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Annotation of gcc/tm-convex.h, revision 1.1

1.1     ! root        1: /* Definitions of target machine for GNU compiler.  Convex version.
        !             2:    Copyright (C) 1989 Free Software Foundation, Inc.
        !             3: 
        !             4: This file is part of GNU CC.
        !             5: 
        !             6: GNU CC is distributed in the hope that it will be useful,
        !             7: but WITHOUT ANY WARRANTY.  No author or distributor
        !             8: accepts responsibility to anyone for the consequences of using it
        !             9: or for whether it serves any particular purpose or works at all,
        !            10: unless he says so in writing.  Refer to the GNU CC General Public
        !            11: License for full details.
        !            12: 
        !            13: Everyone is granted permission to copy, modify and redistribute
        !            14: GNU CC, but only under the conditions described in the
        !            15: GNU CC General Public License.   A copy of this license is
        !            16: supposed to have been given to you along with GNU CC so you
        !            17: can know your rights and responsibilities.  It should be in a
        !            18: file named COPYING.  Among other things, the copyright notice
        !            19: and this notice must be preserved on all copies.  */
        !            20: 
        !            21: 
        !            22: /* Names to predefine in the preprocessor for this target machine.  */
        !            23: 
        !            24: #define CPP_PREDEFINES "-Dconvex -Dunix"
        !            25: 
        !            26: /* Print subsidiary information on the compiler version in use.  */
        !            27: 
        !            28: #define TARGET_VERSION fprintf (stderr, " (convex)");
        !            29: 
        !            30: /* Run-time compilation parameters selecting different hardware subsets.  */
        !            31: 
        !            32: extern int target_flags;
        !            33: 
        !            34: /* Macros used in the machine description to test the flags.  */
        !            35: 
        !            36: /* 
        !            37:    -mc1                avoid C2-only instructions; default on C1 host
        !            38:    -mc2                use C2-only instructions; default on C2 host
        !            39:    -margcount  use standard calling sequence, with arg count word
        !            40:    -mnoargcount don't push arg count (it's in the symbol table) (usually)
        !            41: */
        !            42: 
        !            43: #define TARGET_C1 (target_flags & 1)
        !            44: #define TARGET_C2 (target_flags & 2)
        !            45: #define TARGET_ARGCOUNT (target_flags & 4)
        !            46: 
        !            47: /* Macro to define tables used to set the flags.
        !            48:    This is a list in braces of pairs in braces,
        !            49:    each pair being { "NAME", VALUE }
        !            50:    where VALUE is the bits to set or minus the bits to clear.
        !            51:    An empty string NAME is used to identify the default VALUE.  */
        !            52: 
        !            53: #define TARGET_SWITCHES \
        !            54:   { { "c1", 1 },       \
        !            55:     { "c2", 2 },       \
        !            56:     { "noc1", -1 },    \
        !            57:     { "noc2", -2 },    \
        !            58:     { "argcount", 4 },  \
        !            59:     { "noargcount", -4 }, \
        !            60:     { "", TARGET_DEFAULT }}
        !            61: 
        !            62: /* Default target_flags if no switches specified.  */
        !            63: 
        !            64: #define TARGET_DEFAULT 0
        !            65: 
        !            66: /* Pick a target if none was specified */
        !            67: 
        !            68: #define OVERRIDE_OPTIONS  override_options ();
        !            69: 
        !            70: /* Allow $ in identifiers */
        !            71: 
        !            72: #define DOLLARS_IN_IDENTIIFERS 1
        !            73: 
        !            74: /* Target machine storage layout */
        !            75: 
        !            76: /* Define this if most significant bit is lowest numbered
        !            77:    in instructions that operate on numbered bit-fields. */
        !            78: #define BITS_BIG_ENDIAN
        !            79: 
        !            80: /* Define this if most significant byte of a word is the lowest numbered.  */
        !            81: #define BYTES_BIG_ENDIAN
        !            82: 
        !            83: /* Define this if most significant word of a multiword number is numbered.  */
        !            84: /* #define WORDS_BIG_ENDIAN */
        !            85: 
        !            86: /* Number of bits in an addressible storage unit */
        !            87: #define BITS_PER_UNIT 8
        !            88: 
        !            89: /* Width in bits of a "word", which is the contents of a machine register.
        !            90:    Note that this is not necessarily the width of data type `int';
        !            91:    if using 16-bit ints on a 68000, this would still be 32.
        !            92:    But on a machine with 16-bit registers, this would be 16.  */
        !            93: #define BITS_PER_WORD 32
        !            94: 
        !            95: /* Width of a word, in units (bytes).  */
        !            96: #define UNITS_PER_WORD 4
        !            97: 
        !            98: /* Width in bits of a pointer.
        !            99:    See also the macro `Pmode' defined below.  */
        !           100: #define POINTER_SIZE 32
        !           101: 
        !           102: /* Allocation boundary (in *bits*) for storing pointers in memory.  */
        !           103: #define POINTER_BOUNDARY 32
        !           104: 
        !           105: /* Allocation boundary (in *bits*) for storing arguments in argument list.  */
        !           106: #define PARM_BOUNDARY 32
        !           107: 
        !           108: /* Boundary (in *bits*) on which stack pointer should be aligned.  */
        !           109: #define STACK_BOUNDARY 32
        !           110: 
        !           111: /* Allocation boundary (in *bits*) for the code of a function.  */
        !           112: #define FUNCTION_BOUNDARY 16
        !           113: 
        !           114: /* Alignment of field after `int : 0' in a structure.  */
        !           115: #define EMPTY_FIELD_BOUNDARY 32
        !           116: 
        !           117: /* Every structure's size must be a multiple of this.  */
        !           118: #define STRUCTURE_SIZE_BOUNDARY 8
        !           119: 
        !           120: /* No data type wants to be aligned rounder than this.  */
        !           121: /* beware of doubles in structs -- 64 is incompatible with pcc */
        !           122: #define BIGGEST_ALIGNMENT 32
        !           123: 
        !           124: /* Define this if move instructions will actually fail to work
        !           125:    when given unaligned data.  */
        !           126: /* #define STRICT_ALIGNMENT */
        !           127: 
        !           128: /* Standard register usage.  */
        !           129: 
        !           130: /* Number of actual hardware registers.
