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

1.1     ! root        1: /* Definitions of target machine for GNU compiler.  Vax version.
        !             2:    Copyright (C) 1987, 1988, 1991, 1993 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: /* Names to predefine in the preprocessor for this target machine.  */
        !            22: 
        !            23: #define CPP_PREDEFINES "-Dvax -Dunix"
        !            24: 
        !            25: /* If using g-format floating point, alter math.h.  */
        !            26: 
        !            27: #define        CPP_SPEC "%{mg:-DGFLOAT}"
        !            28: 
        !            29: /* Choose proper libraries depending on float format.
        !            30:    Note that there are no profiling libraries for g-format.
        !            31:    Also use -lg for the sake of dbx.  */
        !            32: 
        !            33: #define LIB_SPEC "%{g:-lg}\
        !            34:  %{mg:%{lm:-lmg} -lcg \
        !            35:   %{p:%eprofiling not supported with -mg\n}\
        !            36:   %{pg:%eprofiling not supported with -mg\n}}\
        !            37:  %{!mg:%{!p:%{!pg:-lc}}%{p:-lc_p}%{pg:-lc_p}}"
        !            38: 
        !            39: /* Print subsidiary information on the compiler version in use.  */
        !            40: 
        !            41: #define TARGET_VERSION fprintf (stderr, " (vax)");
        !            42: 
        !            43: /* Run-time compilation parameters selecting different hardware subsets.  */
        !            44: 
        !            45: extern int target_flags;
        !            46: 
        !            47: /* Macros used in the machine description to test the flags.  */
        !            48: 
        !            49: /* Nonzero if compiling code that Unix assembler can assemble.  */
        !            50: #define TARGET_UNIX_ASM (target_flags & 1)
        !            51: 
        !            52: /* Nonzero if compiling with VAX-11 "C" style structure alignment */
        !            53: #define        TARGET_VAXC_ALIGNMENT (target_flags & 2)
        !            54: 
        !            55: /* Nonzero if compiling with `G'-format floating point */
        !            56: #define TARGET_G_FLOAT (target_flags & 4)
        !            57: 
        !            58: /* Macro to define tables used to set the flags.
        !            59:    This is a list in braces of pairs in braces,
        !            60:    each pair being { "NAME", VALUE }
        !            61:    where VALUE is the bits to set or minus the bits to clear.
        !            62:    An empty string NAME is used to identify the default VALUE.  */
        !            63: 
        !            64: #define TARGET_SWITCHES  \
        !            65:   { {"unix", 1},  \
        !            66:     {"gnu", -1},  \
        !            67:     {"vaxc-alignment", 2}, \
        !            68:     {"g", 4}, \
        !            69:     {"g-float", 4}, \
        !            70:     {"d", -4}, \
        !            71:     {"d-float", -4}, \
        !            72:     { "", TARGET_DEFAULT}}
        !            73: 
        !            74: /* Default target_flags if no switches specified.  */
        !            75: 
        !            76: #ifndef TARGET_DEFAULT
        !            77: #define TARGET_DEFAULT 1
        !            78: #endif
        !            79: 
        !            80: /* Target machine storage layout */
        !            81: 
        !            82: /* Define for software floating point emulation of VAX format
        !            83:    when cross compiling from a non-VAX host. */
        !            84: /* #define REAL_ARITHMETIC */
        !            85: 
        !            86: /* Define this if most significant bit is lowest numbered
        !            87:    in instructions that operate on numbered bit-fields.
        !            88:    This is not true on the vax.  */
        !            89: #define BITS_BIG_ENDIAN 0
        !            90: 
        !            91: /* Define this if most significant byte of a word is the lowest numbered.  */
        !            92: /* That is not true on the vax.  */
        !            93: #define BYTES_BIG_ENDIAN 0
        !            94: 
        !            95: /* Define this if most significant word of a multiword number is the lowest
        !            96:    numbered.  */
        !            97: /* This is not true on the vax.  */
        !            98: #define WORDS_BIG_ENDIAN 0
        !            99: 
        !           100: /* Number of bits in an addressable storage unit */
        !           101: #define BITS_PER_UNIT 8
        !           102: 
        !           103: /* Width in bits of a "word", which is the contents of a machine register.
        !           104:    Note that this is not necessarily the width of data type `int';
        !           105:    if using 16-bit ints on a 68000, this would still be 32.
        !           106:    But on a machine with 16-bit registers, this would be 16.  */
        !           107: #define BITS_PER_WORD 32
        !           108: 
        !           109: /* Width of a word, in units (bytes).  */
        !           110: #define UNITS_PER_WORD 4
        !           111: 
        !           112: /* Width in bits of a pointer.
        !           113:    See also the macro `Pmode' defined below.  */
        !           114: #define POINTER_SIZE 32
        !           115: 
        !           116: /* Allocation boundary (in *bits*) for storing arguments in argument list.  */
        !           117: #define PARM_BOUNDARY 32
        !           118: 
        !           119: /* Allocation boundary (in *bits*) for the code of a function.  */
        !           120: #define FUNCTION_BOUNDARY 16
        !           121: 
        !           122: /* Alignment of field after `int : 0' in a structure.  */
        !           123: #define EMPTY_FIELD_BOUNDARY (TARGET_VAXC_ALIGNMENT ? 8 : 32)
        !           124: 
        !           125: /* Every structure's size must be a multiple of this.  */
        !           126: #define STRUCTURE_SIZE_BOUNDARY 8
        !           127: 
        !           128: /* A bitfield declared as `int' forces `int' alignment for the struct.  */
        !           129: #define PCC_BITFIELD_TYPE_MATTERS (! TARGET_VAXC_ALIGNMENT)
        !           130: 
        !           131: /* No data type wants to be aligned rounder than this.  */
        !           132: #define BIGGEST_ALIGNMENT 32
        !           133: 
        !           134: /* No structure field wants to be aligned rounder than this.  */
        !           135: #define BIGGEST_FIELD_ALIGNMENT (TARGET_VAXC_ALIGNMENT ? 8 : 32)
        !           136: 
        !           137: /* Set this nonzero if move instructions will actually fail to work
        !           138:    when given unaligned data.  */
        !           139: #define STRICT_ALIGNMENT 0
        !           140: 
        !           141: /* Let's keep the stack somewhat aligned.  */
        !           142: #define STACK_BOUNDARY 32
        !           143: 
        !           144: /* Standard register usage.  */
        !           145: 
        !           146: /* Number of actual hardware registers.
        !           147:    The hardware registers are assigned numbers for the compiler
        !           148:    from 0 to just below FIRST_PSEUDO_REGISTER.
        !           149:    All registers that the compiler knows about must be given numbers,
        !           150:    even those that are not normally considered general registers.  */
        !           151: #define FIRST_PSEUDO_REGISTER 16
        !           152: 
        !           153: /* 1 for registers that have pervasive standard uses
        !           154:    and are not available for the register allocator.
        !           155:    On the vax, these are the AP, FP, SP and PC.  */
        !           156: #define FIXED_REGISTERS {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1}
        !           157: 
        !           158: /* 1 for registers not available across function calls.
        !           159:    These must include the FIXED_REGISTERS and also any
        !           160:    registers that can be used without being saved.
        !           161:    The latter must include the registers where values are returned
        !           162:    and the register where structure-value addresses are passed.
        !           163:    Aside from that, you can include as many other registers as you like.  */
        !           164: #define CALL_USED_REGISTERS {1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1}
        !           165: 
        !           166: /* Return number of consecutive hard regs needed starting at reg REGNO
        !           167:    to hold something of mode MODE.
        !           168:    This is ordinarily the length in words of a value of mode MODE
        !           169:    but can be less for certain modes in special long registers.
        !           170:    On the vax, all registers are one word long.  */
        !           171: #define HARD_REGNO_NREGS(REGNO, MODE)   \
        !           172:  ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
        !           173: 
        !           174: /* Value is 1 if hard register REGNO can hold a value of machine-mode MODE.
        !           175:    On the vax, all registers can hold all modes.  */
        !           176: #define HARD_REGNO_MODE_OK(REGNO, MODE) 1
        !           177: 
        !           178: /* Value is 1 if it is a good idea to tie two pseudo registers
        !           179:    when one has mode MODE1 and one has mode MODE2.
        !           180:    If HARD_REGNO_MODE_OK could produce different values for MODE1 and MODE2,
        !           181:    for any hard reg, then this must be 0 for correct output.  */
        !           182: #define MODES_TIEABLE_P(MODE1, MODE2)  1
        !           183: 
        !           184: /* Specify the registers used for certain standard purposes.
        !           185:    The values of these macros are register numbers.  */
        !           186: 
        !           187: /* Vax pc is overloaded on a register.  */
        !           188: #define PC_REGNUM 15
        !           189: 
        !           190: /* Register to use for pushing function arguments.  */
        !           191: #define STACK_POINTER_REGNUM 14
        !           192: 
        !           193: /* Base register for access to local variables of the function.  */
        !           194: #define FRAME_POINTER_REGNUM 13
        !           195: 
        !           196: /* Value should be nonzero if functions must have frame pointers.
