gcc/genemit.c

   1 /* Generate code from machine description to emit insns as rtl.
   2    Copyright (C) 1987-2015 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20
  21 #include "bconfig.h"
  22 #include "system.h"
  23 #include "coretypes.h"
  24 #include "tm.h"
  25 #include "rtl.h"
  26 #include "errors.h"
  27 #include "read-md.h"
  28 #include "gensupport.h"
  29
  30
  31 static int insn_code_number;
  32 static int insn_index_number;
  33
  34 /* Data structure for recording the patterns of insns that have CLOBBERs.
  35    We use this to output a function that adds these CLOBBERs to a
  36    previously-allocated PARALLEL expression.  */
  37
  38 struct clobber_pat
  39 {
  40   struct clobber_ent *insns;
  41   rtx pattern;
  42   int first_clobber;
  43   struct clobber_pat *next;
  44   int has_hard_reg;
  45 } *clobber_list;
  46
  47 /* Records one insn that uses the clobber list.  */
  48
  49 struct clobber_ent
  50 {
  51   int code_number;              /* Counts only insns.  */
  52   struct clobber_ent *next;
  53 };
  54
  55 static void print_code                  (RTX_CODE);
  56 static void gen_exp                     (rtx, enum rtx_code, char *);
  57 static void gen_insn                    (rtx, int);
  58 static void gen_expand                  (rtx);
  59 static void gen_split                   (rtx);
  60 static void output_add_clobbers         (void);
  61 static void output_added_clobbers_hard_reg_p (void);
  62 static void gen_rtx_scratch             (rtx, enum rtx_code);
  63 static void output_peephole2_scratches  (rtx);
  64
  65 \f
  66 static void
  67 print_code (RTX_CODE code)
  68 {
  69   const char *p1;
  70   for (p1 = GET_RTX_NAME (code); *p1; p1++)
  71     putchar (TOUPPER (*p1));
  72 }
  73
  74 static void
  75 gen_rtx_scratch (rtx x, enum rtx_code subroutine_type)
  76 {
  77   if (subroutine_type == DEFINE_PEEPHOLE2)
  78     {
  79       printf ("operand%d", XINT (x, 0));
  80     }
  81   else
  82     {
  83       printf ("gen_rtx_SCRATCH (%smode)", GET_MODE_NAME (GET_MODE (x)));
  84     }
  85 }
  86
  87 /* Print a C expression to construct an RTX just like X,
  88    substituting any operand references appearing within.  */
  89
  90 static void
  91 gen_exp (rtx x, enum rtx_code subroutine_type, char *used)
  92 {
  93   RTX_CODE code;
  94   int i;
  95   int len;
  96   const char *fmt;
  97   const char *sep = "";
  98
  99   if (x == 0)
 100     {
 101       printf ("NULL_RTX");
 102       return;
 103     }
 104
 105   code = GET_CODE (x);
 106
 107   switch (code)
 108     {
 109     case MATCH_OPERAND:
 110     case MATCH_DUP:
 111       if (used)
 112         {
 113           if (used[XINT (x, 0)])
 114             {
 115               printf ("copy_rtx (operand%d)", XINT (x, 0));
 116               return;
 117             }
 118           used[XINT (x, 0)] = 1;
 119         }
 120       printf ("operand%d", XINT (x, 0));
 121       return;
 122
 123     case MATCH_OP_DUP:
 124       printf ("gen_rtx_fmt_");
 125       for (i = 0; i < XVECLEN (x, 1); i++)
 126         printf ("e");
 127       printf (" (GET_CODE (operand%d), ", XINT (x, 0));
 128       if (GET_MODE (x) == VOIDmode)
 129         printf ("GET_MODE (operand%d)", XINT (x, 0));
 130       else
 131         printf ("%smode", GET_MODE_NAME (GET_MODE (x)));
 132       for (i = 0; i < XVECLEN (x, 1); i++)
 133         {
 134           printf (",\n\t\t");
 135           gen_exp (XVECEXP (x, 1, i), subroutine_type, used);
 136         }
 137       printf (")");
 138       return;
 139
 140     case MATCH_OPERATOR:
 141       printf ("gen_rtx_fmt_");
