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    2003, 2004, 2005 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, 51 Franklin Street, Fifth Floor, Boston, MA
  20 02110-1301, 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 insn_code_number;
  36 static int insn_index_number;
  37
  38 /* Data structure for recording the patterns of insns that have CLOBBERs.
  39    We use this to output a function that adds these CLOBBERs to a
  40    previously-allocated PARALLEL expression.  */
  41
  42 struct clobber_pat
  43 {
  44   struct clobber_ent *insns;
  45   rtx pattern;
  46   int first_clobber;
  47   struct clobber_pat *next;
  48   int has_hard_reg;
  49 } *clobber_list;
  50
  51 /* Records one insn that uses the clobber list.  */
  52
  53 struct clobber_ent
  54 {
  55   int code_number;              /* Counts only insns.  */
  56   struct clobber_ent *next;
  57 };
  58
  59 static void max_operand_1               (rtx);
  60 static int max_operand_vec              (rtx, int);
  61 static void print_code                  (RTX_CODE);
  62 static void gen_exp                     (rtx, enum rtx_code, char *);
  63 static void gen_insn                    (rtx, int);
  64 static void gen_expand                  (rtx);
  65 static void gen_split                   (rtx);
  66 static void output_add_clobbers         (void);
  67 static void output_added_clobbers_hard_reg_p (void);
  68 static void gen_rtx_scratch             (rtx, enum rtx_code);
  69 static void output_peephole2_scratches  (rtx);
  70
  71 \f
  72 static void
  73 max_operand_1 (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 || code == MATCH_OPERATOR
  86       || code == MATCH_PARALLEL)
  87     max_opno = MAX (max_opno, XINT (x, 0));
  88   if (code == MATCH_DUP || code == MATCH_OP_DUP || code == MATCH_PAR_DUP)
  89     max_dup_opno = MAX (max_dup_opno, XINT (x, 0));
  90   if (code == MATCH_SCRATCH)
  91     max_scratch_opno = MAX (max_scratch_opno, XINT (x, 0));
  92
  93   fmt = GET_RTX_FORMAT (code);
  94   len = GET_RTX_LENGTH (code);
  95   for (i = 0; i < len; i++)
  96     {
  97       if (fmt[i] == 'e' || fmt[i] == 'u')
  98         max_operand_1 (XEXP (x, i));
  99       else if (fmt[i] == 'E')
 100         {
 101           int j;
 102           for (j = 0; j < XVECLEN (x, i); j++)
 103             max_operand_1 (XVECEXP (x, i, j));
 104         }
 105     }
 106 }
 107
 108 static int
 109 max_operand_vec (rtx insn, int arg)
 110 {
 111   int len = XVECLEN (insn, arg);
 112   int i;
 113
 114   max_opno = -1;
 115   max_dup_opno = -1;
 116   max_scratch_opno = -1;
 117
 118   for (i = 0; i < len; i++)
 119     max_operand_1 (XVECEXP (insn, arg, i));
 120
 121   return max_opno + 1;
 122 }
 123 \f
 124 static void
 125 print_code (RTX_CODE code)
 126 {
 127   const char *p1;
 128   for (p1 = GET_RTX_NAME (code); *p1; p1++)
 129     putchar (TOUPPER(*p1));
 130 }
 131
 132 static void
 133 gen_rtx_scratch (rtx x, enum rtx_code subroutine_type)
 134 {
 135   if (subroutine_type == DEFINE_PEEPHOLE2)
 136     {
 137       printf ("operand%d", XINT (x, 0));
 138     }
 139   else
 140     {
 141       printf ("gen_rtx_SCRATCH (%smode)", GET_MODE_NAME (GET_MODE (x)));
 142     }
 143 }
 144
 145 /* Print a C expression to construct an RTX just like X,
 146    substituting any operand references appearing within.  */
 147
 148 static void
 149 gen_exp (rtx x, enum rtx_code subroutine_type, char *used)
 150 {
 151   RTX_CODE code;
 152   int i;
 153   int len;
 154   const char *fmt;
 155
 156   if (x == 0)
 157     {
 158       printf ("NULL_RTX");
 159       return;
