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 GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22
  23 #include "bconfig.h"
  24 #include "system.h"
  25 #include "coretypes.h"
  26 #include "tm.h"
  27 #include "rtl.h"
  28 #include "errors.h"
  29 #include "gensupport.h"
  30
  31
  32 static int max_opno;
  33 static int max_dup_opno;
  34 static int max_scratch_opno;
  35 static int register_constraints;
  36 static int insn_code_number;
  37 static int insn_index_number;
  38
  39 /* Data structure for recording the patterns of insns that have CLOBBERs.
  40    We use this to output a function that adds these CLOBBERs to a
  41    previously-allocated PARALLEL expression.  */
  42
  43 struct clobber_pat
  44 {
  45   struct clobber_ent *insns;
  46   rtx pattern;
  47   int first_clobber;
  48   struct clobber_pat *next;
  49   int has_hard_reg;
  50 } *clobber_list;
  51
  52 /* Records one insn that uses the clobber list.  */
  53
  54 struct clobber_ent
  55 {
  56   int code_number;              /* Counts only insns.  */
  57   struct clobber_ent *next;
  58 };
  59
  60 static void max_operand_1               PARAMS ((rtx));
  61 static int max_operand_vec              PARAMS ((rtx, int));
  62 static void print_code                  PARAMS ((RTX_CODE));
  63 static void gen_exp                     PARAMS ((rtx, enum rtx_code, char *));
  64 static void gen_insn                    PARAMS ((rtx, int));
  65 static void gen_expand                  PARAMS ((rtx));
  66 static void gen_split                   PARAMS ((rtx));
  67 static void output_add_clobbers         PARAMS ((void));
  68 static void output_added_clobbers_hard_reg_p PARAMS ((void));
  69 static void gen_rtx_scratch             PARAMS ((rtx, enum rtx_code));
  70 static void output_peephole2_scratches  PARAMS ((rtx));
  71
  72 \f
  73 static void
  74 max_operand_1 (x)
  75      rtx x;
  76 {
  77   RTX_CODE code;
  78   int i;
  79   int len;
  80   const char *fmt;
  81
  82   if (x == 0)
  83     return;
  84
  85   code = GET_CODE (x);
  86
  87   if (code == MATCH_OPERAND && XSTR (x, 2) != 0 && *XSTR (x, 2) != '\0')
  88     register_constraints = 1;
  89   if (code == MATCH_SCRATCH && XSTR (x, 1) != 0 && *XSTR (x, 1) != '\0')
  90     register_constraints = 1;
  91   if (code == MATCH_OPERAND || code == MATCH_OPERATOR
  92       || code == MATCH_PARALLEL)
  93     max_opno = MAX (max_opno, XINT (x, 0));
  94   if (code == MATCH_DUP || code == MATCH_OP_DUP || code == MATCH_PAR_DUP)
  95     max_dup_opno = MAX (max_dup_opno, XINT (x, 0));
  96   if (code == MATCH_SCRATCH)
  97     max_scratch_opno = MAX (max_scratch_opno, XINT (x, 0));
  98
  99   fmt = GET_RTX_FORMAT (code);
 100   len = GET_RTX_LENGTH (code);
 101   for (i = 0; i < len; i++)
 102     {
 103       if (fmt[i] == 'e' || fmt[i] == 'u')
 104         max_operand_1 (XEXP (x, i));
 105       else if (fmt[i] == 'E')
 106         {
 107           int j;
 108           for (j = 0; j < XVECLEN (x, i); j++)
 109             max_operand_1 (XVECEXP (x, i, j));
 110         }
 111     }
 112 }
 113
 114 static int
 115 max_operand_vec (insn, arg)
 116      rtx insn;
 117      int arg;
 118 {
 119   int len = XVECLEN (insn, arg);
 120   int i;
 121
 122   max_opno = -1;
 123   max_dup_opno = -1;
 124   max_scratch_opno = -1;
 125
 126   for (i = 0; i < len; i++)
 127     max_operand_1 (XVECEXP (insn, arg, i));
 128
 129   return max_opno + 1;
 130 }
 131 \f
 132 static void
 133 print_code (code)
 134      RTX_CODE code;
 135 {
 136   const char *p1;
 137   for (p1 = GET_RTX_NAME (code); *p1; p1++)
 138     putchar (TOUPPER(*p1));
 139 }
 140
 141 static void
 142 gen_rtx_scratch (x, subroutine_type)