        !           131:    The hardware registers are assigned numbers for the compiler
        !           132:    from 0 to just below FIRST_PSEUDO_REGISTER.
        !           133:    All registers that the compiler knows about must be given numbers,
        !           134:    even those that are not normally considered general registers.  */
        !           135: #define FIRST_PSEUDO_REGISTER 16
        !           136: 
        !           137: /* 1 for registers that have pervasive standard uses
        !           138:    and are not available for the register allocator.
        !           139:    For Convex, these are AP, FP, and SP.  */
        !           140: #define FIXED_REGISTERS {0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 1} 
        !           141: 
        !           142: /* 1 for registers not available across function calls.
        !           143:    These must include the FIXED_REGISTERS and also any
        !           144:    registers that can be used without being saved.
        !           145:    The latter must include the registers where values are returned
        !           146:    and the register where structure-value addresses are passed.
        !           147:    Aside from that, you can include as many other registers as you like.  */
        !           148: #define CALL_USED_REGISTERS {1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1}
        !           149: 
        !           150: /* Return number of consecutive hard regs needed starting at reg REGNO
        !           151:    to hold something of mode MODE.
        !           152:    This is ordinarily the length in words of a value of mode MODE
        !           153:    but can be less for certain modes in special long registers.
        !           154:    On Convex, all values fit in one register.  */
        !           155: #define HARD_REGNO_NREGS(REGNO, MODE)   1
        !           156: 
        !           157: /* Value is 1 if hard register REGNO can hold a value of machine-mode MODE.
        !           158:    On Convex, S registers can hold any type, A registers can any nonfloat */
        !           159: #define HARD_REGNO_MODE_OK(REGNO, MODE) \
        !           160:   ((REGNO) < 8 || ((MODE) != SFmode && (MODE) != DFmode && (MODE) != DImode))
        !           161: 
        !           162: /* Value is 1 if it is a good idea to tie two pseudo registers
        !           163:    when one has mode MODE1 and one has mode MODE2.
        !           164:    If HARD_REGNO_MODE_OK could produce different values for MODE1 and MODE2,
        !           165:    for any hard reg, then this must be 0 for correct output.  */
        !           166: #define MODES_TIEABLE_P(MODE1, MODE2)  \
        !           167:     (((MODE1) == SFmode || (MODE1) == DFmode || (MODE1) == DImode) \
        !           168:      == ((MODE2) == SFmode || (MODE2) == DFmode || (MODE2) == DImode))
        !           169: 
        !           170: /* Specify the registers used for certain standard purposes.
        !           171:    The values of these macros are register numbers.  */
        !           172: 
        !           173: /* Register to use for pushing function arguments.  */
        !           174: #define STACK_POINTER_REGNUM 8
        !           175: 
        !           176: /* Base register for access to local variables of the function.  */
        !           177: #define FRAME_POINTER_REGNUM 15
        !           178: 
        !           179: /* Value should be nonzero if functions must have frame pointers.
        !           180:    Zero means the frame pointer need not be set up (and parms
        !           181:    may be accessed via the stack pointer) in functions that seem suitable.
        !           182:    This is computed in `reload', in reload1.c.  */
        !           183: #define FRAME_POINTER_REQUIRED 1
        !           184: 
        !           185: /* Base register for access to arguments of the function.  */
        !           186: #define ARG_POINTER_REGNUM 14
        !           187: 
        !           188: /* Register in which static-chain is passed to a function.  */
        !           189: #define STATIC_CHAIN_REGNUM 10
        !           190: 
        !           191: /* Register in which address to store a structure value
        !           192:    is passed to a function.  */
        !           193: #define STRUCT_VALUE_REGNUM 9
        !           194: 
        !           195: /* Define the classes of registers for register constraints in the
        !           196:    machine description.  Also define ranges of constants.
        !           197: 
        !           198:    One of the classes must always be named ALL_REGS and include all hard regs.
        !           199:    If there is more than one class, another class must be named NO_REGS
        !           200:    and contain no registers.
        !           201: 
        !           202:    The name GENERAL_REGS must be the name of a class (or an alias for
        !           203:    another name such as ALL_REGS).  This is the class of registers
        !           204:    that is allowed by "g" or "r" in a register constraint.
        !           205:    Also, registers outside this class are allocated only when
        !           206:    instructions express preferences for them.
        !           207: 
        !           208:    The classes must be numbered in nondecreasing order; that is,
        !           209:    a larger-numbered class must never be contained completely
        !           210:    in a smaller-numbered class.
        !           211: 
        !           212:    For any two classes, it is very desirable that there be another
        !           213:    class that represents their union.  */
        !           214:    
        !           215: /* Convex has classes A (address) and S (scalar).  Seems to work
        !           216:    better to put S first, here and in the md. */
        !           217: 
        !           218: enum reg_class { NO_REGS, S_REGS, A_REGS, ALL_REGS, LIM_REG_CLASSES };
        !           219: 
        !           220: #define N_REG_CLASSES (int) LIM_REG_CLASSES
        !           221: 
        !           222: /* Since GENERAL_REGS is the same class as ALL_REGS,
        !           223:    don't give it a different class number; just make it an alias.  */
        !           224: 
        !           225: #define GENERAL_REGS ALL_REGS
        !           226: 
        !           227: /* Give names of register classes as strings for dump file.   */
        !           228: 
        !           229: #define REG_CLASS_NAMES \
        !           230:  {"NO_REGS", "S_REGS", "A_REGS", "ALL_REGS" }
        !           231: 
        !           232: /* Define which registers fit in which classes.
        !           233:    This is an initializer for a vector of HARD_REG_SET
        !           234:    of length N_REG_CLASSES.  */
        !           235: 
        !           236: #define REG_CLASS_CONTENTS {0, 0x00ff, 0xff00, 0xffff}
        !           237: 
        !           238: /* The same information, inverted:
        !           239:    Return the class number of the smallest class containing
        !           240:    reg number REGNO.  This could be a conditional expression
        !           241:    or could index an array.  */
        !           242: 
        !           243: #define S_REGNO_P(REGNO) ((REGNO) < 8)
        !           244: #define A_REGNO_P(REGNO) ((REGNO) >= 8)
        !           245: 
        !           246: #define REGNO_REG_CLASS(REGNO) \
        !           247:   (S_REGNO_P (REGNO) ? S_REGS : A_REGS)
        !           248: 
        !           249: /* The class value for index registers, and the one for base regs.  */
        !           250: 
        !           251: #define INDEX_REG_CLASS A_REGS
        !           252: #define BASE_REG_CLASS A_REGS
        !           253: 
        !           254: /* Get reg_class from a letter such as appears in the machine description.  */
        !           255: /* S regs use the letter 'd' because 's' is taken. */
        !           256: 
        !           257: #define REG_CLASS_FROM_LETTER(C) \
        !           258:   ((C) == 'a' ? A_REGS : (C) == 'd' ? S_REGS : NO_REGS)
        !           259: 
        !           260: /* The letters I, J, K, L and M in a register constraint string
        !           261:    can be used to stand for particular ranges of immediate operands.