 160     }
 161
 162   code = GET_CODE (x);
 163
 164   switch (code)
 165     {
 166     case MATCH_OPERAND:
 167     case MATCH_DUP:
 168       if (used)
 169         {
 170           if (used[XINT (x, 0)])
 171             {
 172               printf ("copy_rtx (operand%d)", XINT (x, 0));
 173               return;
 174             }
 175           used[XINT (x, 0)] = 1;
 176         }
 177       printf ("operand%d", XINT (x, 0));
 178       return;
 179
 180     case MATCH_OP_DUP:
 181       printf ("gen_rtx_fmt_");
 182       for (i = 0; i < XVECLEN (x, 1); i++)
 183         printf ("e");
 184       printf (" (GET_CODE (operand%d), ", XINT (x, 0));
 185       if (GET_MODE (x) == VOIDmode)
 186         printf ("GET_MODE (operand%d)", XINT (x, 0));
 187       else
 188         printf ("%smode", GET_MODE_NAME (GET_MODE (x)));
 189       for (i = 0; i < XVECLEN (x, 1); i++)
 190         {
 191           printf (",\n\t\t");
 192           gen_exp (XVECEXP (x, 1, i), subroutine_type, used);
 193         }
 194       printf (")");
 195       return;
 196
 197     case MATCH_OPERATOR:
 198       printf ("gen_rtx_fmt_");
 199       for (i = 0; i < XVECLEN (x, 2); i++)
 200         printf ("e");
 201       printf (" (GET_CODE (operand%d)", XINT (x, 0));
 202       printf (", %smode", GET_MODE_NAME (GET_MODE (x)));
 203       for (i = 0; i < XVECLEN (x, 2); i++)
 204         {
 205           printf (",\n\t\t");
 206           gen_exp (XVECEXP (x, 2, i), subroutine_type, used);
 207         }
 208       printf (")");
 209       return;
 210
 211     case MATCH_PARALLEL:
 212     case MATCH_PAR_DUP:
 213       printf ("operand%d", XINT (x, 0));
 214       return;
 215
 216     case MATCH_SCRATCH:
 217       gen_rtx_scratch (x, subroutine_type);
 218       return;
 219
 220     case ADDRESS:
 221       fatal ("ADDRESS expression code used in named instruction pattern");
 222
 223     case PC:
 224       printf ("pc_rtx");
 225       return;
 226     case CLOBBER:
 227       if (REG_P (XEXP (x, 0)))
 228         {
 229           printf ("gen_hard_reg_clobber (%smode, %i)", GET_MODE_NAME (GET_MODE (XEXP (x, 0))),
 230                                                      REGNO (XEXP (x, 0)));
 231           return;
 232         }
 233       break;
 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 (-MAX_SAVED_CONST_INT <= INTVAL (x)
 247           && INTVAL (x) <= MAX_SAVED_CONST_INT)
 248         printf ("const_int_rtx[MAX_SAVED_CONST_INT + (%d)]",
 249                 (int) INTVAL (x));
 250       else if (INTVAL (x) == STORE_FLAG_VALUE)
 251         printf ("const_true_rtx");
 252       else
 253         {
 254           printf ("GEN_INT (");
 255           printf (HOST_WIDE_INT_PRINT_DEC_C, INTVAL (x));
 256           printf (")");
 257         }
 258       return;
 259
 260     case CONST_DOUBLE:
 261       /* These shouldn't be written in MD files.  Instead, the appropriate
 262          routines in varasm.c should be called.  */
 263       gcc_unreachable ();
 264
 265     default:
 266       break;
 267     }
 268
 269   printf ("gen_rtx_");
 270   print_code (code);
 271   printf (" (%smode", GET_MODE_NAME (GET_MODE (x)));
 272
 273   fmt = GET_RTX_FORMAT (code);
 274   len = GET_RTX_LENGTH (code);
 275   for (i = 0; i < len; i++)
 276     {
 277       if (fmt[i] == '0')
 278         break;
 279       printf (",\n\t");
 280       switch (fmt[i])
 281         {
 282         case 'e': case 'u':
 283           gen_exp (XEXP (x, i), subroutine_type, used);
 284           break;
 285
 286         case 'i':
 287           printf ("%u", XINT (x, i));
