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Annotation of gcc/config/rs6000/rs6000.c, revision 1.1

1.1     ! root        1: /* Subroutines used for code generation on IBM RS/6000.
        !             2:    Copyright (C) 1991, 1993 Free Software Foundation, Inc.
        !             3:    Contributed by Richard Kenner ([email protected])
        !             4: 
        !             5: This file is part of GNU CC.
        !             6: 
        !             7: GNU CC is free software; you can redistribute it and/or modify
        !             8: it under the terms of the GNU General Public License as published by
        !             9: the Free Software Foundation; either version 2, or (at your option)
        !            10: any later version.
        !            11: 
        !            12: GNU CC is distributed in the hope that it will be useful,
        !            13: but WITHOUT ANY WARRANTY; without even the implied warranty of
        !            14: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        !            15: GNU General Public License for more details.
        !            16: 
        !            17: You should have received a copy of the GNU General Public License
        !            18: along with GNU CC; see the file COPYING.  If not, write to
        !            19: the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
        !            20: 
        !            21: #include <stdio.h>
        !            22: #include "config.h"
        !            23: #include "rtl.h"
        !            24: #include "regs.h"
        !            25: #include "hard-reg-set.h"
        !            26: #include "real.h"
        !            27: #include "insn-config.h"
        !            28: #include "conditions.h"
        !            29: #include "insn-flags.h"
        !            30: #include "output.h"
        !            31: #include "insn-attr.h"
        !            32: #include "flags.h"
        !            33: #include "recog.h"
        !            34: #include "expr.h"
        !            35: #include "obstack.h"
        !            36: #include "tree.h"
        !            37: 
        !            38: extern char *language_string;
        !            39: 
        !            40: #define min(A,B)       ((A) < (B) ? (A) : (B))
        !            41: #define max(A,B)       ((A) > (B) ? (A) : (B))
        !            42: 
        !            43: /* Set to non-zero by "fix" operation to indicate that itrunc and
        !            44:    uitrunc must be defined.  */
        !            45: 
        !            46: int rs6000_trunc_used;
        !            47: 
        !            48: /* Set to non-zero once they have been defined.  */
        !            49: 
        !            50: static int trunc_defined;
        !            51: 
        !            52: /* Save information from a "cmpxx" operation until the branch or scc is
        !            53:    emitted.  */
        !            54: 
        !            55: rtx rs6000_compare_op0, rs6000_compare_op1;
        !            56: int rs6000_compare_fp_p;
        !            57: 
        !            58: /* Return non-zero if this function is known to have a null epilogue.  */
        !            59: 
        !            60: int
        !            61: direct_return ()
        !            62: {
        !            63:   return (reload_completed
        !            64:          && first_reg_to_save () == 32
        !            65:          && first_fp_reg_to_save () == 64
        !            66:          && ! regs_ever_live[65]
        !            67:          && ! rs6000_pushes_stack ());
        !            68: }
        !            69: 
        !            70: /* Returns 1 always.  */
        !            71: 
        !            72: int
        !            73: any_operand (op, mode)
        !            74:      register rtx op;
        !            75:      enum machine_mode mode;
        !            76: {
        !            77:   return 1;
        !            78: }
        !            79: 
        !            80: /* Return 1 if OP is a constant that can fit in a D field.  */
        !            81: 
        !            82: int
        !            83: short_cint_operand (op, mode)
        !            84:      register rtx op;
        !            85:      enum machine_mode mode;
        !            86: {
        !            87:   return (GET_CODE (op) == CONST_INT
        !            88:          && (unsigned) (INTVAL (op) + 0x8000) < 0x10000);
        !            89: }
        !            90: 
        !            91: /* Similar for a unsigned D field.  */
        !            92: 
        !            93: int
        !            94: u_short_cint_operand (op, mode)
        !            95:      register rtx op;
        !            96:      enum machine_mode mode;
        !            97: {
        !            98:   return (GET_CODE (op) == CONST_INT && (INTVAL (op) & 0xffff0000) == 0);
        !            99: }
        !           100: 
        !           101: /* Return 1 if OP is a CONST_INT that cannot fit in a signed D field.  */
        !           102: 
        !           103: int
        !           104: non_short_cint_operand (op, mode)
        !           105:      register rtx op;
        !           106:      enum machine_mode mode;
        !           107: {
        !           108:   return (GET_CODE (op) == CONST_INT
        !           109:          && (unsigned) (INTVAL (op) + 0x8000) >= 0x10000);
        !           110: }
        !           111: 
        !           112: /* Returns 1 if OP is a register that is not special (i.e., not MQ,
        !           113:    ctr, or lr).  */
        !           114: 
        !           115: int
        !           116: gpc_reg_operand (op, mode)
        !           117:      register rtx op;
        !           118:      enum machine_mode mode;
        !           119: {
        !           120:   return (register_operand (op, mode)
        !           121:          && (GET_CODE (op) != REG || REGNO (op) >= 67 || REGNO (op) < 64));
        !           122: }
        !           123: 
        !           124: /* Returns 1 if OP is either a pseudo-register or a register denoting a
        !           125:    CR field.  */
        !           126: 
        !           127: int
        !           128: cc_reg_operand (op, mode)
        !           129:      register rtx op;
        !           130:      enum machine_mode mode;
        !           131: {
        !           132:   return (register_operand (op, mode)
        !           133:          && (GET_CODE (op) != REG
        !           134:              || REGNO (op) >= FIRST_PSEUDO_REGISTER
        !           135:              || CR_REGNO_P (REGNO (op))));
        !           136: }
        !           137: 
        !           138: /* Returns 1 if OP is either a constant integer valid for a D-field or a
        !           139:    non-special register.  If a register, it must be in the proper mode unless
        !           140:    MODE is VOIDmode.  */
        !           141: 
        !           142: int
        !           143: reg_or_short_operand (op, mode)
        !           144:       register rtx op;
        !           145:       enum machine_mode mode;
        !           146: {
        !           147:   if (GET_CODE (op) == CONST_INT)
        !           148:     return short_cint_operand (op, mode);
        !           149: 
        !           150:   return gpc_reg_operand (op, mode);
        !           151: }
        !           152: 
        !           153: /* Similar, except check if the negation of the constant would be valid for
        !           154:    a D-field.  */
        !           155: 
        !           156: int
        !           157: reg_or_neg_short_operand (op, mode)
        !           158:       register rtx op;
        !           159:       enum machine_mode mode;
        !           160: {
        !           161:   if (GET_CODE (op) == CONST_INT)
        !           162:     return CONST_OK_FOR_LETTER_P (INTVAL (op), 'P');
        !           163: 
        !           164:   return gpc_reg_operand (op, mode);
        !           165: }
        !           166: 
        !           167: /* Return 1 if the operand is either a register or an integer whose high-order
        !           168:    16 bits are zero.  */
        !           169: 
        !           170: int
        !           171: reg_or_u_short_operand (op, mode)
        !           172:      register rtx op;
        !           173:      enum machine_mode mode;
        !           174: {
        !           175:   if (GET_CODE (op) == CONST_INT
        !           176:       && (INTVAL (op) & 0xffff0000) == 0)
        !           177:     return 1;
        !           178: 
        !           179:   return gpc_reg_operand (op, mode);
        !           180: }
        !           181: 
        !           182: /* Return 1 is the operand is either a non-special register or ANY
        !           183:    constant integer.  */
        !           184: 
        !           185: int
        !           186: reg_or_cint_operand (op, mode)
        !           187:     register rtx op;
        !           188:     enum machine_mode mode;
        !           189: {
        !           190:      return GET_CODE (op) == CONST_INT || gpc_reg_operand (op, mode);
        !           191: }
        !           192: 
        !           193: /* Return 1 if the operand is a CONST_DOUBLE and it can be put into a
        !           194:    register with one instruction per word.  For SFmode, this means  that
        !           195:    the low 16-bits are zero.  For DFmode, it means the low 16-bits of
        !           196:    the first word are zero and the high 16 bits of the second word
        !           197:    are zero (usually all bits in the low-order word will be zero).
        !           198: 
        !           199:    We only do this if we can safely read CONST_DOUBLE_{LOW,HIGH}.  */
        !           200: 
        !           201: int
        !           202: easy_fp_constant (op, mode)
        !           203:      register rtx op;
        !           204:      register enum machine_mode mode;
        !           205: {
        !           206:   rtx low, high;
        !           207: 
        !           208:   if (GET_CODE (op) != CONST_DOUBLE
        !           209:       || GET_MODE (op) != mode
        !           210:       || GET_MODE_CLASS (mode) != MODE_FLOAT)
        !           211:     return 0;
        !           212: 
        !           213:   high = operand_subword (op, 0, 0, mode);
        !           214:   low = operand_subword (op, 1, 0, mode);
        !           215: 
        !           216:   if (high == 0 || GET_CODE (high) != CONST_INT || (INTVAL (high) & 0xffff))
        !           217:     return 0;
        !           218: 
        !           219:   return (mode == SFmode
        !           220:          || (low != 0 && GET_CODE (low) == CONST_INT
        !           221:              && (INTVAL (low) & 0xffff0000) == 0));
        !           222: }
        !           223:       
        !           224: /* Return 1 if the operand is either a floating-point register, a pseudo
        !           225:    register, or memory.  */
        !           226: 
        !           227: int
        !           228: fp_reg_or_mem_operand (op, mode)
        !           229:      register rtx op;
        !           230:      enum machine_mode mode;
        !           231: {
        !           232:   return (memory_operand (op, mode)
        !           233:          || (register_operand (op, mode)
        !           234:              && (GET_CODE (op) != REG
        !           235:                  || REGNO (op) >= FIRST_PSEUDO_REGISTER
        !           236:                  || FP_REGNO_P (REGNO (op)))));
        !           237: }
        !           238: 
        !           239: /* Return 1 if the operand is either an easy FP constant (see above) or
        !           240:    memory.  */
        !           241: 
        !           242: int
        !           243: mem_or_easy_const_operand (op, mode)
        !           244:      register rtx op;
        !           245:      enum machine_mode mode;
        !           246: {
        !           247:   return memory_operand (op, mode) || easy_fp_constant (op, mode);
        !           248: }
        !           249: 
        !           250: /* Return 1 if the operand is either a non-special register or an item
        !           251:    that can be used as the operand of an SI add insn.  */
        !           252: 
        !           253: int
        !           254: add_operand (op, mode)
        !           255:     register rtx op;
        !           256:     enum machine_mode mode;
        !           257: {
        !           258:   return (reg_or_short_operand (op, mode)
        !           259:          || (GET_CODE (op) == CONST_INT && (INTVAL (op) & 0xffff) == 0));
        !           260: }
        !           261: 
        !           262: /* Return 1 if OP is a constant but not a valid add_operand.  */
        !           263: 
        !           264: int
        !           265: non_add_cint_operand (op, mode)
        !           266:      register rtx op;
        !           267:      enum machine_mode mode;
        !           268: {
        !           269:   return (GET_CODE (op) == CONST_INT
        !           270:          && (unsigned) (INTVAL (op) + 0x8000) >= 0x10000
        !           271:          && (INTVAL (op) & 0xffff) != 0);
        !           272: }
        !           273: 
        !           274: /* Return 1 if the operand is a non-special register or a constant that
        !           275:    can be used as the operand of an OR or XOR insn on the RS/6000.  */
        !           276: 
        !           277: int
        !           278: logical_operand (op, mode)
        !           279:      register rtx op;
        !           280:      enum machine_mode mode;
        !           281: {
        !           282:   return (gpc_reg_operand (op, mode)
        !           283:          || (GET_CODE (op) == CONST_INT
        !           284:              && ((INTVAL (op) & 0xffff0000) == 0
        !           285:                  || (INTVAL (op) & 0xffff) == 0)));
        !           286: }
        !           287: 
        !           288: /* Return 1 if C is a constant that is not a logical operand (as
        !           289:    above).  */
        !           290: 
        !           291: int
        !           292: non_logical_cint_operand (op, mode)
        !           293:      register rtx op;
        !           294:      enum machine_mode mode;
        !           295: {
        !           296:   return (GET_CODE (op) == CONST_INT
        !           297:          && (INTVAL (op) & 0xffff0000) != 0
        !           298:          && (INTVAL (op) & 0xffff) != 0);
        !           299: }
        !           300: 
        !           301: /* Return 1 if C is a constant that can be encoded in a mask on the
        !           302:    RS/6000.  It is if there are no more than two 1->0 or 0->1 transitions.