 143      rtx x;
 144      enum rtx_code subroutine_type;
 145 {
 146   if (subroutine_type == DEFINE_PEEPHOLE2)
 147     {
 148       printf ("operand%d", XINT (x, 0));
 149     }
 150   else
 151     {
 152       printf ("gen_rtx_SCRATCH (%smode)", GET_MODE_NAME (GET_MODE (x)));
 153     }
 154 }
 155
 156 /* Print a C expression to construct an RTX just like X,
 157    substituting any operand references appearing within.  */
 158
 159 static void
 160 gen_exp (x, subroutine_type, used)
 161      rtx x;
 162      enum rtx_code subroutine_type;
 163      char *used;
 164 {
 165   RTX_CODE code;
 166   int i;
 167   int len;
 168   const char *fmt;
 169
 170   if (x == 0)
 171     {
 172       printf ("NULL_RTX");
 173       return;
 174     }
 175
 176   code = GET_CODE (x);
 177
 178   switch (code)
 179     {
 180     case MATCH_OPERAND:
 181     case MATCH_DUP:
 182       if (used)
 183         {
 184           if (used[XINT (x, 0)])
 185             {
 186               printf ("copy_rtx (operand%d)", XINT (x, 0));
 187               return;
 188             }
 189           used[XINT (x, 0)] = 1;
 190         }
 191       printf ("operand%d", XINT (x, 0));
 192       return;
 193
 194     case MATCH_OP_DUP:
 195       printf ("gen_rtx (GET_CODE (operand%d), ", XINT (x, 0));
 196       if (GET_MODE (x) == VOIDmode)
 197         printf ("GET_MODE (operand%d)", XINT (x, 0));
 198       else
 199         printf ("%smode", GET_MODE_NAME (GET_MODE (x)));
 200       for (i = 0; i < XVECLEN (x, 1); i++)
 201         {
 202           printf (",\n\t\t");
 203           gen_exp (XVECEXP (x, 1, i), subroutine_type, used);
 204         }
 205       printf (")");
 206       return;
 207
 208     case MATCH_OPERATOR:
 209       printf ("gen_rtx (GET_CODE (operand%d)", XINT (x, 0));
 210       printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
 211       for (i = 0; i < XVECLEN (x, 2); i++)
 212         {
 213           printf (",\n\t\t");
 214           gen_exp (XVECEXP (x, 2, i), subroutine_type, used);
 215         }
 216       printf (")");
 217       return;
 218
 219     case MATCH_PARALLEL:
 220     case MATCH_PAR_DUP:
 221       printf ("operand%d", XINT (x, 0));
 222       return;
 223
 224     case MATCH_SCRATCH:
 225       gen_rtx_scratch (x, subroutine_type);
 226       return;
 227
 228     case ADDRESS:
 229       fatal ("ADDRESS expression code used in named instruction pattern");
 230
 231     case PC:
 232       printf ("pc_rtx");
 233       return;
 234
 235     case CC0:
 236       printf ("cc0_rtx");
 237       return;
 238
 239     case CONST_INT:
 240       if (INTVAL (x) == 0)
 241         printf ("const0_rtx");
 242       else if (INTVAL (x) == 1)
 243         printf ("const1_rtx");
 244       else if (INTVAL (x) == -1)
 245         printf ("constm1_rtx");
 246       else if (INTVAL (x) == STORE_FLAG_VALUE)
 247         printf ("const_true_rtx");
 248       else
 249         {
 250           printf ("GEN_INT (");
 251           printf (HOST_WIDE_INT_PRINT_DEC_C, INTVAL (x));
 252           printf (")");
 253         }
 254       return;
 255
 256     case CONST_DOUBLE:
 257       /* These shouldn't be written in MD files.  Instead, the appropriate
 258          routines in varasm.c should be called.  */
 259       abort ();
 260
 261     default:
 262       break;
 263     }
 264
 265   printf ("gen_rtx_");
 266   print_code (code);
 267   printf (" (%smode", GET_MODE_NAME (GET_MODE (x)));
 268
 269   fmt = GET_RTX_FORMAT (code);
 270   len = GET_RTX_LENGTH (code);
 271   for (i = 0; i < len; i++)
 272     {
 273       if (fmt[i] == '0')
 274         break;
 275       printf (",\n\t");
