gcc/genemit.c

   1 /* Generate code from machine description to emit insns as rtl.
   2    Copyright (C) 1987, 1988, 1991, 1994, 1995, 1997, 1998, 1999, 2000, 2001
   3    Free Software Foundation, Inc.
   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, 59 Temple Place - Suite 330,
  20 Boston, MA 02111-1307, USA.  */
  21
  22
  23 #include "hconfig.h"
  24 #include "system.h"
  25 #include "rtl.h"
  26 #include "errors.h"
  27 #include "gensupport.h"
  28
  29
  30 static int max_opno;
  31 static int max_dup_opno;
  32 static int max_scratch_opno;
  33 static int register_constraints;
  34 static int insn_code_number;
  35 static int insn_index_number;
  36
  37 /* Data structure for recording the patterns of insns that have CLOBBERs.
  38    We use this to output a function that adds these CLOBBERs to a
  39    previously-allocated PARALLEL expression.  */
  40
  41 struct clobber_pat
  42 {
  43   struct clobber_ent *insns;
  44   rtx pattern;
  45   int first_clobber;
  46   struct clobber_pat *next;
  47   int has_hard_reg;
  48 } *clobber_list;
  49
  50 /* Records one insn that uses the clobber list.  */
  51
  52 struct clobber_ent
  53 {
  54   int code_number;              /* Counts only insns.  */
  55   struct clobber_ent *next;
  56 };
  57
  58 static void max_operand_1               PARAMS ((rtx));
  59 static int max_operand_vec              PARAMS ((rtx, int));
  60 static void print_code                  PARAMS ((RTX_CODE));
  61 static void gen_exp                     PARAMS ((rtx, enum rtx_code));
  62 static void gen_insn                    PARAMS ((rtx));
  63 static void gen_expand                  PARAMS ((rtx));
  64 static void gen_split                   PARAMS ((rtx));
  65 static void output_add_clobbers         PARAMS ((void));
  66 static void output_added_clobbers_hard_reg_p PARAMS ((void));
  67 static void gen_rtx_scratch             PARAMS ((rtx, enum rtx_code));
  68 static void output_peephole2_scratches  PARAMS ((rtx));
  69
  70 \f
  71 static void
  72 max_operand_1 (x)
  73      rtx x;
  74 {
  75   register RTX_CODE code;
  76   register int i;
  77   register int len;
  78   register const char *fmt;
  79
  80   if (x == 0)
  81     return;
  82
  83   code = GET_CODE (x);
  84
  85   if (code == MATCH_OPERAND && XSTR (x, 2) != 0 && *XSTR (x, 2) != '\0')
  86     register_constraints = 1;
  87   if (code == MATCH_SCRATCH && XSTR (x, 1) != 0 && *XSTR (x, 1) != '\0')
  88     register_constraints = 1;
  89   if (code == MATCH_OPERAND || code == MATCH_OPERATOR
  90       || code == MATCH_PARALLEL)
  91     max_opno = MAX (max_opno, XINT (x, 0));
  92   if (code == MATCH_DUP || code == MATCH_OP_DUP || code == MATCH_PAR_DUP)
  93     max_dup_opno = MAX (max_dup_opno, XINT (x, 0));
  94   if (code == MATCH_SCRATCH)
  95     max_scratch_opno = MAX (max_scratch_opno, XINT (x, 0));
  96
  97   fmt = GET_RTX_FORMAT (code);
  98   len = GET_RTX_LENGTH (code);
  99   for (i = 0; i < len; i++)
 100     {
 101       if (fmt[i] == 'e' || fmt[i] == 'u')
 102         max_operand_1 (XEXP (x, i));
 103       else if (fmt[i] == 'E')
 104         {
 105           int j;
 106           for (j = 0; j < XVECLEN (x, i); j++)
 107             max_operand_1 (XVECEXP (x, i, j));
 108         }
 109     }
 110 }
 111
 112 static int
 113 max_operand_vec (insn, arg)
 114      rtx insn;
 115      int arg;
 116 {
 117   register int len = XVECLEN (insn, arg);
 118   register int i;
 119
 120   max_opno = -1;
 121   max_dup_opno = -1;
 122   max_scratch_opno = -1;
 123
 124   for (i = 0; i < len; i++)
 125     max_operand_1 (XVECEXP (insn, arg, i));
 126
 127   return max_opno + 1;