        !           197:    Zero means the frame pointer need not be set up (and parms
        !           198:    may be accessed via the stack pointer) in functions that seem suitable.
        !           199:    This is computed in `reload', in reload1.c.  */
        !           200: #define FRAME_POINTER_REQUIRED 1
        !           201: 
        !           202: /* Base register for access to arguments of the function.  */
        !           203: #define ARG_POINTER_REGNUM 12
        !           204: 
        !           205: /* Register in which static-chain is passed to a function.  */
        !           206: #define STATIC_CHAIN_REGNUM 0
        !           207: 
        !           208: /* Register in which address to store a structure value
        !           209:    is passed to a function.  */
        !           210: #define STRUCT_VALUE_REGNUM 1
        !           211: 
        !           212: /* Define the classes of registers for register constraints in the
        !           213:    machine description.  Also define ranges of constants.
        !           214: 
        !           215:    One of the classes must always be named ALL_REGS and include all hard regs.
        !           216:    If there is more than one class, another class must be named NO_REGS
        !           217:    and contain no registers.
        !           218: 
        !           219:    The name GENERAL_REGS must be the name of a class (or an alias for
        !           220:    another name such as ALL_REGS).  This is the class of registers
        !           221:    that is allowed by "g" or "r" in a register constraint.
        !           222:    Also, registers outside this class are allocated only when
        !           223:    instructions express preferences for them.
        !           224: 
        !           225:    The classes must be numbered in nondecreasing order; that is,
        !           226:    a larger-numbered class must never be contained completely
        !           227:    in a smaller-numbered class.
        !           228: 
        !           229:    For any two classes, it is very desirable that there be another
        !           230:    class that represents their union.  */
        !           231:    
        !           232: /* The vax has only one kind of registers, so NO_REGS and ALL_REGS
        !           233:    are the only classes.  */
        !           234: 
        !           235: enum reg_class { NO_REGS, ALL_REGS, LIM_REG_CLASSES };
        !           236: 
        !           237: #define N_REG_CLASSES (int) LIM_REG_CLASSES
        !           238: 
        !           239: /* Since GENERAL_REGS is the same class as ALL_REGS,
        !           240:    don't give it a different class number; just make it an alias.  */
        !           241: 
        !           242: #define GENERAL_REGS ALL_REGS
        !           243: 
        !           244: /* Give names of register classes as strings for dump file.   */
        !           245: 
        !           246: #define REG_CLASS_NAMES \
        !           247:  {"NO_REGS", "ALL_REGS" }
        !           248: 
        !           249: /* Define which registers fit in which classes.
        !           250:    This is an initializer for a vector of HARD_REG_SET
        !           251:    of length N_REG_CLASSES.  */
        !           252: 
        !           253: #define REG_CLASS_CONTENTS {0, 0xffff}
        !           254: 
        !           255: /* The same information, inverted:
        !           256:    Return the class number of the smallest class containing
        !           257:    reg number REGNO.  This could be a conditional expression
        !           258:    or could index an array.  */
        !           259: 
        !           260: #define REGNO_REG_CLASS(REGNO) ALL_REGS
        !           261: 
        !           262: /* The class value for index registers, and the one for base regs.  */
        !           263: 
        !           264: #define INDEX_REG_CLASS ALL_REGS
        !           265: #define BASE_REG_CLASS ALL_REGS
        !           266: 
        !           267: /* Get reg_class from a letter such as appears in the machine description.  */
        !           268: 
        !           269: #define REG_CLASS_FROM_LETTER(C) NO_REGS
        !           270: 
        !           271: /* The letters I, J, K, L and M in a register constraint string
        !           272:    can be used to stand for particular ranges of immediate operands.
        !           273:    This macro defines what the ranges are.
        !           274:    C is the letter, and VALUE is a constant value.
        !           275:    Return 1 if VALUE is in the range specified by C.
        !           276: 
        !           277:    `I' is the constant zero.  */
        !           278: 
        !           279: #define CONST_OK_FOR_LETTER_P(VALUE, C) \
        !           280:   ((C) == 'I' ? (VALUE) == 0           \
        !           281:    : 0)
        !           282: 
        !           283: /* Similar, but for floating constants, and defining letters G and H.
        !           284:    Here VALUE is the CONST_DOUBLE rtx itself. 
        !           285: 
        !           286:    `G' is a floating-point zero.  */
        !           287: 
        !           288: #define CONST_DOUBLE_OK_FOR_LETTER_P(VALUE, C) \
        !           289:   ((C) == 'G' ? ((VALUE) == CONST0_RTX (DFmode)                \
        !           290:                 || (VALUE) == CONST0_RTX (SFmode))     \
        !           291:    : 0)
        !           292: 
        !           293: /* Optional extra constraints for this machine.
        !           294: 
        !           295:    For the VAX, `Q' means that OP is a MEM that does not have a mode-dependent
        !           296:    address.  */
        !           297: 
        !           298: #define EXTRA_CONSTRAINT(OP, C) \
        !           299:   ((C) == 'Q'                                                          \
        !           300:    ? GET_CODE (OP) == MEM && ! mode_dependent_address_p (XEXP (OP, 0)) \
        !           301:    : 0)
        !           302: 
        !           303: /* Given an rtx X being reloaded into a reg required to be
        !           304:    in class CLASS, return the class of reg to actually use.
        !           305:    In general this is just CLASS; but on some machines
        !           306:    in some cases it is preferable to use a more restrictive class.  */
        !           307: 
        !           308: #define PREFERRED_RELOAD_CLASS(X,CLASS)  (CLASS)
        !           309: 
        !           310: /* Return the maximum number of consecutive registers
        !           311:    needed to represent mode MODE in a register of class CLASS.  */
        !           312: /* On the vax, this is always the size of MODE in words,
        !           313:    since all registers are the same size.  */
        !           314: #define CLASS_MAX_NREGS(CLASS, MODE)   \
        !           315:  ((GET_MODE_SIZE (MODE) + UNITS_PER_WORD - 1) / UNITS_PER_WORD)
        !           316: 
        !           317: /* Stack layout; function entry, exit and calling.  */
        !           318: 
        !           319: /* Define this if pushing a word on the stack
        !           320:    makes the stack pointer a smaller address.  */
        !           321: #define STACK_GROWS_DOWNWARD
        !           322: 
        !           323: /* Define this if longjmp restores from saved registers
        !           324:    rather than from what setjmp saved.  */
        !           325: #define LONGJMP_RESTORE_FROM_STACK
        !           326: 
        !           327: /* Define this if the nominal address of the stack frame
        !           328:    is at the high-address end of the local variables;
        !           329:    that is, each additional local variable allocated
        !           330:    goes at a more negative offset in the frame.  */
        !           331: #define FRAME_GROWS_DOWNWARD
        !           332: 
        !           333: /* Offset within stack frame to start allocating local variables at.
        !           334:    If FRAME_GROWS_DOWNWARD, this is the offset to the END of the
        !           335:    first local allocated.  Otherwise, it is the offset to the BEGINNING
        !           336:    of the first local allocated.  */
        !           337: #define STARTING_FRAME_OFFSET 0
        !           338: 
        !           339: /* Given an rtx for the address of a frame,
        !           340:    return an rtx for the address of the word in the frame
        !           341:    that holds the dynamic chain--the previous frame's address.  */
        !           342: #define DYNAMIC_CHAIN_ADDRESS(frame) \
        !           343: gen_rtx (PLUS, Pmode, frame, gen_rtx (CONST_INT, VOIDmode, 12))
        !           344: 
        !           345: /* If we generate an insn to push BYTES bytes,
        !           346:    this says how many the stack pointer really advances by.
        !           347:    On the vax, -(sp) pushes only the bytes of the operands.  */
        !           348: #define PUSH_ROUNDING(BYTES) (BYTES)
        !           349: 
        !           350: /* Offset of first parameter from the argument pointer register value.  */
        !           351: #define FIRST_PARM_OFFSET(FNDECL) 4
        !           352: 
        !           353: /* Value is the number of bytes of arguments automatically
        !           354:    popped when returning from a subroutine call.
        !           355:    FUNTYPE is the data type of the function (as a tree),
        !           356:    or for a library call it is an identifier node for the subroutine name.
        !           357:    SIZE is the number of bytes of arguments passed on the stack.
        !           358: 
        !           359:    On the Vax, the RET insn always pops all the args for any function.  */
        !           360: 
        !           361: #define RETURN_POPS_ARGS(FUNTYPE,SIZE) (SIZE)
        !           362: 
        !           363: /* Define how to find the value returned by a function.
        !           364:    VALTYPE is the data type of the value (as a tree).