 276       if (fmt[i] == 'e' || fmt[i] == 'u')
 277         gen_exp (XEXP (x, i), subroutine_type, used);
 278       else if (fmt[i] == 'i')
 279         printf ("%u", XINT (x, i));
 280       else if (fmt[i] == 's')
 281         printf ("\"%s\"", XSTR (x, i));
 282       else if (fmt[i] == 'E')
 283         {
 284           int j;
 285           printf ("gen_rtvec (%d", XVECLEN (x, i));
 286           for (j = 0; j < XVECLEN (x, i); j++)
 287             {
 288               printf (",\n\t\t");
 289               gen_exp (XVECEXP (x, i, j), subroutine_type, used);
 290             }
 291           printf (")");
 292         }
 293       else
 294         abort ();
 295     }
 296   printf (")");
 297 }
 298 \f
 299 /* Generate the `gen_...' function for a DEFINE_INSN.  */
 300
 301 static void
 302 gen_insn (insn, lineno)
 303      rtx insn;
 304      int lineno;
 305 {
 306   int operands;
 307   int i;
 308
 309   /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
 310      registers or MATCH_SCRATCHes.  If so, store away the information for
 311      later.  */
 312
 313   if (XVEC (insn, 1))
 314     {
 315       int has_hard_reg = 0;
 316
 317       for (i = XVECLEN (insn, 1) - 1; i > 0; i--)
 318         {
 319           if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER)
 320             break;
 321
 322           if (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) == REG)
 323             has_hard_reg = 1;
 324           else if (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH)
 325             break;
 326         }
 327
 328       if (i != XVECLEN (insn, 1) - 1)
 329         {
 330           struct clobber_pat *p;
 331           struct clobber_ent *link
 332             = (struct clobber_ent *) xmalloc (sizeof (struct clobber_ent));
 333           int j;
 334
 335           link->code_number = insn_code_number;
 336
 337           /* See if any previous CLOBBER_LIST entry is the same as this
 338              one.  */
 339
 340           for (p = clobber_list; p; p = p->next)
 341             {
 342               if (p->first_clobber != i + 1
 343                   || XVECLEN (p->pattern, 1) != XVECLEN (insn, 1))
 344                 continue;
 345
 346               for (j = i + 1; j < XVECLEN (insn, 1); j++)
 347                 {
 348                   rtx old = XEXP (XVECEXP (p->pattern, 1, j), 0);
 349                   rtx new = XEXP (XVECEXP (insn, 1, j), 0);
 350
 351                   /* OLD and NEW are the same if both are to be a SCRATCH
 352                      of the same mode,
 353                      or if both are registers of the same mode and number.  */
 354                   if (! (GET_MODE (old) == GET_MODE (new)
 355                          && ((GET_CODE (old) == MATCH_SCRATCH
 356                               && GET_CODE (new) == MATCH_SCRATCH)
 357                              || (GET_CODE (old) == REG && GET_CODE (new) == REG
 358                                  && REGNO (old) == REGNO (new)))))
 359                     break;
 360                 }
 361
 362               if (j == XVECLEN (insn, 1))
 363                 break;
 364             }
 365
 366           if (p == 0)
 367             {
 368               p = (struct clobber_pat *) xmalloc (sizeof (struct clobber_pat));
 369
 370               p->insns = 0;
 371               p->pattern = insn;
 372               p->first_clobber = i + 1;
 373               p->next = clobber_list;
 374               p->has_hard_reg = has_hard_reg;
 375               clobber_list = p;
 376             }
 377
 378           link->next = p->insns;
 379           p->insns = link;
 380         }
 381     }
 382