 128 }
 129 \f
 130 static void
 131 print_code (code)
 132      RTX_CODE code;
 133 {
 134   register const char *p1;
 135   for (p1 = GET_RTX_NAME (code); *p1; p1++)
 136     putchar (TOUPPER(*p1));
 137 }
 138
 139 static void
 140 gen_rtx_scratch (x, subroutine_type)
 141      rtx x;
 142      enum rtx_code subroutine_type;
 143 {
 144   if (subroutine_type == DEFINE_PEEPHOLE2)
 145     {
 146       printf ("operand%d", XINT (x, 0));
 147     }
 148   else
 149     {
 150       printf ("gen_rtx_SCRATCH (%smode)", GET_MODE_NAME (GET_MODE (x)));
 151     }
 152 }
 153
 154 /* Print a C expression to construct an RTX just like X,
 155    substituting any operand references appearing within.  */
 156
 157 static void
 158 gen_exp (x, subroutine_type)
 159      rtx x;
 160      enum rtx_code subroutine_type;
 161 {
 162   register RTX_CODE code;
 163   register int i;
 164   register int len;
 165   register const char *fmt;
 166
 167   if (x == 0)
 168     {
 169       printf ("NULL_RTX");
 170       return;
 171     }
 172
 173   code = GET_CODE (x);
 174
 175   switch (code)
 176     {
 177     case MATCH_OPERAND:
 178     case MATCH_DUP:
 179       printf ("operand%d", XINT (x, 0));
 180       return;
 181
 182     case MATCH_OP_DUP:
 183       printf ("gen_rtx (GET_CODE (operand%d), ", XINT (x, 0));
 184       if (GET_MODE (x) == VOIDmode)
 185         printf ("GET_MODE (operand%d)", XINT (x, 0));
 186       else
 187         printf ("%smode", GET_MODE_NAME (GET_MODE (x)));
 188       for (i = 0; i < XVECLEN (x, 1); i++)
 189         {
 190           printf (",\n\t\t");
 191           gen_exp (XVECEXP (x, 1, i), subroutine_type);
 192         }
 193       printf (")");
 194       return;
 195
 196     case MATCH_OPERATOR:
 197       printf ("gen_rtx (GET_CODE (operand%d)", XINT (x, 0));
 198       printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
 199       for (i = 0; i < XVECLEN (x, 2); i++)
 200         {
 201           printf (",\n\t\t");
 202           gen_exp (XVECEXP (x, 2, i), subroutine_type);
 203         }
 204       printf (")");
 205       return;
 206
 207     case MATCH_PARALLEL:
 208     case MATCH_PAR_DUP:
 209       printf ("operand%d", XINT (x, 0));
 210       return;
 211
 212     case MATCH_SCRATCH:
 213       gen_rtx_scratch (x, subroutine_type);
 214       return;
 215
 216     case ADDRESS:
 217       fatal ("ADDRESS expression code used in named instruction pattern");
 218
 219     case PC:
 220       printf ("pc_rtx");
 221       return;
 222
 223     case CC0:
 224       printf ("cc0_rtx");
 225       return;
 226
 227     case CONST_INT:
 228       if (INTVAL (x) == 0)
 229         printf ("const0_rtx");
 230       else if (INTVAL (x) == 1)
 231         printf ("const1_rtx");
 232       else if (INTVAL (x) == -1)
 233         printf ("constm1_rtx");
 234       else if (INTVAL (x) == STORE_FLAG_VALUE)
 235         printf ("const_true_rtx");
 236       else
 237         {
 238           printf ("GEN_INT (");
 239           printf (HOST_WIDE_INT_PRINT_DEC, INTVAL (x));
 240           printf (")");
 241         }
 242       return;
 243
 244     case CONST_DOUBLE:
 245       /* These shouldn't be written in MD files.  Instead, the appropriate
 246          routines in varasm.c should be called.  */
 247       abort ();
 248
 249     default:
 250       break;
 251     }
 252
 253   printf ("gen_rtx_");
 254   print_code (code);
 255   printf (" (%smode", GET_MODE_NAME (GET_MODE (x)));
 256
 257   fmt = GET_RTX_FORMAT (code);
 258   len = GET_RTX_LENGTH (code);
 259   for (i = 0; i < len; i++)
 260     {
 261       if (fmt[i] == '0')
 262         break;