 288           break;
 289
 290         case 's':
 291           printf ("\"%s\"", XSTR (x, i));
 292           break;
 293
 294         case 'E':
 295           {
 296             int j;
 297             printf ("gen_rtvec (%d", XVECLEN (x, i));
 298             for (j = 0; j < XVECLEN (x, i); j++)
 299               {
 300                 printf (",\n\t\t");
 301                 gen_exp (XVECEXP (x, i, j), subroutine_type, used);
 302               }
 303             printf (")");
 304             break;
 305           }
 306
 307         default:
 308           gcc_unreachable ();
 309         }
 310     }
 311   printf (")");
 312 }
 313 \f
 314 /* Generate the `gen_...' function for a DEFINE_INSN.  */
 315
 316 static void
 317 gen_insn (rtx insn, int lineno)
 318 {
 319   int operands;
 320   int i;
 321
 322   /* See if the pattern for this insn ends with a group of CLOBBERs of (hard)
 323      registers or MATCH_SCRATCHes.  If so, store away the information for
 324      later.  */
 325
 326   if (XVEC (insn, 1))
 327     {
 328       int has_hard_reg = 0;
 329
 330       for (i = XVECLEN (insn, 1) - 1; i > 0; i--)
 331         {
 332           if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER)
 333             break;
 334
 335           if (REG_P (XEXP (XVECEXP (insn, 1, i), 0)))
 336             has_hard_reg = 1;
 337           else if (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH)
 338             break;
 339         }
 340
 341       if (i != XVECLEN (insn, 1) - 1)
 342         {
 343           struct clobber_pat *p;
 344           struct clobber_ent *link = XNEW (struct clobber_ent);
 345           int j;
 346
 347           link->code_number = insn_code_number;
 348
 349           /* See if any previous CLOBBER_LIST entry is the same as this
 350              one.  */
 351
 352           for (p = clobber_list; p; p = p->next)
 353             {
 354               if (p->first_clobber != i + 1
 355                   || XVECLEN (p->pattern, 1) != XVECLEN (insn, 1))
 356                 continue;
 357
 358               for (j = i + 1; j < XVECLEN (insn, 1); j++)
 359                 {
 360                   rtx old = XEXP (XVECEXP (p->pattern, 1, j), 0);
 361                   rtx new = XEXP (XVECEXP (insn, 1, j), 0);
 362
 363                   /* OLD and NEW are the same if both are to be a SCRATCH
 364                      of the same mode,
 365                      or if both are registers of the same mode and number.  */
 366                   if (! (GET_MODE (old) == GET_MODE (new)
 367                          && ((GET_CODE (old) == MATCH_SCRATCH
 368                               && GET_CODE (new) == MATCH_SCRATCH)
 369                              || (REG_P (old) && REG_P (new)
 370                                  && REGNO (old) == REGNO (new)))))
 371                     break;
 372                 }
 373
 374               if (j == XVECLEN (insn, 1))
 375                 break;
 376             }
 377
 378           if (p == 0)
 379             {
 380               p = XNEW (struct clobber_pat);
 381
 382               p->insns = 0;
 383               p->pattern = insn;
 384               p->first_clobber = i + 1;
 385               p->next = clobber_list;
 386               p->has_hard_reg = has_hard_reg;
 387               clobber_list = p;
 388             }
 389
 390           link->next = p->insns;
 391           p->insns = link;
 392         }
 393     }
 394
 395   /* Don't mention instructions whose names are the null string
 396      or begin with '*'.  They are in the machine description just