 383   /* Don't mention instructions whose names are the null string
 384      or begin with '*'.  They are in the machine description just
 385      to be recognized.  */
 386   if (XSTR (insn, 0)[0] == 0 || XSTR (insn, 0)[0] == '*')
 387     return;
 388
 389   printf ("/* %s:%d */\n", read_rtx_filename, lineno);
 390
 391   /* Find out how many operands this function has,
 392      and also whether any of them have register constraints.  */
 393   register_constraints = 0;
 394   operands = max_operand_vec (insn, 1);
 395   if (max_dup_opno >= operands)
 396     fatal ("match_dup operand number has no match_operand");
 397
 398   /* Output the function name and argument declarations.  */
 399   printf ("rtx\ngen_%s (", XSTR (insn, 0));
 400   for (i = 0; i < operands; i++)
 401     if (i)
 402       printf (", operand%d", i);
 403     else
 404       printf ("operand%d", i);
 405   printf (")\n");
 406   for (i = 0; i < operands; i++)
 407     printf ("     rtx operand%d ATTRIBUTE_UNUSED;\n", i);
 408   printf ("{\n");
 409
 410   /* Output code to construct and return the rtl for the instruction body */
 411
 412   if (XVECLEN (insn, 1) == 1)
 413     {
 414       printf ("  return ");
 415       gen_exp (XVECEXP (insn, 1, 0), DEFINE_INSN, NULL);
 416       printf (";\n}\n\n");
 417     }
 418   else
 419     {
 420       printf ("  return gen_rtx_PARALLEL (VOIDmode, gen_rtvec (%d",
 421               XVECLEN (insn, 1));
 422
 423       for (i = 0; i < XVECLEN (insn, 1); i++)
 424         {
 425           printf (",\n\t\t");
 426           gen_exp (XVECEXP (insn, 1, i), DEFINE_INSN, NULL);
 427         }
 428       printf ("));\n}\n\n");
 429     }
 430 }
 431 \f
 432 /* Generate the `gen_...' function for a DEFINE_EXPAND.  */
 433
 434 static void
 435 gen_expand (expand)
 436      rtx expand;
 437 {
 438   int operands;
 439   int i;
 440
 441   if (strlen (XSTR (expand, 0)) == 0)
 442     fatal ("define_expand lacks a name");
 443   if (XVEC (expand, 1) == 0)
 444     fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0));
 445
 446   /* Find out how many operands this function has,
 447      and also whether any of them have register constraints.  */
 448   register_constraints = 0;
 449
 450   operands = max_operand_vec (expand, 1);
 451
 452   /* Output the function name and argument declarations.  */
 453   printf ("rtx\ngen_%s (", XSTR (expand, 0));
 454   for (i = 0; i < operands; i++)
 455     if (i)
 456       printf (", operand%d", i);
 457     else
 458       printf ("operand%d", i);
 459   printf (")\n");
 460   for (i = 0; i < operands; i++)
 461     printf ("     rtx operand%d;\n", i);
 462   printf ("{\n");
 463
 464   /* If we don't have any C code to write, only one insn is being written,
 465      and no MATCH_DUPs are present, we can just return the desired insn
 466      like we do for a DEFINE_INSN.  This saves memory.  */
 467   if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0')
 468       && operands > max_dup_opno
 469       && XVECLEN (expand, 1) == 1)
 470     {
 471       printf ("  return ");
 472       gen_exp (XVECEXP (expand, 1, 0), DEFINE_EXPAND, NULL);
 473       printf (";\n}\n\n");
 474       return;
 475     }
 476
 477   /* For each operand referred to only with MATCH_DUPs,
 478      make a local variable.  */
 479   for (i = operands; i <= max_dup_opno; i++)
 480     printf ("  rtx operand%d;\n", i);
 481   for (; i <= max_scratch_opno; i++)
 482     printf ("  rtx operand%d ATTRIBUTE_UNUSED;\n", i);
 483   printf ("  rtx _val = 0;\n");
 484   printf ("  start_sequence ();\n");
 485
 486   /* The fourth operand of DEFINE_EXPAND is some code to be executed
 487      before the actual construction.