        !           365:    If the precise function being called is known, FUNC is its FUNCTION_DECL;
        !           366:    otherwise, FUNC is 0.  */
        !           367: 
        !           368: /* On the Vax the return value is in R0 regardless.  */   
        !           369: 
        !           370: #define FUNCTION_VALUE(VALTYPE, FUNC)  \
        !           371:   gen_rtx (REG, TYPE_MODE (VALTYPE), 0)
        !           372: 
        !           373: /* Define how to find the value returned by a library function
        !           374:    assuming the value has mode MODE.  */
        !           375: 
        !           376: /* On the Vax the return value is in R0 regardless.  */   
        !           377: 
        !           378: #define LIBCALL_VALUE(MODE)  gen_rtx (REG, MODE, 0)
        !           379: 
        !           380: /* Define this if PCC uses the nonreentrant convention for returning
        !           381:    structure and union values.  */
        !           382: 
        !           383: #define PCC_STATIC_STRUCT_RETURN
        !           384: 
        !           385: /* 1 if N is a possible register number for a function value.
        !           386:    On the Vax, R0 is the only register thus used.  */
        !           387: 
        !           388: #define FUNCTION_VALUE_REGNO_P(N) ((N) == 0)
        !           389: 
        !           390: /* 1 if N is a possible register number for function argument passing.
        !           391:    On the Vax, no registers are used in this way.  */
        !           392: 
        !           393: #define FUNCTION_ARG_REGNO_P(N) 0
        !           394: 
        !           395: /* Define a data type for recording info about an argument list
        !           396:    during the scan of that argument list.  This data type should
        !           397:    hold all necessary information about the function itself
        !           398:    and about the args processed so far, enough to enable macros
        !           399:    such as FUNCTION_ARG to determine where the next arg should go.
        !           400: 
        !           401:    On the vax, this is a single integer, which is a number of bytes
        !           402:    of arguments scanned so far.  */
        !           403: 
        !           404: #define CUMULATIVE_ARGS int
        !           405: 
        !           406: /* Initialize a variable CUM of type CUMULATIVE_ARGS
        !           407:    for a call to a function whose data type is FNTYPE.
        !           408:    For a library call, FNTYPE is 0.
        !           409: 
        !           410:    On the vax, the offset starts at 0.  */
        !           411: 
        !           412: #define INIT_CUMULATIVE_ARGS(CUM,FNTYPE,LIBNAME)       \
        !           413:  ((CUM) = 0)
        !           414: 
        !           415: /* Update the data in CUM to advance over an argument
        !           416:    of mode MODE and data type TYPE.
        !           417:    (TYPE is null for libcalls where that information may not be available.)  */
        !           418: 
        !           419: #define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED)   \
        !           420:  ((CUM) += ((MODE) != BLKmode                  \
        !           421:            ? (GET_MODE_SIZE (MODE) + 3) & ~3   \
        !           422:            : (int_size_in_bytes (TYPE) + 3) & ~3))
        !           423: 
        !           424: /* Define where to put the arguments to a function.
        !           425:    Value is zero to push the argument on the stack,
        !           426:    or a hard register in which to store the argument.
        !           427: 
        !           428:    MODE is the argument's machine mode.
        !           429:    TYPE is the data type of the argument (as a tree).
        !           430:     This is null for libcalls where that information may
        !           431:     not be available.
        !           432:    CUM is a variable of type CUMULATIVE_ARGS which gives info about
        !           433:     the preceding args and about the function being called.
        !           434:    NAMED is nonzero if this argument is a named parameter
        !           435:     (otherwise it is an extra parameter matching an ellipsis).  */
        !           436: 
        !           437: /* On the vax all args are pushed.  */   
        !           438: 
        !           439: #define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) 0
        !           440: 
        !           441: /* This macro generates the assembly code for function entry.
        !           442:    FILE is a stdio stream to output the code to.
        !           443:    SIZE is an int: how many units of temporary storage to allocate.
        !           444:    Refer to the array `regs_ever_live' to determine which registers
        !           445:    to save; `regs_ever_live[I]' is nonzero if register number I
        !           446:    is ever used in the function.  This macro is responsible for
        !           447:    knowing which registers should not be saved even if used.  */
        !           448: 
        !           449: #define FUNCTION_PROLOGUE(FILE, SIZE)     \
        !           450: { register int regno;                                          \
        !           451:   register int mask = 0;                                       \
        !           452:   extern char call_used_regs[];                                        \
        !           453:   for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)      \
        !           454:     if (regs_ever_live[regno] && !call_used_regs[regno])       \
        !           455:        mask |= 1 << regno;                                     \
        !           456:   fprintf (FILE, "\t.word 0x%x\n", mask);                      \
        !           457:   MAYBE_VMS_FUNCTION_PROLOGUE(FILE)                            \
        !           458:   if ((SIZE) >= 64) fprintf (FILE, "\tmovab %d(sp),sp\n", -SIZE);\
        !           459:   else if (SIZE) fprintf (FILE, "\tsubl2 $%d,sp\n", (SIZE)); }
        !           460: 
        !           461: /* vms.h redefines this.  */
        !           462: #define MAYBE_VMS_FUNCTION_PROLOGUE(FILE)
        !           463: 
        !           464: /* Output assembler code to FILE to increment profiler label # LABELNO
        !           465:    for profiling a function entry.  */
        !           466: 
        !           467: #define FUNCTION_PROFILER(FILE, LABELNO)  \
        !           468:    fprintf (FILE, "\tmovab LP%d,r0\n\tjsb mcount\n", (LABELNO));
        !           469: 
        !           470: /* Output assembler code to FILE to initialize this source file's
        !           471:    basic block profiling info, if that has not already been done.  */
        !           472: 
        !           473: #define FUNCTION_BLOCK_PROFILER(FILE, LABELNO)  \
        !           474:   fprintf (FILE, "\ttstl LPBX0\n\tjneq LPI%d\n\tpushal LPBX0\n\tcalls $1,__bb_init_func\nLPI%d:\n",  \
        !           475:           LABELNO, LABELNO);
        !           476: 
        !           477: /* Output assembler code to FILE to increment the entry-count for
        !           478:    the BLOCKNO'th basic block in this source file.  This is a real pain in the
        !           479:    sphincter on a VAX, since we do not want to change any of the bits in the
        !           480:    processor status word.  The way it is done here, it is pushed onto the stack
        !           481:    before any flags have changed, and then the stack is fixed up to account for
        !           482:    the fact that the instruction to restore the flags only reads a word.
        !           483:    It may seem a bit clumsy, but at least it works.
        !           484: */
        !           485: 
        !           486: #define BLOCK_PROFILER(FILE, BLOCKNO)  \
        !           487:   fprintf (FILE, "\tmovpsl -(sp)\n\tmovw (sp),2(sp)\n\taddl2 $2,sp\n\taddl2 $1,LPBX2+%d\n\tbicpsw $255\n\tbispsw (sp)+\n", \
        !           488:                4 * BLOCKNO)
        !           489: 
        !           490: /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
        !           491:    the stack pointer does not matter.  The value is tested only in
        !           492:    functions that have frame pointers.
        !           493:    No definition is equivalent to always zero.  */
        !           494: 
        !           495: #define EXIT_IGNORE_STACK 1
        !           496: 
        !           497: /* This macro generates the assembly code for function exit,
        !           498:    on machines that need it.  If FUNCTION_EPILOGUE is not defined
        !           499:    then individual return instructions are generated for each
        !           500:    return statement.  Args are same as for FUNCTION_PROLOGUE.  */
        !           501: 
        !           502: /* #define FUNCTION_EPILOGUE(FILE, SIZE)  */
        !           503: 
        !           504: /* Store in the variable DEPTH the initial difference between the
        !           505:    frame pointer reg contents and the stack pointer reg contents,
        !           506:    as of the start of the function body.  This depends on the layout
        !           507:    of the fixed parts of the stack frame and on how registers are saved.
        !           508: 
        !           509:    On the Vax, FRAME_POINTER_REQUIRED is always 1, so the definition of this
        !           510:    macro doesn't matter.  But it must be defined.  */
        !           511: 
        !           512: #define INITIAL_FRAME_POINTER_OFFSET(DEPTH) (DEPTH) = 0;
        !           513: 
        !           514: /* Output assembler code for a block containing the constant parts
        !           515:    of a trampoline, leaving space for the variable parts.  */
        !           516: 
        !           517: /* On the vax, the trampoline contains an entry mask and two instructions:
        !           518:      .word NN
        !           519:      movl $STATIC,r0   (store the functions static chain)
        !           520:      jmp  *$FUNCTION   (jump to function code at address FUNCTION)  */
        !           521: 
        !           522: #define TRAMPOLINE_TEMPLATE(FILE)                                      \
        !           523: {                                                                      \
        !           524:   ASM_OUTPUT_SHORT (FILE, const0_rtx);                                 \
        !           525:   ASM_OUTPUT_SHORT (FILE, gen_rtx (CONST_INT, VOIDmode, 0x8fd0));      \
        !           526:   ASM_OUTPUT_INT (FILE, const0_rtx);                                   \
        !           527:   ASM_OUTPUT_BYTE  (FILE, 0x50+STATIC_CHAIN_REGNUM);                   \
        !           528:   ASM_OUTPUT_SHORT (FILE, gen_rtx (CONST_INT, VOIDmode, 0x9f17));      \
        !           529:   ASM_OUTPUT_INT (FILE, const0_rtx);                                   \
        !           530: }
        !           531: 
        !           532: /* Length in units of the trampoline for entering a nested function.  */
        !           533: 
        !           534: #define TRAMPOLINE_SIZE 15
        !           535: 
        !           536: /* Emit RTL insns to initialize the variable parts of a trampoline.