 263       printf (",\n\t");
 264       if (fmt[i] == 'e' || fmt[i] == 'u')
 265         gen_exp (XEXP (x, i), subroutine_type);
 266       else if (fmt[i] == 'i')
 267         printf ("%u", XINT (x, i));
 268       else if (fmt[i] == 's')
 269         printf ("\"%s\"", XSTR (x, i));
 270       else if (fmt[i] == 'E')
 271         {
 272           int j;
 273           printf ("gen_rtvec (%d", XVECLEN (x, i));
 274           for (j = 0; j < XVECLEN (x, i); j++)
 275             {
 276               printf (",\n\t\t");
 277               gen_exp (XVECEXP (x, i, j), subroutine_type);
 278             }
 279           printf (")");
 280         }
 281       else
 282         abort ();
 283     }
 284   printf (")");
 285 }
 286 \f
 287 /* Generate the `gen_...' function for a DEFINE_INSN.  */
 288
 289 static void
 290 gen_insn (insn)
 291      rtx insn;
 292 {
 293   int operands;
 294   register int i;
 295
 296   /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
 297      registers or MATCH_SCRATCHes.  If so, store away the information for
 298      later.  */
 299
 300   if (XVEC (insn, 1))
 301     {
 302       int has_hard_reg = 0;
 303
 304       for (i = XVECLEN (insn, 1) - 1; i > 0; i--)
 305         {
 306           if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER)
 307             break;
 308
 309           if (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) == REG)
 310             has_hard_reg = 1;
 311           else if (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH)
 312             break;
 313         }
 314
 315       if (i != XVECLEN (insn, 1) - 1)
 316         {
 317           register struct clobber_pat *p;
 318           register struct clobber_ent *link
 319             = (struct clobber_ent *) xmalloc (sizeof (struct clobber_ent));
 320           register int j;
 321
 322           link->code_number = insn_code_number;
 323
 324           /* See if any previous CLOBBER_LIST entry is the same as this
 325              one.  */
 326
 327           for (p = clobber_list; p; p = p->next)
 328             {
 329               if (p->first_clobber != i + 1
 330                   || XVECLEN (p->pattern, 1) != XVECLEN (insn, 1))
 331                 continue;
 332
 333               for (j = i + 1; j < XVECLEN (insn, 1); j++)
 334                 {
 335                   rtx old = XEXP (XVECEXP (p->pattern, 1, j), 0);
 336                   rtx new = XEXP (XVECEXP (insn, 1, j), 0);
 337
 338                   /* OLD and NEW are the same if both are to be a SCRATCH
 339                      of the same mode,
 340                      or if both are registers of the same mode and number.  */
 341                   if (! (GET_MODE (old) == GET_MODE (new)
 342                          && ((GET_CODE (old) == MATCH_SCRATCH
 343                               && GET_CODE (new) == MATCH_SCRATCH)
 344                              || (GET_CODE (old) == REG && GET_CODE (new) == REG
 345                                  && REGNO (old) == REGNO (new)))))
 346                     break;
 347                 }
 348
 349               if (j == XVECLEN (insn, 1))
 350                 break;
 351             }
 352
 353           if (p == 0)
 354             {
 355               p = (struct clobber_pat *) xmalloc (sizeof (struct clobber_pat));
 356
 357               p->insns = 0;
 358               p->pattern = insn;
 359               p->first_clobber = i + 1;
 360               p->next = clobber_list;
 361               p->has_hard_reg = has_hard_reg;
 362               clobber_list = p;
 363             }
 364
 365           link->next = p->insns;