 397      to be recognized.  */
 398   if (XSTR (insn, 0)[0] == 0 || XSTR (insn, 0)[0] == '*')
 399     return;
 400
 401   printf ("/* %s:%d */\n", read_rtx_filename, lineno);
 402
 403   /* Find out how many operands this function has.  */
 404   operands = max_operand_vec (insn, 1);
 405   if (max_dup_opno >= operands)
 406     fatal ("match_dup operand number has no match_operand");
 407
 408   /* Output the function name and argument declarations.  */
 409   printf ("rtx\ngen_%s (", XSTR (insn, 0));
 410   if (operands)
 411     for (i = 0; i < operands; i++)
 412       if (i)
 413         printf (",\n\trtx operand%d ATTRIBUTE_UNUSED", i);
 414       else
 415         printf ("rtx operand%d ATTRIBUTE_UNUSED", i);
 416   else
 417     printf ("void");
 418   printf (")\n");
 419   printf ("{\n");
 420
 421   /* Output code to construct and return the rtl for the instruction body.  */
 422
 423   if (XVECLEN (insn, 1) == 1)
 424     {
 425       printf ("  return ");
 426       gen_exp (XVECEXP (insn, 1, 0), DEFINE_INSN, NULL);
 427       printf (";\n}\n\n");
 428     }
 429   else
 430     {
 431       char *used = XCNEWVEC (char, operands);
 432
 433       printf ("  return gen_rtx_PARALLEL (VOIDmode, gen_rtvec (%d",
 434               XVECLEN (insn, 1));
 435
 436       for (i = 0; i < XVECLEN (insn, 1); i++)
 437         {
 438           printf (",\n\t\t");
 439           gen_exp (XVECEXP (insn, 1, i), DEFINE_INSN, used);
 440         }
 441       printf ("));\n}\n\n");
 442       XDELETEVEC (used);
 443     }
 444 }
 445 \f
 446 /* Generate the `gen_...' function for a DEFINE_EXPAND.  */
 447
 448 static void
 449 gen_expand (rtx expand)
 450 {
 451   int operands;
 452   int i;
 453   char *used;
 454
 455   if (strlen (XSTR (expand, 0)) == 0)
 456     fatal ("define_expand lacks a name");
 457   if (XVEC (expand, 1) == 0)
 458     fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0));
 459
 460   /* Find out how many operands this function has.  */
 461   operands = max_operand_vec (expand, 1);
 462
 463   /* Output the function name and argument declarations.  */
 464   printf ("rtx\ngen_%s (", XSTR (expand, 0));
 465   if (operands)
 466     for (i = 0; i < operands; i++)
 467       if (i)
 468         printf (",\n\trtx operand%d", i);
 469       else
 470         printf ("rtx operand%d", i);
 471   else
 472     printf ("void");
 473   printf (")\n");
 474   printf ("{\n");
 475
 476   /* If we don't have any C code to write, only one insn is being written,
 477      and no MATCH_DUPs are present, we can just return the desired insn
 478      like we do for a DEFINE_INSN.  This saves memory.  */
 479   if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0')
 480       && operands > max_dup_opno
 481       && XVECLEN (expand, 1) == 1)
 482     {
 483       printf ("  return ");
 484       gen_exp (XVECEXP (expand, 1, 0), DEFINE_EXPAND, NULL);
 485       printf (";\n}\n\n");
 486       return;
 487     }
 488
 489   /* For each operand referred to only with MATCH_DUPs,
 490      make a local variable.  */
 491   for (i = operands; i <= max_dup_opno; i++)
 492     printf ("  rtx operand%d;\n", i);
 493   for (; i <= max_scratch_opno; i++)
 494     printf ("  rtx operand%d ATTRIBUTE_UNUSED;\n", i);
 495   printf ("  rtx _val = 0;\n");
 496   printf ("  start_sequence ();\n");
 497
 498   /* The fourth operand of DEFINE_EXPAND is some code to be executed
 499      before the actual construction.
 500      This code expects to refer to `operands'
 501      just as the output-code in a DEFINE_INSN does,
 502      but here `operands' is an automatic array.
