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Annotation of gcc/config/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:    independant 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: /* Run-time compilation parameters selecting different hardware subsets.  */
        !            41: 
        !            42: extern int target_flags;
        !            43: 
        !            44: /* Macros used in the machine description to test the flags.  */
        !            45: 
        !            46: /* Compile 80387 insns for floating point (not library calls).  */
        !            47: #define TARGET_80387 (target_flags & 1)
        !            48: /* Compile code for an i486. */
        !            49: #define TARGET_486 (target_flags & 2)
        !            50: /* Compile using ret insn that pops args.
        !            51:    This will not work unless you use prototypes at least
        !            52:    for all functions that can take varying numbers of args.  */  
        !            53: #define TARGET_RTD (target_flags & 8)
        !            54: /* Compile passing first two args in regs 0 and 1.
        !            55:    This exists only to test compiler features that will
        !            56:    be needed for RISC chips.  It is not usable
        !            57:    and is not intended to be usable on this cpu.  */
        !            58: #define TARGET_REGPARM (target_flags & 020)
        !            59: 
        !            60: /* Macro to define tables used to set the flags.
        !            61:    This is a list in braces of pairs in braces,
        !            62:    each pair being { "NAME", VALUE }
        !            63:    where VALUE is the bits to set or minus the bits to clear.
        !            64:    An empty string NAME is used to identify the default VALUE.  */
        !            65: 
        !            66: #define TARGET_SWITCHES  \
        !            67:   { { "80387", 1},                             \
        !            68:     { "soft-float", -1},                       \
        !            69:     { "486", 2},                               \
        !            70:     { "no486", -2},                            \
        !            71:     { "386", -2},                              \
        !            72:     { "rtd", 8},                               \
        !            73:     { "nortd", -8},                            \
        !            74:     { "regparm", 020},                         \
        !            75:     { "noregparm", -020},                      \
        !            76:     { "", TARGET_DEFAULT}}
        !            77: 
        !            78: /* target machine storage layout */
        !            79: 
        !            80: /* Define this if most significant byte of a word is the lowest numbered.  */
        !            81: /* That is true on the 80386.  */
        !            82: 
        !            83: #define BITS_BIG_ENDIAN 0
        !            84: 
        !            85: /* Define this if most significant byte of a word is the lowest numbered.  */
        !            86: /* That is not true on the 80386.  */
        !            87: #define BYTES_BIG_ENDIAN 0
        !            88: 
        !            89: /* Define this if most significant word of a multiword number is the lowest
        !            90:    numbered.  */
        !            91: /* Not true for 80386 */
        !            92: #define WORDS_BIG_ENDIAN 0
        !            93: 
        !            94: /* number of bits in an addressible storage unit */
        !            95: #define BITS_PER_UNIT 8
        !            96: 
        !            97: /* Width in bits of a "word", which is the contents of a machine register.
        !            98:    Note that this is not necessarily the width of data type `int';
        !            99:    if using 16-bit ints on a 80386, this would still be 32.
        !           100:    But on a machine with 16-bit registers, this would be 16.  */
        !           101: #define BITS_PER_WORD 32
        !           102: 
        !           103: /* Width of a word, in units (bytes).  */
        !           104: #define UNITS_PER_WORD 4
        !           105: 
        !           106: /* Width in bits of a pointer.
        !           107:    See also the macro `Pmode' defined below.  */
        !           108: #define POINTER_SIZE 32
        !           109: 
        !           110: /* Allocation boundary (in *bits*) for storing arguments in argument list.  */
        !           111: #define PARM_BOUNDARY 32
        !           112: 
        !           113: /* Boundary (in *bits*) on which stack pointer should be aligned.  */
        !           114: #define STACK_BOUNDARY 32
        !           115: 
        !           116: /* Allocation boundary (in *bits*) for the code of a function.
        !           117:    For i486, we get better performance by aligning to a cache
        !           118:    line (i.e. 16 byte) boundary.  */
        !           119: #define FUNCTION_BOUNDARY (TARGET_486 ? 128 : 32)
        !           120: 
        !           121: /* Alignment of field after `int : 0' in a structure. */
        !           122: 
        !           123: #define EMPTY_FIELD_BOUNDARY 32
        !           124: 
        !           125: /* Minimum size in bits of the largest boundary to which any
        !           126:    and all fundamental data types supported by the hardware
        !           127:    might need to be aligned. No data type wants to be aligned
        !           128:    rounder than this.  The i386 supports 64-bit floating point
        !           129:    quantities, but these can be aligned on any 32-bit boundary.  */
        !           130: #define BIGGEST_ALIGNMENT 32
        !           131: 
        !           132: /* Define this if move instructions will actually fail to work
        !           133:    when given unaligned data.  */
        !           134: /* #define STRICT_ALIGNMENT */
        !           135: 
        !           136: /* If bit field type is int, don't let it cross an int,
        !           137:    and give entire struct the alignment of an int.  */
        !           138: /* Required on the 386 since it doesn't have bitfield insns.  */
        !           139: #define PCC_BITFIELD_TYPE_MATTERS 1
        !           140: 
        !           141: /* Align loop starts for optimal branching.  */
        !           142: #define ASM_OUTPUT_LOOP_ALIGN(FILE) \
        !           143:   ASM_OUTPUT_ALIGN (FILE, 2)
        !           144: 
        !           145: /* This is how to align an instruction for optimal branching.
        !           146:    On i486 we'll get better performance by aligning on a
        !           147:    cache line (i.e. 16 byte) boundary.  */
        !           148: #define ASM_OUTPUT_ALIGN_CODE(FILE)    \
        !           149:   ASM_OUTPUT_ALIGN ((FILE), (TARGET_486 ? 4 : 2))
        !           150: 
        !           151: /* Standard register usage.  */
        !           152: 
        !           153: /* This processor has special stack-like registers.  See reg-stack.c
        !           154:    for details. */
        !           155: 
        !           156: #define STACK_REGS
        !           157: 
        !           158: /* Number of actual hardware registers.
        !           159:    The hardware registers are assigned numbers for the compiler
        !           160:    from 0 to just below FIRST_PSEUDO_REGISTER.
        !           161:    All registers that the compiler knows about must be given numbers,
        !           162:    even those that are not normally considered general registers.
        !           163: 
        !           164:    In the 80386 we give the 8 general purpose registers the numbers 0-7.
        !           165:    We number the floating point registers 8-15.
        !           166:    Note that registers 0-7 can be accessed as a  short or int,
        !           167:    while only 0-3 may be used with byte `mov' instructions.
        !           168: 
        !           169:    Reg 16 does not correspond to any hardware register, but instead
        !           170:    appears in the RTL as an argument pointer prior to reload, and is
        !           171:    eliminated during reloading in favor of either the stack or frame
        !           172:    pointer. */
        !           173: 
        !           174: #define FIRST_PSEUDO_REGISTER 17
        !           175: 
        !           176: /* 1 for registers that have pervasive standard uses
        !           177:    and are not available for the register allocator.
        !           178:    On the 80386, the stack pointer is such, as is the arg pointer. */
        !           179: #define FIXED_REGISTERS \
        !           180: /*ax,dx,cx,bx,si,di,bp,sp,st,st1,st2,st3,st4,st5,st6,st7,arg*/       \
        !           181: {  0, 0, 0, 0, 0, 0, 0, 1, 0,  0,  0,  0,  0,  0,  0,  0,  1 }
        !           182: 
        !           183: /* 1 for registers not available across function calls.
        !           184:    These must include the FIXED_REGISTERS and also any
        !           185:    registers that can be used without being saved.
        !           186:    The latter must include the registers where values are returned
        !           187:    and the register where structure-value addresses are passed.
        !           188:    Aside from that, you can include as many other registers as you like.  */
        !           189: 
        !           190: #define CALL_USED_REGISTERS \
        !           191: /*ax,dx,cx,bx,si,di,bp,sp,st,st1,st2,st3,st4,st5,st6,st7,arg*/ \
        !           192: {  1, 1, 1, 0, 0, 0, 0, 1, 1,  1,  1,  1,  1,  1,  1,  1,  1 }
        !           193: 
        !           194: /* Macro to conditionally modify fixed_regs/call_used_regs.  */
        !           195: #define CONDITIONAL_REGISTER_USAGE                     \
        !           196:   {                                                    \
        !           197:     if (flag_pic)                                      \
        !           198:       {                                                        \
        !           199:        fixed_regs[PIC_OFFSET_TABLE_REGNUM] = 1;        \
        !           200:        call_used_regs[PIC_OFFSET_TABLE_REGNUM] = 1;    \
        !           201:       }                                                        \
        !           202:   }
        !           203: 
        !           204: /* Return number of consecutive hard regs needed starting at reg REGNO
        !           205:    to hold something of mode MODE.
        !           206:    This is ordinarily the length in words of a value of mode MODE
        !           207:    but can be less for certain modes in special long registers.
        !           208: 
        !           209:    Actually there are no two word move instructions for consecutive 
        !           210:    registers.  And only registers 0-3 may have mov byte instructions
        !           211:    applied to them.
        !           212:    */
        !           213: 
        !           214: #define HARD_REGNO_NREGS(REGNO, MODE)   \
        !           215:   (FP_REGNO_P (REGNO) ? 1 \
        !           216:    : ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD))
        !           217: 
        !           218: /* Value is 1 if hard register REGNO can hold a value of machine-mode MODE.
        !           219:    On the 80386, the first 4 cpu registers can hold any mode
        !           220:    while the floating point registers may hold only floating point.