 366           p->insns = link;
 367         }
 368     }
 369
 370   /* Don't mention instructions whose names are the null string
 371      or begin with '*'.  They are in the machine description just
 372      to be recognized.  */
 373   if (XSTR (insn, 0)[0] == 0 || XSTR (insn, 0)[0] == '*')
 374     return;
 375
 376   /* Find out how many operands this function has,
 377      and also whether any of them have register constraints.  */
 378   register_constraints = 0;
 379   operands = max_operand_vec (insn, 1);
 380   if (max_dup_opno >= operands)
 381     fatal ("match_dup operand number has no match_operand");
 382
 383   /* Output the function name and argument declarations.  */
 384   printf ("rtx\ngen_%s (", XSTR (insn, 0));
 385   for (i = 0; i < operands; i++)
 386     if (i)
 387       printf (", operand%d", i);
 388     else
 389       printf ("operand%d", i);
 390   printf (")\n");
 391   for (i = 0; i < operands; i++)
 392     printf ("     rtx operand%d;\n", i);
 393   printf ("{\n");
 394
 395   /* Output code to construct and return the rtl for the instruction body */
 396
 397   if (XVECLEN (insn, 1) == 1)
 398     {
 399       printf ("  return ");
 400       gen_exp (XVECEXP (insn, 1, 0), DEFINE_INSN);
 401       printf (";\n}\n\n");
 402     }
 403   else
 404     {
 405       printf ("  return gen_rtx_PARALLEL (VOIDmode, gen_rtvec (%d",
 406               XVECLEN (insn, 1));
 407
 408       for (i = 0; i < XVECLEN (insn, 1); i++)
 409         {
 410           printf (",\n\t\t");
 411           gen_exp (XVECEXP (insn, 1, i), DEFINE_INSN);
 412         }
 413       printf ("));\n}\n\n");
 414     }
 415 }
 416 \f
 417 /* Generate the `gen_...' function for a DEFINE_EXPAND.  */
 418
 419 static void
 420 gen_expand (expand)
 421      rtx expand;
 422 {
 423   int operands;
 424   register int i;
 425
 426   if (strlen (XSTR (expand, 0)) == 0)
 427     fatal ("define_expand lacks a name");
 428   if (XVEC (expand, 1) == 0)
 429     fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0));
 430
 431   /* Find out how many operands this function has,
 432      and also whether any of them have register constraints.  */
 433   register_constraints = 0;
 434
 435   operands = max_operand_vec (expand, 1);
 436
 437   /* Output the function name and argument declarations.  */
 438   printf ("rtx\ngen_%s (", XSTR (expand, 0));
 439   for (i = 0; i < operands; i++)
 440     if (i)
 441       printf (", operand%d", i);
 442     else
 443       printf ("operand%d", i);
 444   printf (")\n");
 445   for (i = 0; i < operands; i++)
 446     printf ("     rtx operand%d;\n", i);
 447   printf ("{\n");
 448
 449   /* If we don't have any C code to write, only one insn is being written,
 450      and no MATCH_DUPs are present, we can just return the desired insn
 451      like we do for a DEFINE_INSN.  This saves memory.  */
 452   if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0')
 453       && operands > max_dup_opno
 454       && XVECLEN (expand, 1) == 1)
 455     {
 456       printf ("  return ");
 457       gen_exp (XVECEXP (expand, 1, 0), DEFINE_EXPAND);
 458       printf (";\n}\n\n");
 459       return;
 460     }
 461
 462   /* For each operand referred to only with MATCH_DUPs,
 463      make a local variable.  */
 464   for (i = operands; i <= max_dup_opno; i++)
 465     printf ("  rtx operand%d;\n", i);
 466   for (; i <= max_scratch_opno; i++)
 467     printf ("  rtx operand%d;\n", i);
 468   printf ("  rtx _val = 0;\n");
 469   printf ("  start_sequence ();\n");
 470
 471   /* The fourth operand of DEFINE_EXPAND is some code to be executed
 472      before the actual construction.