 503      So copy the operand values there before executing it.  */
 504   if (XSTR (expand, 3) && *XSTR (expand, 3))
 505     {
 506       printf ("  {\n");
 507       if (operands > 0 || max_dup_opno >= 0 || max_scratch_opno >= 0)
 508         printf ("    rtx operands[%d];\n",
 509             MAX (operands, MAX (max_scratch_opno, max_dup_opno) + 1));
 510       /* Output code to copy the arguments into `operands'.  */
 511       for (i = 0; i < operands; i++)
 512         printf ("    operands[%d] = operand%d;\n", i, i);
 513
 514       /* Output the special code to be executed before the sequence
 515          is generated.  */
 516       print_rtx_ptr_loc (XSTR (expand, 3));
 517       printf ("%s\n", XSTR (expand, 3));
 518
 519       /* Output code to copy the arguments back out of `operands'
 520          (unless we aren't going to use them at all).  */
 521       if (XVEC (expand, 1) != 0)
 522         {
 523           for (i = 0; i < operands; i++)
 524             printf ("    operand%d = operands[%d];\n", i, i);
 525           for (; i <= max_dup_opno; i++)
 526             printf ("    operand%d = operands[%d];\n", i, i);
 527           for (; i <= max_scratch_opno; i++)
 528             printf ("    operand%d = operands[%d];\n", i, i);
 529         }
 530       printf ("  }\n");
 531     }
 532
 533   /* Output code to construct the rtl for the instruction bodies.
 534      Use emit_insn to add them to the sequence being accumulated.
 535      But don't do this if the user's code has set `no_more' nonzero.  */
 536
 537   used = XCNEWVEC (char,
 538                    MAX (operands, MAX (max_scratch_opno, max_dup_opno) + 1));
 539
 540   for (i = 0; i < XVECLEN (expand, 1); i++)
 541     {
 542       rtx next = XVECEXP (expand, 1, i);
 543       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 544           || (GET_CODE (next) == PARALLEL
 545               && ((GET_CODE (XVECEXP (next, 0, 0)) == SET
 546                    && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 547                   || GET_CODE (XVECEXP (next, 0, 0)) == RETURN))
 548           || GET_CODE (next) == RETURN)
 549         printf ("  emit_jump_insn (");
 550       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 551                || GET_CODE (next) == CALL
 552                || (GET_CODE (next) == PARALLEL
 553                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 554                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 555                || (GET_CODE (next) == PARALLEL
 556                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 557         printf ("  emit_call_insn (");
 558       else if (LABEL_P (next))
 559         printf ("  emit_label (");
 560       else if (GET_CODE (next) == MATCH_OPERAND
 561                || GET_CODE (next) == MATCH_DUP
 562                || GET_CODE (next) == MATCH_OPERATOR
 563                || GET_CODE (next) == MATCH_OP_DUP
 564                || GET_CODE (next) == MATCH_PARALLEL
 565                || GET_CODE (next) == MATCH_PAR_DUP
 566                || GET_CODE (next) == PARALLEL)
 567         printf ("  emit (");
 568       else
 569         printf ("  emit_insn (");
 570       gen_exp (next, DEFINE_EXPAND, used);
 571       printf (");\n");
 572       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 573           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 574         printf ("  emit_barrier ();");
 575     }
 576
 577   XDELETEVEC (used);
 578
 579   /* Call `get_insns' to extract the list of all the
 580      insns emitted within this gen_... function.  */
 581
 582   printf ("  _val = get_insns ();\n");
 583   printf ("  end_sequence ();\n");
 584   printf ("  return _val;\n}\n\n");
 585 }
 586
 587 /* Like gen_expand, but generates insns resulting from splitting SPLIT.  */