        !           221:    Make it clear that the fp regs could not hold a 16-byte float.  */
        !           222: 
        !           223: #define HARD_REGNO_MODE_OK(REGNO, MODE) \
        !           224:   ((REGNO) < 2 ? 1                                                     \
        !           225:    : (REGNO) < 4 ? 1                                                   \
        !           226:    : (REGNO) >= 8 ? ((GET_MODE_CLASS (MODE) == MODE_FLOAT              \
        !           227:                      || GET_MODE_CLASS (MODE) == MODE_COMPLEX_FLOAT)   \
        !           228:                     && GET_MODE_UNIT_SIZE (MODE) <= 8)                 \
        !           229:    : (MODE) != QImode)
        !           230: 
        !           231: /* Value is 1 if it is a good idea to tie two pseudo registers
        !           232:    when one has mode MODE1 and one has mode MODE2.
        !           233:    If HARD_REGNO_MODE_OK could produce different values for MODE1 and MODE2,
        !           234:    for any hard reg, then this must be 0 for correct output.  */
        !           235: 
        !           236: #define MODES_TIEABLE_P(MODE1, MODE2) ((MODE1) == (MODE2))
        !           237: 
        !           238: /* A C expression returning the cost of moving data from a register of class
        !           239:    CLASS1 to one of CLASS2.
        !           240: 
        !           241:    On the i386, copying between floating-point and fixed-point
        !           242:    registers is expensive.  */
        !           243: 
        !           244: #define REGISTER_MOVE_COST(CLASS1, CLASS2)             \
        !           245:   ((((CLASS1) == FLOAT_REGS && (CLASS2) != FLOAT_REGS) \
        !           246:     || ((CLASS2) == FLOAT_REGS && (CLASS1) != FLOAT_REGS))     \
        !           247:    ? 10 : 2)
        !           248: 
        !           249: /* Specify the registers used for certain standard purposes.
        !           250:    The values of these macros are register numbers.  */
        !           251: 
        !           252: /* on the 386 the pc register is %eip, and is not usable as a general
        !           253:    register.  The ordinary mov instructions won't work */
        !           254: /* #define PC_REGNUM  */
        !           255: 
        !           256: /* Register to use for pushing function arguments.  */
        !           257: #define STACK_POINTER_REGNUM 7
        !           258: 
        !           259: /* Base register for access to local variables of the function.  */
        !           260: #define FRAME_POINTER_REGNUM 6
        !           261: 
        !           262: /* First floating point reg */
        !           263: #define FIRST_FLOAT_REG 8
        !           264: 
        !           265: /* First & last stack-like regs */
        !           266: #define FIRST_STACK_REG FIRST_FLOAT_REG
        !           267: #define LAST_STACK_REG (FIRST_FLOAT_REG + 7)
        !           268: 
        !           269: /* Value should be nonzero if functions must have frame pointers.
        !           270:    Zero means the frame pointer need not be set up (and parms
        !           271:    may be accessed via the stack pointer) in functions that seem suitable.
        !           272:    This is computed in `reload', in reload1.c.  */
        !           273: #define FRAME_POINTER_REQUIRED 0
        !           274: 
        !           275: /* Base register for access to arguments of the function.  */
        !           276: #define ARG_POINTER_REGNUM 16
        !           277: 
        !           278: /* Register in which static-chain is passed to a function.  */
        !           279: #define STATIC_CHAIN_REGNUM 2
        !           280: 
        !           281: /* Register to hold the addressing base for position independent
        !           282:    code access to data items.  */
        !           283: #define PIC_OFFSET_TABLE_REGNUM 3
        !           284: 
        !           285: /* Register in which address to store a structure value
        !           286:    arrives in the function.  On the 386, the prologue
        !           287:    copies this from the stack to register %eax.  */
        !           288: #define STRUCT_VALUE_INCOMING 0
        !           289: 
        !           290: /* Place in which caller passes the structure value address.
        !           291:    0 means push the value on the stack like an argument.  */
        !           292: #define STRUCT_VALUE 0
        !           293: 
        !           294: /* Define the classes of registers for register constraints in the
        !           295:    machine description.  Also define ranges of constants.
        !           296: 
        !           297:    One of the classes must always be named ALL_REGS and include all hard regs.
        !           298:    If there is more than one class, another class must be named NO_REGS
        !           299:    and contain no registers.
        !           300: 
        !           301:    The name GENERAL_REGS must be the name of a class (or an alias for
        !           302:    another name such as ALL_REGS).  This is the class of registers
        !           303:    that is allowed by "g" or "r" in a register constraint.
        !           304:    Also, registers outside this class are allocated only when
        !           305:    instructions express preferences for them.
        !           306: 
        !           307:    The classes must be numbered in nondecreasing order; that is,
        !           308:    a larger-numbered class must never be contained completely
        !           309:    in a smaller-numbered class.
        !           310: 
        !           311:    For any two classes, it is very desirable that there be another
        !           312:    class that represents their union.  */
        !           313:    
        !           314: 
        !           315: enum reg_class
        !           316: {
        !           317:   NO_REGS,
        !           318:   AREG, DREG, CREG,
        !           319:   Q_REGS,                      /* %eax %ebx %ecx %edx */
        !           320:   SIREG, DIREG,
        !           321:   INDEX_REGS,                  /* %eax %ebx %ecx %edx %esi %edi %ebp */
        !           322:   GENERAL_REGS,                        /* %eax %ebx %ecx %edx %esi %edi %ebp %esp */
        !           323:   FP_TOP_REG, FP_SECOND_REG,   /* %st(0) %st(1) */
        !           324:   FLOAT_REGS,
        !           325:   ALL_REGS, LIM_REG_CLASSES
        !           326: };
        !           327: 
        !           328: #define N_REG_CLASSES (int) LIM_REG_CLASSES
        !           329: 
        !           330: /* Give names of register classes as strings for dump file.   */
        !           331: 
        !           332: #define REG_CLASS_NAMES \
        !           333: {  "NO_REGS",                          \
        !           334:    "AREG", "DREG", "CREG",             \
        !           335:    "Q_REGS",                           \
        !           336:    "SIREG", "DIREG",                   \
        !           337:    "INDEX_REGS",                       \
        !           338:    "GENERAL_REGS",                     \
        !           339:    "FP_TOP_REG", "FP_SECOND_REG",      \
        !           340:    "FLOAT_REGS",                       \
        !           341:    "ALL_REGS" }
        !           342: 
        !           343: /* Define which registers fit in which classes.
        !           344:    This is an initializer for a vector of HARD_REG_SET
        !           345:    of length N_REG_CLASSES.  */
        !           346: 
        !           347: #define REG_CLASS_CONTENTS \
        !           348: {      0,                                                      \
        !           349:      0x1,    0x2,  0x4,                /* AREG, DREG, CREG */          \
        !           350:      0xf,                      /* Q_REGS */                    \
        !           351:     0x10,   0x20,              /* SIREG, DIREG */              \
        !           352:  0x1007f,                      /* INDEX_REGS */                \
        !           353:  0x100ff,                      /* GENERAL_REGS */              \
        !           354:   0x0100, 0x0200,              /* FP_TOP_REG, FP_SECOND_REG */ \
        !           355:   0xff00,                      /* FLOAT_REGS */                \
        !           356:  0x1ffff }
        !           357: 
        !           358: /* The same information, inverted:
        !           359:    Return the class number of the smallest class containing
        !           360:    reg number REGNO.  This could be a conditional expression
        !           361:    or could index an array.  */
        !           362: 
        !           363: extern enum reg_class regclass_map[FIRST_PSEUDO_REGISTER];
        !           364: #define REGNO_REG_CLASS(REGNO) (regclass_map[REGNO])
        !           365: 
        !           366: /* When defined, the compiler allows registers explicitly used in the
        !           367:    rtl to be used as spill registers but prevents the compiler from
        !           368:    extending the lifetime of these registers. */
        !           369: 
        !           370: #define SMALL_REGISTER_CLASSES
        !           371: 
        !           372: #define QI_REG_P(X) \
        !           373:   (REG_P (X) && REGNO (X) < 4)
        !           374: #define NON_QI_REG_P(X) \
        !           375:   (REG_P (X) && REGNO (X) >= 4 && REGNO (X) < FIRST_PSEUDO_REGISTER)
        !           376: 
        !           377: #define FP_REG_P(X) (REG_P (X) && FP_REGNO_P (REGNO (X)))
        !           378: #define FP_REGNO_P(n) ((n) >= FIRST_STACK_REG && (n) <= LAST_STACK_REG)
        !           379:   
        !           380: #define STACK_REG_P(xop) (REG_P (xop) &&                       \
        !           381:                          REGNO (xop) >= FIRST_STACK_REG &&     \
        !           382:                          REGNO (xop) <= LAST_STACK_REG)
        !           383: 
        !           384: #define NON_STACK_REG_P(xop) (REG_P (xop) && ! STACK_REG_P (xop))
        !           385: 
        !           386: #define STACK_TOP_P(xop) (REG_P (xop) && REGNO (xop) == FIRST_STACK_REG)
        !           387: 
        !           388: /* Try to maintain the accuracy of the death notes for regs satisfying the
        !           389:    following.  Important for stack like regs, to know when to pop. */
        !           390: 
        !           391: /* #define PRESERVE_DEATH_INFO_REGNO_P(x) FP_REGNO_P(x) */
        !           392: 
        !           393: /* 1 if register REGNO can magically overlap other regs.