 473      This code expects to refer to `operands'
 474      just as the output-code in a DEFINE_INSN does,
 475      but here `operands' is an automatic array.
 476      So copy the operand values there before executing it.  */
 477   if (XSTR (expand, 3) && *XSTR (expand, 3))
 478     {
 479       printf ("  {\n");
 480       if (operands > 0 || max_dup_opno >= 0 || max_scratch_opno >= 0)
 481         printf ("    rtx operands[%d];\n",
 482             MAX (operands, MAX (max_scratch_opno, max_dup_opno) + 1));
 483       /* Output code to copy the arguments into `operands'.  */
 484       for (i = 0; i < operands; i++)
 485         printf ("    operands[%d] = operand%d;\n", i, i);
 486
 487       /* Output the special code to be executed before the sequence
 488          is generated.  */
 489       printf ("%s\n", XSTR (expand, 3));
 490
 491       /* Output code to copy the arguments back out of `operands'
 492          (unless we aren't going to use them at all).  */
 493       if (XVEC (expand, 1) != 0)
 494         {
 495           for (i = 0; i < operands; i++)
 496             printf ("    operand%d = operands[%d];\n", i, i);
 497           for (; i <= max_dup_opno; i++)
 498             printf ("    operand%d = operands[%d];\n", i, i);
 499           for (; i <= max_scratch_opno; i++)
 500             printf ("    operand%d = operands[%d];\n", i, i);
 501         }
 502       printf ("  }\n");
 503     }
 504
 505   /* Output code to construct the rtl for the instruction bodies.
 506      Use emit_insn to add them to the sequence being accumulated.
 507      But don't do this if the user's code has set `no_more' nonzero.  */
 508
 509   for (i = 0; i < XVECLEN (expand, 1); i++)
 510     {
 511       rtx next = XVECEXP (expand, 1, i);
 512       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 513           || (GET_CODE (next) == PARALLEL
 514               && GET_CODE (XVECEXP (next, 0, 0)) == SET
 515               && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 516           || GET_CODE (next) == RETURN)
 517         printf ("  emit_jump_insn (");
 518       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 519                || GET_CODE (next) == CALL
 520                || (GET_CODE (next) == PARALLEL
 521                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 522                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 523                || (GET_CODE (next) == PARALLEL
 524                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 525         printf ("  emit_call_insn (");
 526       else if (GET_CODE (next) == CODE_LABEL)
 527         printf ("  emit_label (");
 528       else if (GET_CODE (next) == MATCH_OPERAND
 529                || GET_CODE (next) == MATCH_DUP
 530                || GET_CODE (next) == MATCH_OPERATOR
 531                || GET_CODE (next) == MATCH_OP_DUP
 532                || GET_CODE (next) == MATCH_PARALLEL
 533                || GET_CODE (next) == MATCH_PAR_DUP
 534                || GET_CODE (next) == PARALLEL)
 535         printf ("  emit (");
 536       else
 537         printf ("  emit_insn (");
 538       gen_exp (next, DEFINE_EXPAND);
 539       printf (");\n");
 540       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 541           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 542         printf ("  emit_barrier ();");
 543     }
 544
 545   /* Call `gen_sequence' to make a SEQUENCE out of all the
 546      insns emitted within this gen_... function.  */
 547
 548   printf ("  _val = gen_sequence ();\n");
 549   printf ("  end_sequence ();\n");
 550   printf ("  return _val;\n}\n\n");
 551 }
 552
 553 /* Like gen_expand, but generates a SEQUENCE.  */