        !           303:    Reject all ones and all zeros, since these should have been optimized
        !           304:    away and confuse the making of MB and ME.  */
        !           305: 
        !           306: int
        !           307: mask_constant (c)
        !           308:      register int c;
        !           309: {
        !           310:   int i;
        !           311:   int last_bit_value;
        !           312:   int transitions = 0;
        !           313: 
        !           314:   if (c == 0 || c == ~0)
        !           315:     return 0;
        !           316: 
        !           317:   last_bit_value = c & 1;
        !           318: 
        !           319:   for (i = 1; i < 32; i++)
        !           320:     if (((c >>= 1) & 1) != last_bit_value)
        !           321:       last_bit_value ^= 1, transitions++;
        !           322: 
        !           323:   return transitions <= 2;
        !           324: }
        !           325: 
        !           326: /* Return 1 if the operand is a constant that is a mask on the RS/6000. */
        !           327: 
        !           328: int
        !           329: mask_operand (op, mode)
        !           330:      register rtx op;
        !           331:      enum machine_mode mode;
        !           332: {
        !           333:   return GET_CODE (op) == CONST_INT && mask_constant (INTVAL (op));
        !           334: }
        !           335: 
        !           336: /* Return 1 if the operand is either a non-special register or a
        !           337:    constant that can be used as the operand of an RS/6000 logical AND insn.  */
        !           338: 
        !           339: int
        !           340: and_operand (op, mode)
        !           341:     register rtx op;
        !           342:     enum machine_mode mode;
        !           343: {
        !           344:   return (reg_or_short_operand (op, mode)
        !           345:          || logical_operand (op, mode)
        !           346:          || mask_operand (op, mode));
        !           347: }
        !           348: 
        !           349: /* Return 1 if the operand is a constant but not a valid operand for an AND
        !           350:    insn.  */
        !           351: 
        !           352: int
        !           353: non_and_cint_operand (op, mode)
        !           354:      register rtx op;
        !           355:      enum machine_mode mode;
        !           356: {
        !           357:   return GET_CODE (op) == CONST_INT && ! and_operand (op, mode);
        !           358: }
        !           359: 
        !           360: /* Return 1 if the operand is a general register or memory operand.  */
        !           361: 
        !           362: int
        !           363: reg_or_mem_operand (op, mode)
        !           364:      register rtx op;
        !           365:      register enum machine_mode mode;
        !           366: {
        !           367:   return gpc_reg_operand (op, mode) || memory_operand (op, mode);
        !           368: }
        !           369: 
        !           370: /* Return 1 if the operand, used inside a MEM, is a valid first argument
        !           371:    to CALL.  This is a SYMBOL_REF or a pseudo-register, which will be
        !           372:    forced to lr.  */
        !           373: 
        !           374: int
        !           375: call_operand (op, mode)
        !           376:      register rtx op;
        !           377:      enum machine_mode mode;
        !           378: {
        !           379:   if (mode != VOIDmode && GET_MODE (op) != mode)
        !           380:     return 0;
        !           381: 
        !           382:   return (GET_CODE (op) == SYMBOL_REF
        !           383:          || (GET_CODE (op) == REG && REGNO (op) >= FIRST_PSEUDO_REGISTER));
        !           384: }
        !           385: 
        !           386: /* Return 1 if this operand is a valid input for a move insn.  */
        !           387: 
        !           388: int
        !           389: input_operand (op, mode)
        !           390:      register rtx op;
        !           391:      enum machine_mode mode;
        !           392: {
        !           393:   if (memory_operand (op, mode))
        !           394:     return 1;
        !           395: 
        !           396:   /* For floating-point or multi-word mode, only register or memory
        !           397:      is valid.  */
        !           398:   if (GET_MODE_CLASS (mode) == MODE_FLOAT
        !           399:       || GET_MODE_SIZE (mode) > UNITS_PER_WORD)
        !           400:     return gpc_reg_operand (op, mode);
        !           401: 
        !           402:   /* The only cases left are integral modes one word or smaller (we
        !           403:      do not get called for MODE_CC values).  These can be in any
        !           404:      register.  */
        !           405:   if (register_operand (op, mode))
        !           406:     return;
        !           407: 
        !           408:   /* For HImode and QImode, any constant is valid. */
        !           409:   if ((mode == HImode || mode == QImode)
        !           410:       && GET_CODE (op) == CONST_INT)
        !           411:     return 1;
        !           412: 
        !           413:   /* Otherwise, we will be doing this SET with an add, so anything valid
        !           414:      for an add will be valid.  */
        !           415:   return add_operand (op, mode);
        !           416: }
        !           417: 
        !           418: /* Return 1 if OP is a load multiple operation.  It is known to be a
        !           419:    PARALLEL and the first section will be tested.  */
        !           420: 
        !           421: int
        !           422: load_multiple_operation (op, mode)
        !           423:      rtx op;
        !           424:      enum machine_mode mode;
        !           425: {
        !           426:   int count = XVECLEN (op, 0);
        !           427:   int dest_regno;
        !           428:   rtx src_addr;
        !           429:   int i;
        !           430: 
        !           431:   /* Perform a quick check so we don't blow up below.  */
        !           432:   if (count <= 1
        !           433:       || GET_CODE (XVECEXP (op, 0, 0)) != SET
        !           434:       || GET_CODE (SET_DEST (XVECEXP (op, 0, 0))) != REG
        !           435:       || GET_CODE (SET_SRC (XVECEXP (op, 0, 0))) != MEM)
        !           436:     return 0;
        !           437: 
        !           438:   dest_regno = REGNO (SET_DEST (XVECEXP (op, 0, 0)));
        !           439:   src_addr = XEXP (SET_SRC (XVECEXP (op, 0, 0)), 0);
        !           440: 
        !           441:   for (i = 1; i < count; i++)
        !           442:     {
        !           443:       rtx elt = XVECEXP (op, 0, i);
        !           444: 
        !           445:       if (GET_CODE (elt) != SET
        !           446:          || GET_CODE (SET_DEST (elt)) != REG
        !           447:          || GET_MODE (SET_DEST (elt)) != SImode
        !           448:          || REGNO (SET_DEST (elt)) != dest_regno + i
        !           449:          || GET_CODE (SET_SRC (elt)) != MEM
        !           450:          || GET_MODE (SET_SRC (elt)) != SImode
        !           451:          || GET_CODE (XEXP (SET_SRC (elt), 0)) != PLUS
        !           452:          || ! rtx_equal_p (XEXP (XEXP (SET_SRC (elt), 0), 0), src_addr)
        !           453:          || GET_CODE (XEXP (XEXP (SET_SRC (elt), 0), 1)) != CONST_INT
        !           454:          || INTVAL (XEXP (XEXP (SET_SRC (elt), 0), 1)) != i * 4)
        !           455:        return 0;
        !           456:     }
        !           457: 
        !           458:   return 1;
        !           459: }
        !           460: 
        !           461: /* Similar, but tests for store multiple.  Here, the second vector element
        !           462:    is a CLOBBER.  It will be tested later.  */
        !           463: 
        !           464: int
        !           465: store_multiple_operation (op, mode)
        !           466:      rtx op;
        !           467:      enum machine_mode mode;
        !           468: {
        !           469:   int count = XVECLEN (op, 0) - 1;
        !           470:   int src_regno;
        !           471:   rtx dest_addr;
        !           472:   int i;
        !           473: 
        !           474:   /* Perform a quick check so we don't blow up below.  */
        !           475:   if (count <= 1
        !           476:       || GET_CODE (XVECEXP (op, 0, 0)) != SET
        !           477:       || GET_CODE (SET_DEST (XVECEXP (op, 0, 0))) != MEM
        !           478:       || GET_CODE (SET_SRC (XVECEXP (op, 0, 0))) != REG)
        !           479:     return 0;
        !           480: 
        !           481:   src_regno = REGNO (SET_SRC (XVECEXP (op, 0, 0)));
        !           482:   dest_addr = XEXP (SET_DEST (XVECEXP (op, 0, 0)), 0);
        !           483: 
        !           484:   for (i = 1; i < count; i++)
        !           485:     {
        !           486:       rtx elt = XVECEXP (op, 0, i + 1);
        !           487: 
        !           488:       if (GET_CODE (elt) != SET
        !           489:          || GET_CODE (SET_SRC (elt)) != REG
        !           490:          || GET_MODE (SET_SRC (elt)) != SImode
        !           491:          || REGNO (SET_SRC (elt)) != src_regno + i
        !           492:          || GET_CODE (SET_DEST (elt)) != MEM
        !           493:          || GET_MODE (SET_DEST (elt)) != SImode
        !           494:          || GET_CODE (XEXP (SET_DEST (elt), 0)) != PLUS
        !           495:          || ! rtx_equal_p (XEXP (XEXP (SET_DEST (elt), 0), 0), dest_addr)
        !           496:          || GET_CODE (XEXP (XEXP (SET_DEST (elt), 0), 1)) != CONST_INT
        !           497:          || INTVAL (XEXP (XEXP (SET_DEST (elt), 0), 1)) != i * 4)
        !           498:        return 0;
        !           499:     }
        !           500: 
        !           501:   return 1;
        !           502: }
        !           503: 
        !           504: /* Return 1 if OP is a comparison operation that is valid for a branch insn.