        !           394:    Note that nonzero values work only in very special circumstances. */
        !           395: 
        !           396: /* #define OVERLAPPING_REGNO_P(REGNO) FP_REGNO_P (REGNO) */
        !           397: 
        !           398: /* The class value for index registers, and the one for base regs.  */
        !           399: 
        !           400: #define INDEX_REG_CLASS INDEX_REGS
        !           401: #define BASE_REG_CLASS GENERAL_REGS
        !           402: 
        !           403: /* Get reg_class from a letter such as appears in the machine description.  */
        !           404: 
        !           405: #define REG_CLASS_FROM_LETTER(C)       \
        !           406:   ((C) == 'r' ? GENERAL_REGS :         \
        !           407:    (C) == 'q' ? Q_REGS :               \
        !           408:    (C) == 'f' ? FLOAT_REGS :           \
        !           409:    (C) == 't' ? FP_TOP_REG :           \
        !           410:    (C) == 'u' ? FP_SECOND_REG :                \
        !           411:    (C) == 'a' ? AREG :                 \
        !           412:    (C) == 'c' ? CREG :                 \
        !           413:    (C) == 'd' ? DREG :                 \
        !           414:    (C) == 'D' ? DIREG :                        \
        !           415:    (C) == 'S' ? SIREG : NO_REGS)
        !           416: 
        !           417: /* The letters I, J, K, L and M in a register constraint string
        !           418:    can be used to stand for particular ranges of immediate operands.
        !           419:    This macro defines what the ranges are.
        !           420:    C is the letter, and VALUE is a constant value.
        !           421:    Return 1 if VALUE is in the range specified by C.
        !           422: 
        !           423:    I is for non-DImode shifts.
        !           424:    J is for DImode shifts.
        !           425:    K and L are for an `andsi' optimization.
        !           426:    M is for shifts that can be executed by the "lea" opcode.
        !           427:    */
        !           428: 
        !           429: #define CONST_OK_FOR_LETTER_P(VALUE, C)  \
        !           430:   ((C) == 'I' ? (VALUE) >= 0 && (VALUE) <= 31 :        \
        !           431:    (C) == 'J' ? (VALUE) >= 0 && (VALUE) <= 63 :        \
        !           432:    (C) == 'K' ? (VALUE) == 0xff :              \
        !           433:    (C) == 'L' ? (VALUE) == 0xffff :            \
        !           434:    (C) == 'M' ? (VALUE) >= 0 && (VALUE) <= 3 : \
        !           435:    0)
        !           436: 
        !           437: /* Similar, but for floating constants, and defining letters G and H.
        !           438:    Here VALUE is the CONST_DOUBLE rtx itself.  */
        !           439: 
        !           440: #define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C)  \
        !           441:   ((C) == 'G' ? (TARGET_80387 && standard_80387_constant_p (VALUE)) : 0)
        !           442: 
        !           443: /* Place additional restrictions on the register class to use when it
        !           444:    is necessary to be able to hold a value of mode @var{mode} in a reload
        !           445:    register for which class @var{class} would ordinarily be used. */
        !           446: 
        !           447: #define LIMIT_RELOAD_CLASS(MODE, CLASS) \
        !           448:   ((MODE) == QImode && ((CLASS) == ALL_REGS || (CLASS) == GENERAL_REGS) \
        !           449:    ? Q_REGS : (CLASS))
        !           450: 
        !           451: /* Given an rtx X being reloaded into a reg required to be
        !           452:    in class CLASS, return the class of reg to actually use.
        !           453:    In general this is just CLASS; but on some machines
        !           454:    in some cases it is preferable to use a more restrictive class.
        !           455:    On the 80386 series, we prevent floating constants from being
        !           456:    reloaded into floating registers (since no move-insn can do that)
        !           457:    and we ensure that QImodes aren't reloaded into the esi or edi reg.  */
        !           458: 
        !           459: /* Don't put CONST_DOUBLE into FLOAT_REGS.
        !           460:    QImode must go into class Q_REGS.
        !           461:    MODE_INT must not go into FLOAT_REGS. */
        !           462: 
        !           463: #define PREFERRED_RELOAD_CLASS(X,CLASS)                        \
        !           464:   (GET_CODE (X) == CONST_DOUBLE                                \
        !           465:    ? (reg_class_subset_p ((CLASS), GENERAL_REGS) || (CLASS) == ALL_REGS \
        !           466:       ? (CLASS) : NO_REGS)                             \
        !           467:    : GET_MODE (X) == QImode                            \
        !           468:    ? (! reg_class_subset_p ((CLASS), Q_REGS) ? Q_REGS : (CLASS))       \
        !           469:    : (GET_MODE_CLASS (GET_MODE (X)) == MODE_INT && (CLASS) == FLOAT_REGS ? \
        !           470:       GENERAL_REGS : (CLASS)))
        !           471: 
        !           472: /* Return the maximum number of consecutive registers
        !           473:    needed to represent mode MODE in a register of class CLASS.  */
        !           474: /* On the 80386, this is the size of MODE in words,
        !           475:    except in the FP regs, where a single reg is always enough.  */
        !           476: #define CLASS_MAX_NREGS(CLASS, MODE)   \
        !           477:  ((CLASS) == FLOAT_REGS ? 1 :          \
        !           478:   (CLASS) == FP_TOP_REG ? 1 :          \
        !           479:   (CLASS) == FP_SECOND_REG ? 1 :       \
        !           480:    ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD))
        !           481: 
        !           482: /* Stack layout; function entry, exit and calling.  */
        !           483: 
        !           484: /* Define this if pushing a word on the stack
        !           485:    makes the stack pointer a smaller address.  */
        !           486: #define STACK_GROWS_DOWNWARD
        !           487: 
        !           488: /* Define this if the nominal address of the stack frame
        !           489:    is at the high-address end of the local variables;
        !           490:    that is, each additional local variable allocated
        !           491:    goes at a more negative offset in the frame.  */
        !           492: #define FRAME_GROWS_DOWNWARD
        !           493: 
        !           494: /* Offset within stack frame to start allocating local variables at.
        !           495:    If FRAME_GROWS_DOWNWARD, this is the offset to the END of the
        !           496:    first local allocated.  Otherwise, it is the offset to the BEGINNING
        !           497:    of the first local allocated.  */
        !           498: #define STARTING_FRAME_OFFSET 0
        !           499: 
        !           500: /* If we generate an insn to push BYTES bytes,
        !           501:    this says how many the stack pointer really advances by.
        !           502:    On 386 pushw decrements by exactly 2 no matter what the position was.
        !           503:    On the 386 there is no pushb; we use pushw instead, and this
        !           504:    has the effect of rounding up to 2.  */
        !           505: 
        !           506: #define PUSH_ROUNDING(BYTES) (((BYTES) + 1) & (-2))
        !           507: 
        !           508: /* Offset of first parameter from the argument pointer register value.  */
        !           509: #define FIRST_PARM_OFFSET(FNDECL) 0
        !           510: 
        !           511: /* Value is the number of bytes of arguments automatically
        !           512:    popped when returning from a subroutine call.
        !           513:    FUNTYPE is the data type of the function (as a tree),
        !           514:    or for a library call it is an identifier node for the subroutine name.
        !           515:    SIZE is the number of bytes of arguments passed on the stack.
        !           516: 
        !           517:    On the 80386, the RTD insn may be used to pop them if the number
        !           518:      of args is fixed, but if the number is variable then the caller
        !           519:      must pop them all.  RTD can't be used for library calls now
        !           520:      because the library is compiled with the Unix compiler.
        !           521:    Use of RTD is a selectable option, since it is incompatible with
        !           522:    standard Unix calling sequences.  If the option is not selected,
        !           523:    the caller must always pop the args.  */
        !           524: 
        !           525: #define RETURN_POPS_ARGS(FUNTYPE,SIZE)   \
        !           526:   (TREE_CODE (FUNTYPE) == IDENTIFIER_NODE ? 0                  \
        !           527:    : (TARGET_RTD                                               \
        !           528:       && (TYPE_ARG_TYPES (FUNTYPE) == 0                                \
        !           529:          || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (FUNTYPE))) \
        !           530:              == void_type_node))) ? (SIZE)                     \
        !           531:    : (aggregate_value_p (FUNTYPE)) ? GET_MODE_SIZE (Pmode) : 0)
        !           532: 
        !           533: #define FUNCTION_VALUE(VALTYPE, FUNC)  \
        !           534:    gen_rtx (REG, TYPE_MODE (VALTYPE), \
        !           535:            VALUE_REGNO (TYPE_MODE (VALTYPE)))
        !           536: 
        !           537: /* Define how to find the value returned by a library function
        !           538:    assuming the value has mode MODE.  */
        !           539: 
        !           540: #define LIBCALL_VALUE(MODE) \
        !           541:   gen_rtx (REG, MODE, VALUE_REGNO (MODE))
        !           542: 
        !           543: /* 1 if N is a possible register number for function argument passing.
        !           544:    On the 80386, no registers are used in this way.
        !           545:       *NOTE* -mregparm does not work.
        !           546:    It exists only to test register calling conventions.  */
        !           547: 
        !           548: #define FUNCTION_ARG_REGNO_P(N) 0
        !           549: 
        !           550: /* Define a data type for recording info about an argument list
        !           551:    during the scan of that argument list.  This data type should
        !           552:    hold all necessary information about the function itself
        !           553:    and about the args processed so far, enough to enable macros
        !           554:    such as FUNCTION_ARG to determine where the next arg should go.