        !           537:    FNADDR is an RTX for the address of the function's pure code.
        !           538:    CXT is an RTX for the static chain value for the function.  */
        !           539: 
        !           540: /* We copy the register-mask from the function's pure code
        !           541:    to the start of the trampoline.  */
        !           542: #define INITIALIZE_TRAMPOLINE(TRAMP, FNADDR, CXT)                      \
        !           543: {                                                                      \
        !           544:   emit_move_insn (gen_rtx (MEM, HImode, TRAMP),                                \
        !           545:                  gen_rtx (MEM, HImode, FNADDR));                       \
        !           546:   emit_move_insn (gen_rtx (MEM, SImode, plus_constant (TRAMP, 4)), CXT);\
        !           547:   emit_move_insn (gen_rtx (MEM, SImode, plus_constant (TRAMP, 11)),    \
        !           548:                  plus_constant (FNADDR, 2));                           \
        !           549: }
        !           550: 
        !           551: /* Addressing modes, and classification of registers for them.  */
        !           552: 
        !           553: #define HAVE_POST_INCREMENT
        !           554: /* #define HAVE_POST_DECREMENT */
        !           555: 
        !           556: #define HAVE_PRE_DECREMENT
        !           557: /* #define HAVE_PRE_INCREMENT */
        !           558: 
        !           559: /* Macros to check register numbers against specific register classes.  */
        !           560: 
        !           561: /* These assume that REGNO is a hard or pseudo reg number.
        !           562:    They give nonzero only if REGNO is a hard reg of the suitable class
        !           563:    or a pseudo reg currently allocated to a suitable hard reg.
        !           564:    Since they use reg_renumber, they are safe only once reg_renumber
        !           565:    has been allocated, which happens in local-alloc.c.  */
        !           566: 
        !           567: #define REGNO_OK_FOR_INDEX_P(regno)  \
        !           568: ((regno) < FIRST_PSEUDO_REGISTER || reg_renumber[regno] >= 0)
        !           569: #define REGNO_OK_FOR_BASE_P(regno) \
        !           570: ((regno) < FIRST_PSEUDO_REGISTER || reg_renumber[regno] >= 0)
        !           571: 
        !           572: /* Maximum number of registers that can appear in a valid memory address.  */
        !           573: 
        !           574: #define MAX_REGS_PER_ADDRESS 2
        !           575: 
        !           576: /* 1 if X is an rtx for a constant that is a valid address.  */
        !           577: 
        !           578: #define CONSTANT_ADDRESS_P(X)   \
        !           579:   (GET_CODE (X) == LABEL_REF || GET_CODE (X) == SYMBOL_REF             \
        !           580:    || GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST               \
        !           581:    || GET_CODE (X) == HIGH)
        !           582: 
        !           583: /* Nonzero if the constant value X is a legitimate general operand.
        !           584:    It is given that X satisfies CONSTANT_P or is a CONST_DOUBLE.  */
        !           585: 
        !           586: #define LEGITIMATE_CONSTANT_P(X) 1
        !           587: 
        !           588: /* The macros REG_OK_FOR..._P assume that the arg is a REG rtx
        !           589:    and check its validity for a certain class.
        !           590:    We have two alternate definitions for each of them.
        !           591:    The usual definition accepts all pseudo regs; the other rejects
        !           592:    them unless they have been allocated suitable hard regs.
        !           593:    The symbol REG_OK_STRICT causes the latter definition to be used.
        !           594: 
        !           595:    Most source files want to accept pseudo regs in the hope that
        !           596:    they will get allocated to the class that the insn wants them to be in.
        !           597:    Source files for reload pass need to be strict.
        !           598:    After reload, it makes no difference, since pseudo regs have
        !           599:    been eliminated by then.  */
        !           600: 
        !           601: #ifndef REG_OK_STRICT
        !           602: 
        !           603: /* Nonzero if X is a hard reg that can be used as an index
        !           604:    or if it is a pseudo reg.  */
        !           605: #define REG_OK_FOR_INDEX_P(X) 1
        !           606: /* Nonzero if X is a hard reg that can be used as a base reg
        !           607:    or if it is a pseudo reg.  */
        !           608: #define REG_OK_FOR_BASE_P(X) 1
        !           609: 
        !           610: #else
        !           611: 
        !           612: /* Nonzero if X is a hard reg that can be used as an index.  */
        !           613: #define REG_OK_FOR_INDEX_P(X) REGNO_OK_FOR_INDEX_P (REGNO (X))
        !           614: /* Nonzero if X is a hard reg that can be used as a base reg.  */
        !           615: #define REG_OK_FOR_BASE_P(X) REGNO_OK_FOR_BASE_P (REGNO (X))
        !           616: 
        !           617: #endif
        !           618: 
        !           619: /* GO_IF_LEGITIMATE_ADDRESS recognizes an RTL expression
        !           620:    that is a valid memory address for an instruction.
        !           621:    The MODE argument is the machine mode for the MEM expression
        !           622:    that wants to use this address.
        !           623: 
        !           624:    The other macros defined here are used only in GO_IF_LEGITIMATE_ADDRESS,
        !           625:    except for CONSTANT_ADDRESS_P which is actually machine-independent.  */
        !           626: 
        !           627: #ifdef NO_EXTERNAL_INDIRECT_ADDRESS
        !           628: 
        !           629: /* Zero if this contains a (CONST (PLUS (SYMBOL_REF) (...))) and the
        !           630:    symbol in the SYMBOL_REF is an external symbol.  */
        !           631: 
        !           632: #define INDIRECTABLE_CONSTANT_P(X) \
        !           633:  (! (GET_CODE ((X)) == CONST                                   \
        !           634:      && GET_CODE (XEXP ((X), 0)) == PLUS                       \
        !           635:      && GET_CODE (XEXP (XEXP ((X), 0), 0)) == SYMBOL_REF       \
        !           636:      && SYMBOL_REF_FLAG (XEXP (XEXP ((X), 0), 0))))
        !           637: 
        !           638: /* Re-definition of CONSTANT_ADDRESS_P, which is true only when there
        !           639:    are no SYMBOL_REFs for external symbols present.  */
        !           640: 
        !           641: #define INDIRECTABLE_CONSTANT_ADDRESS_P(X)                             \
        !           642:   (GET_CODE (X) == LABEL_REF                                           \
        !           643:    || (GET_CODE (X) == SYMBOL_REF && !SYMBOL_REF_FLAG (X))             \
        !           644:    || (GET_CODE (X) == CONST && INDIRECTABLE_CONSTANT_P(X))            \
        !           645:    || GET_CODE (X) == CONST_INT)
        !           646: 
        !           647: 
        !           648: /* Non-zero if X is an address which can be indirected.  External symbols
        !           649:    could be in a sharable image library, so we disallow those.  */
        !           650: 
        !           651: #define INDIRECTABLE_ADDRESS_P(X)  \
        !           652:   (INDIRECTABLE_CONSTANT_ADDRESS_P (X)                                         \
        !           653:    || (GET_CODE (X) == REG && REG_OK_FOR_BASE_P (X))                   \
        !           654:    || (GET_CODE (X) == PLUS                                            \
        !           655:        && GET_CODE (XEXP (X, 0)) == REG                                        \
        !           656:        && REG_OK_FOR_BASE_P (XEXP (X, 0))                              \
        !           657:        && INDIRECTABLE_CONSTANT_ADDRESS_P (XEXP (X, 1))))
        !           658: 
        !           659: #else /* not NO_EXTERNAL_INDIRECT_ADDRESS */
        !           660: 
        !           661: #define INDIRECTABLE_CONSTANT_ADDRESS_P(X) CONSTANT_ADDRESS_P(X)
        !           662: 
        !           663: /* Non-zero if X is an address which can be indirected.  */
        !           664: #define INDIRECTABLE_ADDRESS_P(X)  \
        !           665:   (CONSTANT_ADDRESS_P (X)                                              \
        !           666:    || (GET_CODE (X) == REG && REG_OK_FOR_BASE_P (X))                   \
        !           667:    || (GET_CODE (X) == PLUS                                            \
        !           668:        && GET_CODE (XEXP (X, 0)) == REG                                        \
        !           669:        && REG_OK_FOR_BASE_P (XEXP (X, 0))                              \
        !           670:        && CONSTANT_ADDRESS_P (XEXP (X, 1))))
        !           671: 
        !           672: #endif /* not NO_EXTERNAL_INDIRECT_ADDRESS */
        !           673: 
        !           674: /* Go to ADDR if X is a valid address not using indexing.