        !           262:    This macro defines what the ranges are.
        !           263:    C is the letter, and VALUE is a constant value.
        !           264:    Return 1 if VALUE is in the range specified by C.  */
        !           265: 
        !           266: /* Convex uses only I:
        !           267:    32-bit value with sign bit off, usable as immediate in DImode logical 
        !           268:      instructions and, or, xor */ 
        !           269: 
        !           270: #define CONST_OK_FOR_LETTER_P(VALUE, C)  ((VALUE) >= 0)
        !           271: 
        !           272: /* Similar, but for floating constants, and defining letters G and H.
        !           273:    Here VALUE is the CONST_DOUBLE rtx itself.  */
        !           274: /* Convex uses only G:
        !           275:    value usable in ld.d (low word 0) or ld.l (high word all sign) */
        !           276: 
        !           277: #define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C) \
        !           278:   (LD_D_P (VALUE) || LD_L_P (VALUE))
        !           279: 
        !           280: #define LD_D_P(X)  (CONST_DOUBLE_HIGH (X) == 0)
        !           281: #define LD_L_P(X)  (CONST_DOUBLE_HIGH (X) >= 0 ? \
        !           282:                    CONST_DOUBLE_LOW (X) == 0 : CONST_DOUBLE_LOW (X) == -1)
        !           283: 
        !           284: /* Given an rtx X being reloaded into a reg required to be
        !           285:    in class CLASS, return the class of reg to actually use.
        !           286:    In general this is just CLASS; but on some machines
        !           287:    in some cases it is preferable to use a more restrictive class.  */
        !           288: 
        !           289: #define PREFERRED_RELOAD_CLASS(X,CLASS)  (CLASS)
        !           290: 
        !           291: /* Return the maximum number of consecutive registers
        !           292:    needed to represent mode MODE in a register of class CLASS.  */
        !           293: #define CLASS_MAX_NREGS(CLASS, MODE) 1
        !           294: 
        !           295: /* Stack layout; function entry, exit and calling.  */
        !           296: 
        !           297: /* Define this if pushing a word on the stack
        !           298:    makes the stack pointer a smaller address.  */
        !           299: #define STACK_GROWS_DOWNWARD
        !           300: 
        !           301: /* Define this if the nominal address of the stack frame
        !           302:    is at the high-address end of the local variables;
        !           303:    that is, each additional local variable allocated
        !           304:    goes at a more negative offset in the frame.  */
        !           305: #define FRAME_GROWS_DOWNWARD
        !           306: 
        !           307: /* Offset within stack frame to start allocating local variables at.
        !           308:    If FRAME_GROWS_DOWNWARD, this is the offset to the END of the
        !           309:    first local allocated.  Otherwise, it is the offset to the BEGINNING
        !           310:    of the first local allocated.  */
        !           311: #define STARTING_FRAME_OFFSET 0
        !           312: 
        !           313: /* If we generate an insn to push BYTES bytes,
        !           314:    this says how many the stack pointer really advances by. */
        !           315: #define PUSH_ROUNDING(BYTES) (BYTES)
        !           316: 
        !           317: /* Offset of first parameter from the argument pointer register value.  */
        !           318: #define FIRST_PARM_OFFSET(FNDECL) 0
        !           319: 
        !           320: /* Value is 1 if returning from a function call automatically
        !           321:    pops the arguments described by the number-of-args field in the call.
        !           322:    FUNTYPE is the data type of the function (as a tree),
        !           323:    or for a library call it is an identifier node for the subroutine name. */
        !           324: /* The standard Convex call, with arg count word, includes popping the
        !           325:    args as part of the call template.  We optionally omit the arg count
        !           326:    word and let gcc combine the arg pops. */
        !           327: #define RETURN_POPS_ARGS(FUNTYPE) TARGET_ARGCOUNT
        !           328: 
        !           329: /* Define how to find the value returned by a function.
        !           330:    VALTYPE is the data type of the value (as a tree).
        !           331:    If the precise function being called is known, FUNC is its FUNCTION_DECL;
        !           332:    otherwise, FUNC is 0.  */
        !           333: 
        !           334: /* On Convex the return value is in S0 regardless.  */   
        !           335: 
        !           336: #define FUNCTION_VALUE(VALTYPE, FUNC)  \
        !           337:   gen_rtx (REG, TYPE_MODE (VALTYPE), 0)
        !           338: 
        !           339: /* Define how to find the value returned by a library function
        !           340:    assuming the value has mode MODE.  */
        !           341: 
        !           342: /* On Convex the return value is in S0 regardless.  */   
        !           343: 
        !           344: #define LIBCALL_VALUE(MODE)  gen_rtx (REG, MODE, 0)
        !           345: 
        !           346: /* 1 if N is a possible register number for a function value.
        !           347:    On the Convex, S0 is the only register thus used.  */
        !           348: 
        !           349: #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0)
        !           350: 
        !           351: /* 1 if N is a possible register number for function argument passing. */
        !           352: 
        !           353: #define FUNCTION_ARG_REGNO_P(N) 0
        !           354: 
        !           355: /* Define a data type for recording info about an argument list
        !           356:    during the scan of that argument list.  This data type should
        !           357:    hold all necessary information about the function itself
        !           358:    and about the args processed so far, enough to enable macros
        !           359:    such as FUNCTION_ARG to determine where the next arg should go.
        !           360: 
        !           361:    On the vax, this is a single integer, which is a number of bytes
        !           362:    of arguments scanned so far.  */
        !           363: 
        !           364: #define CUMULATIVE_ARGS int
        !           365: 
        !           366: /* Initialize a variable CUM of type CUMULATIVE_ARGS
        !           367:    for a call to a function whose data type is FNTYPE.