 142       for (i = 0; i < XVECLEN (x, 2); i++)
 143         printf ("e");
 144       printf (" (GET_CODE (operand%d)", XINT (x, 0));
 145       printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
 146       for (i = 0; i < XVECLEN (x, 2); i++)
 147         {
 148           printf (",\n\t\t");
 149           gen_exp (XVECEXP (x, 2, i), subroutine_type, used);
 150         }
 151       printf (")");
 152       return;
 153
 154     case MATCH_PARALLEL:
 155     case MATCH_PAR_DUP:
 156       printf ("operand%d", XINT (x, 0));
 157       return;
 158
 159     case MATCH_SCRATCH:
 160       gen_rtx_scratch (x, subroutine_type);
 161       return;
 162
 163     case PC:
 164       printf ("pc_rtx");
 165       return;
 166     case RETURN:
 167       printf ("ret_rtx");
 168       return;
 169     case SIMPLE_RETURN:
 170       printf ("simple_return_rtx");
 171       return;
 172     case CLOBBER:
 173       if (REG_P (XEXP (x, 0)))
 174         {
 175           printf ("gen_hard_reg_clobber (%smode, %i)", GET_MODE_NAME (GET_MODE (XEXP (x, 0))),
 176                                                      REGNO (XEXP (x, 0)));
 177           return;
 178         }
 179       break;
 180
 181     case CC0:
 182       printf ("cc0_rtx");
 183       return;
 184
 185     case CONST_INT:
 186       if (INTVAL (x) == 0)
 187         printf ("const0_rtx");
 188       else if (INTVAL (x) == 1)
 189         printf ("const1_rtx");
 190       else if (INTVAL (x) == -1)
 191         printf ("constm1_rtx");
 192       else if (-MAX_SAVED_CONST_INT <= INTVAL (x)
 193           && INTVAL (x) <= MAX_SAVED_CONST_INT)
 194         printf ("const_int_rtx[MAX_SAVED_CONST_INT + (%d)]",
 195                 (int) INTVAL (x));
 196       else if (INTVAL (x) == STORE_FLAG_VALUE)
 197         printf ("const_true_rtx");
 198       else
 199         {
 200           printf ("GEN_INT (");
 201           printf (HOST_WIDE_INT_PRINT_DEC_C, INTVAL (x));
 202           printf (")");
 203         }
 204       return;
 205
 206     case CONST_DOUBLE:
 207     case CONST_FIXED:
 208     case CONST_WIDE_INT:
 209       /* These shouldn't be written in MD files.  Instead, the appropriate
 210          routines in varasm.c should be called.  */
 211       gcc_unreachable ();
 212
 213     default:
 214       break;
 215     }
 216
 217   printf ("gen_rtx_");
 218   print_code (code);
 219   printf (" (");
 220   if (!always_void_p (code))
 221     {
 222       printf ("%smode", GET_MODE_NAME (GET_MODE (x)));
 223       sep = ",\n\t";
 224     }
 225
 226   fmt = GET_RTX_FORMAT (code);
 227   len = GET_RTX_LENGTH (code);
 228   for (i = 0; i < len; i++)
 229     {
 230       if (fmt[i] == '0')
 231         break;
 232       fputs (sep, stdout);
 233       switch (fmt[i])
 234         {
 235         case 'e': case 'u':
 236           gen_exp (XEXP (x, i), subroutine_type, used);
 237           break;
 238
 239         case 'i':
 240           printf ("%u", XINT (x, i));
 241           break;
 242
 243         case 'r':
 244           printf ("%u", REGNO (x));
 245           break;
 246
 247         case 's':
 248           printf ("\"%s\"", XSTR (x, i));
 249           break;
 250
 251         case 'E':
 252           {
 253             int j;
 254             printf ("gen_rtvec (%d", XVECLEN (x, i));
 255             for (j = 0; j < XVECLEN (x, i); j++)
 256               {
 257                 printf (",\n\t\t");
 258                 gen_exp (XVECEXP (x, i, j), subroutine_type, used);
 259               }
 260             printf (")");
 261             break;
 262           }
 263
 264         default:
 265           gcc_unreachable ();
 266         }
 267       sep = ",\n\t";
 268     }
 269   printf (")");
 270 }
 271
 272 /* Output code to emit the instruction patterns in VEC, with each element
 273    becoming a separate instruction.  USED is as for gen_exp.  */
 274
 275 static void
 276 gen_emit_seq (rtvec vec, char *used)
 277 {
 278   for (int i = 0, len = GET_NUM_ELEM (vec); i < len; ++i)
 279     {
 280       rtx next = RTVEC_ELT (vec, i);
 281       printf ("  %s (", get_emit_function (next));
 282       gen_exp (next, DEFINE_EXPAND, used);
 283       printf (");\n");
 284       if (needs_barrier_p (next))
 285         printf ("  emit_barrier ();");
 286     }
 287 }
 288 \f
 289 /* Generate the `gen_...' function for a DEFINE_INSN.  */
 290
 291 static void
 292 gen_insn (rtx insn, int lineno)
 293 {
 294   struct pattern_stats stats;
 295   int i;
 296
 297   /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
 298      registers or MATCH_SCRATCHes.  If so, store away the information for
 299      later.  */
 300
 301   if (XVEC (insn, 1))
 302     {
 303       int has_hard_reg = 0;
 304
 305       for (i = XVECLEN (insn, 1) - 1; i > 0; i--)
 306         {
 307           if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER)
 308             break;
 309
 310           if (REG_P (XEXP (XVECEXP (insn, 1, i), 0)))
 311             has_hard_reg = 1;
 312           else if (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH)
 313             break;
 314         }
 315
 316       if (i != XVECLEN (insn, 1) - 1)
 317         {
 318           struct clobber_pat *p;
 319           struct clobber_ent *link = XNEW (struct clobber_ent);
 320           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_rtx = XEXP (XVECEXP (p->pattern, 1, j), 0);
 336                   rtx new_rtx = XEXP (XVECEXP (insn, 1, j), 0);
 337
 338                   /* OLD and NEW_INSN 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_rtx) == GET_MODE (new_rtx)
 342                          && ((GET_CODE (old_rtx) == MATCH_SCRATCH
 343                               && GET_CODE (new_rtx) == MATCH_SCRATCH)
 344                              || (REG_P (old_rtx) && REG_P (new_rtx)
 345                                  && REGNO (old_rtx) == REGNO (new_rtx)))))
 346                     break;
 347                 }
 348
 349               if (j == XVECLEN (insn, 1))
 350                 break;
 351             }
 352
 353           if (p == 0)
 354             {
 355               p = XNEW (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   printf ("/* %s:%d */\n", read_md_filename, lineno);
 377
 378   /* Find out how many operands this function has.  */
 379   get_pattern_stats (&stats, XVEC (insn, 1));
 380   if (stats.max_dup_opno > stats.max_opno)
 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   if (stats.num_generator_args)
 386     for (i = 0; i < stats.num_generator_args; i++)
 387       if (i)
 388         printf (",\n\trtx operand%d ATTRIBUTE_UNUSED", i);
 389       else
 390         printf ("rtx operand%d ATTRIBUTE_UNUSED", i);
 391   else
 392     printf ("void");
 393   printf (")\n");
 394   printf ("{\n");
 395
 396   /* Output code to construct and return the rtl for the instruction body.  */
 397
 398   rtx pattern = add_implicit_parallel (XVEC (insn, 1));
 399   /* ??? This is the traditional behavior, but seems suspect.  */
 400   char *used = (XVECLEN (insn, 1) == 1
 401                 ? NULL
 402                 : XCNEWVEC (char, stats.num_generator_args));
 403   printf ("  return ");
 404   gen_exp (pattern, DEFINE_INSN, used);
 405   printf (";\n}\n\n");
 406   XDELETEVEC (used);