        !           505:    We only check the opcode against the mode of the CC value here.  */
        !           506: 
        !           507: int
        !           508: branch_comparison_operator (op, mode)
        !           509:      register rtx op;
        !           510:      enum machine_mode mode;
        !           511: {
        !           512:   enum rtx_code code = GET_CODE (op);
        !           513:   enum machine_mode cc_mode;
        !           514: 
        !           515:   if (GET_RTX_CLASS (code) != '<')
        !           516:     return 0;
        !           517: 
        !           518:   cc_mode = GET_MODE (XEXP (op, 0));
        !           519:   if (GET_MODE_CLASS (cc_mode) != MODE_CC)
        !           520:     return 0;
        !           521: 
        !           522:   if ((code == GT || code == LT || code == GE || code == LE)
        !           523:       && cc_mode == CCUNSmode)
        !           524:     return 0;
        !           525: 
        !           526:   if ((code == GTU || code == LTU || code == GEU || code == LEU)
        !           527:       && (cc_mode != CCUNSmode))
        !           528:     return 0;
        !           529: 
        !           530:   return 1;
        !           531: }
        !           532: 
        !           533: /* Return 1 if OP is a comparison operation that is valid for an scc insn.
        !           534:    We check the opcode against the mode of the CC value and disallow EQ or
        !           535:    NE comparisons for integers.  */
        !           536: 
        !           537: int
        !           538: scc_comparison_operator (op, mode)
        !           539:      register rtx op;
        !           540:      enum machine_mode mode;
        !           541: {
        !           542:   enum rtx_code code = GET_CODE (op);
        !           543:   enum machine_mode cc_mode;
        !           544: 
        !           545:   if (GET_MODE (op) != mode && mode != VOIDmode)
        !           546:     return 0;
        !           547: 
        !           548:   if (GET_RTX_CLASS (code) != '<')
        !           549:     return 0;
        !           550: 
        !           551:   cc_mode = GET_MODE (XEXP (op, 0));
        !           552:   if (GET_MODE_CLASS (cc_mode) != MODE_CC)
        !           553:     return 0;
        !           554: 
        !           555:   if (code == NE && cc_mode != CCFPmode)
        !           556:     return 0;
        !           557: 
        !           558:   if ((code == GT || code == LT || code == GE || code == LE)
        !           559:       && cc_mode == CCUNSmode)
        !           560:     return 0;
        !           561: 
        !           562:   if ((code == GTU || code == LTU || code == GEU || code == LEU)
        !           563:       && (cc_mode != CCUNSmode))
        !           564:     return 0;
        !           565: 
        !           566:   if (cc_mode == CCEQmode && code != EQ && code != NE)
        !           567:     return 0;
        !           568: 
        !           569:   return 1;
        !           570: }
        !           571: 
        !           572: /* Return 1 if ANDOP is a mask that has no bits on that are not in the
        !           573:    mask required to convert the result of a rotate insn into a shift
        !           574:    left insn of SHIFTOP bits.  Both are known to be CONST_INT.  */
        !           575: 
        !           576: int
        !           577: includes_lshift_p (shiftop, andop)
        !           578:      register rtx shiftop;
        !           579:      register rtx andop;
        !           580: {
        !           581:   int shift_mask = (~0 << INTVAL (shiftop));
        !           582: 
        !           583:   return (INTVAL (andop) & ~shift_mask) == 0;
        !           584: }
        !           585: 
        !           586: /* Similar, but for right shift.  */
        !           587: 
        !           588: int
        !           589: includes_rshift_p (shiftop, andop)
        !           590:      register rtx shiftop;
        !           591:      register rtx andop;
        !           592: {
        !           593:   unsigned shift_mask = ~0;
        !           594: 
        !           595:   shift_mask >>= INTVAL (shiftop);
        !           596: 
        !           597:   return (INTVAL (andop) & ~ shift_mask) == 0;
        !           598: }
        !           599: 
        !           600: /* Return the register class of a scratch register needed to copy IN into
        !           601:    or out of a register in CLASS in MODE.  If it can be done directly,
        !           602:    NO_REGS is returned.  */
        !           603: 
        !           604: enum reg_class
        !           605: secondary_reload_class (class, mode, in)
        !           606:      enum reg_class class;
        !           607:      enum machine_mode mode;
        !           608:      rtx in;
        !           609: {
        !           610:   int regno = true_regnum (in);
        !           611: 
        !           612:   if (regno >= FIRST_PSEUDO_REGISTER)
        !           613:     regno = -1;
        !           614: 
        !           615:   /* We can place anything into GENERAL_REGS and can put GENERAL_REGS
        !           616:      into anything.  */
        !           617:   if (class == GENERAL_REGS || class == BASE_REGS
        !           618:       || (regno >= 0 && INT_REGNO_P (regno)))
        !           619:     return NO_REGS;
        !           620: 
        !           621:   /* Constants, memory, and FP registers can go into FP registers.  */
        !           622:   if ((regno == -1 || FP_REGNO_P (regno))
        !           623:       && (class == FLOAT_REGS || class == NON_SPECIAL_REGS))
        !           624:     return NO_REGS;
        !           625: 
        !           626:   /* We can copy among the CR registers.  */
        !           627:   if ((class == CR_REGS || class == CR0_REGS)
        !           628:       && regno >= 0 && CR_REGNO_P (regno))
        !           629:     return NO_REGS;
        !           630: 
        !           631:   /* Otherwise, we need GENERAL_REGS.  */
        !           632:   return GENERAL_REGS;
        !           633: }
        !           634: 
        !           635: /* Given a comparison operation, return the bit number in CCR to test.  We
        !           636:    know this is a valid comparison.  
        !           637: 
        !           638:    SCC_P is 1 if this is for an scc.  That means that %D will have been
        !           639:    used instead of %C, so the bits will be in different places.
        !           640: 
        !           641:    Return -1 if OP isn't a valid comparison for some reason.  */
        !           642: 
        !           643: int
        !           644: ccr_bit (op, scc_p)
        !           645:      register rtx op;
        !           646:      int scc_p;
        !           647: {
        !           648:   enum rtx_code code = GET_CODE (op);
        !           649:   enum machine_mode cc_mode;
        !           650:   int cc_regnum;
        !           651:   int base_bit;
        !           652: 
        !           653:   if (GET_RTX_CLASS (code) != '<')
        !           654:     return -1;
        !           655: 
        !           656:   cc_mode = GET_MODE (XEXP (op, 0));
        !           657:   cc_regnum = REGNO (XEXP (op, 0));
        !           658:   base_bit = 4 * (cc_regnum - 68);
        !           659: 
        !           660:   /* In CCEQmode cases we have made sure that the result is always in the
        !           661:      third bit of the CR field.  */
        !           662: 
        !           663:   if (cc_mode == CCEQmode)
        !           664:     return base_bit + 3;
        !           665: 
        !           666:   switch (code)
        !           667:     {
        !           668:     case NE:
        !           669:       return scc_p ? base_bit + 3 : base_bit + 2;
        !           670:     case EQ:
        !           671:       return base_bit + 2;
        !           672:     case GT:  case GTU:
        !           673:       return base_bit + 1;
        !           674:     case LT:  case LTU:
        !           675:       return base_bit;
        !           676: 
        !           677:     case GE:  case GEU:
        !           678:       /* If floating-point, we will have done a cror to put the bit in the
        !           679:         unordered position.  So test that bit.  For integer, this is ! LT
        !           680:         unless this is an scc insn.  */
        !           681:       return cc_mode == CCFPmode || scc_p ? base_bit + 3 : base_bit;
        !           682: 
        !           683:     case LE:  case LEU:
        !           684:       return cc_mode == CCFPmode || scc_p ? base_bit + 3 : base_bit + 1;
        !           685: 
        !           686:     default:
        !           687:       abort ();
        !           688:     }
        !           689: }
        !           690: 
        !           691: /* Print an operand.  Recognize special options, documented below.  */
        !           692: 
        !           693: void
        !           694: print_operand (file, x, code)
        !           695:     FILE *file;
        !           696:     rtx x;
        !           697:     char code;
        !           698: {
        !           699:   int i;
        !           700:   int val;
        !           701: 
        !           702:   /* These macros test for integers and extract the low-order bits.  */
        !           703: #define INT_P(X)  \
        !           704: ((GET_CODE (X) == CONST_INT || GET_CODE (X) == CONST_DOUBLE)   \
        !           705:  && GET_MODE (X) == VOIDmode)
        !           706: 
        !           707: #define INT_LOWPART(X) \
        !           708:   (GET_CODE (X) == CONST_INT ? INTVAL (X) : CONST_DOUBLE_LOW (X))
        !           709: 
        !           710:   switch (code)
        !           711:     {
        !           712:     case 'A':
        !           713:       /* If X is a constant integer whose low-order 5 bits are zero,
        !           714:         write 'l'.  Otherwise, write 'r'.  This is a kludge to fix a bug
        !           715:         in the RS/6000 assembler where "sri" with a zero shift count
        !           716:         write a trash instruction.  */
        !           717:       if (GET_CODE (x) == CONST_INT && (INTVAL (x) & 31) == 0)
        !           718:        fprintf (file, "l");
        !           719:       else
        !           720:        fprintf (file, "r");
        !           721:       return;
        !           722: 
        !           723:     case 'b':
        !           724:       /* Low-order 16 bits of constant, unsigned.  */
        !           725:       if (! INT_P (x))
        !           726:        output_operand_lossage ("invalid %%b value");
        !           727: 
        !           728:       fprintf (file, "%d", INT_LOWPART (x) & 0xffff);
        !           729:       return;
        !           730: 
        !           731:     case 'C':
        !           732:       /* This is an optional cror needed for LE or GE floating-point
        !           733:         comparisons.  Otherwise write nothing.  */
        !           734:       if ((GET_CODE (x) == LE || GET_CODE (x) == GE)
        !           735:          && GET_MODE (XEXP (x, 0)) == CCFPmode)
        !           736:        {
        !           737:          int base_bit = 4 * (REGNO (XEXP (x, 0)) - 68);
        !           738: 
        !           739:          fprintf (file, "cror %d,%d,%d\n\t", base_bit + 3,
        !           740:                   base_bit + 2, base_bit + (GET_CODE (x) == GE));
        !           741:        }
        !           742:       return;
        !           743: 
        !           744:     case 'D':
        !           745:       /* Similar, except that this is for an scc, so we must be able to
        !           746:         encode the test in a single bit that is one.  We do the above
        !           747:         for any LE, GE, GEU, or LEU and invert the bit for NE.  */
        !           748:       if (GET_CODE (x) == LE || GET_CODE (x) == GE
        !           749:          || GET_CODE (x) == LEU || GET_CODE (x) == GEU)
        !           750:        {
        !           751:          int base_bit = 4 * (REGNO (XEXP (x, 0)) - 68);
        !           752: 
        !           753:          fprintf (file, "cror %d,%d,%d\n\t", base_bit + 3,
        !           754:                   base_bit + 2,
        !           755:                   base_bit + (GET_CODE (x) == GE || GET_CODE (x) == GEU));
        !           756:        }
        !           757: 
        !           758:       else if (GET_CODE (x) == NE)
        !           759:        {
        !           760:          int base_bit = 4 * (REGNO (XEXP (x, 0)) - 68);
        !           761: 