        !           368:    For a library call, FNTYPE is 0.
        !           369: 
        !           370:    On Convex, the offset starts at 0.  */
        !           371: 
        !           372: #define INIT_CUMULATIVE_ARGS(CUM,FNTYPE)       \
        !           373:  ((CUM) = 0)
        !           374: 
        !           375: /* Update the data in CUM to advance over an argument
        !           376:    of mode MODE and data type TYPE.
        !           377:    (TYPE is null for libcalls where that information may not be available.)  */
        !           378: 
        !           379: #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED)   \
        !           380:  ((CUM) += ((MODE) != BLKmode                  \
        !           381:            ? (GET_MODE_SIZE (MODE) + 3) & ~3   \
        !           382:            : (int_size_in_bytes (TYPE) + 3) & ~3))
        !           383: 
        !           384: /* Define where to put the arguments to a function.
        !           385:    Value is zero to push the argument on the stack,
        !           386:    or a hard register in which to store the argument.
        !           387: 
        !           388:    MODE is the argument's machine mode.
        !           389:    TYPE is the data type of the argument (as a tree).
        !           390:     This is null for libcalls where that information may
        !           391:     not be available.
        !           392:    CUM is a variable of type CUMULATIVE_ARGS which gives info about
        !           393:     the preceding args and about the function being called.
        !           394:    NAMED is nonzero if this argument is a named parameter
        !           395:     (otherwise it is an extra parameter matching an ellipsis).  */
        !           396: 
        !           397: /* On Convex, all args are pushed.  */   
        !           398: 
        !           399: #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) 0
        !           400: 
        !           401: /* This macro generates the assembly code for function entry.
        !           402:    FILE is a stdio stream to output the code to.
        !           403:    SIZE is an int: how many units of temporary storage to allocate.
        !           404:    Refer to the array `regs_ever_live' to determine which registers
        !           405:    to save; `regs_ever_live[I]' is nonzero if register number I
        !           406:    is ever used in the function.  This macro is responsible for
        !           407:    knowing which registers should not be saved even if used.  */
        !           408: 
        !           409: #define FUNCTION_PROLOGUE(FILE, SIZE)     \
        !           410: {  if ((SIZE) != 0) fprintf (FILE, "\tsub.w #%d,sp\n", (SIZE));}
        !           411: 
        !           412: /* Output assembler code to FILE to increment profiler label # LABELNO
        !           413:    for profiling a function entry.  */
        !           414: 
        !           415: #define FUNCTION_PROFILER(FILE, LABELNO)  \
        !           416:    fprintf (FILE, "\tldea LP%d,a1\n\tcallq mcount\n", (LABELNO));
        !           417: 
        !           418: /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
        !           419:    the stack pointer does not matter.  The value is tested only in
        !           420:    functions that have frame pointers.
        !           421:    No definition is equivalent to always zero.  */
        !           422: 
        !           423: #define EXIT_IGNORE_STACK 1
        !           424: 
        !           425: /* This macro generates the assembly code for function exit,
        !           426:    on machines that need it.  If FUNCTION_EPILOGUE is not defined
        !           427:    then individual return instructions are generated for each
        !           428:    return statement.  Args are same as for FUNCTION_PROLOGUE.  */
        !           429: 
        !           430: /* #define FUNCTION_EPILOGUE(FILE, SIZE)  */
        !           431: 
        !           432: /* If the memory address ADDR is relative to the frame pointer,
        !           433:    correct it to be relative to the stack pointer instead.
        !           434:    This is for when we don't use a frame pointer.
        !           435:    ADDR should be a variable name.  */
        !           436: 
        !           437: #define FIX_FRAME_POINTER_ADDRESS(ADDR,DEPTH) abort ();
        !           438: 
        !           439: /* Addressing modes, and classification of registers for them.  */
        !           440: 
        !           441: /* #define HAVE_POST_INCREMENT */
        !           442: /* #define HAVE_POST_DECREMENT */
        !           443: 
        !           444: /* #define HAVE_PRE_DECREMENT */
        !           445: /* #define HAVE_PRE_INCREMENT */
        !           446: 
        !           447: /* Macros to check register numbers against specific register classes.  */
        !           448: 
        !           449: /* These assume that REGNO is a hard or pseudo reg number.
        !           450:    They give nonzero only if REGNO is a hard reg of the suitable class
        !           451:    or a pseudo reg currently allocated to a suitable hard reg.
        !           452:    Since they use reg_renumber, they are safe only once reg_renumber
        !           453:    has been allocated, which happens in local-alloc.c.  */
        !           454: 
        !           455: #define REGNO_OK_FOR_INDEX_P(regno)  \
        !           456: (((regno) ^ 010) < 8 || ((reg_renumber[regno] ^ 010) & -8) == 0)
        !           457: #define REGNO_OK_FOR_BASE_P(regno) \
        !           458: (((regno) ^ 010) < 8 || ((reg_renumber[regno] ^ 010) & -8) == 0)
        !           459: 
        !           460: /* Maximum number of registers that can appear in a valid memory address.  */
        !           461: 
        !           462: #define MAX_REGS_PER_ADDRESS 1
        !           463: 
        !           464: /* 1 if X is an rtx for a constant that is a valid address.  */
        !           465: 
        !           466: #define CONSTANT_ADDRESS_P(X) CONSTANT_P (X)
        !           467: 
        !           468: /* Nonzero if the constant value X is a legitimate general operand.
        !           469:    It is given that X satisfies CONSTANT_P or is a CONST_DOUBLE.  */
        !           470: 
        !           471: /* For convex, any single-word constant is ok; the only contexts
        !           472:    allowing general_operand of mode DI or DF are movdi and movdf. */
        !           473: 
        !           474: #define LEGITIMATE_CONSTANT_P(X) \
        !           475:   (GET_CODE (X) != CONST_DOUBLE ? 1 : (LD_D_P (X) || LD_L_P (X)))
        !           476: 
        !           477: /* The macros REG_OK_FOR..._P assume that the arg is a REG rtx
        !           478:    and check its validity for a certain class.
        !           479:    We have two alternate definitions for each of them.
        !           480:    The usual definition accepts all pseudo regs; the other rejects
        !           481:    them unless they have been allocated suitable hard regs.