        !           555: 
        !           556:    On the 80386, this is a single integer, which is a number of bytes
        !           557:    of arguments scanned so far.  */
        !           558: 
        !           559: #define CUMULATIVE_ARGS int
        !           560: 
        !           561: /* Initialize a variable CUM of type CUMULATIVE_ARGS
        !           562:    for a call to a function whose data type is FNTYPE.
        !           563:    For a library call, FNTYPE is 0.
        !           564: 
        !           565:    On the 80386, the offset starts at 0.  */
        !           566: 
        !           567: #define INIT_CUMULATIVE_ARGS(CUM,FNTYPE,LIBNAME)       \
        !           568:  ((CUM) = 0)
        !           569: 
        !           570: /* Update the data in CUM to advance over an argument
        !           571:    of mode MODE and data type TYPE.
        !           572:    (TYPE is null for libcalls where that information may not be available.)  */
        !           573: 
        !           574: #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED)   \
        !           575:  ((CUM) += ((MODE) != BLKmode                  \
        !           576:            ? (GET_MODE_SIZE (MODE) + 3) & ~3   \
        !           577:            : (int_size_in_bytes (TYPE) + 3) & ~3))
        !           578: 
        !           579: /* Define where to put the arguments to a function.
        !           580:    Value is zero to push the argument on the stack,
        !           581:    or a hard register in which to store the argument.
        !           582: 
        !           583:    MODE is the argument's machine mode.
        !           584:    TYPE is the data type of the argument (as a tree).
        !           585:     This is null for libcalls where that information may
        !           586:     not be available.
        !           587:    CUM is a variable of type CUMULATIVE_ARGS which gives info about
        !           588:     the preceding args and about the function being called.
        !           589:    NAMED is nonzero if this argument is a named parameter
        !           590:     (otherwise it is an extra parameter matching an ellipsis).  */
        !           591: 
        !           592: 
        !           593: /* On the 80386 all args are pushed, except if -mregparm is specified
        !           594:    then the first two words of arguments are passed in EAX, EDX.
        !           595:    *NOTE* -mregparm does not work.
        !           596:    It exists only to test register calling conventions.  */
        !           597: 
        !           598: #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) \
        !           599: ((TARGET_REGPARM && (CUM) < 8) ? gen_rtx (REG, (MODE), (CUM) / 4) : 0)
        !           600: 
        !           601: /* For an arg passed partly in registers and partly in memory,
        !           602:    this is the number of registers used.
        !           603:    For args passed entirely in registers or entirely in memory, zero.  */
        !           604: 
        !           605: 
        !           606: #define FUNCTION_ARG_PARTIAL_NREGS(CUM, MODE, TYPE, NAMED) \
        !           607: ((TARGET_REGPARM && (CUM) < 8                                  \
        !           608:   && 8 < ((CUM) + ((MODE) == BLKmode                           \
        !           609:                      ? int_size_in_bytes (TYPE)                \
        !           610:                      : GET_MODE_SIZE (MODE))))                 \
        !           611:  ? 2 - (CUM) / 4 : 0)
        !           612: 
        !           613: /* This macro generates the assembly code for function entry.
        !           614:    FILE is a stdio stream to output the code to.
        !           615:    SIZE is an int: how many units of temporary storage to allocate.
        !           616:    Refer to the array `regs_ever_live' to determine which registers
        !           617:    to save; `regs_ever_live[I]' is nonzero if register number I
        !           618:    is ever used in the function.  This macro is responsible for
        !           619:    knowing which registers should not be saved even if used.  */
        !           620: 
        !           621: #define FUNCTION_PROLOGUE(FILE, SIZE)     \
        !           622:   function_prologue (FILE, SIZE)
        !           623: 
        !           624: /* Output assembler code to FILE to increment profiler label # LABELNO
        !           625:    for profiling a function entry.  */
        !           626: 
        !           627: #define FUNCTION_PROFILER(FILE, LABELNO)  \
        !           628: {                                                                      \
        !           629:   if (flag_pic)                                                                \
        !           630:     {                                                                  \
        !           631:       fprintf (FILE, "\tleal %sP%d@GOTOFF(%%ebx),%%edx\n",             \
        !           632:               LPREFIX, (LABELNO));                                     \
        !           633:       fprintf (FILE, "\tcall *_mcount@GOT(%%ebx)\n");                  \
        !           634:     }                                                                  \
        !           635:   else                                                                 \
        !           636:     {                                                                  \
        !           637:       fprintf (FILE, "\tmovl $%sP%d,%%edx\n", LPREFIX, (LABELNO));     \
        !           638:       fprintf (FILE, "\tcall _mcount\n");                              \
        !           639:     }                                                                  \
        !           640: }
        !           641: 
        !           642: /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
        !           643:    the stack pointer does not matter.  The value is tested only in
        !           644:    functions that have frame pointers.
        !           645:    No definition is equivalent to always zero.  */
        !           646: /* Note on the 386 it might be more efficient not to define this since 
        !           647:    we have to restore it ourselves from the frame pointer, in order to
        !           648:    use pop */
        !           649: 
        !           650: #define EXIT_IGNORE_STACK 1
        !           651: 
        !           652: /* This macro generates the assembly code for function exit,
        !           653:    on machines that need it.  If FUNCTION_EPILOGUE is not defined
        !           654:    then individual return instructions are generated for each
        !           655:    return statement.  Args are same as for FUNCTION_PROLOGUE.
        !           656: 
        !           657:    The function epilogue should not depend on the current stack pointer!
        !           658:    It should use the frame pointer only.  This is mandatory because
        !           659:    of alloca; we also take advantage of it to omit stack adjustments
        !           660:    before returning.
        !           661: 
        !           662:    If the last non-note insn in the function is a BARRIER, then there
        !           663:    is no need to emit a function prologue, because control does not fall
        !           664:    off the end.  This happens if the function ends in an "exit" call, or
        !           665:    if a `return' insn is emitted directly into the function. */
        !           666: 
        !           667: #define FUNCTION_EPILOGUE(FILE, SIZE)          \
        !           668: do {                                           \
        !           669:   rtx last = get_last_insn ();                 \
        !           670:   if (last && GET_CODE (last) == NOTE)         \
        !           671:     last = prev_nonnote_insn (last);           \
        !           672:   if (! last || GET_CODE (last) != BARRIER)    \
        !           673:     function_epilogue (FILE, SIZE);            \
        !           674: } while (0)
        !           675: 
        !           676: /* Output assembler code for a block containing the constant parts
        !           677:    of a trampoline, leaving space for the variable parts.  */
        !           678: 
        !           679: /* On the 386, the trampoline contains three instructions:
        !           680:      mov #STATIC,ecx
        !           681:      mov #FUNCTION,eax
        !           682:      jmp @eax  */
        !           683: #define TRAMPOLINE_TEMPLATE(FILE)                                      \
        !           684: {                                                                      \
        !           685:   ASM_OUTPUT_CHAR (FILE, gen_rtx (CONST_INT, VOIDmode, 0xb9));         \
        !           686:   ASM_OUTPUT_SHORT (FILE, const0_rtx);                                 \
        !           687:   ASM_OUTPUT_SHORT (FILE, const0_rtx);                                 \
        !           688:   ASM_OUTPUT_CHAR (FILE, gen_rtx (CONST_INT, VOIDmode, 0xb8));         \
        !           689:   ASM_OUTPUT_SHORT (FILE, const0_rtx);                                 \
        !           690:   ASM_OUTPUT_SHORT (FILE, const0_rtx);                                 \
        !           691:   ASM_OUTPUT_CHAR (FILE, gen_rtx (CONST_INT, VOIDmode, 0xff));         \
        !           692:   ASM_OUTPUT_CHAR (FILE, gen_rtx (CONST_INT, VOIDmode, 0xe0));         \
        !           693: }
        !           694: 
        !           695: /* Length in units of the trampoline for entering a nested function.  */
        !           696: 
        !           697: #define TRAMPOLINE_SIZE 12
        !           698: 
        !           699: /* Emit RTL insns to initialize the variable parts of a trampoline.
        !           700:    FNADDR is an RTX for the address of the function's pure code.
        !           701:    CXT is an RTX for the static chain value for the function.  */
        !           702: 
        !           703: #define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT)                      \
        !           704: {                                                                      \
        !           705:   emit_move_insn (gen_rtx (MEM, SImode, plus_constant (TRAMP, 1)), CXT); \
        !           706:   emit_move_insn (gen_rtx (MEM, SImode, plus_constant (TRAMP, 6)), FNADDR); \
        !           707: }
        !           708: 
        !           709: /* Definitions for register eliminations.
        !           710: 
        !           711:    This is an array of structures.  Each structure initializes one pair
        !           712:    of eliminable registers.  The "from" register number is given first,
        !           713:    followed by "to".  Eliminations of the same "from" register are listed
        !           714:    in order of preference.
        !           715: 
        !           716:    We have two registers that can be eliminated on the i386.  First, the
        !           717:    frame pointer register can often be eliminated in favor of the stack
        !           718:    pointer register.  Secondly, the argument pointer register can always be
        !           719:    eliminated; it is replaced with either the stack or frame pointer. */
        !           720: 
        !           721: #define ELIMINABLE_REGS                                \
        !           722: {{ ARG_POINTER_REGNUM, STACK_POINTER_REGNUM},  \
        !           723:  { ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM},   \
        !           724:  { FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}
        !           725: 
        !           726: /* Given FROM and TO register numbers, say whether this elimination is allowed.
        !           727:    Frame pointer elimination is automatically handled.