        !           762:          fprintf (file, "crnor %d,%d,%d\n\t", base_bit + 3,
        !           763:                   base_bit + 2, base_bit + 2);
        !           764:        }
        !           765:       return;
        !           766: 
        !           767:     case 'E':
        !           768:       /* X is a CR register.  Print the number of the third bit of the CR */
        !           769:       if (GET_CODE (x) != REG || ! CR_REGNO_P (REGNO (x)))
        !           770:        output_operand_lossage ("invalid %%E value");
        !           771: 
        !           772:       fprintf(file, "%d", 4 * (REGNO (x) - 68) + 3);
        !           773:       break;
        !           774: 
        !           775:     case 'f':
        !           776:       /* X is a CR register.  Print the shift count needed to move it
        !           777:         to the high-order four bits.  */
        !           778:       if (GET_CODE (x) != REG || ! CR_REGNO_P (REGNO (x)))
        !           779:        output_operand_lossage ("invalid %%f value");
        !           780:       else
        !           781:        fprintf (file, "%d", 4 * (REGNO (x) - 68));
        !           782:       return;
        !           783: 
        !           784:     case 'F':
        !           785:       /* Similar, but print the count for the rotate in the opposite
        !           786:         direction.  */
        !           787:       if (GET_CODE (x) != REG || ! CR_REGNO_P (REGNO (x)))
        !           788:        output_operand_lossage ("invalid %%F value");
        !           789:       else
        !           790:        fprintf (file, "%d", 32 - 4 * (REGNO (x) - 68));
        !           791:       return;
        !           792: 
        !           793:     case 'G':
        !           794:       /* X is a constant integer.  If it is negative, print "m",
        !           795:         otherwise print "z".  This is to make a aze or ame insn.  */
        !           796:       if (GET_CODE (x) != CONST_INT)
        !           797:        output_operand_lossage ("invalid %%G value");
        !           798:       else if (INTVAL (x) >= 0)
        !           799:        fprintf (file, "z");
        !           800:       else
        !           801:        fprintf (file, "m");
        !           802:       return;
        !           803:        
        !           804:     case 'h':
        !           805:       /* If constant, output low-order five bits.  Otherwise,
        !           806:         write normally. */
        !           807:       if (INT_P (x))
        !           808:        fprintf (file, "%d", INT_LOWPART (x) & 31);
        !           809:       else
        !           810:        print_operand (file, x, 0);
        !           811:       return;
        !           812: 
        !           813:     case 'H':
        !           814:       /* X must be a constant.  Output the low order 5 bits plus 24.  */
        !           815:       if (! INT_P (x))
        !           816:        output_operand_lossage ("invalid %%H value");
        !           817: 
        !           818:       fprintf (file, "%d", (INT_LOWPART (x) + 24) & 31);
        !           819:       return;
        !           820: 
        !           821:     case 'I':
        !           822:       /* Print `i' if this is a constant, else nothing.  */
        !           823:       if (INT_P (x))
        !           824:        fprintf (file, "i");
        !           825:       return;
        !           826: 
        !           827:     case 'j':
        !           828:       /* Write the bit number in CCR for jump.  */
        !           829:       i = ccr_bit (x, 0);
        !           830:       if (i == -1)
        !           831:        output_operand_lossage ("invalid %%j code");
        !           832:       else
        !           833:        fprintf (file, "%d", i);
        !           834:       return;
        !           835: 
        !           836:     case 'J':
        !           837:       /* Similar, but add one for shift count in rlinm for scc and pass
        !           838:         scc flag to `ccr_bit'.  */
        !           839:       i = ccr_bit (x, 1);
        !           840:       if (i == -1)
        !           841:        output_operand_lossage ("invalid %%J code");
        !           842:       else
        !           843:        fprintf (file, "%d", i + 1);
        !           844:       return;
        !           845: 
        !           846:     case 'k':
        !           847:       /* X must be a constant.  Write the 1's complement of the
        !           848:         constant.  */
        !           849:       if (! INT_P (x))
        !           850:        output_operand_lossage ("invalid %%k value");
        !           851: 
        !           852:       fprintf (file, "%d", ~ INT_LOWPART (x));
        !           853:       return;
        !           854: 
        !           855:     case 'L':
        !           856:       /* Write second word of DImode or DFmode reference.  Works on register
        !           857:         or non-indexed memory only.  */
        !           858:       if (GET_CODE (x) == REG)
        !           859:        fprintf (file, "%d", REGNO (x) + 1);
        !           860:       else if (GET_CODE (x) == MEM)
        !           861:        {
        !           862:          /* Handle possible auto-increment.  Since it is pre-increment and
        !           863:             we have already done it, we can just use an offset of four.  */
        !           864:          if (GET_CODE (XEXP (x, 0)) == PRE_INC
        !           865:              || GET_CODE (XEXP (x, 0)) == PRE_DEC)
        !           866:            output_address (plus_constant (XEXP (XEXP (x, 0), 0), 4));
        !           867:          else
        !           868:            output_address (plus_constant (XEXP (x, 0), 4));
        !           869:        }
        !           870:       return;
        !           871:                            
        !           872:     case 'm':
        !           873:       /* MB value for a mask operand.  */
        !           874:       if (! mask_operand (x, VOIDmode))
        !           875:        output_operand_lossage ("invalid %%m value");
        !           876: 
        !           877:       val = INT_LOWPART (x);
        !           878: 
        !           879:       /* If the high bit is set and the low bit is not, the value is zero.
        !           880:         If the high bit is zero, the value is the first 1 bit we find from
        !           881:         the left.  */
        !           882:       if (val < 0 && (val & 1) == 0)
        !           883:        {
        !           884:          fprintf (file, "0");
        !           885:          return;
        !           886:        }
        !           887:       else if (val >= 0)
        !           888:        {
        !           889:          for (i = 1; i < 32; i++)
        !           890:            if ((val <<= 1) < 0)
        !           891:              break;
        !           892:          fprintf (file, "%d", i);
        !           893:          return;
        !           894:        }
        !           895:          
        !           896:       /* Otherwise, look for the first 0 bit from the right.  The result is its
        !           897:         number plus 1. We know the low-order bit is one.  */
        !           898:       for (i = 0; i < 32; i++)
        !           899:        if (((val >>= 1) & 1) == 0)
        !           900:          break;
        !           901: 
        !           902:       /* If we ended in ...01, I would be 0.  The correct value is 31, so
        !           903:         we want 31 - i.  */
        !           904:       fprintf (file, "%d", 31 - i);
        !           905:       return;
        !           906: 
        !           907:     case 'M':
        !           908:       /* ME value for a mask operand.  */
        !           909:       if (! mask_operand (x, VOIDmode))
        !           910:        output_operand_lossage ("invalid %%m value");
        !           911: 
        !           912:       val = INT_LOWPART (x);
        !           913: 
        !           914:       /* If the low bit is set and the high bit is not, the value is 31.
        !           915:         If the low bit is zero, the value is the first 1 bit we find from
        !           916:         the right.  */
        !           917:       if ((val & 1) && val >= 0)
        !           918:        {
        !           919:          fprintf (file, "31");
        !           920:          return;
        !           921:        }
        !           922:       else if ((val & 1) == 0)
        !           923:        {
        !           924:          for (i = 0; i < 32; i++)
        !           925:            if ((val >>= 1) & 1)
        !           926:              break;
        !           927: 
        !           928:          /* If we had ....10, I would be 0.  The result should be
        !           929:             30, so we need 30 - i.  */
        !           930:          fprintf (file, "%d", 30 - i);
        !           931:          return;
        !           932:        }
        !           933:          
        !           934:       /* Otherwise, look for the first 0 bit from the left.  The result is its
        !           935:         number minus 1. We know the high-order bit is one.  */
        !           936:       for (i = 0; i < 32; i++)
        !           937:        if ((val <<= 1) >= 0)
        !           938:          break;
        !           939: 
        !           940:       fprintf (file, "%d", i);
        !           941:       return;
        !           942: 
        !           943:     case 'N':
        !           944:       /* Write the number of elements in the vector times 4.  */
        !           945:       if (GET_CODE (x) != PARALLEL)
        !           946:        output_operand_lossage ("invalid %%N value");
        !           947: 
        !           948:       fprintf (file, "%d", XVECLEN (x, 0) * 4);
        !           949:       return;
        !           950: 
        !           951:     case 'O':
        !           952:       /* Similar, but subtract 1 first.  */
        !           953:       if (GET_CODE (x) != PARALLEL)
        !           954:        output_operand_lossage ("invalid %%N value");
        !           955: 
        !           956:       fprintf (file, "%d", (XVECLEN (x, 0) - 1) * 4);
        !           957:       return;
        !           958: 
        !           959:     case 'p':
        !           960:       /* X is a CONST_INT that is a power of two.  Output the logarithm.  */
        !           961:       if (! INT_P (x)
        !           962:          || (i = exact_log2 (INT_LOWPART (x))) < 0)
        !           963:        output_operand_lossage ("invalid %%p value");
        !           964: 
        !           965:       fprintf (file, "%d", i);
        !           966:       return;
        !           967: 
        !           968:     case 'P':
        !           969:       /* The operand must be an indirect memory reference.  The result
        !           970:         is the register number. */
        !           971:       if (GET_CODE (x) != MEM || GET_CODE (XEXP (x, 0)) != REG
        !           972:          || REGNO (XEXP (x, 0)) >= 32)
        !           973:        output_operand_lossage ("invalid %%P value");
        !           974: 
        !           975:       fprintf (file, "%d", REGNO (XEXP (x, 0)));
        !           976:       return;
        !           977: 
        !           978:     case 'R':
        !           979:       /* X is a CR register.  Print the mask for `mtcrf'.  */
        !           980:       if (GET_CODE (x) != REG || ! CR_REGNO_P (REGNO (x)))
        !           981:        output_operand_lossage ("invalid %%R value");
        !           982:       else
        !           983:        fprintf (file, "%d", 128 >> (REGNO (x) - 68));
        !           984:       return;
        !           985: 
        !           986:     case 's':
        !           987:       /* Low 5 bits of 32 - value */
        !           988:       if (! INT_P (x))
        !           989:        output_operand_lossage ("invalid %%s value");
        !           990: 
        !           991:       fprintf (file, "%d", (32 - INT_LOWPART (x)) & 31);
        !           992:       return;
        !           993: 
        !           994:     case 'S':
        !           995:       /* Low 5 bits of 31 - value */
        !           996:       if (! INT_P (x))
        !           997:        output_operand_lossage ("invalid %%S value");
        !           998: 
        !           999:       fprintf (file, "%d", (31 - INT_LOWPART (x)) & 31);
        !          1000:       return;
        !          1001: 
        !          1002:     case 't':
        !          1003:       /* Write 12 if this jump operation will branch if true, 4 otherwise. 