        !           482:    The symbol REG_OK_STRICT causes the latter definition to be used.
        !           483: 
        !           484:    Most source files want to accept pseudo regs in the hope that
        !           485:    they will get allocated to the class that the insn wants them to be in.
        !           486:    Source files for reload pass need to be strict.
        !           487:    After reload, it makes no difference, since pseudo regs have
        !           488:    been eliminated by then.  */
        !           489: 
        !           490: #ifndef REG_OK_STRICT
        !           491: 
        !           492: /* Nonzero if X is a hard reg that can be used as an index
        !           493:    or if it is a pseudo reg.  */
        !           494: #define REG_OK_FOR_INDEX_P(X) (REGNO (X) >= 8)
        !           495: /* Nonzero if X is a hard reg that can be used as a base reg
        !           496:    or if it is a pseudo reg.  */
        !           497: #define REG_OK_FOR_BASE_P(X) (REGNO (X) >= 8)
        !           498: 
        !           499: #else
        !           500: 
        !           501: /* Nonzero if X is a hard reg that can be used as an index.  */
        !           502: #define REG_OK_FOR_INDEX_P(X) REGNO_OK_FOR_INDEX_P (REGNO (X))
        !           503: /* Nonzero if X is a hard reg that can be used as a base reg.  */
        !           504: #define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
        !           505: 
        !           506: #endif
        !           507: 
        !           508: /* GO_IF_LEGITIMATE_ADDRESS recognizes an RTL expression
        !           509:    that is a valid memory address for an instruction.
        !           510:    The MODE argument is the machine mode for the MEM expression
        !           511:    that wants to use this address.
        !           512: 
        !           513:    For Convex, valid addresses are
        !           514:        indirectable or (MEM indirectable)
        !           515:    where indirectable is 
        !           516:        const, reg, (PLUS reg const) */
        !           517: 
        !           518: /* 1 if X is an address that we could indirect through.  */
        !           519: #define INDIRECTABLE_ADDRESS_P(X)  \
        !           520:   (CONSTANT_ADDRESS_P (X)                                              \
        !           521:    || (GET_CODE (X) == REG && REG_OK_FOR_BASE_P (X))                   \
        !           522:    || (GET_CODE (X) == PLUS                                            \
        !           523:        && GET_CODE (XEXP (X, 0)) == REG                                        \
        !           524:        && REG_OK_FOR_BASE_P (XEXP (X, 0))                              \
        !           525:        && CONSTANT_ADDRESS_P (XEXP (X, 1)))                            \
        !           526:    || (GET_CODE (X) == PLUS                                            \
        !           527:        && GET_CODE (XEXP (X, 1)) == REG                                        \
        !           528:        && REG_OK_FOR_BASE_P (XEXP (X, 1))                              \
        !           529:        && CONSTANT_ADDRESS_P (XEXP (X, 0))))
        !           530: 
        !           531: /* Go to ADDR if X is a valid address. */
        !           532: #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, ADDR)  \
        !           533: { register rtx xfoob = (X);                                            \
        !           534:   if (GET_CODE (xfoob) == REG) goto ADDR;                              \
        !           535:   if (INDIRECTABLE_ADDRESS_P (xfoob)) goto ADDR;                       \
        !           536:   xfoob = XEXP (X, 0);                                                 \
        !           537:   if (GET_CODE (X) == MEM && INDIRECTABLE_ADDRESS_P (xfoob))           \
        !           538:     goto ADDR;                                                         \
        !           539:   if (GET_CODE (X) == PRE_DEC && REG_P (xfoob)                         \
        !           540:       && REGNO (xfoob) == STACK_POINTER_REGNUM)                                \
        !           541:     goto ADDR; }
        !           542: 
        !           543: /* Try machine-dependent ways of modifying an illegitimate address
        !           544:    to be legitimate.  If we find one, return the new, valid address.
        !           545:    This macro is used in only one place: `memory_address' in explow.c.
        !           546: 
        !           547:    OLDX is the address as it was before break_out_memory_refs was called.
        !           548:    In some cases it is useful to look at this to decide what needs to be done.
        !           549: 
        !           550:    MODE and WIN are passed so that this macro can use
        !           551:    GO_IF_LEGITIMATE_ADDRESS.
        !           552: 
        !           553:    It is always safe for this macro to do nothing.  It exists to recognize
        !           554:    opportunities to optimize the output.
        !           555: 
        !           556:    For Convex, nothing needs to be done.  */
        !           557: 
        !           558: #define LEGITIMIZE_ADDRESS(X,OLDX,MODE,WIN)  {}
        !           559: 
        !           560: /* Go to LABEL if ADDR (a legitimate address expression)
        !           561:    has an effect that depends on the machine mode it is used for. */
        !           562: 
        !           563: #define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR,LABEL)  {}
        !           564: 
        !           565: /* Specify the machine mode that this machine uses
        !           566:    for the index in the tablejump instruction.  */
        !           567: #define CASE_VECTOR_MODE SImode
        !           568: 
        !           569: /* Define this if the case instruction expects the table
        !           570:    to contain offsets from the address of the table.
        !           571:    Do not define this if the table should contain absolute addresses.  */
        !           572: /* #define CASE_VECTOR_PC_RELATIVE */
        !           573: 
        !           574: /* Define this if the case instruction drops through after the table
        !           575:    when the index is out of range.  Don't define it if the case insn
        !           576:    jumps to the default label instead.  */
        !           577: /* #define CASE_DROPS_THROUGH */
        !           578: 
        !           579: /* Specify the tree operation to be used to convert reals to integers.  */
        !           580: #define IMPLICIT_FIX_EXPR FIX_ROUND_EXPR
        !           581: 
        !           582: /* This is the kind of divide that is easiest to do in the general case.  */
        !           583: #define EASY_DIV_EXPR TRUNC_DIV_EXPR
        !           584: 
        !           585: /* Define this as 1 if `char' should by default be signed; else as 0.  */
        !           586: #define DEFAULT_SIGNED_CHAR 1
        !           587: 
        !           588: /* This flag, if defined, says the same insns that convert to a signed fixnum
        !           589:    also convert validly to an unsigned one.  */
        !           590: #define FIXUNS_TRUNC_LIKE_FIX_TRUNC
        !           591: 
        !           592: /* Max number of bytes we can move from memory to memory
        !           593:    in one reasonably fast instruction.  */
        !           594: #define MOVE_MAX 8
        !           595: 
        !           596: /* Define this if zero-extension is slow (more than one real instruction).  */
        !           597: /* #define SLOW_ZERO_EXTEND */
        !           598: 
        !           599: /* Nonzero if access to memory by bytes is slow and undesirable.  */
        !           600: #define SLOW_BYTE_ACCESS 0
        !           601: 
        !           602: /* Define if shifts truncate the shift count
        !           603:    which implies one can omit a sign-extension or zero-extension
        !           604:    of a shift count.  */
        !           605: #define SHIFT_COUNT_TRUNCATED
        !           606: 
        !           607: /* Value is 1 if truncating an integer of INPREC bits to OUTPREC bits
        !           608:    is done just by pretending it is already truncated.  */
        !           609: #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
        !           610: 
        !           611: /* On Convex, it is as good to call a constant function address as to
        !           612:    call an address kept in a register. */
        !           613: #define NO_FUNCTION_CSE
        !           614: 
        !           615: /* When a prototype says `char' or `short', really pass an `int'.  */
        !           616: #define PROMOTE_PROTOTYPES
        !           617: 
        !           618: /* Specify the machine mode that pointers have.