        !           728: 
        !           729:    For the i386, if frame pointer elimination is being done, we would like to
        !           730:    convert ap into sp, not fp.
        !           731: 
        !           732:    All other eliminations are valid.  */
        !           733: 
        !           734: #define CAN_ELIMINATE(FROM, TO)                                        \
        !           735:  ((FROM) == ARG_POINTER_REGNUM && (TO) == STACK_POINTER_REGNUM \
        !           736:   ? ! frame_pointer_needed                                     \
        !           737:   : 1)
        !           738: 
        !           739: /* Define the offset between two registers, one to be eliminated, and the other
        !           740:    its replacement, at the start of a routine.  */
        !           741: 
        !           742: #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET)                   \
        !           743: {                                                                      \
        !           744:   if ((FROM) == ARG_POINTER_REGNUM && (TO) == FRAME_POINTER_REGNUM)    \
        !           745:     (OFFSET) = 8;      /* Skip saved PC and previous frame pointer */  \
        !           746:   else                                                                 \
        !           747:     {                                                                  \
        !           748:       int regno;                                                       \
        !           749:       int offset = 0;                                                  \
        !           750:                                                                        \
        !           751:       for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)          \
        !           752:        if ((regs_ever_live[regno] && ! call_used_regs[regno])          \
        !           753:            || (current_function_uses_pic_offset_table                  \
        !           754:                && regno == PIC_OFFSET_TABLE_REGNUM))                   \
        !           755:          offset += 4;                                                  \
        !           756:                                                                        \
        !           757:       (OFFSET) = offset + get_frame_size ();                           \
        !           758:                                                                        \
        !           759:       if ((FROM) == ARG_POINTER_REGNUM && (TO) == STACK_POINTER_REGNUM)        \
        !           760:        (OFFSET) += 4;  /* Skip saved PC */                             \
        !           761:     }                                                                  \
        !           762: }
        !           763: 
        !           764: /* Addressing modes, and classification of registers for them.  */
        !           765: 
        !           766: /* #define HAVE_POST_INCREMENT */
        !           767: /* #define HAVE_POST_DECREMENT */
        !           768: 
        !           769: /* #define HAVE_PRE_DECREMENT */
        !           770: /* #define HAVE_PRE_INCREMENT */
        !           771: 
        !           772: /* Macros to check register numbers against specific register classes.  */
        !           773: 
        !           774: /* These assume that REGNO is a hard or pseudo reg number.
        !           775:    They give nonzero only if REGNO is a hard reg of the suitable class
        !           776:    or a pseudo reg currently allocated to a suitable hard reg.
        !           777:    Since they use reg_renumber, they are safe only once reg_renumber
        !           778:    has been allocated, which happens in local-alloc.c.  */
        !           779: 
        !           780: #define REGNO_OK_FOR_INDEX_P(REGNO) \
        !           781:   ((REGNO) < STACK_POINTER_REGNUM \
        !           782:    || (unsigned) reg_renumber[REGNO] < STACK_POINTER_REGNUM)
        !           783: 
        !           784: #define REGNO_OK_FOR_BASE_P(REGNO) \
        !           785:   ((REGNO) <= STACK_POINTER_REGNUM \
        !           786:    || (REGNO) == ARG_POINTER_REGNUM \
        !           787:    || (unsigned) reg_renumber[REGNO] <= STACK_POINTER_REGNUM)
        !           788: 
        !           789: #define REGNO_OK_FOR_SIREG_P(REGNO) ((REGNO) == 4 || reg_renumber[REGNO] == 4)
        !           790: #define REGNO_OK_FOR_DIREG_P(REGNO) ((REGNO) == 5 || reg_renumber[REGNO] == 5)
        !           791: 
        !           792: /* The macros REG_OK_FOR..._P assume that the arg is a REG rtx
        !           793:    and check its validity for a certain class.
        !           794:    We have two alternate definitions for each of them.
        !           795:    The usual definition accepts all pseudo regs; the other rejects
        !           796:    them unless they have been allocated suitable hard regs.
        !           797:    The symbol REG_OK_STRICT causes the latter definition to be used.
        !           798: 
        !           799:    Most source files want to accept pseudo regs in the hope that
        !           800:    they will get allocated to the class that the insn wants them to be in.
        !           801:    Source files for reload pass need to be strict.
        !           802:    After reload, it makes no difference, since pseudo regs have
        !           803:    been eliminated by then.  */
        !           804: 
        !           805: #ifndef REG_OK_STRICT
        !           806: 
        !           807: /* Nonzero if X is a hard reg that can be used as an index or if
        !           808:    it is a pseudo reg.  */
        !           809: 
        !           810: #define REG_OK_FOR_INDEX_P(X) \
        !           811:   (REGNO (X) < STACK_POINTER_REGNUM \
        !           812:    || REGNO (X) >= FIRST_PSEUDO_REGISTER)
        !           813: 
        !           814: /* Nonzero if X is a hard reg that can be used as a base reg
        !           815:    of if it is a pseudo reg.  */
        !           816:   /* ?wfs */
        !           817: 
        !           818: #define REG_OK_FOR_BASE_P(X) \
        !           819:   (REGNO (X) <= STACK_POINTER_REGNUM \
        !           820:    || REGNO (X) == ARG_POINTER_REGNUM \
        !           821:    || REGNO(X) >= FIRST_PSEUDO_REGISTER)
        !           822: 
        !           823: #define REG_OK_FOR_STRREG_P(X) \
        !           824:   (REGNO (X) == 4 || REGNO (X) == 5 || REGNO (X) >= FIRST_PSEUDO_REGISTER)
        !           825: 
        !           826: #else
        !           827: 
        !           828: /* Nonzero if X is a hard reg that can be used as an index.  */
        !           829: #define REG_OK_FOR_INDEX_P(X) REGNO_OK_FOR_INDEX_P (REGNO (X))
        !           830: /* Nonzero if X is a hard reg that can be used as a base reg.  */
        !           831: #define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
        !           832: #define REG_OK_FOR_STRREG_P(X) \
        !           833:   (REGNO_OK_FOR_DIREG_P (REGNO (X)) || REGNO_OK_FOR_SIREG_P (REGNO (X)))
        !           834: 
        !           835: #endif
        !           836: 
        !           837: /* GO_IF_LEGITIMATE_ADDRESS recognizes an RTL expression
        !           838:    that is a valid memory address for an instruction.
        !           839:    The MODE argument is the machine mode for the MEM expression
        !           840:    that wants to use this address.
        !           841: 
        !           842:    The other macros defined here are used only in GO_IF_LEGITIMATE_ADDRESS,
        !           843:    except for CONSTANT_ADDRESS_P which is usually machine-independent.
        !           844: 
        !           845:    See legitimize_pic_address in i386.c for details as to what
        !           846:    constitutes a legitimate address when -fpic is used.  */
        !           847: 
        !           848: #define MAX_REGS_PER_ADDRESS 2
        !           849: 
        !           850: #define CONSTANT_ADDRESS_P(X)   CONSTANT_P (X)
        !           851: 
        !           852: /* Nonzero if the constant value X is a legitimate general operand.
        !           853:    It is given that X satisfies CONSTANT_P or is a CONST_DOUBLE.  */
        !           854: 
        !           855: #define LEGITIMATE_CONSTANT_P(X) 1
        !           856: 
        !           857: #define GO_IF_INDEXABLE_BASE(X, ADDR)  \
        !           858:  if (GET_CODE (X) == REG && REG_OK_FOR_BASE_P (X)) goto ADDR
        !           859: 
        !           860: #define LEGITIMATE_INDEX_REG_P(X)   \
        !           861:   (GET_CODE (X) == REG && REG_OK_FOR_INDEX_P (X))
        !           862: 
        !           863: /* Return 1 if X is an index or an index times a scale.  */
        !           864: 
        !           865: #define LEGITIMATE_INDEX_P(X)   \
        !           866:    (LEGITIMATE_INDEX_REG_P (X)                         \
        !           867:     || (GET_CODE (X) == MULT                           \
        !           868:        && LEGITIMATE_INDEX_REG_P (XEXP (X, 0))         \
        !           869:        && GET_CODE (XEXP (X, 1)) == CONST_INT          \
        !           870:        && (INTVAL (XEXP (X, 1)) == 2                   \
        !           871:            || INTVAL (XEXP (X, 1)) == 4                \
        !           872:            || INTVAL (XEXP (X, 1)) == 8)))
        !           873: 
        !           874: /* Go to ADDR if X is an index term, a base reg, or a sum of those.  */
        !           875: 
        !           876: #define GO_IF_INDEXING(X, ADDR)        \
        !           877: { if (LEGITIMATE_INDEX_P (X)) goto ADDR;                               \
        !           878:   GO_IF_INDEXABLE_BASE (X, ADDR);                                      \
        !           879:   if (GET_CODE (X) == PLUS && LEGITIMATE_INDEX_P (XEXP (X, 0)))                \
        !           880:     { GO_IF_INDEXABLE_BASE (XEXP (X, 1), ADDR); }                      \
        !           881:   if (GET_CODE (X) == PLUS && LEGITIMATE_INDEX_P (XEXP (X, 1)))                \
        !           882:     { GO_IF_INDEXABLE_BASE (XEXP (X, 0), ADDR); } }
        !           883: 
        !           884: /* We used to allow this, but it isn't ever used.