 488      This code expects to refer to `operands'
 489      just as the output-code in a DEFINE_INSN does,
 490      but here `operands' is an automatic array.
 491      So copy the operand values there before executing it.  */
 492   if (XSTR (expand, 3) && *XSTR (expand, 3))
 493     {
 494       printf ("  {\n");
 495       if (operands > 0 || max_dup_opno >= 0 || max_scratch_opno >= 0)
 496         printf ("    rtx operands[%d];\n",
 497             MAX (operands, MAX (max_scratch_opno, max_dup_opno) + 1));
 498       /* Output code to copy the arguments into `operands'.  */
 499       for (i = 0; i < operands; i++)
 500         printf ("    operands[%d] = operand%d;\n", i, i);
 501
 502       /* Output the special code to be executed before the sequence
 503          is generated.  */
 504       printf ("%s\n", XSTR (expand, 3));
 505
 506       /* Output code to copy the arguments back out of `operands'
 507          (unless we aren't going to use them at all).  */
 508       if (XVEC (expand, 1) != 0)
 509         {
 510           for (i = 0; i < operands; i++)
 511             printf ("    operand%d = operands[%d];\n", i, i);
 512           for (; i <= max_dup_opno; i++)
 513             printf ("    operand%d = operands[%d];\n", i, i);
 514           for (; i <= max_scratch_opno; i++)
 515             printf ("    operand%d = operands[%d];\n", i, i);
 516         }
 517       printf ("  }\n");
 518     }
 519
 520   /* Output code to construct the rtl for the instruction bodies.
 521      Use emit_insn to add them to the sequence being accumulated.
 522      But don't do this if the user's code has set `no_more' nonzero.  */
 523
 524   for (i = 0; i < XVECLEN (expand, 1); i++)
 525     {
 526       rtx next = XVECEXP (expand, 1, i);
 527       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 528           || (GET_CODE (next) == PARALLEL
 529               && ((GET_CODE (XVECEXP (next, 0, 0)) == SET
 530                    && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 531                   || GET_CODE (XVECEXP (next, 0, 0)) == RETURN))
 532           || GET_CODE (next) == RETURN)
 533         printf ("  emit_jump_insn (");
 534       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 535                || GET_CODE (next) == CALL
 536                || (GET_CODE (next) == PARALLEL
 537                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 538                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 539                || (GET_CODE (next) == PARALLEL
 540                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 541         printf ("  emit_call_insn (");
 542       else if (GET_CODE (next) == CODE_LABEL)
 543         printf ("  emit_label (");
 544       else if (GET_CODE (next) == MATCH_OPERAND
 545                || GET_CODE (next) == MATCH_DUP
 546                || GET_CODE (next) == MATCH_OPERATOR
 547                || GET_CODE (next) == MATCH_OP_DUP
 548                || GET_CODE (next) == MATCH_PARALLEL
 549                || GET_CODE (next) == MATCH_PAR_DUP
 550                || GET_CODE (next) == PARALLEL)
 551         printf ("  emit (");
 552       else
 553         printf ("  emit_insn (");
 554       gen_exp (next, DEFINE_EXPAND, NULL);
 555       printf (");\n");
 556       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 557           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 558         printf ("  emit_barrier ();");
 559     }
 560
 561   /* Call `get_insns' to extract the list of all the
 562      insns emitted within this gen_... function.  */
 563
 564   printf ("  _val = get_insns ();\n");
 565   printf ("  end_sequence ();\n");
 566   printf ("  return _val;\n}\n\n");
 567 }
 568
 569 /* Like gen_expand, but generates insns resulting from splitting SPLIT.  */
 570
 571 static void
 572 gen_split (split)