        !           619:    After generation of rtl, the compiler makes no further distinction
        !           620:    between pointers and any other objects of this machine mode.  */
        !           621: #define Pmode SImode
        !           622: 
        !           623: /* A function address in a call instruction
        !           624:    is a byte address (for indexing purposes)
        !           625:    so give the MEM rtx a byte's mode.  */
        !           626: #define FUNCTION_MODE QImode
        !           627: 
        !           628: /* Compute the cost of computing a constant rtl expression RTX
        !           629:    whose rtx-code is CODE.  The body of this macro is a portion
        !           630:    of a switch statement.  If the code is computed here,
        !           631:    return it with a return statement.  Otherwise, break from the switch.  */
        !           632: 
        !           633: #define CONST_COSTS(RTX,CODE) \
        !           634:  case CONST: \
        !           635:  case LABEL_REF: \
        !           636:  case SYMBOL_REF: \
        !           637:  case CONST_INT: \
        !           638:    return 0; \
        !           639:  case CONST_DOUBLE: \
        !           640:    return 2;
        !           641: 
        !           642: /* Check a `double' value for validity for a particular machine mode.  */
        !           643: 
        !           644: #define CHECK_FLOAT_VALUE(mode, d) \
        !           645:   if ((mode) == SFmode) \
        !           646:     { \
        !           647:       if ((d) > 1.7014117331926443e+38) \
        !           648:        { error ("magnitude of constant too large for `float'"); \
        !           649:          (d) = 1.7014117331926443e+38; } \
        !           650:       else if ((d) < -1.7014117331926443e+38) \
        !           651:        { error ("magnitude of constant too large for `float'"); \
        !           652:          (d) = -1.7014117331926443e+38; } \
        !           653:       else if (((d) > 0) && ((d) < 2.9387358770557188e-39)) \
        !           654:        { warning ("`float' constant truncated to zero"); \
        !           655:          (d) = 0.0; } \
        !           656:       else if (((d) < 0) && ((d) > -2.9387358770557188e-39)) \
        !           657:        { warning ("`float' constant truncated to zero"); \
        !           658:          (d) = 0.0; } \
        !           659:     }
        !           660: 
        !           661: /* Tell final.c how to eliminate redundant test instructions.  */
        !           662: 
        !           663: /* Here we define machine-dependent flags and fields in cc_status
        !           664:    (see `conditions.h').  No extra ones are needed for convex.  */
        !           665: 
        !           666: /* Store in cc_status the expressions
        !           667:    that the condition codes will describe
        !           668:    after execution of an instruction whose pattern is EXP.
        !           669:    Do not alter them if the instruction would not alter the cc's.  */
        !           670: 
        !           671: #define NOTICE_UPDATE_CC(EXP,INSN)  {CC_STATUS_INIT;}
        !           672: 
        !           673: /* Control the assembler format that we output.  */
        !           674: 
        !           675: /* Output at beginning of assembler file.  */
        !           676: 
        !           677: #define ASM_FILE_START(FILE) fprintf (FILE, ";NO_APP\n")
        !           678: 
        !           679: /* Output to assembler file text saying following lines
        !           680:    may contain character constants, extra white space, comments, etc.  */
        !           681: 
        !           682: #define ASM_APP_ON ";APP\n"
        !           683: 
        !           684: /* Output to assembler file text saying following lines
        !           685:    no longer contain unusual constructs.  */
        !           686: 
        !           687: #define ASM_APP_OFF ";NO_APP\n"
        !           688: 
        !           689: /* Alignment with Convex's assembler goes like this:
        !           690:    .text will allow .align 1 or .align 2
        !           691:    .data allows 1,2,4,8 (at least; but those are all we need).
        !           692:    there is no .lcomm, must use explicit decls in .bss instead.
        !           693:    .text and .data have subsections, each starts on an 8-byte boundary.
        !           694:    So, since alignment is worth having, 
        !           695:    use ".text <n>" for 2**<n>-byte aligned text section --
        !           696:    this assumes that all lengths are multiples of their alignment.
        !           697:    use .align in .text if possible, and it's always possible in .data.
        !           698:    gcc arranges that everything in .bss is a multiple of 8, so it
        !           699:    stays aligned.
        !           700:    This is all handled in two routines in output-convex.c. */
        !           701: 
        !           702: extern char *set_section ();
        !           703: extern char *align_section ();
        !           704: 
        !           705: /* Output before read-only data.  */
        !           706: 
        !           707: #define TEXT_SECTION_ASM_OP set_section (".text")
        !           708: 
        !           709: /* Output before writable data.  */
        !           710: 
        !           711: #define DATA_SECTION_ASM_OP set_section (".data")
        !           712: 
        !           713: /* How to refer to registers in assembler output.