        !           885:    || ((GET_CODE (X) == POST_DEC || GET_CODE (X) == POST_INC)          \
        !           886:        && REG_P (XEXP (X, 0))                                          \
        !           887:        && REG_OK_FOR_STRREG_P (XEXP (X, 0)))                           \
        !           888: */
        !           889: 
        !           890: #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, ADDR)        \
        !           891: {                                                                      \
        !           892:   if (CONSTANT_ADDRESS_P (X)                                           \
        !           893:       && (! flag_pic || LEGITIMATE_PIC_OPERAND_P (X)))                 \
        !           894:     goto ADDR;                                                         \
        !           895:   GO_IF_INDEXING (X, ADDR);                                            \
        !           896:   if (GET_CODE (X) == PLUS && CONSTANT_ADDRESS_P (XEXP (X, 1)))                \
        !           897:     {                                                                  \
        !           898:       rtx x0 = XEXP (X, 0);                                            \
        !           899:       if (! flag_pic || ! SYMBOLIC_CONST (XEXP (X, 1)))                        \
        !           900:        { GO_IF_INDEXING (x0, ADDR); }                                  \
        !           901:       else if (x0 == pic_offset_table_rtx)                             \
        !           902:        goto ADDR;                                                      \
        !           903:       else if (GET_CODE (x0) == PLUS)                                  \
        !           904:        {                                                               \
        !           905:          if (XEXP (x0, 0) == pic_offset_table_rtx)                     \
        !           906:            { GO_IF_INDEXABLE_BASE (XEXP (x0, 1), ADDR); }              \
        !           907:          if (XEXP (x0, 1) == pic_offset_table_rtx)                     \
        !           908:            { GO_IF_INDEXABLE_BASE (XEXP (x0, 0), ADDR); }              \
        !           909:        }                                                               \
        !           910:     }                                                                  \
        !           911: }
        !           912: 
        !           913: /* Try machine-dependent ways of modifying an illegitimate address
        !           914:    to be legitimate.  If we find one, return the new, valid address.
        !           915:    This macro is used in only one place: `memory_address' in explow.c.
        !           916: 
        !           917:    OLDX is the address as it was before break_out_memory_refs was called.
        !           918:    In some cases it is useful to look at this to decide what needs to be done.
        !           919: 
        !           920:    MODE and WIN are passed so that this macro can use
        !           921:    GO_IF_LEGITIMATE_ADDRESS.
        !           922: 
        !           923:    It is always safe for this macro to do nothing.  It exists to recognize
        !           924:    opportunities to optimize the output.
        !           925: 
        !           926:    For the 80386, we handle X+REG by loading X into a register R and
        !           927:    using R+REG.  R will go in a general reg and indexing will be used.
        !           928:    However, if REG is a broken-out memory address or multiplication,
        !           929:    nothing needs to be done because REG can certainly go in a general reg.
        !           930: 
        !           931:    When -fpic is used, special handling is needed for symbolic references.
        !           932:    See comments by legitimize_pic_address in i386.c for details.  */
        !           933: 
        !           934: #define LEGITIMIZE_ADDRESS(X,OLDX,MODE,WIN)   \
        !           935: { extern rtx legitimize_pic_address ();                                        \
        !           936:   int ch = (X) != (OLDX);                                              \
        !           937:   if (flag_pic && SYMBOLIC_CONST (X))                                  \
        !           938:     {                                                                  \
        !           939:       (X) = legitimize_pic_address (X, 0);                             \
        !           940:       if (memory_address_p (MODE, X))                                  \
        !           941:        goto WIN;                                                       \
        !           942:     }                                                                  \
        !           943:   if (GET_CODE (X) == PLUS)                                            \
        !           944:     { if (GET_CODE (XEXP (X, 0)) == MULT)                              \
        !           945:        ch = 1, XEXP (X, 0) = force_operand (XEXP (X, 0), 0);           \
        !           946:       if (GET_CODE (XEXP (X, 1)) == MULT)                              \
        !           947:        ch = 1, XEXP (X, 1) = force_operand (XEXP (X, 1), 0);           \
        !           948:       if (ch && GET_CODE (XEXP (X, 1)) == REG                          \
        !           949:          && GET_CODE (XEXP (X, 0)) == REG)                             \
        !           950:        goto WIN;                                                       \
        !           951:       if (flag_pic && SYMBOLIC_CONST (XEXP (X, 1)))                    \
        !           952:         ch = 1, (X) = legitimize_pic_address (X, 0);                   \
        !           953:       if (ch) { GO_IF_LEGITIMATE_ADDRESS (MODE, X, WIN); }             \
        !           954:       if (GET_CODE (XEXP (X, 0)) == REG)                                \
        !           955:        { register rtx temp = gen_reg_rtx (Pmode);                      \
        !           956:          register rtx val = force_operand (XEXP (X, 1), temp);         \
        !           957:          if (val != temp) emit_move_insn (temp, val, 0);               \
        !           958:          XEXP (X, 1) = temp;                                           \
        !           959:          goto WIN; }                                                   \
        !           960:       else if (GET_CODE (XEXP (X, 1)) == REG)                          \
        !           961:        { register rtx temp = gen_reg_rtx (Pmode);                      \
        !           962:          register rtx val = force_operand (XEXP (X, 0), temp);         \
        !           963:          if (val != temp) emit_move_insn (temp, val, 0);               \
        !           964:          XEXP (X, 0) = temp;                                           \
        !           965:          goto WIN; }}}
        !           966: 
        !           967: /* Nonzero if the constant value X is a legitimate general operand
        !           968:    when generating PIC code.  It is given that flag_pic is on and 
        !           969:    that X satisfies CONSTANT_P or is a CONST_DOUBLE.  */
        !           970: 
        !           971: #define LEGITIMATE_PIC_OPERAND_P(X) \
        !           972:   (! SYMBOLIC_CONST (X)                                                        \
        !           973:    || (GET_CODE (X) == SYMBOL_REF && CONSTANT_POOL_ADDRESS_P (X)))
        !           974: 
        !           975: #define SYMBOLIC_CONST(X)      \
        !           976: (GET_CODE (X) == SYMBOL_REF                                            \
        !           977:  || GET_CODE (X) == LABEL_REF                                          \
        !           978:  || (GET_CODE (X) == CONST && symbolic_reference_mentioned_p (X)))
        !           979: 
        !           980: /* Go to LABEL if ADDR (a legitimate address expression)
        !           981:    has an effect that depends on the machine mode it is used for.
        !           982:    On the 80386, only postdecrement and postincrement address depend thus
        !           983:    (the amount of decrement or increment being the length of the operand).  */
        !           984: #define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR,LABEL)       \
        !           985:  if (GET_CODE (ADDR) == POST_INC || GET_CODE (ADDR) == POST_DEC) goto LABEL
        !           986: 
        !           987: /* Define this macro if references to a symbol must be treated
        !           988:    differently depending on something about the variable or
        !           989:    function named by the symbol (such as what section it is in).
        !           990: 
        !           991:    On i386, if using PIC, mark a SYMBOL_REF for a static declaration
        !           992:    so that we may access it directly in the GOT.  */
        !           993: 
        !           994: #define ENCODE_SECTION_INFO(DECL) \
        !           995: do                                                                     \
        !           996:   {                                                                    \
        !           997:     if (flag_pic)                                                      \
        !           998:       {                                                                        \
        !           999:        rtx decl_rtl = (TREE_CODE_CLASS (TREE_CODE (DECL)) == 'c'       \
        !          1000:                        ? TREE_CST_RTL (DECL) : DECL_RTL (DECL));       \
        !          1001:        SYMBOL_REF_FLAG (XEXP (decl_rtl, 0)) = ! TREE_PUBLIC (DECL);    \
        !          1002:       }                                                                        \
        !          1003:   }                                                                    \
        !          1004: while (0)
        !          1005: 
        !          1006: /* Specify the machine mode that this machine uses
        !          1007:    for the index in the tablejump instruction.  */
        !          1008: #define CASE_VECTOR_MODE Pmode
        !          1009: 
        !          1010: /* Define this if the tablejump instruction expects the table
        !          1011:    to contain offsets from the address of the table.
        !          1012:    Do not define this if the table should contain absolute addresses.  */
        !          1013: /* #define CASE_VECTOR_PC_RELATIVE */
        !          1014: 
        !          1015: /* Specify the tree operation to be used to convert reals to integers.
        !          1016:    This should be changed to take advantage of fist --wfs ??
        !          1017:  */
        !          1018: #define IMPLICIT_FIX_EXPR FIX_ROUND_EXPR
        !          1019: 
        !          1020: /* This is the kind of divide that is easiest to do in the general case.  */
        !          1021: #define EASY_DIV_EXPR TRUNC_DIV_EXPR
        !          1022: 
        !          1023: /* Define this as 1 if `char' should by default be signed; else as 0.  */
        !          1024: #define DEFAULT_SIGNED_CHAR 1
        !          1025: 
        !          1026: /* Max number of bytes we can move from memory to memory
        !          1027:    in one reasonably fast instruction.  */
        !          1028: #define MOVE_MAX 4
        !          1029: 
        !          1030: /* MOVE_RATIO is the number of move instructions that is better than a
        !          1031:    block move.  Make this large on i386, since the block move is very
        !          1032:    inefficient with small blocks, and the hard register needs of the
        !          1033:    block move require much reload work. */
        !          1034: #define MOVE_RATIO 5
        !          1035: 
        !          1036: /* Define this if zero-extension is slow (more than one real instruction).  */
        !          1037: /* #define SLOW_ZERO_EXTEND */
        !          1038: 
        !          1039: /* Nonzero if access to memory by bytes is slow and undesirable.  */
        !          1040: #define SLOW_BYTE_ACCESS 0
        !          1041: 
        !          1042: /* Define if shifts truncate the shift count
        !          1043:    which implies one can omit a sign-extension or zero-extension
        !          1044:    of a shift count.  */
        !          1045: /* One i386, shifts do truncate the count.  But bit opcodes don't. */
        !          1046: 
        !          1047: /* #define SHIFT_COUNT_TRUNCATED */
        !          1048: 
        !          1049: /* Value is 1 if truncating an integer of INPREC bits to OUTPREC bits
        !          1050:    is done just by pretending it is already truncated.  */
        !          1051: #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
        !          1052: 
        !          1053: /* We assume that the store-condition-codes instructions store 0 for false
        !          1054:    and some other value for true.  This is the value stored for true.  */
        !          1055: 
        !          1056: #define STORE_FLAG_VALUE 1
        !          1057: 
        !          1058: /* When a prototype says `char' or `short', really pass an `int'.