        !           675:    (This much is the easy part.)  */
        !           676: #define GO_IF_NONINDEXED_ADDRESS(X, ADDR)  \
        !           677: { register rtx xfoob = (X);                                            \
        !           678:   if (GET_CODE (xfoob) == REG) goto ADDR;                              \
        !           679:   if (CONSTANT_ADDRESS_P (xfoob)) goto ADDR;                           \
        !           680:   if (INDIRECTABLE_ADDRESS_P (xfoob)) goto ADDR;                       \
        !           681:   xfoob = XEXP (X, 0);                                                 \
        !           682:   if (GET_CODE (X) == MEM && INDIRECTABLE_ADDRESS_P (xfoob))           \
        !           683:     goto ADDR;                                                         \
        !           684:   if ((GET_CODE (X) == PRE_DEC || GET_CODE (X) == POST_INC)            \
        !           685:       && GET_CODE (xfoob) == REG && REG_OK_FOR_BASE_P (xfoob))         \
        !           686:     goto ADDR; }
        !           687: 
        !           688: /* 1 if PROD is either a reg times size of mode MODE
        !           689:    or just a reg, if MODE is just one byte.
        !           690:    This macro's expansion uses the temporary variables xfoo0 and xfoo1
        !           691:    that must be declared in the surrounding context.  */
        !           692: #define INDEX_TERM_P(PROD, MODE)   \
        !           693: (GET_MODE_SIZE (MODE) == 1                                             \
        !           694:  ? (GET_CODE (PROD) == REG && REG_OK_FOR_BASE_P (PROD))                        \
        !           695:  : (GET_CODE (PROD) == MULT                                            \
        !           696:     &&                                                                 \
        !           697:     (xfoo0 = XEXP (PROD, 0), xfoo1 = XEXP (PROD, 1),                   \
        !           698:      ((GET_CODE (xfoo0) == CONST_INT                                   \
        !           699:        && INTVAL (xfoo0) == GET_MODE_SIZE (MODE)                       \
        !           700:        && GET_CODE (xfoo1) == REG                                      \
        !           701:        && REG_OK_FOR_INDEX_P (xfoo1))                                  \
        !           702:       ||                                                               \
        !           703:       (GET_CODE (xfoo1) == CONST_INT                                   \
        !           704:        && INTVAL (xfoo1) == GET_MODE_SIZE (MODE)                       \
        !           705:        && GET_CODE (xfoo0) == REG                                      \
        !           706:        && REG_OK_FOR_INDEX_P (xfoo0))))))
        !           707: 
        !           708: /* Go to ADDR if X is the sum of a register
        !           709:    and a valid index term for mode MODE.  */
        !           710: #define GO_IF_REG_PLUS_INDEX(X, MODE, ADDR)    \
        !           711: { register rtx xfooa;                                                  \
        !           712:   if (GET_CODE (X) == PLUS)                                            \
        !           713:     { if (GET_CODE (XEXP (X, 0)) == REG                                        \
        !           714:          && REG_OK_FOR_BASE_P (XEXP (X, 0))                            \
        !           715:          && (xfooa = XEXP (X, 1),                                      \
        !           716:              INDEX_TERM_P (xfooa, MODE)))                              \
        !           717:        goto ADDR;                                                      \
        !           718:       if (GET_CODE (XEXP (X, 1)) == REG                                        \
        !           719:          && REG_OK_FOR_BASE_P (XEXP (X, 1))                            \
        !           720:          && (xfooa = XEXP (X, 0),                                      \
        !           721:              INDEX_TERM_P (xfooa, MODE)))                              \
        !           722:        goto ADDR; } }
        !           723: 
        !           724: #define GO_IF_LEGITIMATE_ADDRESS(MODE, X, ADDR)  \
        !           725: { register rtx xfoo, xfoo0, xfoo1;                                     \
        !           726:   GO_IF_NONINDEXED_ADDRESS (X, ADDR);                                  \
        !           727:   if (GET_CODE (X) == PLUS)                                            \
        !           728:     { /* Handle <address>[index] represented with index-sum outermost */\
        !           729:       xfoo = XEXP (X, 0);                                              \
        !           730:       if (INDEX_TERM_P (xfoo, MODE))                                   \
        !           731:        { GO_IF_NONINDEXED_ADDRESS (XEXP (X, 1), ADDR); }               \
        !           732:       xfoo = XEXP (X, 1);                                              \
        !           733:       if (INDEX_TERM_P (xfoo, MODE))                                   \
        !           734:        { GO_IF_NONINDEXED_ADDRESS (XEXP (X, 0), ADDR); }               \
        !           735:       /* Handle offset(reg)[index] with offset added outermost */      \
        !           736:       if (INDIRECTABLE_CONSTANT_ADDRESS_P (XEXP (X, 0)))               \
        !           737:        { if (GET_CODE (XEXP (X, 1)) == REG                             \
        !           738:              && REG_OK_FOR_BASE_P (XEXP (X, 1)))                       \
        !           739:            goto ADDR;                                                  \
        !           740:          GO_IF_REG_PLUS_INDEX (XEXP (X, 1), MODE, ADDR); }             \
        !           741:       if (INDIRECTABLE_CONSTANT_ADDRESS_P (XEXP (X, 1)))               \
        !           742:        { if (GET_CODE (XEXP (X, 0)) == REG                             \
        !           743:              && REG_OK_FOR_BASE_P (XEXP (X, 0)))                       \
        !           744:            goto ADDR;                                                  \
        !           745:          GO_IF_REG_PLUS_INDEX (XEXP (X, 0), MODE, ADDR); } } }
        !           746: 
        !           747: /* Try machine-dependent ways of modifying an illegitimate address
        !           748:    to be legitimate.  If we find one, return the new, valid address.
        !           749:    This macro is used in only one place: `memory_address' in explow.c.
        !           750: 
        !           751:    OLDX is the address as it was before break_out_memory_refs was called.
        !           752:    In some cases it is useful to look at this to decide what needs to be done.
        !           753: 
        !           754:    MODE and WIN are passed so that this macro can use
        !           755:    GO_IF_LEGITIMATE_ADDRESS.
        !           756: 
        !           757:    It is always safe for this macro to do nothing.  It exists to recognize
        !           758:    opportunities to optimize the output.
        !           759: 
        !           760:    For the vax, nothing needs to be done.  */
        !           761: 
        !           762: #define LEGITIMIZE_ADDRESS(X,OLDX,MODE,WIN)  {}
        !           763: 
        !           764: /* Go to LABEL if ADDR (a legitimate address expression)
        !           765:    has an effect that depends on the machine mode it is used for.
        !           766:    On the VAX, the predecrement and postincrement address depend thus
        !           767:    (the amount of decrement or increment being the length of the operand)
        !           768:    and all indexed address depend thus (because the index scale factor
        !           769:    is the length of the operand).  */
        !           770: #define GO_IF_MODE_DEPENDENT_ADDRESS(ADDR,LABEL)       \
        !           771:  { if (GET_CODE (ADDR) == POST_INC || GET_CODE (ADDR) == PRE_DEC)      \
        !           772:      goto LABEL;                                                       \
        !           773:    if (GET_CODE (ADDR) == PLUS)                                                \
        !           774:      { if (CONSTANT_ADDRESS_P (XEXP (ADDR, 0))                         \
        !           775:           && GET_CODE (XEXP (ADDR, 1)) == REG);                        \
        !           776:        else if (CONSTANT_ADDRESS_P (XEXP (ADDR, 1))                    \
        !           777:                && GET_CODE (XEXP (ADDR, 0)) == REG);                   \
        !           778:        else goto LABEL; }}
        !           779: 
        !           780: /* Specify the machine mode that this machine uses
        !           781:    for the index in the tablejump instruction.  */
        !           782: #define CASE_VECTOR_MODE HImode
        !           783: 
        !           784: /* Define this if the case instruction expects the table
        !           785:    to contain offsets from the address of the table.