 588
 589 static void
 590 gen_split (rtx split)
 591 {
 592   int i;
 593   int operands;
 594   const char *const name =
 595     ((GET_CODE (split) == DEFINE_PEEPHOLE2) ? "peephole2" : "split");
 596   const char *unused;
 597   char *used;
 598
 599   if (XVEC (split, 0) == 0)
 600     fatal ("define_%s (definition %d) lacks a pattern", name,
 601            insn_index_number);
 602   else if (XVEC (split, 2) == 0)
 603     fatal ("define_%s (definition %d) lacks a replacement pattern", name,
 604            insn_index_number);
 605
 606   /* Find out how many operands this function has.  */
 607
 608   max_operand_vec (split, 2);
 609   operands = MAX (max_opno, MAX (max_dup_opno, max_scratch_opno)) + 1;
 610   unused = (operands == 0 ? " ATTRIBUTE_UNUSED" : "");
 611   used = XCNEWVEC (char, operands);
 612
 613   /* Output the prototype, function name and argument declarations.  */
 614   if (GET_CODE (split) == DEFINE_PEEPHOLE2)
 615     {
 616       printf ("extern rtx gen_%s_%d (rtx, rtx *);\n",
 617               name, insn_code_number);
 618       printf ("rtx\ngen_%s_%d (rtx curr_insn ATTRIBUTE_UNUSED, rtx *operands%s)\n",
 619               name, insn_code_number, unused);
 620     }
 621   else
 622     {
 623       printf ("extern rtx gen_split_%d (rtx, rtx *);\n", insn_code_number);
 624       printf ("rtx\ngen_split_%d (rtx curr_insn ATTRIBUTE_UNUSED, rtx *operands%s)\n",
 625               insn_code_number, unused);
 626     }
 627   printf ("{\n");
 628
 629   /* Declare all local variables.  */
 630   for (i = 0; i < operands; i++)
 631     printf ("  rtx operand%d;\n", i);
 632   printf ("  rtx _val = 0;\n");
 633
 634   if (GET_CODE (split) == DEFINE_PEEPHOLE2)
 635     output_peephole2_scratches (split);
 636
 637   printf ("  start_sequence ();\n");
 638
 639   /* The fourth operand of DEFINE_SPLIT is some code to be executed
 640      before the actual construction.  */
 641
 642   if (XSTR (split, 3))
 643     {
 644       print_rtx_ptr_loc (XSTR (split, 3));
 645       printf ("%s\n", XSTR (split, 3));
 646     }
 647
 648   /* Output code to copy the arguments back out of `operands'  */
 649   for (i = 0; i < operands; i++)
 650     printf ("  operand%d = operands[%d];\n", i, i);
 651
 652   /* Output code to construct the rtl for the instruction bodies.
 653      Use emit_insn to add them to the sequence being accumulated.
 654      But don't do this if the user's code has set `no_more' nonzero.  */
 655
 656   for (i = 0; i < XVECLEN (split, 2); i++)
 657     {
 658       rtx next = XVECEXP (split, 2, i);
 659       if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC)
 660           || (GET_CODE (next) == PARALLEL
 661               && GET_CODE (XVECEXP (next, 0, 0)) == SET
 662               && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC)
 663           || GET_CODE (next) == RETURN)
 664         printf ("  emit_jump_insn (");
 665       else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL)
 666                || GET_CODE (next) == CALL
 667                || (GET_CODE (next) == PARALLEL
 668                    && GET_CODE (XVECEXP (next, 0, 0)) == SET
 669                    && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL)
 670                || (GET_CODE (next) == PARALLEL
 671                    && GET_CODE (XVECEXP (next, 0, 0)) == CALL))
 672         printf ("  emit_call_insn (");
 673       else if (LABEL_P (next))
 674         printf ("  emit_label (");
 675       else if (GET_CODE (next) == MATCH_OPERAND
 676                || GET_CODE (next) == MATCH_OPERATOR
 677                || GET_CODE (next) == MATCH_PARALLEL
 678                || GET_CODE (next) == MATCH_OP_DUP
 679                || GET_CODE (next) == MATCH_DUP