        !          1004:         All floating-point operations except NE branch true and integer
        !          1005:         EQ, LT, GT, LTU and GTU also branch true.  */
        !          1006:       if (GET_RTX_CLASS (GET_CODE (x)) != '<')
        !          1007:        output_operand_lossage ("invalid %%t value");
        !          1008: 
        !          1009:       else if ((GET_MODE (XEXP (x, 0)) == CCFPmode
        !          1010:                && GET_CODE (x) != NE)
        !          1011:               || GET_CODE (x) == EQ
        !          1012:               || GET_CODE (x) == LT || GET_CODE (x) == GT
        !          1013:               || GET_CODE (x) == LTU || GET_CODE (x) == GTU)
        !          1014:        fprintf (file, "12");
        !          1015:       else
        !          1016:        fprintf (file, "4");
        !          1017:       return;
        !          1018:       
        !          1019:     case 'T':
        !          1020:       /* Opposite of 't': write 4 if this jump operation will branch if true,
        !          1021:         12 otherwise.   */
        !          1022:       if (GET_RTX_CLASS (GET_CODE (x)) != '<')
        !          1023:        output_operand_lossage ("invalid %%t value");
        !          1024: 
        !          1025:       else if ((GET_MODE (XEXP (x, 0)) == CCFPmode
        !          1026:                && GET_CODE (x) != NE)
        !          1027:               || GET_CODE (x) == EQ
        !          1028:               || GET_CODE (x) == LT || GET_CODE (x) == GT
        !          1029:               || GET_CODE (x) == LTU || GET_CODE (x) == GTU)
        !          1030:        fprintf (file, "4");
        !          1031:       else
        !          1032:        fprintf (file, "12");
        !          1033:       return;
        !          1034:       
        !          1035:     case 'u':
        !          1036:       /* High-order 16 bits of constant.  */
        !          1037:       if (! INT_P (x))
        !          1038:        output_operand_lossage ("invalid %%u value");
        !          1039: 
        !          1040:       fprintf (file, "%d", (INT_LOWPART (x) >> 16) & 0xffff);
        !          1041:       return;
        !          1042: 
        !          1043:     case 'U':
        !          1044:       /* Print `u' if this has an auto-increment or auto-decrement.  */
        !          1045:       if (GET_CODE (x) == MEM
        !          1046:          && (GET_CODE (XEXP (x, 0)) == PRE_INC
        !          1047:              || GET_CODE (XEXP (x, 0)) == PRE_DEC))
        !          1048:        fprintf (file, "u");
        !          1049:       return;
        !          1050: 
        !          1051:     case 'w':
        !          1052:       /* If constant, low-order 16 bits of constant, signed.  Otherwise, write
        !          1053:         normally.  */
        !          1054:       if (INT_P (x))
        !          1055:        fprintf (file, "%d",
        !          1056:                 (INT_LOWPART (x) & 0xffff) - 2 * (INT_LOWPART (x) & 0x8000));
        !          1057:       else
        !          1058:        print_operand (file, x, 0);
        !          1059:       return;
        !          1060: 
        !          1061:     case 'W':
        !          1062:       /* If constant, low-order 16 bits of constant, unsigned.
        !          1063:         Otherwise, write normally.  */
        !          1064:       if (INT_P (x))
        !          1065:        fprintf (file, "%d", INT_LOWPART (x) & 0xffff);
        !          1066:       else
        !          1067:        print_operand (file, x, 0);
        !          1068:       return;
        !          1069: 
        !          1070:     case 'X':
        !          1071:       if (GET_CODE (x) == MEM
        !          1072:          && LEGITIMATE_INDEXED_ADDRESS_P (XEXP (x, 0)))
        !          1073:        fprintf (file, "x");
        !          1074:       return;
        !          1075: 
        !          1076:     case 'Y':
        !          1077:       /* Like 'L', for third word of TImode  */
        !          1078:       if (GET_CODE (x) == REG)
        !          1079:        fprintf (file, "%d", REGNO (x) + 2);
        !          1080:       else if (GET_CODE (x) == MEM)
        !          1081:        {
        !          1082:          if (GET_CODE (XEXP (x, 0)) == PRE_INC
        !          1083:              || GET_CODE (XEXP (x, 0)) == PRE_DEC)
        !          1084:            output_address (plus_constant (XEXP (XEXP (x, 0), 0), 8));
        !          1085:          else
        !          1086:            output_address (plus_constant (XEXP (x, 0), 8));
        !          1087:        }
        !          1088:       return;
        !          1089:                            
        !          1090:     case 'z':
        !          1091:       /* X is a SYMBOL_REF.  Write out the name preceded by a
        !          1092:         period and without any trailing data in brackets.  Used for function
        !          1093:         names.  */
        !          1094:       if (GET_CODE (x) != SYMBOL_REF)
        !          1095:        abort ();
        !          1096: 
        !          1097:       fprintf (file, ".");
        !          1098:       RS6000_OUTPUT_BASENAME (file, XSTR (x, 0));
        !          1099:       return;
        !          1100: 
        !          1101:     case 'Z':
        !          1102:       /* Like 'L', for last word of TImode.  */
        !          1103:       if (GET_CODE (x) == REG)
        !          1104:        fprintf (file, "%d", REGNO (x) + 3);
        !          1105:       else if (GET_CODE (x) == MEM)
        !          1106:        {
        !          1107:          if (GET_CODE (XEXP (x, 0)) == PRE_INC
        !          1108:              || GET_CODE (XEXP (x, 0)) == PRE_DEC)
        !          1109:            output_address (plus_constant (XEXP (XEXP (x, 0), 0), 12));
        !          1110:          else
        !          1111:            output_address (plus_constant (XEXP (x, 0), 12));
        !          1112:        }
        !          1113:       return;
        !          1114:                            
        !          1115:     case 0:
        !          1116:       if (GET_CODE (x) == REG)
        !          1117:        fprintf (file, "%s", reg_names[REGNO (x)]);
        !          1118:       else if (GET_CODE (x) == MEM)
        !          1119:        {
        !          1120:          /* We need to handle PRE_INC and PRE_DEC here, since we need to
        !          1121:             know the width from the mode.  */
        !          1122:          if (GET_CODE (XEXP (x, 0)) == PRE_INC)
        !          1123:            fprintf (file, "%d(%d)", GET_MODE_SIZE (GET_MODE (x)),
        !          1124:                     REGNO (XEXP (XEXP (x, 0), 0)));
        !          1125:          else if (GET_CODE (XEXP (x, 0)) == PRE_DEC)
        !          1126:            fprintf (file, "%d(%d)", - GET_MODE_SIZE (GET_MODE (x)),
        !          1127:                     REGNO (XEXP (XEXP (x, 0), 0)));
        !          1128:          else
        !          1129:            output_address (XEXP (x, 0));
        !          1130:        }
        !          1131:       else
        !          1132:        output_addr_const (file, x);
        !          1133:       break;
        !          1134: 
        !          1135:     default:
        !          1136:       output_operand_lossage ("invalid %%xn code");
        !          1137:     }
        !          1138: }
        !          1139: 
        !          1140: /* Print the address of an operand.  */
        !          1141: 
        !          1142: void
        !          1143: print_operand_address (file, x)
        !          1144:      FILE *file;
        !          1145:      register rtx x;
        !          1146: {
        !          1147:   if (GET_CODE (x) == REG)
        !          1148:     fprintf (file, "0(%d)", REGNO (x));
        !          1149:   else if (GET_CODE (x) == SYMBOL_REF || GET_CODE (x) == CONST)
        !          1150:     {
        !          1151:       output_addr_const (file, x);
        !          1152:       fprintf (file, "(2)");
        !          1153:     }
        !          1154:   else if (GET_CODE (x) == PLUS && GET_CODE (XEXP (x, 1)) == REG)
        !          1155:     {
        !          1156:       if (REGNO (XEXP (x, 0)) == 0)
        !          1157:        fprintf (file, "%d,%d", REGNO (XEXP (x, 1)), REGNO (XEXP (x, 0)));
        !          1158:       else
        !          1159:        fprintf (file, "%d,%d", REGNO (XEXP (x, 0)), REGNO (XEXP (x, 1)));
        !          1160:     }
        !          1161:   else if (GET_CODE (x) == PLUS && GET_CODE (XEXP (x, 1)) == CONST_INT)
        !          1162:     fprintf (file, "%d(%d)", INTVAL (XEXP (x, 1)), REGNO (XEXP (x, 0)));
        !          1163:   else
        !          1164:     abort ();
        !          1165: }
        !          1166: 
        !          1167: /* This page contains routines that are used to determine what the function
        !          1168:    prologue and epilogue code will do and write them out.  */
        !          1169: 
        !          1170: /*  Return the first fixed-point register that is required to be saved. 32 if
        !          1171:     none.  */
        !          1172: 
        !          1173: int
        !          1174: first_reg_to_save ()
        !          1175: {
        !          1176:   int first_reg;
        !          1177: 
        !          1178:   /* Find lowest numbered live register.  */
        !          1179:   for (first_reg = 13; first_reg <= 31; first_reg++)
        !          1180:     if (regs_ever_live[first_reg])
        !          1181:       break;
        !          1182: 
        !          1183:   /* If profiling, then we must save/restore every register that contains
        !          1184:      a parameter before/after the .mcount call.  Use registers from 30 down
        !          1185:      to 23 to do this.  Don't use the frame pointer in reg 31.