 573      rtx split;
 574 {
 575   int i;
 576   int operands;
 577   const char *const name =
 578     ((GET_CODE (split) == DEFINE_PEEPHOLE2) ? "peephole2" : "split");
 579   const char *unused;
 580   char *used;
 581
 582   if (XVEC (split, 0) == 0)
 583     fatal ("define_%s (definition %d) lacks a pattern", name,
 584            insn_index_number);
 585   else if (XVEC (split, 2) == 0)
 586     fatal ("define_%s (definition %d) lacks a replacement pattern", name,
 587            insn_index_number);
 588
 589   /* Find out how many operands this function has.  */
 590
 591   max_operand_vec (split, 2);
 592   operands = MAX (max_opno, MAX (max_dup_opno, max_scratch_opno)) + 1;
 593   unused = (operands == 0 ? " ATTRIBUTE_UNUSED" : "");
 594   used = xcalloc (1, operands);
 595
 596   /* Output the prototype, function name and argument declarations.  */
 597   if (GET_CODE (split) == DEFINE_PEEPHOLE2)
 598     {
 599       printf ("extern rtx gen_%s_%d PARAMS ((rtx, rtx *));\n",
 600               name, insn_code_number);
 601       printf ("rtx\ngen_%s_%d (curr_insn, operands)\n",
 602               name, insn_code_number);
 603       printf ("     rtx curr_insn ATTRIBUTE_UNUSED;\n");
 604       printf ("     rtx *operands%s;\n", unused);
 605     }
 606   else
 607     {
 608       printf ("extern rtx gen_split_%d PARAMS ((rtx *));\n", insn_code_number);
 609       printf ("rtx\ngen_%s_%d (operands)\n", name, insn_code_number);
 610       printf ("      rtx *operands%s;\n", unused);
 611     }
 612   printf ("{\n");
 613
 614   /* Declare all local variables.  */
 615   for (i = 0; i < operands; i++)
 616     printf ("  rtx operand%d;\n", i);
 617   printf ("  rtx _val = 0;\n");
 618
 619   if (GET_CODE (split) == DEFINE_PEEPHOLE2)
 620     output_peephole2_scratches (split);
 621
 622   printf ("  start_sequence ();\n");
 623
 624   /* The fourth operand of DEFINE_SPLIT is some code to be executed
 625      before the actual construction.  */
 626
 627   if (XSTR (split, 3))
 628     printf ("%s\n", XSTR (split, 3));
 629
 630   /* Output code to copy the arguments back out of `operands'  */
 631   for (i = 0; i < operands; i++)
 632     printf ("  operand%d = operands[%d];\n", i, i);
 633
 634   /* Output code to construct the rtl for the instruction bodies.
 635      Use emit_insn to add them to the sequence being accumulated.
 636      But don't do this if the user's code has set `no_more' nonzero.  */
 637
 638   for (i = 0; i < XVECLEN (split, 2); i++)
 639     {
 640       rtx next = XVECEXP (split, 2, i);
 641       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 642           || (GET_CODE (next) == PARALLEL
 643               && GET_CODE (XVECEXP (next, 0, 0)) == SET
 644               && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 645           || GET_CODE (next) == RETURN)
 646         printf ("  emit_jump_insn (");
 647       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 648                || GET_CODE (next) == CALL
 649                || (GET_CODE (next) == PARALLEL
 650                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 651                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 652                || (GET_CODE (next) == PARALLEL
 653                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 654         printf ("  emit_call_insn (");
 655       else if (GET_CODE (next) == CODE_LABEL)
 656         printf ("  emit_label (");
 657       else if (GET_CODE (next) == MATCH_OPERAND
 658                || GET_CODE (next) == MATCH_OPERATOR
 659                || GET_CODE (next) == MATCH_PARALLEL
 660                || GET_CODE (next) == MATCH_OP_DUP
 661                || GET_CODE (next) == MATCH_DUP
 662                || GET_CODE (next) == PARALLEL)
 663         printf ("  emit (");
 664       else
 665         printf ("  emit_insn (");