 680                || GET_CODE (next) == PARALLEL)
 681         printf ("  emit (");
 682       else
 683         printf ("  emit_insn (");
 684       gen_exp (next, GET_CODE (split), used);
 685       printf (");\n");
 686       if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC
 687           && GET_CODE (SET_SRC (next)) == LABEL_REF)
 688         printf ("  emit_barrier ();");
 689     }
 690
 691   /* Call `get_insns' to make a list of all the
 692      insns emitted within this gen_... function.  */
 693
 694   printf ("  _val = get_insns ();\n");
 695   printf ("  end_sequence ();\n");
 696   printf ("  return _val;\n}\n\n");
 697
 698   free (used);
 699 }
 700 \f
 701 /* Write a function, `add_clobbers', that is given a PARALLEL of sufficient
 702    size for the insn and an INSN_CODE, and inserts the required CLOBBERs at
 703    the end of the vector.  */
 704
 705 static void
 706 output_add_clobbers (void)
 707 {
 708   struct clobber_pat *clobber;
 709   struct clobber_ent *ent;
 710   int i;
 711
 712   printf ("\n\nvoid\nadd_clobbers (rtx pattern ATTRIBUTE_UNUSED, int insn_code_number)\n");
 713   printf ("{\n");
 714   printf ("  switch (insn_code_number)\n");
 715   printf ("    {\n");
 716
 717   for (clobber = clobber_list; clobber; clobber = clobber->next)
 718     {
 719       for (ent = clobber->insns; ent; ent = ent->next)
 720         printf ("    case %d:\n", ent->code_number);
 721
 722       for (i = clobber->first_clobber; i < XVECLEN (clobber->pattern, 1); i++)
 723         {
 724           printf ("      XVECEXP (pattern, 0, %d) = ", i);
 725           gen_exp (XVECEXP (clobber->pattern, 1, i),
 726                    GET_CODE (clobber->pattern), NULL);
 727           printf (";\n");
 728         }
 729
 730       printf ("      break;\n\n");
 731     }
 732
 733   printf ("    default:\n");
 734   printf ("      gcc_unreachable ();\n");
 735   printf ("    }\n");
 736   printf ("}\n");
 737 }
 738 \f
 739 /* Write a function, `added_clobbers_hard_reg_p' that is given an insn_code
 740    number that will have clobbers added (as indicated by `recog') and returns
 741    1 if those include a clobber of a hard reg or 0 if all of them just clobber
 742    SCRATCH.  */
 743
 744 static void
 745 output_added_clobbers_hard_reg_p (void)
 746 {
 747   struct clobber_pat *clobber;
 748   struct clobber_ent *ent;
 749   int clobber_p, used;
 750
 751   printf ("\n\nint\nadded_clobbers_hard_reg_p (int insn_code_number)\n");
 752   printf ("{\n");
 753   printf ("  switch (insn_code_number)\n");
 754   printf ("    {\n");
 755
 756   for (clobber_p = 0; clobber_p <= 1; clobber_p++)
 757     {
 758       used = 0;
 759       for (clobber = clobber_list; clobber; clobber = clobber->next)
 760         if (clobber->has_hard_reg == clobber_p)
 761           for (ent = clobber->insns; ent; ent = ent->next)
 762             {
 763               printf ("    case %d:\n", ent->code_number);
 764               used++;
 765             }
 766
 767       if (used)
 768         printf ("      return %d;\n\n", clobber_p);
 769     }
 770
 771   printf ("    default:\n");
 772   printf ("      gcc_unreachable ();\n");
 773   printf ("    }\n");
 774   printf ("}\n");
 775 }
 776 \f
 777 /* Generate code to invoke find_free_register () as needed for the
 778    scratch registers used by the peephole2 pattern in SPLIT.  */
 779
 780 static void
 781 output_peephole2_scratches (rtx split)
 782 {
 783   int i;
 784   int insn_nr = 0;
 785
 786   printf ("  HARD_REG_SET _regs_allocated;\n");
 787   printf ("  CLEAR_HARD_REG_SET (_regs_allocated);\n");
 788
 789   for (i = 0; i < XVECLEN (split, 0); i++)
 790     {
 791       rtx elt = XVECEXP (split, 0, i);
 792       if (GET_CODE (elt) == MATCH_SCRATCH)
 793         {
 794           int last_insn_nr = insn_nr;
