        !          1375: do { union { float f; long l;} tem;                    \
        !          1376:      tem.f = (VALUE);                                  \
        !          1377:      fprintf((FILE), "%s 0x%x\n", ASM_LONG, tem.l);    \
        !          1378:    } while (0)
        !          1379: 
        !          1380: 
        !          1381: /* Store in OUTPUT a string (made with alloca) containing
        !          1382:    an assembler-name for a local static variable named NAME.
        !          1383:    LABELNO is an integer which is different for each call.  */
        !          1384: 
        !          1385: #define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO) \
        !          1386: ( (OUTPUT) = (char *) alloca (strlen ((NAME)) + 10),   \
        !          1387:   sprintf ((OUTPUT), "%s.%d", (NAME), (LABELNO)))
        !          1388: 
        !          1389: 
        !          1390: 
        !          1391: /* This is how to output an assembler line defining an `int' constant.  */
        !          1392: 
        !          1393: #define ASM_OUTPUT_INT(FILE,VALUE)  \
        !          1394: ( fprintf (FILE, "%s ", ASM_LONG),             \
        !          1395:   output_addr_const (FILE,(VALUE)),            \
        !          1396:   putc('\n',FILE))
        !          1397: 
        !          1398: /* Likewise for `char' and `short' constants.  */
        !          1399: /* is this supposed to do align too?? */
        !          1400: 
        !          1401: #define ASM_OUTPUT_SHORT(FILE,VALUE)  \
        !          1402: ( fprintf (FILE, "%s ", ASM_SHORT),            \
        !          1403:   output_addr_const (FILE,(VALUE)),            \
        !          1404:   putc('\n',FILE))
        !          1405: 
        !          1406: /*
        !          1407: #define ASM_OUTPUT_SHORT(FILE,VALUE)  \
        !          1408: ( fprintf (FILE, "%s ", ASM_BYTE_OP),          \
        !          1409:   output_addr_const (FILE,(VALUE)),            \
        !          1410:   fputs (",", FILE),                           \
        !          1411:   output_addr_const (FILE,(VALUE)),            \
        !          1412:   fputs (" >> 8\n",FILE))
        !          1413: */
        !          1414: 
        !          1415: 
        !          1416: #define ASM_OUTPUT_CHAR(FILE,VALUE)  \
        !          1417: ( fprintf (FILE, "%s ", ASM_BYTE_OP),          \
        !          1418:   output_addr_const (FILE, (VALUE)),           \
        !          1419:   putc ('\n', FILE))
        !          1420: 
        !          1421: /* This is how to output an assembler line for a numeric constant byte.  */
        !          1422: 
        !          1423: #define ASM_OUTPUT_BYTE(FILE,VALUE)  \
        !          1424:   fprintf ((FILE), "%s 0x%x\n", ASM_BYTE_OP, (VALUE))
        !          1425: 
        !          1426: /* This is how to output an insn to push a register on the stack.
        !          1427:    It need not be very fast code.  */
        !          1428: 
        !          1429: #define ASM_OUTPUT_REG_PUSH(FILE,REGNO)  \
        !          1430:   fprintf (FILE, "\tpushl e%s\n", reg_names[REGNO])
        !          1431: 
        !          1432: /* This is how to output an insn to pop a register from the stack.
        !          1433:    It need not be very fast code.  */
        !          1434: 
        !          1435: #define ASM_OUTPUT_REG_POP(FILE,REGNO)  \
        !          1436:   fprintf (FILE, "\tpopl e%s\n", reg_names[REGNO])
        !          1437: 
        !          1438: /* This is how to output an element of a case-vector that is absolute.
        !          1439:      */
        !          1440: 
        !          1441: #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
        !          1442:   fprintf (FILE, "%s %s%d\n", ASM_LONG, LPREFIX, VALUE)
        !          1443: 
        !          1444: /* This is how to output an element of a case-vector that is relative.
        !          1445:    We don't use these on the 386 yet, because the ATT assembler can't do
        !          1446:    forward reference the differences.  