 666       gen_exp (next, GET_CODE (split), used);
 667       printf (");\n");
 668       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 669           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 670         printf ("  emit_barrier ();");
 671     }
 672
 673   /* Call `get_insns' to make a list of all the
 674      insns emitted within this gen_... function.  */
 675
 676   printf ("  _val = get_insns ();\n");
 677   printf ("  end_sequence ();\n");
 678   printf ("  return _val;\n}\n\n");
 679
 680   free (used);
 681 }
 682 \f
 683 /* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
 684    size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
 685    the end of the vector.  */
 686
 687 static void
 688 output_add_clobbers ()
 689 {
 690   struct clobber_pat *clobber;
 691   struct clobber_ent *ent;
 692   int i;
 693
 694   printf ("\n\nvoid\nadd_clobbers (pattern, insn_code_number)\n");
 695   printf ("     rtx pattern ATTRIBUTE_UNUSED;\n     int insn_code_number;\n");
 696   printf ("{\n");
 697   printf ("  switch (insn_code_number)\n");
 698   printf ("    {\n");
 699
 700   for (clobber = clobber_list; clobber; clobber = clobber->next)
 701     {
 702       for (ent = clobber->insns; ent; ent = ent->next)
 703         printf ("    case %d:\n", ent->code_number);
 704
 705       for (i = clobber->first_clobber; i < XVECLEN (clobber->pattern, 1); i++)
 706         {
 707           printf ("      XVECEXP (pattern, 0, %d) = ", i);
 708           gen_exp (XVECEXP (clobber->pattern, 1, i),
 709                    GET_CODE (clobber->pattern), NULL);
 710           printf (";\n");
 711         }
 712
 713       printf ("      break;\n\n");
 714     }
 715
 716   printf ("    default:\n");
 717   printf ("      abort ();\n");
 718   printf ("    }\n");
 719   printf ("}\n");
 720 }
 721 \f
 722 /* Write a function, `added_clobbers_hard_reg_p' this is given an insn_code
 723    number that needs clobbers and returns 1 if they include a clobber of a
 724    hard reg and 0 if they just clobber SCRATCH.  */
 725
 726 static void
 727 output_added_clobbers_hard_reg_p ()
 728 {
 729   struct clobber_pat *clobber;
 730   struct clobber_ent *ent;
 731   int clobber_p, used;
 732
 733   printf ("\n\nint\nadded_clobbers_hard_reg_p (insn_code_number)\n");
 734   printf ("     int insn_code_number;\n");
 735   printf ("{\n");
 736   printf ("  switch (insn_code_number)\n");
 737   printf ("    {\n");
 738
 739   for (clobber_p = 0; clobber_p <= 1; clobber_p++)
 740     {
 741       used = 0;
 742       for (clobber = clobber_list; clobber; clobber = clobber->next)
 743         if (clobber->has_hard_reg == clobber_p)
 744           for (ent = clobber->insns; ent; ent = ent->next)
 745             {
 746               printf ("    case %d:\n", ent->code_number);
 747               used++;
 748             }
 749
 750       if (used)
 751         printf ("      return %d;\n\n", clobber_p);
 752     }
 753
 754   printf ("    default:\n");
 755   printf ("      abort ();\n");
 756   printf ("    }\n");
 757   printf ("}\n");
 758 }
 759 \f
 760 /* Generate code to invoke find_free_register () as needed for the
 761    scratch registers used by the peephole2 pattern in SPLIT.  */
 762
 763 static void
 764 output_peephole2_scratches (split)
 765      rtx split;
 766 {
 767   int i;
 768   int insn_nr = 0;
 769
 770   printf ("  HARD_REG_SET _regs_allocated;\n");
 771   printf ("  CLEAR_HARD_REG_SET (_regs_allocated);\n");
 772
 773   for (i = 0; i < XVECLEN (split, 0); i++)
 774     {
 775       rtx elt = XVECEXP (split, 0, i);
 776       if (GET_CODE (elt) == MATCH_SCRATCH)
 777         {
 778           int last_insn_nr = insn_nr;
 779           int cur_insn_nr = insn_nr;
 780           int j;
 781           for (j = i + 1; j < XVECLEN (split, 0); j++)
 782             if (GET_CODE (XVECEXP (split, 0, j)) == MATCH_DUP)