 795           int cur_insn_nr = insn_nr;
 796           int j;
 797           for (j = i + 1; j < XVECLEN (split, 0); j++)
 798             if (GET_CODE (XVECEXP (split, 0, j)) == MATCH_DUP)
 799               {
 800                 if (XINT (XVECEXP (split, 0, j), 0) == XINT (elt, 0))
 801                   last_insn_nr = cur_insn_nr;
 802               }
 803             else if (GET_CODE (XVECEXP (split, 0, j)) != MATCH_SCRATCH)
 804               cur_insn_nr++;
 805
 806           printf ("  if ((operands[%d] = peep2_find_free_register (%d, %d, \"%s\", %smode, &_regs_allocated)) == NULL_RTX)\n\
 807     return NULL;\n",
 808                   XINT (elt, 0),
 809                   insn_nr, last_insn_nr,
 810                   XSTR (elt, 1),
 811                   GET_MODE_NAME (GET_MODE (elt)));
 812
 813         }
 814       else if (GET_CODE (elt) != MATCH_DUP)
 815         insn_nr++;
 816     }
 817 }
 818
 819 int
 820 main (int argc, char **argv)
 821 {
 822   rtx desc;
 823
 824   progname = "genemit";
 825
 826   if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE)
 827     return (FATAL_EXIT_CODE);
 828
 829   /* Assign sequential codes to all entries in the machine description
 830      in parallel with the tables in insn-output.c.  */
 831
 832   insn_code_number = 0;
 833   insn_index_number = 0;
 834
 835   printf ("/* Generated automatically by the program `genemit'\n\
 836 from the machine description file `md'.  */\n\n");
 837
 838   printf ("#include \"config.h\"\n");
 839   printf ("#include \"system.h\"\n");
 840   printf ("#include \"coretypes.h\"\n");
 841   printf ("#include \"tm.h\"\n");
 842   printf ("#include \"rtl.h\"\n");
 843   printf ("#include \"tm_p.h\"\n");
 844   printf ("#include \"function.h\"\n");
 845   printf ("#include \"expr.h\"\n");
 846   printf ("#include \"optabs.h\"\n");
 847   printf ("#include \"real.h\"\n");
 848   printf ("#include \"flags.h\"\n");
 849   printf ("#include \"output.h\"\n");
 850   printf ("#include \"insn-config.h\"\n");
 851   printf ("#include \"hard-reg-set.h\"\n");
 852   printf ("#include \"recog.h\"\n");
 853   printf ("#include \"resource.h\"\n");
 854   printf ("#include \"reload.h\"\n");
 855   printf ("#include \"toplev.h\"\n");
 856   printf ("#include \"tm-constrs.h\"\n");
 857   printf ("#include \"ggc.h\"\n\n");
 858   printf ("#include \"basic-block.h\"\n\n");
 859   printf ("#define FAIL return (end_sequence (), _val)\n");
 860   printf ("#define DONE return (_val = get_insns (), end_sequence (), _val)\n\n");
 861
 862   /* Read the machine description.  */
 863
 864   while (1)
 865     {
 866       int line_no;
 867
 868       desc = read_md_rtx (&line_no, &insn_code_number);
 869       if (desc == NULL)
 870         break;
 871
 872       switch (GET_CODE (desc))
 873         {
 874         case DEFINE_INSN:
 875           gen_insn (desc, line_no);
 876           break;
 877
 878         case DEFINE_EXPAND:
 879           printf ("/* %s:%d */\n", read_rtx_filename, line_no);
 880           gen_expand (desc);
 881           break;
 882
 883         case DEFINE_SPLIT:
 884           printf ("/* %s:%d */\n", read_rtx_filename, line_no);
 885           gen_split (desc);
 886           break;
 887
 888         case DEFINE_PEEPHOLE2:
 889           printf ("/* %s:%d */\n", read_rtx_filename, line_no);
 890           gen_split (desc);
 891           break;
 892
 893         default:
 894           break;
 895         }
 896       ++insn_index_number;
 897     }
 898
 899   /* Write out the routines to add CLOBBERs to a pattern and say whether they
 900      clobber a hard reg.  */
 901   output_add_clobbers ();
 902   output_added_clobbers_hard_reg_p ();
 903
 904   fflush (stdout);
 905   return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE);
 906 }