        !          1447:  */
        !          1448: 
        !          1449: #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, VALUE, REL) \
        !          1450:   fprintf (FILE, "\t.word %s%d-%s%d\n",LPREFIX, VALUE,LPREFIX, REL)
        !          1451: 
        !          1452: /* Define the parentheses used to group arithmetic operations
        !          1453:    in assembler code.  */
        !          1454: 
        !          1455: #define ASM_OPEN_PAREN ""
        !          1456: #define ASM_CLOSE_PAREN ""
        !          1457: 
        !          1458: /* Define results of standard character escape sequences.  */
        !          1459: #define TARGET_BELL 007
        !          1460: #define TARGET_BS 010
        !          1461: #define TARGET_TAB 011
        !          1462: #define TARGET_NEWLINE 012
        !          1463: #define TARGET_VT 013
        !          1464: #define TARGET_FF 014
        !          1465: #define TARGET_CR 015
        !          1466: 
        !          1467: /* Print operand X (an rtx) in assembler syntax to file FILE.
        !          1468:    CODE is a letter or dot (`z' in `%z0') or 0 if no letter was specified.
        !          1469:    The CODE z takes the size of operand from the following digit, and
        !          1470:    outputs b,w,or l respectively.
        !          1471: 
        !          1472:    On the 80386, we use several such letters:
        !          1473:    f -- float insn (print a CONST_DOUBLE as a float rather than in hex).
        !          1474:    L,W,B,Q,S -- print the opcode suffix for specified size of operand.
        !          1475:    R -- print the prefix for register names.
        !          1476:    z -- print the opcode suffix for the size of the current operand.
        !          1477:    * -- print a star (in certain assembler syntax)
        !          1478:    w -- print the operand as if it's a "word" (HImode) even if it isn't.
        !          1479:    b -- print the operand as if it's a byte (QImode) even if it isn't.
        !          1480:    c -- don't print special prefixes before constant operands.  */
        !          1481: 
        !          1482: #define PRINT_OPERAND_PUNCT_VALID_P(CODE)                              \
        !          1483:   ((CODE) == '*')
        !          1484: 
        !          1485: /* Print the name of a register based on its machine mode and number.
        !          1486:    If CODE is 'w', pretend the mode is HImode.
        !          1487:    If CODE is 'b', pretend the mode is QImode.
        !          1488:    If CODE is 'k', pretend the mode is SImode.
        !          1489:    If CODE is 'h', pretend the reg is the `high' byte register.
        !          1490:    If CODE is 'y', print "st(0)" instead of "st", if the reg is stack op. */
        !          1491: 
        !          1492: extern char *hi_reg_name[];
        !          1493: extern char *qi_reg_name[];
        !          1494: extern char *qi_high_reg_name[];
        !          1495: 
        !          1496: #define PRINT_REG(X, CODE, FILE) \
        !          1497:   do { if (REGNO (X) == ARG_POINTER_REGNUM)            \
        !          1498:         abort ();                                      \
        !          1499:        fprintf (FILE, "%s", RP);                       \
        !          1500:        switch ((CODE == 'w' ? 2                        \
        !          1501:                : CODE == 'b' ? 1                       \
        !          1502:                : CODE == 'k' ? 4                       \
        !          1503:                : CODE == 'y' ? 3                       \
        !          1504:                : CODE == 'h' ? 0                       \
        !          1505:                : GET_MODE_SIZE (GET_MODE (X))))        \
        !          1506:         {                                              \
        !          1507:         case 3:                                        \
        !          1508:           if (STACK_TOP_P (X))                         \
        !          1509:             {                                          \
        !          1510:               fputs ("st(0)", FILE);                   \
        !          1511:               break;                                   \
        !          1512:             }                                          \
        !          1513:         case 4:                                        \
        !          1514:         case 8:                                        \
        !          1515:           if (! FP_REG_P (X)) fputs ("e", FILE);       \
        !          1516:         case 2:                                        \
        !          1517:           fputs (hi_reg_name[REGNO (X)], FILE);        \
        !          1518:           break;                                       \
        !          1519:         case 1:                                        \
        !          1520:           fputs (qi_reg_name[REGNO (X)], FILE);        \
        !          1521:           break;                                       \
        !          1522:         case 0:                                        \
        !          1523:           fputs (qi_high_reg_name[REGNO (X)], FILE);   \
        !          1524:           break;                                       \
        !          1525:         }                                              \
        !          1526:      } while (0)
        !          1527: 
        !          1528: #define PRINT_OPERAND(FILE, X, CODE)  \
        !          1529:   print_operand (FILE, X, CODE)
        !          1530: 
        !          1531: #define PRINT_OPERAND_ADDRESS(FILE, ADDR)  \
        !          1532:   print_operand_address (FILE, ADDR)
        !          1533: 
        !          1534: /* Print the name of a register for based on its machine mode and number.