 407 }
 408 \f
 409 /* Generate the `gen_...' function for a DEFINE_EXPAND.  */
 410
 411 static void
 412 gen_expand (rtx expand)
 413 {
 414   struct pattern_stats stats;
 415   int i;
 416   char *used;
 417
 418   if (strlen (XSTR (expand, 0)) == 0)
 419     fatal ("define_expand lacks a name");
 420   if (XVEC (expand, 1) == 0)
 421     fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0));
 422
 423   /* Find out how many operands this function has.  */
 424   get_pattern_stats (&stats, XVEC (expand, 1));
 425
 426   /* Output the function name and argument declarations.  */
 427   printf ("rtx\ngen_%s (", XSTR (expand, 0));
 428   if (stats.num_generator_args)
 429     for (i = 0; i < stats.num_generator_args; i++)
 430       if (i)
 431         printf (",\n\trtx operand%d", i);
 432       else
 433         printf ("rtx operand%d", i);
 434   else
 435     printf ("void");
 436   printf (")\n");
 437   printf ("{\n");
 438
 439   /* If we don't have any C code to write, only one insn is being written,
 440      and no MATCH_DUPs are present, we can just return the desired insn
 441      like we do for a DEFINE_INSN.  This saves memory.  */
 442   if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0')
 443       && stats.max_opno >= stats.max_dup_opno
 444       && XVECLEN (expand, 1) == 1)
 445     {
 446       printf ("  return ");
 447       gen_exp (XVECEXP (expand, 1, 0), DEFINE_EXPAND, NULL);
 448       printf (";\n}\n\n");
 449       return;
 450     }
 451
 452   /* For each operand referred to only with MATCH_DUPs,
 453      make a local variable.  */
 454   for (i = stats.num_generator_args; i <= stats.max_dup_opno; i++)
 455     printf ("  rtx operand%d;\n", i);
 456   for (; i <= stats.max_scratch_opno; i++)
 457     printf ("  rtx operand%d ATTRIBUTE_UNUSED;\n", i);
 458   printf ("  rtx_insn *_val = 0;\n");
 459   printf ("  start_sequence ();\n");
 460
 461   /* The fourth operand of DEFINE_EXPAND is some code to be executed
 462      before the actual construction.
 463      This code expects to refer to `operands'
 464      just as the output-code in a DEFINE_INSN does,
 465      but here `operands' is an automatic array.
 466      So copy the operand values there before executing it.  */
 467   if (XSTR (expand, 3) && *XSTR (expand, 3))
 468     {
 469       printf ("  {\n");
 470       if (stats.num_operand_vars > 0)
 471         printf ("    rtx operands[%d];\n", stats.num_operand_vars);
 472
 473       /* Output code to copy the arguments into `operands'.  */
 474       for (i = 0; i < stats.num_generator_args; i++)
 475         printf ("    operands[%d] = operand%d;\n", i, i);
 476
 477       /* Output the special code to be executed before the sequence
 478          is generated.  */
 479       print_md_ptr_loc (XSTR (expand, 3));
 480       printf ("%s\n", XSTR (expand, 3));
 481
 482       /* Output code to copy the arguments back out of `operands'
 483          (unless we aren't going to use them at all).  */
 484       if (XVEC (expand, 1) != 0)
 485         {
 486           for (i = 0; i < stats.num_operand_vars; i++)
 487             {
 488               printf ("    operand%d = operands[%d];\n", i, i);
 489               printf ("    (void) operand%d;\n", i);
 490             }
 491         }
 492       printf ("  }\n");
 493     }
 494
 495   used = XCNEWVEC (char, stats.num_operand_vars);
 496   gen_emit_seq (XVEC (expand, 1), used);
 497   XDELETEVEC (used);
 498
 499   /* Call `get_insns' to extract the list of all the
 500      insns emitted within this gen_... function.  */
 501
 502   printf ("  _val = get_insns ();\n");