        !          1059:    (The 386 can't easily push less than an int.)  */
        !          1060: 
        !          1061: #define PROMOTE_PROTOTYPES
        !          1062: 
        !          1063: /* Specify the machine mode that pointers have.
        !          1064:    After generation of rtl, the compiler makes no further distinction
        !          1065:    between pointers and any other objects of this machine mode.  */
        !          1066: #define Pmode SImode
        !          1067: 
        !          1068: /* A function address in a call instruction
        !          1069:    is a byte address (for indexing purposes)
        !          1070:    so give the MEM rtx a byte's mode.  */
        !          1071: #define FUNCTION_MODE QImode
        !          1072: 
        !          1073: /* Define this if addresses of constant functions
        !          1074:    shouldn't be put through pseudo regs where they can be cse'd.
        !          1075:    Desirable on the 386 because a CALL with a constant address is
        !          1076:    not much slower than one with a register address.  */
        !          1077: #define NO_FUNCTION_CSE
        !          1078: 
        !          1079: /* Provide the costs of a rtl expression.  This is in the body of a
        !          1080:    switch on CODE. */
        !          1081: 
        !          1082: #define RTX_COSTS(X,CODE)                              \
        !          1083:   case MULT:                                           \
        !          1084:     return COSTS_N_INSNS (10);                         \
        !          1085:   case DIV:                                            \
        !          1086:   case UDIV:                                           \
        !          1087:   case MOD:                                            \
        !          1088:   case UMOD:                                           \
        !          1089:     return COSTS_N_INSNS (40);
        !          1090: 
        !          1091: 
        !          1092: /* Compute the cost of computing a constant rtl expression RTX
        !          1093:    whose rtx-code is CODE.  The body of this macro is a portion
        !          1094:    of a switch statement.  If the code is computed here,
        !          1095:    return it with a return statement.  Otherwise, break from the switch.  */
        !          1096: 
        !          1097: #define CONST_COSTS(RTX,CODE) \
        !          1098:   case CONST_INT:                                              \
        !          1099:   case CONST:                                                  \
        !          1100:   case LABEL_REF:                                              \
        !          1101:   case SYMBOL_REF:                                             \
        !          1102:     return flag_pic && SYMBOLIC_CONST (RTX) ? 2 : 0;           \
        !          1103:   case CONST_DOUBLE:                                           \
        !          1104:     {                                                          \
        !          1105:       int code = standard_80387_constant_p (RTX);              \
        !          1106:       return code == 1 ? 0 :                                   \
        !          1107:             code == 2 ? 1 :                                    \
        !          1108:                         2;                                     \
        !          1109:     }                                                          \
        !          1110:   case PLUS:                                                   \
        !          1111:     if (GET_CODE (XEXP (RTX, 0)) == REG                                \
        !          1112:         && GET_CODE (XEXP (RTX, 1)) == CONST_INT)              \
        !          1113:       return 1;
        !          1114: 
        !          1115: /* Compute the cost of an address.  This is meant to approximate the size
        !          1116:    and/or execution delay of an insn using that address.  If the cost is
        !          1117:    approximated by the RTL complexity, including CONST_COSTS above, as
        !          1118:    is usually the case for CISC machines, this macro should not be defined.
        !          1119:    For aggressively RISCy machines, only one insn format is allowed, so
        !          1120:    this macro should be a constant.  The value of this macro only matters
        !          1121:    for valid addresses.
        !          1122: 
        !          1123:    For i386, it is better to use a complex address than let gcc copy
        !          1124:    the address into a reg and make a new pseudo.  But not if the address
        !          1125:    requires to two regs - that would mean more pseudos with longer
        !          1126:    lifetimes.  */
        !          1127: 
        !          1128: #define ADDRESS_COST(RTX) \
        !          1129:   ((CONSTANT_P (RTX)                                           \
        !          1130:     || (GET_CODE (RTX) == PLUS && CONSTANT_P (XEXP (RTX, 1))   \
        !          1131:        && REG_P (XEXP (RTX, 0)))) ? 0                          \
        !          1132:    : REG_P (RTX) ? 1                                           \
        !          1133:    : 2)
        !          1134: 
        !          1135: /* Tell final.c how to eliminate redundant test instructions.  */
        !          1136: 
        !          1137: /* Here we define machine-dependent flags and fields in cc_status
        !          1138:    (see `conditions.h').  */
        !          1139: 
        !          1140: /* Set if the cc value is actually in the 80387, so a floating point
        !          1141:    conditional branch must be output.  */
        !          1142: #define CC_IN_80387 04000
        !          1143: 
        !          1144: /* Set if the CC value was stored in a nonstandard way, so that
        !          1145:    the state of equality is indicated by zero in the carry bit.  */
        !          1146: #define CC_Z_IN_NOT_C 010000
        !          1147: 
        !          1148: /* Store in cc_status the expressions
        !          1149:    that the condition codes will describe
        !          1150:    after execution of an instruction whose pattern is EXP.
        !          1151:    Do not alter them if the instruction would not alter the cc's.  */
        !          1152: 
        !          1153: #define NOTICE_UPDATE_CC(EXP, INSN) \
        !          1154:   notice_update_cc((EXP))
        !          1155: 
        !          1156: /* Output a signed jump insn.  Use template NORMAL ordinarily, or
        !          1157:    FLOAT following a floating point comparison.
        !          1158:    Use NO_OV following an arithmetic insn that set the cc's
        !          1159:    before a test insn that was deleted.
        !          1160:    NO_OV may be zero, meaning final should reinsert the test insn
        !          1161:    because the jump cannot be handled properly without it.  */
        !          1162: 
        !          1163: #define OUTPUT_JUMP(NORMAL, FLOAT, NO_OV)                      \
        !          1164: {                                                              \
        !          1165:   if (cc_prev_status.flags & CC_IN_80387)                      \
        !          1166:     return FLOAT;                                              \
        !          1167:   if (cc_prev_status.flags & CC_NO_OVERFLOW)                   \
        !          1168:     return NO_OV;                                              \
        !          1169:   return NORMAL;                                               \
        !          1170: }
        !          1171: 
        !          1172: /* Control the assembler format that we output, to the extent
        !          1173:    this does not vary between assemblers.  */
        !          1174: 
        !          1175: /* How to refer to registers in assembler output.
        !          1176:    This sequence is indexed by compiler's hard-register-number (see above). */
        !          1177: 
        !          1178: /* In order to refer to the first 8 regs as 32 bit regs prefix an "e"
        !          1179:    For non floating point regs, the following are the HImode names.
        !          1180: 
        !          1181:    For float regs, the stack top is sometimes referred to as "%st(0)"
        !          1182:    instead of just "%st".  PRINT_REG in i386.c handles with with the
        !          1183:    "y" code.  */
        !          1184: 
        !          1185: #define HI_REGISTER_NAMES \
        !          1186: {"ax","dx","cx","bx","si","di","bp","sp",          \
        !          1187:  "st","st(1)","st(2)","st(3)","st(4)","st(5)","st(6)","st(7)","" }
        !          1188: 
        !          1189: #define REGISTER_NAMES HI_REGISTER_NAMES
        !          1190: 
        !          1191: /* Table of additional register names to use in user input.  */
        !          1192: 
        !          1193: #define ADDITIONAL_REGISTER_NAMES \
        !          1194: { "eax", 0, "edx", 1, "ecx", 2, "ebx", 3,      \
        !          1195:   "esi", 4, "edi", 5, "ebp", 6, "esp", 7,      \
        !          1196:   "al", 0, "dl", 1, "cl", 2, "bl", 3,          \
        !          1197:   "ah", 0, "dh", 1, "ch", 2, "bh", 3 }
        !          1198: 
        !          1199: /* Note we are omitting these since currently I don't know how
        !          1200: to get gcc to use these, since they want the same but different
        !          1201: number as al, and ax.