        !           714:    This sequence is indexed by compiler's hard-register-number (see above).  */
        !           715: 
        !           716: #define REGISTER_NAMES \
        !           717: {"s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7", \
        !           718:  "sp", "a1", "a2", "a3", "a4", "a5", "ap", "fp"}
        !           719: 
        !           720: /* This is BSD, so it wants DBX format.  */
        !           721: 
        !           722: #define DBX_DEBUGGING_INFO
        !           723: 
        !           724: /* How to renumber registers for dbx and gdb. */
        !           725: 
        !           726: #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
        !           727: 
        !           728: /* Do not break .stabs pseudos into continuations.  */
        !           729: 
        !           730: #define DBX_CONTIN_LENGTH 0
        !           731: 
        !           732: /* This is the char to use for continuation (in case we need to turn
        !           733:    continuation back on).  */
        !           734: 
        !           735: #define DBX_CONTIN_CHAR '?'
        !           736: 
        !           737: /* Don't use the `xsfoo;' construct in DBX output; this system
        !           738:    doesn't support it.  */
        !           739: 
        !           740: #define DBX_NO_XREFS
        !           741: 
        !           742: /* This is how to output the definition of a user-level label named NAME,
        !           743:    such as the label on a static function or variable NAME.  */
        !           744: 
        !           745: #define ASM_OUTPUT_LABEL(FILE,NAME)    \
        !           746:   do { assemble_name (FILE, NAME); fputs (":\n", FILE); } while (0)
        !           747: 
        !           748: /* This is how to output a command to make the user-level label named NAME
        !           749:    defined for reference from other files.  */
        !           750: 
        !           751: #define ASM_GLOBALIZE_LABEL(FILE,NAME) \
        !           752:   do { fputs (".globl ", FILE); assemble_name (FILE, NAME); fputs ("\n", FILE);} while (0)
        !           753: 
        !           754: /* This is how to output a reference to a user-level label named NAME.  */
        !           755: 
        !           756: #define ASM_OUTPUT_LABELREF(FILE,NAME) \
        !           757:   fprintf (FILE, "_%s", NAME)
        !           758: 
        !           759: /* This is how to output an internal numbered label where
        !           760:    PREFIX is the class of label and NUM is the number within the class.  */
        !           761: 
        !           762: #define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM)     \
        !           763:   fprintf (FILE, "%s%d:\n", PREFIX, NUM)
        !           764: 
        !           765: /* Put case tables in .text 2, where they will be word-aligned */
        !           766: 
        !           767: #define ASM_OUTPUT_CASE_LABEL(FILE,PREFIX,NUM,TABLE) \
        !           768:   fprintf (FILE, ".text 2\n"); \
        !           769:   ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM)
        !           770: 
        !           771: #define ASM_OUTPUT_CASE_END(FILE,NUM,TABLE) \
        !           772:   fprintf (FILE, ".text\n");
        !           773: 
        !           774: /* This is how to store into the string LABEL
        !           775:    the symbol_ref name of an internal numbered label where
        !           776:    PREFIX is the class of label and NUM is the number within the class.
        !           777:    This is suitable for output with `assemble_name'.  */
        !           778: 
        !           779: #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)  \
        !           780:   sprintf (LABEL, "*%s%d", PREFIX, NUM)
        !           781: 
        !           782: /* This is how to output an assembler line defining a `double' constant.
        !           783:    USE HEX until gcc is modified not to call this with DImode constants.  */
        !           784: 
        !           785: #define ASM_OUTPUT_DOUBLE(FILE,VALUE)  \
        !           786:   fprintf (FILE, "\tds.l 0x%016llx\n", (VALUE))
        !           787: 
        !           788: /* This is how to output an assembler line defining a `float' constant.  */
        !           789: 
        !           790: #define ASM_OUTPUT_FLOAT(FILE,VALUE)  \
        !           791:   fprintf (FILE, "\tds.s %.9#g\n", (VALUE))
        !           792: 
        !           793: /* This is how to output an assembler line defining an `int' constant.  */
        !           794: 
        !           795: #define ASM_OUTPUT_INT(FILE,VALUE)  \
        !           796: ( fprintf (FILE, "\tds.w "),                   \
        !           797:   output_addr_const (FILE, (VALUE)),           \
        !           798:   fprintf (FILE, "\n"))
        !           799: 
        !           800: /* Likewise for `char' and `short' constants.  */
        !           801: 
        !           802: #define ASM_OUTPUT_SHORT(FILE,VALUE)  \
        !           803: ( fprintf (FILE, "\tds.h "),                   \
        !           804:   output_addr_const (FILE, (VALUE)),           \
        !           805:   fprintf (FILE, "\n"))
        !           806: 
        !           807: #define ASM_OUTPUT_CHAR(FILE,VALUE)  \
        !           808: ( fprintf (FILE, "\tds.b "),                   \
        !           809:   output_addr_const (FILE, (VALUE)),           \
        !           810:   fprintf (FILE, "\n"))
        !           811: 
        !           812: /* This is how to output an assembler line for a numeric constant byte.  */
        !           813: 
        !           814: #define ASM_OUTPUT_BYTE(FILE,VALUE)  \
        !           815:   fprintf (FILE, "\tds.b %#x\n", (VALUE))
        !           816: 
        !           817: /* This is how to output a string */
        !           818: 
        !           819: #define ASM_OUTPUT_ASCII(FILE,STR,SIZE) do {                           \
        !           820:   int i;                                                               \
        !           821:   fprintf (FILE, "\tds.b \"");                                         \
        !           822:   for (i = 0; i < (SIZE); i++) {                                       \
        !           823:       register int c = (STR)[i] & 0377;                                        \
        !           824:       if (c >= ' ' && c < 0177 && c != '\\' && c != '"')               \
        !           825:          putc (c, FILE);                                               \
        !           826:       else                                                             \
        !           827:          fprintf (FILE, "\\%03o", c);}                                 \
        !           828:   fprintf (FILE, "\"\n");} while (0)
        !           829: 
        !           830: /* This is how to output an insn to push a register on the stack.
        !           831:    It need not be very fast code.  */
        !           832: 
        !           833: #define ASM_OUTPUT_REG_PUSH(FILE,REGNO)        \
        !           834:    fprintf (FILE, "\tpsh.%c %s\n",             \
        !           835:            S_REGNO_P (REGNO) ? 'l' : 'w',      \
        !           836:            reg_names[REGNO])
        !           837: 
        !           838: /* This is how to output an insn to pop a register from the stack.