 554
 555 static void
 556 gen_split (split)
 557      rtx split;
 558 {
 559   register int i;
 560   int operands;
 561   const char *name = "split";
 562   const char *unused;
 563
 564   if (GET_CODE (split) == DEFINE_PEEPHOLE2)
 565     name = "peephole2";
 566
 567   if (XVEC (split, 0) == 0)
 568     fatal ("define_%s (definition %d) lacks a pattern", name,
 569            insn_index_number);
 570   else if (XVEC (split, 2) == 0)
 571     fatal ("define_%s (definition %d) lacks a replacement pattern", name,
 572            insn_index_number);
 573
 574   /* Find out how many operands this function has.  */
 575
 576   max_operand_vec (split, 2);
 577   operands = MAX (max_opno, MAX (max_dup_opno, max_scratch_opno)) + 1;
 578   unused = (operands == 0 ? " ATTRIBUTE_UNUSED" : "");
 579
 580   /* Output the prototype, function name and argument declarations.  */
 581   if (GET_CODE (split) == DEFINE_PEEPHOLE2)
 582     {
 583       printf ("extern rtx gen_%s_%d PARAMS ((rtx, rtx *));\n",
 584               name, insn_code_number);
 585       printf ("rtx\ngen_%s_%d (curr_insn, operands)\n",
 586               name, insn_code_number);
 587       printf ("     rtx curr_insn ATTRIBUTE_UNUSED;\n");
 588       printf ("     rtx *operands%s;\n", unused);
 589     }
 590   else
 591     {
 592       printf ("extern rtx gen_split_%d PARAMS ((rtx *));\n", insn_code_number);
 593       printf ("rtx\ngen_%s_%d (operands)\n", name, insn_code_number);
 594       printf ("      rtx *operands%s;\n", unused);
 595     }
 596   printf ("{\n");
 597
 598   /* Declare all local variables.  */
 599   for (i = 0; i < operands; i++)
 600     printf ("  rtx operand%d;\n", i);
 601   printf ("  rtx _val = 0;\n");
 602
 603   if (GET_CODE (split) == DEFINE_PEEPHOLE2)
 604     output_peephole2_scratches (split);
 605
 606   printf ("  start_sequence ();\n");
 607
 608   /* The fourth operand of DEFINE_SPLIT is some code to be executed
 609      before the actual construction.  */
 610
 611   if (XSTR (split, 3))
 612     printf ("%s\n", XSTR (split, 3));
 613
 614   /* Output code to copy the arguments back out of `operands'  */
 615   for (i = 0; i < operands; i++)
 616     printf ("  operand%d = operands[%d];\n", i, i);
 617
 618   /* Output code to construct the rtl for the instruction bodies.
 619      Use emit_insn to add them to the sequence being accumulated.
 620      But don't do this if the user's code has set `no_more' nonzero.  */
 621
 622   for (i = 0; i < XVECLEN (split, 2); i++)
 623     {
 624       rtx next = XVECEXP (split, 2, i);
 625       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 626           || (GET_CODE (next) == PARALLEL
 627               && GET_CODE (XVECEXP (next, 0, 0)) == SET
 628               && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 629           || GET_CODE (next) == RETURN)
 630         printf ("  emit_jump_insn (");
 631       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 632                || GET_CODE (next) == CALL
 633                || (GET_CODE (next) == PARALLEL
 634                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 635                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 636                || (GET_CODE (next) == PARALLEL
 637                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 638         printf ("  emit_call_insn (");
 639       else if (GET_CODE (next) == CODE_LABEL)
 640         printf ("  emit_label (");
 641       else if (GET_CODE (next) == MATCH_OPERAND
 642                || GET_CODE (next) == MATCH_OPERATOR
 643                || GET_CODE (next) == MATCH_PARALLEL
 644                || GET_CODE (next) == MATCH_OP_DUP
 645                || GET_CODE (next) == MATCH_DUP