 503   printf ("  end_sequence ();\n");
 504   printf ("  return _val;\n}\n\n");
 505 }
 506
 507 /* Like gen_expand, but generates insns resulting from splitting SPLIT.  */
 508
 509 static void
 510 gen_split (rtx split)
 511 {
 512   struct pattern_stats stats;
 513   int i;
 514   const char *const name =
 515     ((GET_CODE (split) == DEFINE_PEEPHOLE2) ? "peephole2" : "split");
 516   const char *unused;
 517   char *used;
 518
 519   if (XVEC (split, 0) == 0)
 520     fatal ("define_%s (definition %d) lacks a pattern", name,
 521            insn_index_number);
 522   else if (XVEC (split, 2) == 0)
 523     fatal ("define_%s (definition %d) lacks a replacement pattern", name,
 524            insn_index_number);
 525
 526   /* Find out how many operands this function has.  */
 527
 528   get_pattern_stats (&stats, XVEC (split, 2));
 529   unused = (stats.num_operand_vars == 0 ? " ATTRIBUTE_UNUSED" : "");
 530   used = XCNEWVEC (char, stats.num_operand_vars);
 531
 532   /* Output the prototype, function name and argument declarations.  */
 533   if (GET_CODE (split) == DEFINE_PEEPHOLE2)
 534     {
 535       printf ("extern rtx_insn *gen_%s_%d (rtx_insn *, rtx *);\n",
 536               name, insn_code_number);
 537       printf ("rtx_insn *\ngen_%s_%d (rtx_insn *curr_insn ATTRIBUTE_UNUSED, rtx *operands%s)\n",
 538               name, insn_code_number, unused);
 539     }
 540   else
 541     {
 542       printf ("extern rtx_insn *gen_split_%d (rtx_insn *, rtx *);\n",
 543               insn_code_number);
 544       printf ("rtx_insn *\ngen_split_%d "
 545               "(rtx_insn *curr_insn ATTRIBUTE_UNUSED, rtx *operands%s)\n",
 546               insn_code_number, unused);
 547     }
 548   printf ("{\n");
 549
 550   /* Declare all local variables.  */
 551   for (i = 0; i < stats.num_operand_vars; i++)
 552     printf ("  rtx operand%d;\n", i);
 553   printf ("  rtx_insn *_val = NULL;\n");
 554
 555   if (GET_CODE (split) == DEFINE_PEEPHOLE2)
 556     output_peephole2_scratches (split);
 557
 558   printf ("  if (dump_file)\n");
 559   printf ("    fprintf (dump_file, \"Splitting with gen_%s_%d\\n\");\n",
 560           name, insn_code_number);
 561
 562   printf ("  start_sequence ();\n");
 563
 564   /* The fourth operand of DEFINE_SPLIT is some code to be executed
 565      before the actual construction.  */
 566
 567   if (XSTR (split, 3))
 568     {
 569       print_md_ptr_loc (XSTR (split, 3));
 570       printf ("%s\n", XSTR (split, 3));
 571     }
 572
 573   /* Output code to copy the arguments back out of `operands'  */
 574   for (i = 0; i < stats.num_operand_vars; i++)
 575     {
 576       printf ("  operand%d = operands[%d];\n", i, i);
 577       printf ("  (void) operand%d;\n", i);
 578     }
 579
 580   gen_emit_seq (XVEC (split, 2), used);
 581
 582   /* Call `get_insns' to make a list of all the
 583      insns emitted within this gen_... function.  */
 584
 585   printf ("  _val = get_insns ();\n");
 586   printf ("  end_sequence ();\n");
 587   printf ("  return _val;\n}\n\n");
 588
 589   free (used);
 590 }
 591 \f
 592 /* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
 593    size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
 594    the end of the vector.  */
 595
 596 static void
 597 output_add_clobbers (void)
 598 {
 599   struct clobber_pat *clobber;
 600   struct clobber_ent *ent;
 601   int i;
 602
 603   printf ("\n\nvoid\nadd_clobbers (rtx pattern ATTRIBUTE_UNUSED, int insn_code_number)\n");
 604   printf ("{\n");
 605   printf ("  switch (insn_code_number)\n");
 606   printf ("    {\n");
 607
 608   for (clobber = clobber_list; clobber; clobber = clobber->next)