        !           839:    It need not be very fast code.  */
        !           840: 
        !           841: #define ASM_OUTPUT_REG_POP(FILE,REGNO)         \
        !           842:    fprintf (FILE, "\tpop.%c %s\n",             \
        !           843:            S_REGNO_P (REGNO) ? 'l' : 'w',      \
        !           844:            reg_names[REGNO])
        !           845: 
        !           846: /* This is how to output an element of a case-vector that is absolute. */
        !           847: 
        !           848: #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
        !           849:   fprintf (FILE, "\tds.w L%d\n", VALUE)
        !           850: 
        !           851: /* This is how to output an element of a case-vector that is relative.  
        !           852:    (not used on Convex) */
        !           853: 
        !           854: #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, VALUE, REL)  \
        !           855:   fprintf (FILE, "\tds.w L%d-L%d\n", VALUE, REL)
        !           856: 
        !           857: /* This is how to output an assembler line
        !           858:    that says to advance the location counter
        !           859:    to a multiple of 2**LOG bytes.  */
        !           860: 
        !           861: #define ASM_OUTPUT_ALIGN(FILE,LOG)  \
        !           862:   fprintf (FILE, align_section (LOG));
        !           863: 
        !           864:  /* This is how to output an assembler line
        !           865:     that says to advance the location counter by SIZE bytes.  */
        !           866: 
        !           867: #define ASM_OUTPUT_SKIP(FILE,SIZE)  \
        !           868:   fprintf (FILE, "\tds.b %d(0)\n", (SIZE))
        !           869: 
        !           870: /* This says how to output an assembler line
        !           871:    to define a global common symbol.  */
        !           872: 
        !           873: #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)  \
        !           874: ( fputs (".comm ", (FILE)),                    \
        !           875:   assemble_name ((FILE), (NAME)),              \
        !           876:   fprintf ((FILE), ",%d\n", (ROUNDED)))
        !           877: 
        !           878: /* This says how to output an assembler line
        !           879:    to define a local common symbol.  */
        !           880: 
        !           881: #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)  \
        !           882: ( fprintf ((FILE), "%s\n", set_section (".bss")), \
        !           883:   assemble_name ((FILE), (NAME)),              \
        !           884:   fprintf ((FILE), ":\tbs.b %d\n", (ROUNDED)), \
        !           885:   fprintf ((FILE), "%s\n", set_section (0)))
        !           886: 
        !           887: /* Store in OUTPUT a string (made with alloca) containing
        !           888:    an assembler-name for a local static variable named NAME.
        !           889:    LABELNO is an integer which is different for each call.  */
        !           890: 
        !           891: #define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO) \
        !           892: ( (OUTPUT) = (char *) alloca (strlen ((NAME)) + 10),   \
        !           893:   sprintf ((OUTPUT), "%s.%d", (NAME), (LABELNO)))
        !           894: 
        !           895: /* Define the parentheses used to group arithmetic operations
        !           896:    in assembler code.  */
        !           897: 
        !           898: #define ASM_OPEN_PAREN "("
        !           899: #define ASM_CLOSE_PAREN ")"
        !           900: 
        !           901: /* Define results of standard character escape sequences.  */
        !           902: #define TARGET_BELL 007
        !           903: #define TARGET_BS 010
        !           904: #define TARGET_TAB 011
        !           905: #define TARGET_NEWLINE 012
        !           906: #define TARGET_VT 013
        !           907: #define TARGET_FF 014
        !           908: #define TARGET_CR 015
        !           909: 
        !           910: /* Print an instruction operand X on file FILE.
        !           911:    CODE is the code from the %-spec that requested printing this operand;
        !           912:    if `%z3' was used to print operand 3, then CODE is 'z'. */
        !           913: 
        !           914: #define PRINT_OPERAND(FILE, X, CODE)  \
        !           915: { if (GET_CODE (X) == REG)                                             \
        !           916:     fprintf (FILE, "%s", reg_name [REGNO (X)]);                                \
        !           917:   else if (GET_CODE (X) == MEM)                                                \
        !           918:     output_address (XEXP (X, 0));                                      \
        !           919:   else if (GET_CODE (X) == CONST_DOUBLE && GET_MODE (X) != DImode)     \
        !           920:     { union { double d; int i[2]; } u;                                 \
        !           921:       u.i[0] = CONST_DOUBLE_LOW (X); u.i[1] = CONST_DOUBLE_HIGH (X);   \
        !           922:       fprintf (FILE, "#%.20#g", u.d); }                                        \
        !           923:   else { putc ('#', FILE); output_addr_const (FILE, X); }}
        !           924: 
        !           925: /* Print a memory operand whose address is X, on file FILE. */
        !           926: 
        !           927: #define PRINT_OPERAND_ADDRESS(FILE, ADDR)                              \
        !           928: {                                                                      \
        !           929:   register rtx addr = ADDR;                                            \
        !           930:   register rtx index = 0;                                              \
        !           931:   register rtx offset = 0;                                             \
        !           932:                                                                        \
        !           933:   if (GET_CODE (addr) == MEM)                                          \
        !           934:     {                                                                          \
        !           935:       fprintf (FILE, "@");                                             \
        !           936:       addr = XEXP (addr, 0);                                           \
        !           937:     }                                                                  \
        !           938:                                                                        \
        !           939:   switch (GET_CODE (addr))                                             \
        !           940:     {                                                                  \
        !           941:     case REG:                                                          \
        !           942:       index = addr;                                                    \
        !           943:       break;                                                           \
        !           944:                                                                        \
        !           945:     case PLUS:                                                         \
        !           946:       index = XEXP (addr, 0);                                          \
        !           947:       if (REG_P (index))                                               \
        !           948:        offset = XEXP (addr, 1);                                        \
        !           949:       else                                                             \
        !           950:        {                                                               \
        !           951:          offset = XEXP (addr, 0);                                      \
        !           952:          index = XEXP (addr, 1);                                       \
        !           953:          if (! REG_P (index)) abort ();                                \
        !           954:         }                                                              \
        !           955:       break;                                                           \
        !           956:                                                                        \
        !           957:     default:                                                           \
        !           958:       offset = addr;                                                   \
        !           959:       break;                                                           \
        !           960:     }                                                                  \
        !           961:                                                                        \
        !           962:   if (offset)                                                          \
        !           963:     output_addr_const (FILE, offset);                                  \
        !           964:                                                                        \
        !           965:   if (index)                                                           \
        !           966:     fprintf (FILE, "(%s)", reg_name[REGNO (index)]);                   \
        !           967: }
        !           968: 

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