        !           786:    Do not define this if the table should contain absolute addresses.  */
        !           787: #define CASE_VECTOR_PC_RELATIVE
        !           788: 
        !           789: /* Define this if the case instruction drops through after the table
        !           790:    when the index is out of range.  Don't define it if the case insn
        !           791:    jumps to the default label instead.  */
        !           792: #define CASE_DROPS_THROUGH
        !           793: 
        !           794: /* Specify the tree operation to be used to convert reals to integers.  */
        !           795: #define IMPLICIT_FIX_EXPR FIX_ROUND_EXPR
        !           796: 
        !           797: /* This is the kind of divide that is easiest to do in the general case.  */
        !           798: #define EASY_DIV_EXPR TRUNC_DIV_EXPR
        !           799: 
        !           800: /* Define this as 1 if `char' should by default be signed; else as 0.  */
        !           801: #define DEFAULT_SIGNED_CHAR 1
        !           802: 
        !           803: /* This flag, if defined, says the same insns that convert to a signed fixnum
        !           804:    also convert validly to an unsigned one.  */
        !           805: #define FIXUNS_TRUNC_LIKE_FIX_TRUNC
        !           806: 
        !           807: /* Max number of bytes we can move from memory to memory
        !           808:    in one reasonably fast instruction.  */
        !           809: #define MOVE_MAX 8
        !           810: 
        !           811: /* Define this if zero-extension is slow (more than one real instruction).  */
        !           812: /* #define SLOW_ZERO_EXTEND */
        !           813: 
        !           814: /* Nonzero if access to memory by bytes is slow and undesirable.  */
        !           815: #define SLOW_BYTE_ACCESS 0
        !           816: 
        !           817: /* Define if shifts truncate the shift count
        !           818:    which implies one can omit a sign-extension or zero-extension
        !           819:    of a shift count.  */
        !           820: /* #define SHIFT_COUNT_TRUNCATED */
        !           821: 
        !           822: /* Value is 1 if truncating an integer of INPREC bits to OUTPREC bits
        !           823:    is done just by pretending it is already truncated.  */
        !           824: #define TRULY_NOOP_TRUNCATION(OUTPREC, INPREC) 1
        !           825: 
        !           826: /* Specify the machine mode that pointers have.
        !           827:    After generation of rtl, the compiler makes no further distinction
        !           828:    between pointers and any other objects of this machine mode.  */
        !           829: #define Pmode SImode
        !           830: 
        !           831: /* A function address in a call instruction
        !           832:    is a byte address (for indexing purposes)
        !           833:    so give the MEM rtx a byte's mode.  */
        !           834: #define FUNCTION_MODE QImode
        !           835: 
        !           836: /* This machine doesn't use IEEE floats.  */
        !           837: 
        !           838: #define TARGET_FLOAT_FORMAT VAX_FLOAT_FORMAT
        !           839: 
        !           840: /* Compute the cost of computing a constant rtl expression RTX
        !           841:    whose rtx-code is CODE.  The body of this macro is a portion
        !           842:    of a switch statement.  If the code is computed here,
        !           843:    return it with a return statement.  Otherwise, break from the switch.  */
        !           844: 
        !           845: /* On a VAX, constants from 0..63 are cheap because they can use the
        !           846:    1 byte literal constant format.  compare to -1 should be made cheap
        !           847:    so that decrement-and-branch insns can be formed more easily (if
        !           848:    the value -1 is copied to a register some decrement-and-branch patterns
        !           849:    will not match).  */
        !           850: 
        !           851: #define CONST_COSTS(RTX,CODE,OUTER_CODE) \
        !           852:   case CONST_INT:                                              \
        !           853:     if (INTVAL (RTX) == 0) return 0;                           \
        !           854:     if ((OUTER_CODE) == AND)                                   \
        !           855:       return ((unsigned) ~INTVAL (RTX) <= 077) ? 1 : 2;                \
        !           856:     if ((unsigned) INTVAL (RTX) <= 077) return 1;              \
        !           857:     if ((OUTER_CODE) == COMPARE && INTVAL (RTX) == -1)         \
        !           858:       return 1;                                                        \
        !           859:     if ((OUTER_CODE) == PLUS && (unsigned) -INTVAL (RTX) <= 077)\
        !           860:       return 1;                                                        \
        !           861:   case CONST:                                                  \
        !           862:   case LABEL_REF:                                              \
        !           863:   case SYMBOL_REF:                                             \
        !           864:     return 3;                                                  \
        !           865:   case CONST_DOUBLE:                                           \
        !           866:     if (GET_MODE_CLASS (GET_MODE (RTX)) == MODE_FLOAT)         \
        !           867:       return vax_float_literal (RTX) ? 5 : 8;                  \
        !           868:     else                                                       \
        !           869:       return (((CONST_DOUBLE_HIGH (RTX) == 0                   \
        !           870:                && (unsigned) CONST_DOUBLE_LOW (RTX) < 64)      \
        !           871:               || ((OUTER_CODE) == PLUS                         \
        !           872:                   && CONST_DOUBLE_HIGH (RTX) == -1             \
        !           873:                   && (unsigned)-CONST_DOUBLE_LOW (RTX) < 64))  \
        !           874:              ? 2 : 5);
        !           875: 
        !           876: #define RTX_COSTS(RTX,CODE,OUTER_CODE) case FIX: case FLOAT:   \
        !           877:  case MULT: case DIV: case UDIV: case MOD: case UMOD:          \
        !           878:  case LSHIFT: case ASHIFT: case LSHIFTRT: case ASHIFTRT:       \
        !           879:  case ROTATE: case ROTATERT: case PLUS: case MINUS: case IOR:  \
        !           880:  case XOR: case AND: case NEG: case NOT: case ZERO_EXTRACT:    \
        !           881:  case SIGN_EXTRACT: case MEM: return vax_rtx_cost(RTX)
        !           882: 
        !           883: #define        ADDRESS_COST(RTX) (1 + (GET_CODE (RTX) == REG ? 0 : vax_address_cost(RTX)))
        !           884: 
        !           885: /* Specify the cost of a branch insn; roughly the number of extra insns that
        !           886:    should be added to avoid a branch.
        !           887: 
        !           888:    Branches are extremely cheap on the VAX while the shift insns often
        !           889:    used to replace branches can be expensive.  */
        !           890: 
        !           891: #define BRANCH_COST 0
        !           892: 
        !           893: /*
        !           894:  * We can use the BSD C library routines for the libgcc calls that are
        !           895:  * still generated, since that's what they boil down to anyways.
        !           896:  */
        !           897: 
        !           898: #define UDIVSI3_LIBCALL "*udiv"
        !           899: #define UMODSI3_LIBCALL "*urem"
        !           900: 
        !           901: /* Check a `double' value for validity for a particular machine mode.  */
        !           902: 
        !           903: /* note that it is very hard to accidentally create a number that fits in a
        !           904:    double but not in a float, since their ranges are almost the same */
        !           905: 
        !           906: #define CHECK_FLOAT_VALUE(mode, d) (check_float_value (mode, &d))
        !           907: 
        !           908: /* For future reference:
        !           909:    D Float: 9 bit, sign magnitude, excess 128 binary exponent
        !           910:             normalized 56 bit fraction, redundant bit not represented
        !           911:             approximately 16 decimal digits of precision
        !           912: 
        !           913:    The values to use if we trust decimal to binary conversions:
        !           914: #define MAX_D_FLOAT 1.7014118346046923e+38
        !           915: #define MIN_D_FLOAT .29387358770557188e-38
        !           916: 
        !           917:    G float: 12 bit, sign magnitude, excess 1024 binary exponent
        !           918:             normalized 53 bit fraction, redundant bit not represented
        !           919:             approximately 15 decimal digits precision
        !           920: 
        !           921:    The values to use if we trust decimal to binary conversions:
        !           922: #define MAX_G_FLOAT .898846567431157e+308
        !           923: #define MIN_G_FLOAT .556268464626800e-308
        !           924: */
        !           925: 
        !           926: /* Tell final.c how to eliminate redundant test instructions.  */
        !           927: 
        !           928: /* Here we define machine-dependent flags and fields in cc_status
        !           929:    (see `conditions.h').  No extra ones are needed for the vax.  */
        !           930: 
        !           931: /* Store in cc_status the expressions
        !           932:    that the condition codes will describe
        !           933:    after execution of an instruction whose pattern is EXP.