 609     {
 610       for (ent = clobber->insns; ent; ent = ent->next)
 611         printf ("    case %d:\n", ent->code_number);
 612
 613       for (i = clobber->first_clobber; i < XVECLEN (clobber->pattern, 1); i++)
 614         {
 615           printf ("      XVECEXP (pattern, 0, %d) = ", i);
 616           gen_exp (XVECEXP (clobber->pattern, 1, i),
 617                    GET_CODE (clobber->pattern), NULL);
 618           printf (";\n");
 619         }
 620
 621       printf ("      break;\n\n");
 622     }
 623
 624   printf ("    default:\n");
 625   printf ("      gcc_unreachable ();\n");
 626   printf ("    }\n");
 627   printf ("}\n");
 628 }
 629 \f
 630 /* Write a function, `added_clobbers_hard_reg_p' that is given an insn_code
 631    number that will have clobbers added (as indicated by `recog') and returns
 632    1 if those include a clobber of a hard reg or 0 if all of them just clobber
 633    SCRATCH.  */
 634
 635 static void
 636 output_added_clobbers_hard_reg_p (void)
 637 {
 638   struct clobber_pat *clobber;
 639   struct clobber_ent *ent;
 640   int clobber_p, used;
 641
 642   printf ("\n\nint\nadded_clobbers_hard_reg_p (int insn_code_number)\n");
 643   printf ("{\n");
 644   printf ("  switch (insn_code_number)\n");
 645   printf ("    {\n");
 646
 647   for (clobber_p = 0; clobber_p <= 1; clobber_p++)
 648     {
 649       used = 0;
 650       for (clobber = clobber_list; clobber; clobber = clobber->next)
 651         if (clobber->has_hard_reg == clobber_p)
 652           for (ent = clobber->insns; ent; ent = ent->next)
 653             {
 654               printf ("    case %d:\n", ent->code_number);
 655               used++;
 656             }
 657
 658       if (used)
 659         printf ("      return %d;\n\n", clobber_p);
 660     }
 661
 662   printf ("    default:\n");
 663   printf ("      gcc_unreachable ();\n");
 664   printf ("    }\n");
 665   printf ("}\n");
 666 }
 667 \f
 668 /* Generate code to invoke find_free_register () as needed for the
 669    scratch registers used by the peephole2 pattern in SPLIT.  */
 670
 671 static void
 672 output_peephole2_scratches (rtx split)
 673 {
 674   int i;
 675   int insn_nr = 0;
 676   bool first = true;
 677
 678   for (i = 0; i < XVECLEN (split, 0); i++)
 679     {
 680       rtx elt = XVECEXP (split, 0, i);
 681       if (GET_CODE (elt) == MATCH_SCRATCH)
 682         {
 683           int last_insn_nr = insn_nr;
 684           int cur_insn_nr = insn_nr;
 685           int j;
 686           for (j = i + 1; j < XVECLEN (split, 0); j++)
 687             if (GET_CODE (XVECEXP (split, 0, j)) == MATCH_DUP)
 688               {
 689                 if (XINT (XVECEXP (split, 0, j), 0) == XINT (elt, 0))
 690                   last_insn_nr = cur_insn_nr;
 691               }
 692             else if (GET_CODE (XVECEXP (split, 0, j)) != MATCH_SCRATCH)
 693               cur_insn_nr++;
 694
 695           if (first)
 696             {
 697               printf ("  HARD_REG_SET _regs_allocated;\n");
 698               printf ("  CLEAR_HARD_REG_SET (_regs_allocated);\n");
 699               first = false;
 700             }
 701
 702           printf ("  if ((operands[%d] = peep2_find_free_register (%d, %d, \"%s\", %smode, &_regs_allocated)) == NULL_RTX)\n\
 703     return NULL;\n",
 704                   XINT (elt, 0),
 705                   insn_nr, last_insn_nr,
 706                   XSTR (elt, 1),
 707                   GET_MODE_NAME (GET_MODE (elt)));
 708
 709         }
 710       else if (GET_CODE (elt) != MATCH_DUP)
 711         insn_nr++;
 712     }
 713 }
 714