        !          1202: */
        !          1203: 
        !          1204: /* note the last four are not really qi_registsers, but
        !          1205:    the md will have to never output movb into one of them
        !          1206:    only a movw .  There is no movb into the last four regs */
        !          1207: 
        !          1208: #define QI_REGISTER_NAMES \
        !          1209: {"al", "dl", "cl", "bl", "si", "di", "bp", "sp",}
        !          1210: 
        !          1211: /* These parallel the array above, and can be used to access bits 8:15
        !          1212:    of regs 0 through 3. */
        !          1213: 
        !          1214: #define QI_HIGH_REGISTER_NAMES \
        !          1215: {"ah", "dh", "ch", "bh", }
        !          1216: 
        !          1217: /* How to renumber registers for dbx and gdb.  */
        !          1218: 
        !          1219: /* {0,2,1,3,6,7,4,5,12,13,14,15,16,17}  */
        !          1220: #define DBX_REGISTER_NUMBER(n) \
        !          1221: ((n) == 0 ? 0 : \
        !          1222:  (n) == 1 ? 2 : \
        !          1223:  (n) == 2 ? 1 : \
        !          1224:  (n) == 3 ? 3 : \
        !          1225:  (n) == 4 ? 6 : \
        !          1226:  (n) == 5 ? 7 : \
        !          1227:  (n) == 6 ? 4 : \
        !          1228:  (n) == 7 ? 5 : \
        !          1229:  (n) + 4)
        !          1230: 
        !          1231: /* This is how to output the definition of a user-level label named NAME,
        !          1232:    such as the label on a static function or variable NAME.  */
        !          1233: 
        !          1234: #define ASM_OUTPUT_LABEL(FILE,NAME)    \
        !          1235:   (assemble_name (FILE, NAME), fputs (":\n", FILE))
        !          1236: 
        !          1237: /* This is how to output an assembler line defining a `double' constant.  */
        !          1238: 
        !          1239: #define ASM_OUTPUT_DOUBLE(FILE,VALUE)  \
        !          1240:   fprintf (FILE, "%s %.22e\n", ASM_DOUBLE, (VALUE))
        !          1241: 
        !          1242: 
        !          1243: /* This is how to output an assembler line defining a `float' constant.  */
        !          1244: 
        !          1245: #define ASM_OUTPUT_FLOAT(FILE,VALUE)  \
        !          1246: do { union { float f; long l;} tem;                    \
        !          1247:      tem.f = (VALUE);                                  \
        !          1248:      fprintf((FILE), "%s 0x%x\n", ASM_LONG, tem.l);    \
        !          1249:    } while (0)
        !          1250: 
        !          1251: 
        !          1252: /* Store in OUTPUT a string (made with alloca) containing
        !          1253:    an assembler-name for a local static variable named NAME.
        !          1254:    LABELNO is an integer which is different for each call.  */
        !          1255: 
        !          1256: #define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO) \
        !          1257: ( (OUTPUT) = (char *) alloca (strlen ((NAME)) + 10),   \
        !          1258:   sprintf ((OUTPUT), "%s.%d", (NAME), (LABELNO)))
        !          1259: 
        !          1260: 
        !          1261: 
        !          1262: /* This is how to output an assembler line defining an `int' constant.  */
        !          1263: 
        !          1264: #define ASM_OUTPUT_INT(FILE,VALUE)  \
        !          1265: ( fprintf (FILE, "%s ", ASM_LONG),             \
        !          1266:   output_addr_const (FILE,(VALUE)),            \
        !          1267:   putc('\n',FILE))
        !          1268: 
        !          1269: /* Likewise for `char' and `short' constants.  */
        !          1270: /* is this supposed to do align too?? */
        !          1271: 
        !          1272: #define ASM_OUTPUT_SHORT(FILE,VALUE)  \
        !          1273: ( fprintf (FILE, "%s ", ASM_SHORT),            \
        !          1274:   output_addr_const (FILE,(VALUE)),            \
        !          1275:   putc('\n',FILE))
        !          1276: 
        !          1277: /*
        !          1278: #define ASM_OUTPUT_SHORT(FILE,VALUE)  \
        !          1279: ( fprintf (FILE, "%s ", ASM_BYTE_OP),          \
        !          1280:   output_addr_const (FILE,(VALUE)),            \
        !          1281:   fputs (",", FILE),                           \
        !          1282:   output_addr_const (FILE,(VALUE)),            \
        !          1283:   fputs (" >> 8\n",FILE))
        !          1284: */
        !          1285: 
        !          1286: 
        !          1287: #define ASM_OUTPUT_CHAR(FILE,VALUE)  \
        !          1288: ( fprintf (FILE, "%s ", ASM_BYTE_OP),          \
        !          1289:   output_addr_const (FILE, (VALUE)),           \
        !          1290:   putc ('\n', FILE))
        !          1291: 
        !          1292: /* This is how to output an assembler line for a numeric constant byte.  */
        !          1293: 
        !          1294: #define ASM_OUTPUT_BYTE(FILE,VALUE)  \
        !          1295:   fprintf ((FILE), "%s 0x%x\n", ASM_BYTE_OP, (VALUE))
        !          1296: 
        !          1297: /* This is how to output an insn to push a register on the stack.
        !          1298:    It need not be very fast code.  */
        !          1299: 
        !          1300: #define ASM_OUTPUT_REG_PUSH(FILE,REGNO)  \
        !          1301:   fprintf (FILE, "\tpushl e%s\n", reg_names[REGNO])
        !          1302: 
        !          1303: /* This is how to output an insn to pop a register from the stack.
        !          1304:    It need not be very fast code.  */
        !          1305: 
        !          1306: #define ASM_OUTPUT_REG_POP(FILE,REGNO)  \
        !          1307:   fprintf (FILE, "\tpopl e%s\n", reg_names[REGNO])
        !          1308: 
        !          1309: /* This is how to output an element of a case-vector that is absolute.
        !          1310:      */
        !          1311: 
        !          1312: #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
        !          1313:   fprintf (FILE, "%s %s%d\n", ASM_LONG, LPREFIX, VALUE)
        !          1314: 
        !          1315: /* This is how to output an element of a case-vector that is relative.
        !          1316:    We don't use these on the 386 yet, because the ATT assembler can't do
        !          1317:    forward reference the differences.  
        !          1318:  */
        !          1319: 
        !          1320: #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, VALUE, REL) \
        !          1321:   fprintf (FILE, "\t.word %s%d-%s%d\n",LPREFIX, VALUE,LPREFIX, REL)
        !          1322: 
        !          1323: /* Define the parentheses used to group arithmetic operations
        !          1324:    in assembler code.  */
        !          1325: 
        !          1326: #define ASM_OPEN_PAREN ""
        !          1327: #define ASM_CLOSE_PAREN ""
        !          1328: 
        !          1329: /* Define results of standard character escape sequences.  */
        !          1330: #define TARGET_BELL 007
        !          1331: #define TARGET_BS 010
        !          1332: #define TARGET_TAB 011
        !          1333: #define TARGET_NEWLINE 012
        !          1334: #define TARGET_VT 013
        !          1335: #define TARGET_FF 014
        !          1336: #define TARGET_CR 015
        !          1337: 
        !          1338: /* Print operand X (an rtx) in assembler syntax to file FILE.
        !          1339:    CODE is a letter or dot (`z' in `%z0') or 0 if no letter was specified.
        !          1340:    The CODE z takes the size of operand from the following digit, and
        !          1341:    outputs b,w,or l respectively.
        !          1342: 
        !          1343:    On the 80386, we use several such letters:
        !          1344:    f -- float insn (print a CONST_DOUBLE as a float rather than in hex).
        !          1345:    L,W,B,Q,S -- print the opcode suffix for specified size of operand.
        !          1346:    R -- print the prefix for register names.
        !          1347:    z -- print the opcode suffix for the size of the current operand.
        !          1348:    * -- print a star (in certain assembler syntax)
        !          1349:    w -- print the operand as if it's a "word" (HImode) even if it isn't.
        !          1350:    b -- print the operand as if it's a byte (QImode) even if it isn't.
        !          1351:    c -- don't print special prefixes before constant operands.  */
        !          1352: 
        !          1353: #define PRINT_OPERAND_PUNCT_VALID_P(CODE)                              \
        !          1354:   ((CODE) == '*')
        !          1355: 
        !          1356: #define PRINT_OPERAND(FILE, X, CODE)  \
        !          1357:   print_operand (FILE, X, CODE)
        !          1358: 
        !          1359: 
        !          1360: #define PRINT_OPERAND_ADDRESS(FILE, ADDR)  \
        !          1361:   print_operand_address (FILE, ADDR)
        !          1362: 
        !          1363: /* Output the prefix for an immediate operand, or for an offset operand.  */
        !          1364: #define PRINT_IMMED_PREFIX(FILE)  fputs (IP, (FILE))
        !          1365: #define PRINT_OFFSET_PREFIX(FILE)  fputs (IP, (FILE))
        !          1366: 
        !          1367: /* Routines in libgcc that return floats must return them in an fp reg,
        !          1368:    just as other functions do which return such values.
        !          1369:    These macros make that happen.  */
        !          1370: 
        !          1371: #define FLOAT_VALUE_TYPE float
        !          1372: #define INTIFY(FLOATVAL) FLOATVAL
        !          1373: 
        !          1374: /* Nonzero if INSN magically clobbers register REGNO.  */
        !          1375: 
        !          1376: /* #define INSN_CLOBBERS_REGNO_P(INSN, REGNO)  \
        !          1377:     (FP_REGNO_P (REGNO)                                \
        !          1378:      && (GET_CODE (INSN) == JUMP_INSN || GET_CODE (INSN) == BARRIER))
        !          1379: */
        !          1380: 
        !          1381: /* a letter which is not needed by the normal asm syntax, which
        !          1382:    we can use for operand syntax in the extended asm */
        !          1383: 
        !          1384: #define ASM_OPERAND_LETTER '#'
        !          1385: 
        !          1386: #define RET return ""
        !          1387: #define AT_SP(mode) (gen_rtx (MEM, (mode), stack_pointer_rtx))
        !          1388: 
        !          1389: /*
        !          1390: Local variables:
        !          1391: version-control: t
        !          1392: End:
        !          1393: */

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