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