 646                || GET_CODE (next) == PARALLEL)
 647         printf ("  emit (");
 648       else
 649         printf ("  emit_insn (");
 650       gen_exp (next, GET_CODE (split));
 651       printf (");\n");
 652       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 653           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 654         printf ("  emit_barrier ();");
 655     }
 656
 657   /* Call `gen_sequence' to make a SEQUENCE out of all the
 658      insns emitted within this gen_... function.  */
 659
 660   printf ("  _val = gen_sequence ();\n");
 661   printf ("  end_sequence ();\n");
 662   printf ("  return _val;\n}\n\n");
 663 }
 664 \f
 665 /* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
 666    size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
 667    the end of the vector.  */
 668
 669 static void
 670 output_add_clobbers ()
 671 {
 672   struct clobber_pat *clobber;
 673   struct clobber_ent *ent;
 674   int i;
 675
 676   printf ("\n\nvoid\nadd_clobbers (pattern, insn_code_number)\n");
 677   printf ("     rtx pattern;\n     int insn_code_number;\n");
 678   printf ("{\n");
 679   printf ("  switch (insn_code_number)\n");
 680   printf ("    {\n");
 681
 682   for (clobber = clobber_list; clobber; clobber = clobber->next)
 683     {
 684       for (ent = clobber->insns; ent; ent = ent->next)
 685         printf ("    case %d:\n", ent->code_number);
 686
 687       for (i = clobber->first_clobber; i < XVECLEN (clobber->pattern, 1); i++)
 688         {
 689           printf ("      XVECEXP (pattern, 0, %d) = ", i);
 690           gen_exp (XVECEXP (clobber->pattern, 1, i),
 691                    GET_CODE (clobber->pattern));
 692           printf (";\n");
 693         }
 694
 695       printf ("      break;\n\n");
 696     }
 697
 698   printf ("    default:\n");
 699   printf ("      abort ();\n");
 700   printf ("    }\n");
 701   printf ("}\n");
 702 }
 703 \f
 704 /* Write a function, `added_clobbers_hard_reg_p' this is given an insn_code
 705    number that needs clobbers and returns 1 if they include a clobber of a
 706    hard reg and 0 if they just clobber SCRATCH.  */
 707
 708 static void
 709 output_added_clobbers_hard_reg_p ()
 710 {
 711   struct clobber_pat *clobber;
 712   struct clobber_ent *ent;
 713   int clobber_p;
 714
 715   printf ("\n\nint\nadded_clobbers_hard_reg_p (insn_code_number)\n");
 716   printf ("     int insn_code_number;\n");
 717   printf ("{\n");
 718   printf ("  switch (insn_code_number)\n");
 719   printf ("    {\n");
 720
 721   for (clobber_p = 0; clobber_p <= 1; clobber_p++)
 722     {
 723       for (clobber = clobber_list; clobber; clobber = clobber->next)
 724         if (clobber->has_hard_reg == clobber_p)
 725           for (ent = clobber->insns; ent; ent = ent->next)
 726             printf ("    case %d:\n", ent->code_number);
 727
 728       printf ("      return %d;\n\n", clobber_p);
 729     }
 730
 731   printf ("    default:\n");
 732   printf ("      abort ();\n");
 733   printf ("    }\n");
 734   printf ("}\n");
 735 }
 736 \f
 737 /* Generate code to invoke find_free_register () as needed for the
 738    scratch registers used by the peephole2 pattern in SPLIT. */
 739
 740 static void
 741 output_peephole2_scratches (split)
 742      rtx split;
 743 {
 744   int i;
 745   int insn_nr = 0;
 746
 747   printf ("  HARD_REG_SET _regs_allocated;\n");
 748   printf ("  CLEAR_HARD_REG_SET (_regs_allocated);\n");
 749
 750   for (i = 0; i < XVECLEN (split, 0); i++)
 751     {
 752       rtx elt = XVECEXP (split, 0, i);
 753       if (GET_CODE (elt) == MATCH_SCRATCH)
 754         {
 755           int last_insn_nr = insn_nr;
 756           int cur_insn_nr = insn_nr;