        !          1186: 
        !          1187:      For now, save enough room for all of the parameter registers.  */
        !          1188:   if (profile_flag)
        !          1189:     if (first_reg > 23)
        !          1190:       first_reg = 23;
        !          1191: 
        !          1192:   return first_reg;
        !          1193: }
        !          1194: 
        !          1195: /* Similar, for FP regs.  */
        !          1196: 
        !          1197: int
        !          1198: first_fp_reg_to_save ()
        !          1199: {
        !          1200:   int first_reg;
        !          1201: 
        !          1202:   /* Find lowest numbered live register.  */
        !          1203:   for (first_reg = 14 + 32; first_reg <= 63; first_reg++)
        !          1204:     if (regs_ever_live[first_reg])
        !          1205:       break;
        !          1206: 
        !          1207:   return first_reg;
        !          1208: }
        !          1209: 
        !          1210: /* Return 1 if we need to save CR.  */
        !          1211: 
        !          1212: int
        !          1213: must_save_cr ()
        !          1214: {
        !          1215:   return regs_ever_live[70] || regs_ever_live[71] || regs_ever_live[72];
        !          1216: }
        !          1217: 
        !          1218: /* Compute the size of the save area in the stack, including the space for
        !          1219:    the fixed area.  */
        !          1220: 
        !          1221: int
        !          1222: rs6000_sa_size ()
        !          1223: {
        !          1224:   int size;
        !          1225:   int i;
        !          1226: 
        !          1227:   /* We have the six fixed words, plus the size of the register save 
        !          1228:      areas, rounded to a double-word.  */
        !          1229:   size = 6 + (32 - first_reg_to_save ()) + (64 - first_fp_reg_to_save ()) * 2;
        !          1230:   if (size & 1)
        !          1231:     size++;
        !          1232: 
        !          1233:   return size * 4;
        !          1234: }
        !          1235: 
        !          1236: /* Return non-zero if this function makes calls.  */
        !          1237: 
        !          1238: int
        !          1239: rs6000_makes_calls ()
        !          1240: {
        !          1241:   rtx insn;
        !          1242: 
        !          1243:   /* If we are profiling, we will be making a call to mcount.  */
        !          1244:   if (profile_flag)
        !          1245:     return 1;
        !          1246: 
        !          1247:   for (insn = get_insns (); insn; insn = next_insn (insn))
        !          1248:     if (GET_CODE (insn) == CALL_INSN)
        !          1249:       return 1;
        !          1250: 
        !          1251:   return 0;
        !          1252: }
        !          1253: 
        !          1254: /* Return non-zero if this function needs to push space on the stack.  */
        !          1255: 
        !          1256: int
        !          1257: rs6000_pushes_stack ()
        !          1258: {
        !          1259:   int total_size = (rs6000_sa_size () + get_frame_size ()
        !          1260:                    + current_function_outgoing_args_size);
        !          1261: 
        !          1262:   /* We need to push the stack if a frame pointer is needed (because the
        !          1263:      stack might be dynamically adjusted), if we are debugging, if the
        !          1264:      total stack size is more than 220 bytes, or if we make calls.  */
        !          1265: 
        !          1266:   return (frame_pointer_needed || write_symbols != NO_DEBUG
        !          1267:          || total_size > 220
        !          1268:          || rs6000_makes_calls ());
        !          1269: }
        !          1270: 
        !          1271: /* Write function prologue.  */
        !          1272: 
        !          1273: void
        !          1274: output_prolog (file, size)
        !          1275:      FILE *file;
        !          1276:      int size;
        !          1277: {
        !          1278:   int first_reg = first_reg_to_save ();
        !          1279:   int must_push = rs6000_pushes_stack ();
        !          1280:   int first_fp_reg = first_fp_reg_to_save ();
        !          1281:   int basic_size = rs6000_sa_size ();
        !          1282:   int total_size = (basic_size + size + current_function_outgoing_args_size);
        !          1283: 
        !          1284:   /* Round size to multiple of 8 bytes.  */
        !          1285:   total_size = (total_size + 7) & ~7;
        !          1286: 
        !          1287:   /* Write .extern for any function we will call to save and restore fp
        !          1288:      values.  */
        !          1289:   if (first_fp_reg < 62)
        !          1290:     fprintf (file, "\t.extern ._savef%d\n\t.extern ._restf%d\n",
        !          1291:             first_fp_reg - 32, first_fp_reg - 32);
        !          1292: 
        !          1293:   /* Write .extern for truncation routines, if needed.  */
        !          1294:   if (rs6000_trunc_used && ! trunc_defined)
        !          1295:     {
        !          1296:       fprintf (file, "\t.extern .itrunc\n\t.extern .uitrunc\n");
        !          1297:       trunc_defined = 1;
        !          1298:     }
        !          1299: 
        !          1300:   /* If we have to call a function to save fpr's, or if we are doing profiling,
        !          1301:      then we will be using LR.  */
        !          1302:   if (first_fp_reg < 62 || profile_flag)
        !          1303:     regs_ever_live[65] = 1;
        !          1304: 
        !          1305:   /* If we use the link register, get it into r0.  */
        !          1306:   if (regs_ever_live[65])
        !          1307:     fprintf (file, "\tmflr 0\n");
        !          1308: 
        !          1309:   /* If we need to save CR, put it into r12.  */
        !          1310:   if (must_save_cr ())
        !          1311:     fprintf (file, "\tmfcr 12\n");
        !          1312: 
        !          1313:   /* Do any required saving of fpr's.  If only one or two to save, do it
        !          1314:      ourself.  Otherwise, call function.  */
        !          1315:   if (first_fp_reg == 62)
        !          1316:     fprintf (file, "\tstfd 30,-16(1)\n\tstfd 31,-8(1)\n");
        !          1317:   else if (first_fp_reg == 63)
        !          1318:     fprintf (file, "\tstfd 31,-8(1)\n");
        !          1319:   else if (first_fp_reg != 64)
        !          1320:     fprintf (file, "\tbl ._savef%d\n\tcror 15,15,15\n", first_fp_reg - 32);
        !          1321: 
        !          1322:   /* Now save gpr's.  */
        !          1323:   if (first_reg == 31)
        !          1324:     fprintf (file, "\tst 31,%d(1)\n", -4 - (64 - first_fp_reg) * 8);
        !          1325:   else if (first_reg != 32)
        !          1326:     fprintf (file, "\tstm %d,%d(1)\n", first_reg,
        !          1327:             - (32 - first_reg) * 4 - (64 - first_fp_reg) * 8);
        !          1328: 
        !          1329:   /* Save lr if we used it.  */
        !          1330:   if (regs_ever_live[65])
        !          1331:     fprintf (file, "\tst 0,8(1)\n");
        !          1332: 
        !          1333:   /* Save CR if we use any that must be preserved.  */
        !          1334:   if (must_save_cr ())
        !          1335:     fprintf (file, "\tst 12,4(1)\n");
        !          1336: 
        !          1337:   /* Update stack and set back pointer.  */
        !          1338:   if (must_push)
        !          1339:     {
        !          1340:       if (total_size < 32767)
        !          1341:        fprintf (file, "\tstu 1,%d(1)\n", - total_size);
        !          1342:       else
        !          1343:        {
        !          1344:          fprintf (file, "\tcau 0,0,%d\n\toril 0,0,%d\n",
        !          1345:                   (total_size >> 16) & 0xffff, total_size & 0xffff);
        !          1346:          fprintf (file, "\tsf 12,0,1\n\tst 1,0(12)\n\toril 1,12,0\n");
        !          1347:        }
        !          1348:     }
        !          1349: 
        !          1350:   /* Set frame pointer, if needed.  */
        !          1351:   if (frame_pointer_needed)
        !          1352:     fprintf (file, "\toril 31,1,0\n");
        !          1353: }
        !          1354: 
        !          1355: /* Write function epilogue.  */
        !          1356: 
        !          1357: void
        !          1358: output_epilog (file, size)
        !          1359:      FILE *file;
        !          1360:      int size;
        !          1361: {
        !          1362:   int first_reg = first_reg_to_save ();
        !          1363:   int must_push = rs6000_pushes_stack ();
        !          1364:   int first_fp_reg = first_fp_reg_to_save ();
        !          1365:   int basic_size = rs6000_sa_size ();
        !          1366:   int total_size = (basic_size + size + current_function_outgoing_args_size);
        !          1367:   rtx insn = get_last_insn ();
        !          1368: 
        !          1369:   /* Round size to multiple of 8 bytes.  */
        !          1370:   total_size = (total_size + 7) & ~7;
        !          1371: 
        !          1372:   /* If the last insn was a BARRIER, we don't have to write anything except
        !          1373:      the trace table.  */
        !          1374:   if (GET_CODE (insn) == NOTE)
        !          1375:     insn = prev_nonnote_insn (insn);
        !          1376:   if (insn == 0 ||  GET_CODE (insn) != BARRIER)
        !          1377:     {
        !          1378:       /* If we have a frame pointer, a call to alloca,  or a large stack
        !          1379:         frame, restore the old stack pointer using the backchain.  Otherwise,
        !          1380:         we know what size to update it with.  */
        !          1381:       if (frame_pointer_needed || current_function_calls_alloca
        !          1382:          || total_size > 32767)
        !          1383:        fprintf (file, "\tl 1,0(1)\n");
        !          1384:       else if (must_push)
        !          1385:        fprintf (file, "\tai 1,1,%d\n", total_size);
        !          1386: 
        !          1387:       /* Get the old lr if we saved it.  */
        !          1388:       if (regs_ever_live[65])
        !          1389:        fprintf (file, "\tl 0,8(1)\n");
        !          1390: 
        !          1391:       /* Get the old cr if we saved it.  */
        !          1392:       if (must_save_cr ())
        !          1393:        fprintf (file, "\tl 12,4(1)\n");
        !          1394: 
        !          1395:       /* Set LR here to try to overlap restores below.  */
        !          1396:       if (regs_ever_live[65])
        !          1397:        fprintf (file, "\tmtlr 0\n");
        !          1398: 
        !          1399:       /* Restore gpr's.  */
        !          1400:       if (first_reg == 31)
        !          1401:        fprintf (file, "\tl 31,%d(1)\n", -4 - (64 - first_fp_reg) * 8);
        !          1402:       else if (first_reg != 32)
        !          1403:        fprintf (file, "\tlm %d,%d(1)\n", first_reg,
        !          1404:                 - (32 - first_reg) * 4 - (64 - first_fp_reg) * 8);
        !          1405: 
        !          1406:       /* Restore fpr's if we can do it without calling a function.  */
        !          1407:       if (first_fp_reg == 62)
        !          1408:        fprintf (file, "\tlfd 30,-16(1)\n\tlfd 31,-8(1)\n");
        !          1409:       else if (first_fp_reg == 63)
        !          1410:        fprintf (file, "\tlfd 31,-8(1)\n");
        !          1411: 
        !          1412:       /* If we saved cr, restore it here.  Just those of cr2, cr3, and cr4
        !          1413:         that were used.  */
        !          1414:       if (must_save_cr ())
        !          1415:        fprintf (file, "\tmtcrf %d,12\n",
        !          1416:                 (regs_ever_live[70] != 0) * 0x20
        !          1417:                 + (regs_ever_live[71] != 0) * 0x10
        !          1418:                 + (regs_ever_live[72] != 0) * 0x8);
        !          1419: 
        !          1420:       /* If we have to restore more than two FP registers, branch to the
        !          1421:         restore function.  It will return to our caller.  */
        !          1422:       if (first_fp_reg < 62)
        !          1423:        fprintf (file, "\tb ._restf%d\n\tcror 15,15,15\n", first_fp_reg - 32);
        !          1424:       else
        !          1425:        fprintf (file, "\tbr\n");
        !          1426:     }
        !          1427: 
        !          1428:   /* Output a traceback table here.  See /usr/include/sys/debug.h for info
        !          1429:      on its format.  */
        !          1430:   {
        !          1431:     char *fname = XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0);
        !          1432:     int fixed_parms, float_parms, parm_info;
        !          1433:     int i;
        !          1434: 
        !          1435:     /* Need label immediately before tbtab, so we can compute its offset
        !          1436:        from the function start.  */
        !          1437:     if (*fname == '*')
        !          1438:       ++fname;
        !          1439:     fprintf (file, "LT..");
        !          1440:     ASM_OUTPUT_LABEL (file, fname);
        !          1441: 
        !          1442:     /* The .tbtab pseudo-op can only be used for the first eight
        !          1443:        expressions, since it can't handle the possibly variable length
        !          1444:        fields that follow.  However, if you omit the optional fields,
        !          1445:        the assembler outputs zeros for all optional fields anyways, giving each
        !          1446:        variable length field is minimum length (as defined in sys/debug.h).