        !           934:    Do not alter them if the instruction would not alter the cc's.  */
        !           935: 
        !           936: #define NOTICE_UPDATE_CC(EXP, INSN) \
        !           937: { if (GET_CODE (EXP) == SET)                                   \
        !           938:     { if (GET_CODE (SET_SRC (EXP)) == CALL)                    \
        !           939:        CC_STATUS_INIT;                                         \
        !           940:       else if (GET_CODE (SET_DEST (EXP)) != PC)                        \
        !           941:        { cc_status.flags = 0;                                  \
        !           942:          cc_status.value1 = SET_DEST (EXP);                    \
        !           943:          cc_status.value2 = SET_SRC (EXP); } }                 \
        !           944:   else if (GET_CODE (EXP) == PARALLEL                          \
        !           945:           && GET_CODE (XVECEXP (EXP, 0, 0)) == SET)            \
        !           946:     {                                                          \
        !           947:       if (GET_CODE (SET_SRC (XVECEXP (EXP, 0, 0))) == CALL)    \
        !           948:        CC_STATUS_INIT;                                         \
        !           949:       else if (GET_CODE (SET_DEST (XVECEXP (EXP, 0, 0))) != PC) \
        !           950:        { cc_status.flags = 0;                                  \
        !           951:          cc_status.value1 = SET_DEST (XVECEXP (EXP, 0, 0));    \
        !           952:          cc_status.value2 = SET_SRC (XVECEXP (EXP, 0, 0)); } } \
        !           953:   /* PARALLELs whose first element sets the PC are aob, sob insns.     \
        !           954:      They do change the cc's.  So drop through and forget the cc's.  */ \
        !           955:   else CC_STATUS_INIT;                                         \
        !           956:   if (cc_status.value1 && GET_CODE (cc_status.value1) == REG   \
        !           957:       && cc_status.value2                                      \
        !           958:       && reg_overlap_mentioned_p (cc_status.value1, cc_status.value2)) \
        !           959:     cc_status.value2 = 0;                                      \
        !           960:   if (cc_status.value1 && GET_CODE (cc_status.value1) == MEM   \
        !           961:       && cc_status.value2                                      \
        !           962:       && GET_CODE (cc_status.value2) == MEM)                   \
        !           963:     cc_status.value2 = 0; }
        !           964: /* Actual condition, one line up, should be that value2's address
        !           965:    depends on value1, but that is too much of a pain.  */
        !           966: 
        !           967: #define OUTPUT_JUMP(NORMAL, FLOAT, NO_OV)  \
        !           968: { if (cc_status.flags & CC_NO_OVERFLOW)                                \
        !           969:     return NO_OV;                                              \
        !           970:   return NORMAL; }
        !           971: 
        !           972: /* Control the assembler format that we output.  */
        !           973: 
        !           974: /* Output at beginning of assembler file.  */
        !           975: 
        !           976: #define ASM_FILE_START(FILE) fprintf (FILE, "#NO_APP\n");
        !           977: 
        !           978: /* Output to assembler file text saying following lines
        !           979:    may contain character constants, extra white space, comments, etc.  */
        !           980: 
        !           981: #define ASM_APP_ON "#APP\n"
        !           982: 
        !           983: /* Output to assembler file text saying following lines
        !           984:    no longer contain unusual constructs.  */
        !           985: 
        !           986: #define ASM_APP_OFF "#NO_APP\n"
        !           987: 
        !           988: /* Output before read-only data.  */
        !           989: 
        !           990: #define TEXT_SECTION_ASM_OP ".text"
        !           991: 
        !           992: /* Output before writable data.  */
        !           993: 
        !           994: #define DATA_SECTION_ASM_OP ".data"
        !           995: 
        !           996: /* How to refer to registers in assembler output.
        !           997:    This sequence is indexed by compiler's hard-register-number (see above).  */
        !           998: 
        !           999: #define REGISTER_NAMES \
        !          1000: {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", \
        !          1001:  "r9", "r10", "r11", "ap", "fp", "sp", "pc"}
        !          1002: 
        !          1003: /* This is BSD, so it wants DBX format.  */
        !          1004: 
        !          1005: #define DBX_DEBUGGING_INFO
        !          1006: 
        !          1007: /* How to renumber registers for dbx and gdb.
        !          1008:    Vax needs no change in the numeration.  */
        !          1009: 
        !          1010: #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
        !          1011: 
        !          1012: /* Do not break .stabs pseudos into continuations.  */
        !          1013: 
        !          1014: #define DBX_CONTIN_LENGTH 0
        !          1015: 
        !          1016: /* This is the char to use for continuation (in case we need to turn
        !          1017:    continuation back on).  */
        !          1018: 
        !          1019: #define DBX_CONTIN_CHAR '?'
        !          1020: 
        !          1021: /* Don't use the `xsfoo;' construct in DBX output; this system
        !          1022:    doesn't support it.  */
        !          1023: 
        !          1024: #define DBX_NO_XREFS
        !          1025: 
        !          1026: /* Output the .stabs for a C `static' variable in the data section.  */
        !          1027: #define DBX_STATIC_STAB_DATA_SECTION
        !          1028: 
        !          1029: /* Vax specific: which type character is used for type double?  */
        !          1030: 
        !          1031: #define ASM_DOUBLE_CHAR (TARGET_G_FLOAT ? 'g' : 'd')
        !          1032: 
        !          1033: /* This is how to output the definition of a user-level label named NAME,
        !          1034:    such as the label on a static function or variable NAME.  */
        !          1035: 
        !          1036: #define ASM_OUTPUT_LABEL(FILE,NAME)    \
        !          1037:   do { assemble_name (FILE, NAME); fputs (":\n", FILE); } while (0)
        !          1038: 
        !          1039: /* This is how to output a command to make the user-level label named NAME
        !          1040:    defined for reference from other files.  */
        !          1041: 
        !          1042: #define ASM_GLOBALIZE_LABEL(FILE,NAME) \
        !          1043:   do { fputs (".globl ", FILE); assemble_name (FILE, NAME); fputs ("\n", FILE);} while (0)
        !          1044: 
        !          1045: /* This is how to output a reference to a user-level label named NAME.  */
        !          1046: 
        !          1047: #define ASM_OUTPUT_LABELREF(FILE,NAME) \
        !          1048:   fprintf (FILE, "_%s", NAME)
        !          1049: 
        !          1050: /* This is how to output an internal numbered label where
        !          1051:    PREFIX is the class of label and NUM is the number within the class.  */
        !          1052: 
        !          1053: #define ASM_OUTPUT_INTERNAL_LABEL(FILE,PREFIX,NUM)     \
        !          1054:   fprintf (FILE, "%s%d:\n", PREFIX, NUM)
        !          1055: 
        !          1056: /* This is how to store into the string LABEL
        !          1057:    the symbol_ref name of an internal numbered label where
        !          1058:    PREFIX is the class of label and NUM is the number within the class.
        !          1059:    This is suitable for output with `assemble_name'.  */
        !          1060: 
        !          1061: #define ASM_GENERATE_INTERNAL_LABEL(LABEL,PREFIX,NUM)  \
        !          1062:   sprintf (LABEL, "*%s%d", PREFIX, NUM)
        !          1063: 
        !          1064: /* This is how to output an assembler line defining a `double' constant.
        !          1065:    It is .dfloat or .gfloat, depending.  */
        !          1066: 
        !          1067: #define ASM_OUTPUT_DOUBLE(FILE,VALUE)  \
        !          1068: do { char dstr[30];                                                    \
        !          1069:      REAL_VALUE_TO_DECIMAL (VALUE, "%.20e", dstr);                     \
        !          1070:      fprintf (FILE, "\t.%cfloat 0%c%s\n", ASM_DOUBLE_CHAR,             \
        !          1071:                                          ASM_DOUBLE_CHAR, dstr);       \
        !          1072:    } while (0);
        !          1073: 
        !          1074: /* This is how to output an assembler line defining a `float' constant.  */
        !          1075: 
        !          1076: #define ASM_OUTPUT_FLOAT(FILE,VALUE)  \
        !          1077:   do { char dstr[30];                                          \
        !          1078:        REAL_VALUE_TO_DECIMAL (VALUE, "%.20e", dstr);           \
        !          1079:        fprintf (FILE, "\t.float 0f%s\n", dstr); } while (0);
        !          1080: 
        !          1081: /* This is how to output an assembler line defining an `int' constant.  */
        !          1082: 
        !          1083: #define ASM_OUTPUT_INT(FILE,VALUE)  \
        !          1084: ( fprintf (FILE, "\t.long "),                  \
        !          1085:   output_addr_const (FILE, (VALUE)),           \
        !          1086:   fprintf (FILE, "\n"))
        !          1087: 
        !          1088: /* Likewise for `char' and `short' constants.  */
        !          1089: 
        !          1090: #define ASM_OUTPUT_SHORT(FILE,VALUE)  \
        !          1091: ( fprintf (FILE, "\t.word "),                  \
        !          1092:   output_addr_const (FILE, (VALUE)),           \
        !          1093:   fprintf (FILE, "\n"))
        !          1094: 
        !          1095: #define ASM_OUTPUT_CHAR(FILE,VALUE)  \
        !          1096: ( fprintf (FILE, "\t.byte "),                  \
        !          1097:   output_addr_const (FILE, (VALUE)),           \
        !          1098:   fprintf (FILE, "\n"))
        !          1099: 
        !          1100: /* This is how to output an assembler line for a numeric constant byte.  */
        !          1101: 
        !          1102: #define ASM_OUTPUT_BYTE(FILE,VALUE)  \
        !          1103:   fprintf (FILE, "\t.byte 0x%x\n", (VALUE))
        !          1104: 
        !          1105: /* This is how to output an insn to push a register on the stack.
        !          1106:    It need not be very fast code.  */
        !          1107: 
        !          1108: #define ASM_OUTPUT_REG_PUSH(FILE,REGNO)  \
        !          1109:   fprintf (FILE, "\tpushl %s\n", reg_names[REGNO])
        !          1110: 
        !          1111: /* This is how to output an insn to pop a register from the stack.