 757           int j;
 758           for (j = i + 1; j < XVECLEN (split, 0); j++)
 759             if (GET_CODE (XVECEXP (split, 0, j)) == MATCH_DUP)
 760               {
 761                 if (XINT (XVECEXP (split, 0, j), 0) == XINT (elt, 0))
 762                   last_insn_nr = cur_insn_nr;
 763               }
 764             else if (GET_CODE (XVECEXP (split, 0, j)) != MATCH_SCRATCH)
 765               cur_insn_nr++;
 766
 767           printf ("  if ((operands[%d] = peep2_find_free_register (%d, %d, \"%s\", %smode, &_regs_allocated)) == NULL_RTX)\n\
 768     return NULL;\n",
 769                   XINT (elt, 0),
 770                   insn_nr, last_insn_nr,
 771                   XSTR (elt, 1),
 772                   GET_MODE_NAME (GET_MODE (elt)));
 773
 774         }
 775       else if (GET_CODE (elt) != MATCH_DUP)
 776         insn_nr++;
 777     }
 778 }
 779
 780 extern int main PARAMS ((int, char **));
 781
 782 int
 783 main (argc, argv)
 784      int argc;
 785      char **argv;
 786 {
 787   rtx desc;
 788
 789   progname = "genemit";
 790
 791   if (argc <= 1)
 792     fatal ("No input file name.");
 793
 794   if (init_md_reader (argv[1]) != SUCCESS_EXIT_CODE)
 795     return (FATAL_EXIT_CODE);
 796
 797   /* Assign sequential codes to all entries in the machine description
 798      in parallel with the tables in insn-output.c.  */
 799
 800   insn_code_number = 0;
 801   insn_index_number = 0;
 802
 803   printf ("/* Generated automatically by the program `genemit'\n\
 804 from the machine description file `md'.  */\n\n");
 805
 806   printf ("#include \"config.h\"\n");
 807   printf ("#include \"system.h\"\n");
 808   printf ("#include \"rtl.h\"\n");
 809   printf ("#include \"tm_p.h\"\n");
 810   printf ("#include \"function.h\"\n");
 811   printf ("#include \"expr.h\"\n");
 812   printf ("#include \"real.h\"\n");
 813   printf ("#include \"flags.h\"\n");
 814   printf ("#include \"output.h\"\n");
 815   printf ("#include \"insn-config.h\"\n");
 816   printf ("#include \"hard-reg-set.h\"\n");
 817   printf ("#include \"recog.h\"\n");
 818   printf ("#include \"resource.h\"\n");
 819   printf ("#include \"reload.h\"\n");
 820   printf ("#include \"toplev.h\"\n");
 821   printf ("#include \"ggc.h\"\n\n");
 822   printf ("#define FAIL return (end_sequence (), _val)\n");
 823   printf ("#define DONE return (_val = gen_sequence (), end_sequence (), _val)\n");
 824
 825   /* Read the machine description.  */
 826
 827   while (1)
 828     {
 829       int line_no;
 830
 831       desc = read_md_rtx (&line_no, &insn_code_number);
 832       if (desc == NULL)
 833         break;
 834
 835       switch (GET_CODE (desc))
 836         {
 837           case DEFINE_INSN:
 838               gen_insn (desc);
 839               break;
 840
 841           case DEFINE_EXPAND:
 842               gen_expand (desc);
 843               break;
 844
 845           case DEFINE_SPLIT:
 846               gen_split (desc);
 847               break;
 848
 849           case DEFINE_PEEPHOLE2:
 850               gen_split (desc);
 851               break;
 852
 853           default:
 854               break;
 855          }
 856       ++insn_index_number;
 857     }
 858
 859   /* Write out the routines to add CLOBBERs to a pattern and say whether they
 860      clobber a hard reg.  */
 861   output_add_clobbers ();
 862   output_added_clobbers_hard_reg_p ();
 863
 864   fflush (stdout);
 865   return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
 866 }
 867
 868 /* Define this so we can link with print-rtl.o to get debug_rtx function.  */
 869 const char *
 870 get_insn_name (code)
 871      int code ATTRIBUTE_UNUSED;
 872 {
 873   return NULL;
 874 }