        !          1447:        Thus we can not use the .tbtab pseudo-op at all.  */
        !          1448: 
        !          1449:     /* An all-zero word flags the start of the tbtab, for debuggers that have
        !          1450:        to find it by searching forward from the entry point or from the
        !          1451:        current pc.  */
        !          1452:     fprintf (file, "\t.long 0\n");
        !          1453: 
        !          1454:     /* Tbtab format type.  Use format type 0.  */
        !          1455:     fprintf (file, "\t.byte 0,");
        !          1456: 
        !          1457:     /* Language type.  Unfortunately, there doesn't seem to be any official way
        !          1458:        to get this info, so we use language_string.  C is 0.  C++ is 9.
        !          1459:        No number defined for Obj-C, so use the value for C for now.  */
        !          1460:     if (! strcmp (language_string, "GNU C")
        !          1461:        || ! strcmp (language_string, "GNU Obj-C"))
        !          1462:       i = 0;
        !          1463:     else if (! strcmp (language_string, "GNU F77"))
        !          1464:       i = 1;
        !          1465:     else if (! strcmp (language_string, "GNU Ada"))
        !          1466:       i = 3;
        !          1467:     else if (! strcmp (language_string, "GNU PASCAL"))
        !          1468:       i = 2;
        !          1469:     else if (! strcmp (language_string, "GNU C++"))
        !          1470:       i = 9;
        !          1471:     else
        !          1472:       abort ();
        !          1473:     fprintf (file, "%d,", i);
        !          1474: 
        !          1475:     /* 8 single bit fields: global linkage (not set for C extern linkage,
        !          1476:        apparently a PL/I convention?), out-of-line epilogue/prologue, offset
        !          1477:        from start of procedure stored in tbtab, internal function, function
        !          1478:        has controlled storage, function has no toc, function uses fp,
        !          1479:        function logs/aborts fp operations.  */
        !          1480:     /* Assume that fp operations are used if any fp reg must be saved.  */
        !          1481:     fprintf (file, "%d,", (1 << 5) | ((first_fp_reg != 64) << 1));
        !          1482: 
        !          1483:     /* 6 bitfields: function is interrupt handler, name present in proc table,
        !          1484:        function calls alloca, on condition directives (controls stack walks,
        !          1485:        3 bits), saves condition reg, saves link reg.  */
        !          1486:     /* The `function calls alloca' bit seems to be set whenever reg 31 is
        !          1487:        set up as a frame pointer, even when there is no alloca call.  */
        !          1488:     fprintf (file, "%d,",
        !          1489:             ((1 << 6) | (frame_pointer_needed << 5)
        !          1490:              | (must_save_cr () << 1) | (regs_ever_live[65])));
        !          1491: 
        !          1492:     /* 3 bitfields: saves backchain, spare bit, number of fpr saved
        !          1493:        (6 bits).  */
        !          1494:     fprintf (file, "%d,",
        !          1495:             (must_push << 7) | (64 - first_fp_reg_to_save ()));
        !          1496: 
        !          1497:     /* 2 bitfields: spare bits (2 bits), number of gpr saved (6 bits).  */
        !          1498:     fprintf (file, "%d,", (32 - first_reg_to_save ()));
        !          1499: 
        !          1500:     {
        !          1501:       /* Compute the parameter info from the function decl argument list.  */
        !          1502:       tree decl;
        !          1503:       int next_parm_info_bit;
        !          1504: 
        !          1505:       next_parm_info_bit = 31;
        !          1506:       parm_info = 0;
        !          1507:       fixed_parms = 0;
        !          1508:       float_parms = 0;
        !          1509: 
        !          1510:       for (decl = DECL_ARGUMENTS (current_function_decl);
        !          1511:           decl; decl = TREE_CHAIN (decl))
        !          1512:        {
        !          1513:          rtx parameter = DECL_INCOMING_RTL (decl);
        !          1514:          enum machine_mode mode = GET_MODE (parameter);
        !          1515: 
        !          1516:          if (GET_CODE (parameter) == REG)
        !          1517:            {
        !          1518:              if (GET_MODE_CLASS (mode) == MODE_FLOAT)
        !          1519:                {
        !          1520:                  int bits;
        !          1521: 
        !          1522:                  float_parms++;
        !          1523: 
        !          1524:                  if (mode == SFmode)
        !          1525:                    bits = 0x2;
        !          1526:                  else if (mode == DFmode)
        !          1527:                    bits = 0x3;
        !          1528:                  else
        !          1529:                    abort ();
        !          1530: 
        !          1531:                  /* If only one bit will fit, don't or in this entry.  */
        !          1532:                  if (next_parm_info_bit > 0)
        !          1533:                    parm_info |= (bits << (next_parm_info_bit - 1));
        !          1534:                  next_parm_info_bit -= 2;
        !          1535:                }
        !          1536:              else
        !          1537:                {
        !          1538:                  fixed_parms += ((GET_MODE_SIZE (mode) + (UNITS_PER_WORD - 1))
        !          1539:                                  / UNITS_PER_WORD);
        !          1540:                  next_parm_info_bit -= 1;
        !          1541:                }
        !          1542:            }
        !          1543:        }
        !          1544:     }
        !          1545: 
        !          1546:     /* Number of fixed point parameters.  */
        !          1547:     /* This is actually the number of words of fixed point parameters; thus
        !          1548:        an 8 byte struct counts as 2; and thus the maximum value is 8.  */
        !          1549:     fprintf (file, "%d,", fixed_parms);
        !          1550: 
        !          1551:     /* 2 bitfields: number of floating point parameters (7 bits), parameters
        !          1552:        all on stack.  */
        !          1553:     /* This is actually the number of fp registers that hold parameters;
        !          1554:        and thus the maximum value is 13.  */
        !          1555:     /* Set parameters on stack bit if parameters are not in their original
        !          1556:        registers, regardless of whether they are on the stack?  Xlc
        !          1557:        seems to set the bit when not optimizing.  */
        !          1558:     fprintf (file, "%d\n", ((float_parms << 1) | (! optimize)));
        !          1559: 
        !          1560:     /* Optional fields follow.  Some are variable length.  */
        !          1561: 
        !          1562:     /* Parameter types, left adjusted bit fields: 0 fixed, 10 single float,
        !          1563:        11 double float.  */
        !          1564:     /* There is an entry for each parameter in a register, in the order that
        !          1565:        they occur in the parameter list.  Any intervening arguments on the
        !          1566:        stack are ignored.  If the list overflows a long (max possible length
        !          1567:        34 bits) then completely leave off all elements that don't fit.  */
        !          1568:     /* Only emit this long if there was at least one parameter.  */
        !          1569:     if (fixed_parms || float_parms)
        !          1570:       fprintf (file, "\t.long %d\n", parm_info);
        !          1571: 
        !          1572:     /* Offset from start of code to tb table.  */
        !          1573:     fprintf (file, "\t.long LT..");
        !          1574:     RS6000_OUTPUT_BASENAME (file, fname);
        !          1575:     fprintf (file, "-.");
        !          1576:     RS6000_OUTPUT_BASENAME (file, fname);
        !          1577:     fprintf (file, "\n");
        !          1578: 
        !          1579:     /* Interrupt handler mask.  */
        !          1580:     /* Omit this long, since we never set the interrupt handler bit above.  */
        !          1581: 
        !          1582:     /* Number of CTL (controlled storage) anchors.  */
        !          1583:     /* Omit this long, since the has_ctl bit is never set above.  */
        !          1584: 
        !          1585:     /* Displacement into stack of each CTL anchor.  */
        !          1586:     /* Omit this list of longs, because there are no CTL anchors.  */
        !          1587: 
        !          1588:     /* Length of function name.  */
        !          1589:     fprintf (file, "\t.short %d\n", strlen (fname));
        !          1590: 
        !          1591:     /* Function name.  */
        !          1592:     assemble_string (fname, strlen (fname));
        !          1593: 
        !          1594:     /* Register for alloca automatic storage; this is always reg 31.