        !          1112:    It need not be very fast code.  */
        !          1113: 
        !          1114: #define ASM_OUTPUT_REG_POP(FILE,REGNO)  \
        !          1115:   fprintf (FILE, "\tmovl (sp)+,%s\n", reg_names[REGNO])
        !          1116: 
        !          1117: /* This is how to output an element of a case-vector that is absolute.
        !          1118:    (The Vax does not use such vectors,
        !          1119:    but we must define this macro anyway.)  */
        !          1120: 
        !          1121: #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
        !          1122:   fprintf (FILE, "\t.long L%d\n", VALUE)
        !          1123: 
        !          1124: /* This is how to output an element of a case-vector that is relative.  */
        !          1125: 
        !          1126: #define ASM_OUTPUT_ADDR_DIFF_ELT(FILE, VALUE, REL)  \
        !          1127:   fprintf (FILE, "\t.word L%d-L%d\n", VALUE, REL)
        !          1128: 
        !          1129: /* This is how to output an assembler line
        !          1130:    that says to advance the location counter
        !          1131:    to a multiple of 2**LOG bytes.  */
        !          1132: 
        !          1133: #define ASM_OUTPUT_ALIGN(FILE,LOG)  \
        !          1134:   fprintf (FILE, "\t.align %d\n", (LOG))
        !          1135: 
        !          1136: /* This is how to output an assembler line
        !          1137:    that says to advance the location counter by SIZE bytes.  */
        !          1138: 
        !          1139: #define ASM_OUTPUT_SKIP(FILE,SIZE)  \
        !          1140:   fprintf (FILE, "\t.space %u\n", (SIZE))
        !          1141: 
        !          1142: /* This says how to output an assembler line
        !          1143:    to define a global common symbol.  */
        !          1144: 
        !          1145: #define ASM_OUTPUT_COMMON(FILE, NAME, SIZE, ROUNDED)  \
        !          1146: ( fputs (".comm ", (FILE)),                    \
        !          1147:   assemble_name ((FILE), (NAME)),              \
        !          1148:   fprintf ((FILE), ",%u\n", (ROUNDED)))
        !          1149: 
        !          1150: /* This says how to output an assembler line
        !          1151:    to define a local common symbol.  */
        !          1152: 
        !          1153: #define ASM_OUTPUT_LOCAL(FILE, NAME, SIZE, ROUNDED)  \
        !          1154: ( fputs (".lcomm ", (FILE)),                   \
        !          1155:   assemble_name ((FILE), (NAME)),              \
        !          1156:   fprintf ((FILE), ",%u\n", (ROUNDED)))
        !          1157: 
        !          1158: /* Store in OUTPUT a string (made with alloca) containing
        !          1159:    an assembler-name for a local static variable named NAME.
        !          1160:    LABELNO is an integer which is different for each call.  */
        !          1161: 
        !          1162: #define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO) \
        !          1163: ( (OUTPUT) = (char *) alloca (strlen ((NAME)) + 10),   \
        !          1164:   sprintf ((OUTPUT), "%s.%d", (NAME), (LABELNO)))
        !          1165: 
        !          1166: /* Define the parentheses used to group arithmetic operations
        !          1167:    in assembler code.  */
        !          1168: 
        !          1169: #define ASM_OPEN_PAREN "("
        !          1170: #define ASM_CLOSE_PAREN ")"
        !          1171: 
        !          1172: /* Define results of standard character escape sequences.  */
        !          1173: #define TARGET_BELL 007
        !          1174: #define TARGET_BS 010
        !          1175: #define TARGET_TAB 011
        !          1176: #define TARGET_NEWLINE 012
        !          1177: #define TARGET_VT 013
        !          1178: #define TARGET_FF 014
        !          1179: #define TARGET_CR 015
        !          1180: 
        !          1181: /* Print an instruction operand X on file FILE.
        !          1182:    CODE is the code from the %-spec that requested printing this operand;
        !          1183:    if `%z3' was used to print operand 3, then CODE is 'z'.
        !          1184: 
        !          1185: VAX operand formatting codes:
        !          1186: 
        !          1187:  letter           print
        !          1188:    C   reverse branch condition
        !          1189:    D   64-bit immediate operand
        !          1190:    B   the low 8 bits of the complement of a constant operand
        !          1191:    H   the low 16 bits of the complement of a constant operand
        !          1192:    M   a mask for the N highest bits of a word
        !          1193:    N   the complement of a constant integer operand
        !          1194:    P   constant operand plus 1
        !          1195:    R   32 - constant operand
        !          1196:    b   the low 8 bits of a negated constant operand
        !          1197:    h   the low 16 bits of a negated constant operand
        !          1198:    #   'd' or 'g' depending on whether dfloat or gfloat is used  */
        !          1199: 
        !          1200: /* The purpose of D is to get around a quirk or bug in vax assembler
        !          1201:    whereby -1 in a 64-bit immediate operand means 0x00000000ffffffff,
        !          1202:    which is not a 64-bit minus one.  */
        !          1203: 
        !          1204: #define PRINT_OPERAND_PUNCT_VALID_P(CODE)                              \
        !          1205:   ((CODE) == '#')
        !          1206: 
        !          1207: #define PRINT_OPERAND(FILE, X, CODE)  \
        !          1208: { extern char *rev_cond_name ();                                       \
        !          1209:   if (CODE == '#') fputc (ASM_DOUBLE_CHAR, FILE);                      \
        !          1210:   else if (CODE == 'C')                                                        \
        !          1211:     fputs (rev_cond_name (X), FILE);                                   \
        !          1212:   else if (CODE == 'D' && GET_CODE (X) == CONST_INT && INTVAL (X) < 0) \
        !          1213:     fprintf (FILE, "$0xffffffff%08x", INTVAL (X));                     \
        !          1214:   else if (CODE == 'P' && GET_CODE (X) == CONST_INT)                   \
        !          1215:     fprintf (FILE, "$%d", INTVAL (X) + 1);                             \
        !          1216:   else if (CODE == 'N' && GET_CODE (X) == CONST_INT)                   \
        !          1217:     fprintf (FILE, "$%d", ~ INTVAL (X));                               \
        !          1218:   /* rotl instruction cannot deal with negative arguments.  */         \
        !          1219:   else if (CODE == 'R' && GET_CODE (X) == CONST_INT)                   \
        !          1220:     fprintf (FILE, "$%d", 32 - INTVAL (X));                            \
        !          1221:   else if (CODE == 'H' && GET_CODE (X) == CONST_INT)                   \
        !          1222:     fprintf (FILE, "$%d", 0xffff & ~ INTVAL (X));                      \
        !          1223:   else if (CODE == 'h' && GET_CODE (X) == CONST_INT)                   \
        !          1224:     fprintf (FILE, "$%d", (short) - INTVAL (x));                       \
        !          1225:   else if (CODE == 'B' && GET_CODE (X) == CONST_INT)                   \
        !          1226:     fprintf (FILE, "$%d", 0xff & ~ INTVAL (X));                                \
        !          1227:   else if (CODE == 'b' && GET_CODE (X) == CONST_INT)                   \
        !          1228:     fprintf (FILE, "$%d", 0xff & - INTVAL (X));                                \
        !          1229:   else if (CODE == 'M' && GET_CODE (X) == CONST_INT)                   \
        !          1230:     fprintf (FILE, "$%d", ~((1 << INTVAL (x)) - 1));                   \
        !          1231:   else if (GET_CODE (X) == REG)                                                \
        !          1232:     fprintf (FILE, "%s", reg_names[REGNO (X)]);                                \
        !          1233:   else if (GET_CODE (X) == MEM)                                                \
        !          1234:     output_address (XEXP (X, 0));                                      \
        !          1235:   else if (GET_CODE (X) == CONST_DOUBLE && GET_MODE (X) == SFmode)     \
        !          1236:     { REAL_VALUE_TYPE r; char dstr[30];                                        \
        !          1237:       REAL_VALUE_FROM_CONST_DOUBLE (r, X);                             \
        !          1238:       REAL_VALUE_TO_DECIMAL (r, "%.20e", dstr);                                \
        !          1239:       fprintf (FILE, "$0f%s", dstr); }                                 \
        !          1240:   else if (GET_CODE (X) == CONST_DOUBLE && GET_MODE (X) == DFmode)     \
        !          1241:     { REAL_VALUE_TYPE r; char dstr[30];                                        \
        !          1242:       REAL_VALUE_FROM_CONST_DOUBLE (r, X);                             \
        !          1243:       REAL_VALUE_TO_DECIMAL (r, "%.20e", dstr);                                \
        !          1244:       fprintf (FILE, "$0%c%s", ASM_DOUBLE_CHAR, dstr); }               \
        !          1245:   else { putc ('$', FILE); output_addr_const (FILE, X); }}
        !          1246: 
        !          1247: /* Print a memory operand whose address is X, on file FILE.
        !          1248:    This uses a function in output-vax.c.  */
        !          1249: 
        !          1250: #define PRINT_OPERAND_ADDRESS(FILE, ADDR)  \
        !          1251:  print_operand_address (FILE, ADDR)

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