 783               {
 784                 if (XINT (XVECEXP (split, 0, j), 0) == XINT (elt, 0))
 785                   last_insn_nr = cur_insn_nr;
 786               }
 787             else if (GET_CODE (XVECEXP (split, 0, j)) != MATCH_SCRATCH)
 788               cur_insn_nr++;
 789
 790           printf ("  if ((operands[%d] = peep2_find_free_register (%d, %d, \"%s\", %smode, &_regs_allocated)) == NULL_RTX)\n\
 791     return NULL;\n",
 792                   XINT (elt, 0),
 793                   insn_nr, last_insn_nr,
 794                   XSTR (elt, 1),
 795                   GET_MODE_NAME (GET_MODE (elt)));
 796
 797         }
 798       else if (GET_CODE (elt) != MATCH_DUP)
 799         insn_nr++;
 800     }
 801 }
 802
 803 extern int main PARAMS ((int, char **));
 804
 805 int
 806 main (argc, argv)
 807      int argc;
 808      char **argv;
 809 {
 810   rtx desc;
 811
 812   progname = "genemit";
 813
 814   if (argc <= 1)
 815     fatal ("no input file name");
 816
 817   if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE)
 818     return (FATAL_EXIT_CODE);
 819
 820   /* Assign sequential codes to all entries in the machine description
 821      in parallel with the tables in insn-output.c.  */
 822
 823   insn_code_number = 0;
 824   insn_index_number = 0;
 825
 826   printf ("/* Generated automatically by the program `genemit'\n\
 827 from the machine description file `md'.  */\n\n");
 828
 829   printf ("#include \"config.h\"\n");
 830   printf ("#include \"system.h\"\n");
 831   printf ("#include \"coretypes.h\"\n");
 832   printf ("#include \"tm.h\"\n");
 833   printf ("#include \"rtl.h\"\n");
 834   printf ("#include \"tm_p.h\"\n");
 835   printf ("#include \"function.h\"\n");
 836   printf ("#include \"expr.h\"\n");
 837   printf ("#include \"optabs.h\"\n");
 838   printf ("#include \"real.h\"\n");
 839   printf ("#include \"flags.h\"\n");
 840   printf ("#include \"output.h\"\n");
 841   printf ("#include \"insn-config.h\"\n");
 842   printf ("#include \"hard-reg-set.h\"\n");
 843   printf ("#include \"recog.h\"\n");
 844   printf ("#include \"resource.h\"\n");
 845   printf ("#include \"reload.h\"\n");
 846   printf ("#include \"toplev.h\"\n");
 847   printf ("#include \"ggc.h\"\n\n");
 848   printf ("#define FAIL return (end_sequence (), _val)\n");
 849   printf ("#define DONE return (_val = get_insns (), end_sequence (), _val)\n\n");
 850
 851   /* Read the machine description.  */
 852
 853   while (1)
 854     {
 855       int line_no;
 856
 857       desc = read_md_rtx (&line_no, &insn_code_number);
 858       if (desc == NULL)
 859         break;
 860
 861       switch (GET_CODE (desc))
 862         {
 863         case DEFINE_INSN:
 864           gen_insn (desc, line_no);
 865           break;
 866
 867         case DEFINE_EXPAND:
 868           printf ("/* %s:%d */\n", read_rtx_filename, line_no);
 869           gen_expand (desc);
 870           break;
 871
 872         case DEFINE_SPLIT:
 873           printf ("/* %s:%d */\n", read_rtx_filename, line_no);
 874           gen_split (desc);
 875           break;
 876
 877         case DEFINE_PEEPHOLE2:
 878           printf ("/* %s:%d */\n", read_rtx_filename, line_no);
 879           gen_split (desc);
 880           break;
 881
 882         default:
 883           break;
 884         }
 885       ++insn_index_number;
 886     }
 887
 888   /* Write out the routines to add CLOBBERs to a pattern and say whether they
 889      clobber a hard reg.  */
 890   output_add_clobbers ();
 891   output_added_clobbers_hard_reg_p ();
 892
 893   fflush (stdout);
 894   return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
 895 }
 896
 897 /* Define this so we can link with print-rtl.o to get debug_rtx function.  */
 898 const char *
 899 get_insn_name (code)
 900      int code ATTRIBUTE_UNUSED;
 901 {
 902   return NULL;
 903 }