        !          1595:        Only emit this if the alloca bit was set above.  */
        !          1596:     if (frame_pointer_needed)
        !          1597:       fprintf (file, "\t.byte 31\n");
        !          1598:   }
        !          1599: }
        !          1600: 
        !          1601: /* Output a TOC entry.  We derive the entry name from what is
        !          1602:    being written.  */
        !          1603: 
        !          1604: void
        !          1605: output_toc (file, x, labelno)
        !          1606:      FILE *file;
        !          1607:      rtx x;
        !          1608:      int labelno;
        !          1609: {
        !          1610:   char buf[256];
        !          1611:   char *name = buf;
        !          1612:   rtx base = x;
        !          1613:   int offset = 0;
        !          1614: 
        !          1615:   ASM_OUTPUT_INTERNAL_LABEL (file, "LC", labelno);
        !          1616: 
        !          1617:   /* Handle FP constants specially.  */
        !          1618:   if (GET_CODE (x) == CONST_DOUBLE
        !          1619:       && GET_MODE (x) == DFmode
        !          1620:       && TARGET_FLOAT_FORMAT == HOST_FLOAT_FORMAT
        !          1621:       && BITS_PER_WORD == HOST_BITS_PER_INT
        !          1622:       && TARGET_FP_IN_TOC)
        !          1623:     {
        !          1624:       fprintf (file, "\t.tc FD_%x_%x[TC],%d,%d\n",
        !          1625:               CONST_DOUBLE_LOW (x), CONST_DOUBLE_HIGH (x),
        !          1626:               CONST_DOUBLE_LOW (x), CONST_DOUBLE_HIGH (x));
        !          1627:       return;
        !          1628:     }
        !          1629:   else if (GET_CODE (x) == CONST_DOUBLE && GET_MODE (x) == SFmode
        !          1630:           && TARGET_FP_IN_TOC)
        !          1631:     {
        !          1632:       rtx val = operand_subword (x, 0, 0, SFmode);
        !          1633: 
        !          1634:       if (val == 0 || GET_CODE (val) != CONST_INT)
        !          1635:        abort ();
        !          1636: 
        !          1637:       fprintf (file, "\t.tc FS_%x[TC],%d\n", INTVAL (val), INTVAL (val));
        !          1638:       return;
        !          1639:     }
        !          1640: 
        !          1641:   if (GET_CODE (x) == CONST)
        !          1642:     {
        !          1643:       base = XEXP (XEXP (x, 0), 0);
        !          1644:       offset = INTVAL (XEXP (XEXP (x, 0), 1));
        !          1645:     }
        !          1646:   
        !          1647:   if (GET_CODE (base) == SYMBOL_REF)
        !          1648:     name = XSTR (base, 0);
        !          1649:   else if (GET_CODE (base) == LABEL_REF)
        !          1650:     ASM_GENERATE_INTERNAL_LABEL (buf, "L", CODE_LABEL_NUMBER (XEXP (base, 0)));
        !          1651:   else if (GET_CODE (base) == CODE_LABEL)
        !          1652:     ASM_GENERATE_INTERNAL_LABEL (buf, "L", CODE_LABEL_NUMBER (base));
        !          1653:   else
        !          1654:     abort ();
        !          1655: 
        !          1656:   fprintf (file, "\t.tc ");
        !          1657:   RS6000_OUTPUT_BASENAME (file, name);
        !          1658: 
        !          1659:   if (offset < 0)
        !          1660:     fprintf (file, ".N%d", - offset);
        !          1661:   else if (offset)
        !          1662:     fprintf (file, ".P%d", offset);
        !          1663: 
        !          1664:   fprintf (file, "[TC],");
        !          1665:   output_addr_const (file, x);
        !          1666:   fprintf (file, "\n");
        !          1667: }
        !          1668: 
        !          1669: /* Output an assembler pseudo-op to write an ASCII string of N characters
        !          1670:    starting at P to FILE.
        !          1671: 
        !          1672:    On the RS/6000, we have to do this using the .byte operation and
        !          1673:    write out special characters outside the quoted string.
        !          1674:    Also, the assembler is broken; very long strings are truncated,
        !          1675:    so we must artificially break them up early. */
        !          1676: 
        !          1677: void
        !          1678: output_ascii (file, p, n)
        !          1679:      FILE *file;
        !          1680:      char *p;
        !          1681:      int n;
        !          1682: {
        !          1683:   char c;
        !          1684:   int i, count_string;
        !          1685:   char *for_string = "\t.byte \"";
        !          1686:   char *for_decimal = "\t.byte ";
        !          1687:   char *to_close = NULL;
        !          1688: 
        !          1689:   count_string = 0;
        !          1690:   for (i = 0; i < n; i++)
        !          1691:     {
        !          1692:       c = *p++;
        !          1693:       if (c >= ' ' && c < 0177)
        !          1694:        {
        !          1695:          if (for_string)
        !          1696:            fputs (for_string, file);
        !          1697:          putc (c, file);
        !          1698: 
        !          1699:          /* Write two quotes to get one.  */
        !          1700:          if (c == '"')
        !          1701:            {
        !          1702:              putc (c, file);
        !          1703:              ++count_string;
        !          1704:            }
        !          1705: 
        !          1706:          for_string = NULL;
        !          1707:          for_decimal = "\"\n\t.byte ";
        !          1708:          to_close = "\"\n";
        !          1709:          ++count_string;
        !          1710: 
        !          1711:          if (count_string >= 512)
        !          1712:            {
        !          1713:              fputs (to_close, file);
        !          1714: 
        !          1715:              for_string = "\t.byte \"";
        !          1716:              for_decimal = "\t.byte ";
        !          1717:              to_close = NULL;
        !          1718:              count_string = 0;
        !          1719:            }
        !          1720:        }
        !          1721:       else
        !          1722:        {
        !          1723:          if (for_decimal)
        !          1724:            fputs (for_decimal, file);
        !          1725:          fprintf (file, "%d", c);
        !          1726: 
        !          1727:          for_string = "\n\t.byte \"";
        !          1728:          for_decimal = ", ";
        !          1729:          to_close = "\n";
        !          1730:          count_string = 0;
        !          1731:        }
        !          1732:     }
        !          1733: 
        !          1734:   /* Now close the string if we have written one.  Then end the line.  */
        !          1735:   if (to_close)
        !          1736:     fprintf (file, to_close);
        !          1737: }
        !          1738: 
        !          1739: /* Generate a unique section name for FILENAME for a section type
        !          1740:    represented by SECTION_DESC.  Output goes into BUF.
        !          1741: 
        !          1742:    SECTION_DESC can be any string, as long as it is different for each
        !          1743:    possible section type.
        !          1744: 
        !          1745:    We name the section in the same manner as xlc.  The name begins with an
        !          1746:    underscore followed by the filename (after stripping any leading directory
        !          1747:    names) with the last period replaced by the string SECTION_DESC.  If
        !          1748:    FILENAME does not contain a period, SECTION_DESC is appended to the end of
        !          1749:    the name.  */
        !          1750: 
        !          1751: void
        !          1752: rs6000_gen_section_name (buf, filename, section_desc)
        !          1753:      char **buf;
        !          1754:      char *filename;
        !          1755:      char *section_desc;
        !          1756: {
        !          1757:   char *q, *after_last_slash, *last_period;
        !          1758:   char *p;
        !          1759:   int len;
        !          1760: 
        !          1761:   after_last_slash = filename;
        !          1762:   for (q = filename; *q; q++)
        !          1763:     {
        !          1764:       if (*q == '/')
        !          1765:        after_last_slash = q + 1;
        !          1766:       else if (*q == '.')
        !          1767:        last_period = q;
        !          1768:     }
        !          1769: 
        !          1770:   len = strlen (after_last_slash) + strlen (section_desc) + 2;
        !          1771:   *buf = (char *) permalloc (len);
        !          1772: 
        !          1773:   p = *buf;
        !          1774:   *p++ = '_';
        !          1775: 
        !          1776:   for (q = after_last_slash; *q; q++)
        !          1777:     {
        !          1778:       if (q == last_period)
        !          1779:         {
        !          1780:          strcpy (p, section_desc);
        !          1781:          p += strlen (section_desc);
        !          1782:         }
        !          1783: 
        !          1784:       else if (isalnum (*q))
        !          1785:         *p++ = *q;
        !          1786:     }
        !          1787: 
        !          1788:   if (last_period == 0)
        !          1789:     strcpy (p, section_desc);
        !          1790:   else
        !          1791:     *p = '\0';
        !          1792: }
        !          1793: 
        !          1794: /* Write function profiler code. */
        !          1795: 
        !          1796: void
        !          1797: output_function_profiler (file, labelno)
        !          1798:   FILE *file;
        !          1799:   int labelno;
        !          1800: {
        !          1801:   /* The last used parameter register.  */
        !          1802:   int last_parm_reg;
        !          1803:   int i, j;
        !          1804: 
        !          1805:   /* Set up a TOC entry for the profiler label.  */
        !          1806:   toc_section ();
        !          1807:   fprintf (file, "LPC..%d:\n\t.tc\tLP..%d[TC],LP..%d\n",
        !          1808:           labelno, labelno, labelno);
        !          1809:   text_section ();
        !          1810: 
        !          1811:   /* Figure out last used parameter register.  The proper thing to do is
        !          1812:      to walk incoming args of the function.  A function might have live
        !          1813:      parameter registers even if it has no incoming args.  */
        !          1814: 
        !          1815:   for (last_parm_reg = 10;
        !          1816:        last_parm_reg > 2 && ! regs_ever_live [last_parm_reg];
        !          1817:        last_parm_reg--)
        !          1818:     ;
        !          1819: 
        !          1820:   /* Save parameter registers in regs 23-30.  Don't overwrite reg 31, since
        !          1821:      it might be set up as the frame pointer.  */
        !          1822: 
        !          1823:   for (i = 3, j = 30; i <= last_parm_reg; i++, j--)
        !          1824:     fprintf (file, "\tai %d,%d,0\n", j, i);
        !          1825: 
        !          1826:   /* Load location address into r3, and call mcount.  */
        !          1827: 
        !          1828:   fprintf (file, "\tl 3,LPC..%d(2)\n\tbl .mcount\n", labelno);
        !          1829: 
        !          1830:   /* Restore parameter registers.  */
        !          1831: 
        !          1832:   for (i = 3, j = 30; i <= last_parm_reg; i++, j--)
        !          1833:     fprintf (file, "\tai %d,%d,0\n", i, j);
        !          1834: }

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