        !          1535:    This macro is used to print debugging output.
        !          1536:    This macro is different from PRINT_REG in that it may be used in
        !          1537:    programs that are not linked with aux-output.o.  */
        !          1538: 
        !          1539: #define DEBUG_PRINT_REG(X, CODE, FILE) \
        !          1540:   do { static char *hi_name[] = HI_REGISTER_NAMES;     \
        !          1541:        static char *qi_name[] = QI_REGISTER_NAMES;     \
        !          1542:        fprintf (FILE, "%d %s", REGNO (X), RP); \
        !          1543:        if (REGNO (X) == ARG_POINTER_REGNUM)            \
        !          1544:         { fputs ("argp", FILE); break; }               \
        !          1545:        if (STACK_TOP_P (X))                            \
        !          1546:         { fputs ("st(0)", FILE); break; }              \
        !          1547:        switch (GET_MODE_SIZE (GET_MODE (X)))           \
        !          1548:         {                                              \
        !          1549:         case 8:                                        \
        !          1550:         case 4:                                        \
        !          1551:           if (! FP_REG_P (X)) fputs ("e", FILE);       \
        !          1552:         case 2:                                        \
        !          1553:           fputs (hi_name[REGNO (X)], FILE);            \
        !          1554:           break;                                       \
        !          1555:         case 1:                                        \
        !          1556:           fputs (qi_name[REGNO (X)], FILE);            \
        !          1557:           break;                                       \
        !          1558:         }                                              \
        !          1559:      } while (0)
        !          1560: 
        !          1561: /* Output the prefix for an immediate operand, or for an offset operand.  */
        !          1562: #define PRINT_IMMED_PREFIX(FILE)  fputs (IP, (FILE))
        !          1563: #define PRINT_OFFSET_PREFIX(FILE)  fputs (IP, (FILE))
        !          1564: 
        !          1565: /* Routines in libgcc that return floats must return them in an fp reg,
        !          1566:    just as other functions do which return such values.
        !          1567:    These macros make that happen.  */
        !          1568: 
        !          1569: #define FLOAT_VALUE_TYPE float
        !          1570: #define INTIFY(FLOATVAL) FLOATVAL
        !          1571: 
        !          1572: /* Nonzero if INSN magically clobbers register REGNO.  */
        !          1573: 
        !          1574: /* #define INSN_CLOBBERS_REGNO_P(INSN, REGNO)  \
        !          1575:     (FP_REGNO_P (REGNO)                                \
        !          1576:      && (GET_CODE (INSN) == JUMP_INSN || GET_CODE (INSN) == BARRIER))
        !          1577: */
        !          1578: 
        !          1579: /* a letter which is not needed by the normal asm syntax, which
        !          1580:    we can use for operand syntax in the extended asm */
        !          1581: 
        !          1582: #define ASM_OPERAND_LETTER '#'
        !          1583: 
        !          1584: #define RET return ""
        !          1585: #define AT_SP(mode) (gen_rtx (MEM, (mode), stack_pointer_rtx))
        !          1586: 
        !          1587: /*
        !          1588: Local variables:
        !          1589: version-control: t
        !          1590: End:
        !          1591: */

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