 715 int
 716 main (int argc, char **argv)
 717 {
 718   rtx desc;
 719
 720   progname = "genemit";
 721
 722   if (!init_rtx_reader_args (argc, argv))
 723     return (FATAL_EXIT_CODE);
 724
 725   /* Assign sequential codes to all entries in the machine description
 726      in parallel with the tables in insn-output.c.  */
 727
 728   insn_code_number = 0;
 729   insn_index_number = 0;
 730
 731   printf ("/* Generated automatically by the program `genemit'\n\
 732 from the machine description file `md'.  */\n\n");
 733
 734   printf ("#include \"config.h\"\n");
 735   printf ("#include \"system.h\"\n");
 736   printf ("#include \"coretypes.h\"\n");
 737   printf ("#include \"tm.h\"\n");
 738   printf ("#include \"input.h\"\n");
 739   printf ("#include \"alias.h\"\n");
 740   printf ("#include \"symtab.h\"\n");
 741   printf ("#include \"tree.h\"\n");
 742   printf ("#include \"varasm.h\"\n");
 743   printf ("#include \"stor-layout.h\"\n");
 744   printf ("#include \"calls.h\"\n");
 745   printf ("#include \"rtl.h\"\n");
 746   printf ("#include \"tm_p.h\"\n");
 747   printf ("#include \"hard-reg-set.h\"\n");
 748   printf ("#include \"function.h\"\n");
 749   printf ("#include \"flags.h\"\n");
 750   printf ("#include \"insn-config.h\"\n");
 751   printf ("#include \"expmed.h\"\n");
 752   printf ("#include \"dojump.h\"\n");
 753   printf ("#include \"explow.h\"\n");
 754   printf ("#include \"emit-rtl.h\"\n");
 755   printf ("#include \"stmt.h\"\n");
 756   printf ("#include \"expr.h\"\n");
 757   printf ("#include \"insn-codes.h\"\n");
 758   printf ("#include \"optabs.h\"\n");
 759   printf ("#include \"dfp.h\"\n");
 760   printf ("#include \"output.h\"\n");
 761   printf ("#include \"recog.h\"\n");
 762   printf ("#include \"predict.h\"\n");
 763   printf ("#include \"basic-block.h\"\n");
 764   printf ("#include \"resource.h\"\n");
 765   printf ("#include \"reload.h\"\n");
 766   printf ("#include \"diagnostic-core.h\"\n");
 767   printf ("#include \"regs.h\"\n");
 768   printf ("#include \"tm-constrs.h\"\n");
 769   printf ("#include \"ggc.h\"\n");
 770   printf ("#include \"basic-block.h\"\n");
 771   printf ("#include \"dumpfile.h\"\n");
 772   printf ("#include \"target.h\"\n\n");
 773   printf ("#define FAIL return (end_sequence (), _val)\n");
 774   printf ("#define DONE return (_val = get_insns (), end_sequence (), _val)\n\n");
 775
 776   /* Read the machine description.  */
 777
 778   while (1)
 779     {
 780       int line_no;
 781
 782       desc = read_md_rtx (&line_no, &insn_code_number);
 783       if (desc == NULL)
 784         break;
 785
 786       switch (GET_CODE (desc))
 787         {
 788         case DEFINE_INSN:
 789           gen_insn (desc, line_no);
 790           break;
 791
 792         case DEFINE_EXPAND:
 793           printf ("/* %s:%d */\n", read_md_filename, line_no);
 794           gen_expand (desc);
 795           break;
 796
 797         case DEFINE_SPLIT:
 798           printf ("/* %s:%d */\n", read_md_filename, line_no);
 799           gen_split (desc);
 800           break;
 801
 802         case DEFINE_PEEPHOLE2:
 803           printf ("/* %s:%d */\n", read_md_filename, line_no);
 804           gen_split (desc);
 805           break;
 806
 807         default:
 808           break;
 809         }
 810       ++insn_index_number;
 811     }
 812
 813   /* Write out the routines to add CLOBBERs to a pattern and say whether they
 814      clobber a hard reg.  */
 815   output_add_clobbers ();
 816   output_added_clobbers_hard_reg_p ();
 817
 818   fflush (stdout);
 819   return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
 820 }