genemit.c revision 90075
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 5This file is part of GCC. 6 7GCC is free software; you can redistribute it and/or modify it under 8the terms of the GNU General Public License as published by the Free 9Software Foundation; either version 2, or (at your option) any later 10version. 11 12GCC is distributed in the hope that it will be useful, but WITHOUT ANY 13WARRANTY; without even the implied warranty of MERCHANTABILITY or 14FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15for more details. 16 17You should have received a copy of the GNU General Public License 18along with GCC; see the file COPYING. If not, write to the Free 19Software Foundation, 59 Temple Place - Suite 330, Boston, MA 2002111-1307, 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 30static int max_opno; 31static int max_dup_opno; 32static int max_scratch_opno; 33static int register_constraints; 34static int insn_code_number; 35static 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 41struct 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 52struct clobber_ent 53{ 54 int code_number; /* Counts only insns. */ 55 struct clobber_ent *next; 56}; 57 58static void max_operand_1 PARAMS ((rtx)); 59static int max_operand_vec PARAMS ((rtx, int)); 60static void print_code PARAMS ((RTX_CODE)); 61static void gen_exp PARAMS ((rtx, enum rtx_code)); 62static void gen_insn PARAMS ((rtx)); 63static void gen_expand PARAMS ((rtx)); 64static void gen_split PARAMS ((rtx)); 65static void output_add_clobbers PARAMS ((void)); 66static void output_added_clobbers_hard_reg_p PARAMS ((void)); 67static void gen_rtx_scratch PARAMS ((rtx, enum rtx_code)); 68static void output_peephole2_scratches PARAMS ((rtx)); 69 70 71static void 72max_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 112static int 113max_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 130static void 131print_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 139static void 140gen_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 157static void 158gen_exp (x, subroutine_type) 159 rtx x; 160 enum rtx_code subroutine_type; 161{ 162 RTX_CODE code; 163 int i; 164 int len; 165 const char *fmt; 166 167 if (x == 0) 168 { 169 printf ("NULL_RTX"); 170 return; 171 } 172 173 code = GET_CODE (x); 174 175 switch (code) 176 { 177 case MATCH_OPERAND: 178 case MATCH_DUP: 179 printf ("operand%d", XINT (x, 0)); 180 return; 181 182 case MATCH_OP_DUP: 183 printf ("gen_rtx (GET_CODE (operand%d), ", XINT (x, 0)); 184 if (GET_MODE (x) == VOIDmode) 185 printf ("GET_MODE (operand%d)", XINT (x, 0)); 186 else 187 printf ("%smode", GET_MODE_NAME (GET_MODE (x))); 188 for (i = 0; i < XVECLEN (x, 1); i++) 189 { 190 printf (",\n\t\t"); 191 gen_exp (XVECEXP (x, 1, i), subroutine_type); 192 } 193 printf (")"); 194 return; 195 196 case MATCH_OPERATOR: 197 printf ("gen_rtx (GET_CODE (operand%d)", XINT (x, 0)); 198 printf (", %smode", GET_MODE_NAME (GET_MODE (x))); 199 for (i = 0; i < XVECLEN (x, 2); i++) 200 { 201 printf (",\n\t\t"); 202 gen_exp (XVECEXP (x, 2, i), subroutine_type); 203 } 204 printf (")"); 205 return; 206 207 case MATCH_PARALLEL: 208 case MATCH_PAR_DUP: 209 printf ("operand%d", XINT (x, 0)); 210 return; 211 212 case MATCH_SCRATCH: 213 gen_rtx_scratch (x, subroutine_type); 214 return; 215 216 case ADDRESS: 217 fatal ("ADDRESS expression code used in named instruction pattern"); 218 219 case PC: 220 printf ("pc_rtx"); 221 return; 222 223 case CC0: 224 printf ("cc0_rtx"); 225 return; 226 227 case CONST_INT: 228 if (INTVAL (x) == 0) 229 printf ("const0_rtx"); 230 else if (INTVAL (x) == 1) 231 printf ("const1_rtx"); 232 else if (INTVAL (x) == -1) 233 printf ("constm1_rtx"); 234 else if (INTVAL (x) == STORE_FLAG_VALUE) 235 printf ("const_true_rtx"); 236 else 237 { 238 printf ("GEN_INT ("); 239 printf (HOST_WIDE_INT_PRINT_DEC, INTVAL (x)); 240 printf (")"); 241 } 242 return; 243 244 case CONST_DOUBLE: 245 /* These shouldn't be written in MD files. Instead, the appropriate 246 routines in varasm.c should be called. */ 247 abort (); 248 249 default: 250 break; 251 } 252 253 printf ("gen_rtx_"); 254 print_code (code); 255 printf (" (%smode", GET_MODE_NAME (GET_MODE (x))); 256 257 fmt = GET_RTX_FORMAT (code); 258 len = GET_RTX_LENGTH (code); 259 for (i = 0; i < len; i++) 260 { 261 if (fmt[i] == '0') 262 break; 263 printf (",\n\t"); 264 if (fmt[i] == 'e' || fmt[i] == 'u') 265 gen_exp (XEXP (x, i), subroutine_type); 266 else if (fmt[i] == 'i') 267 printf ("%u", XINT (x, i)); 268 else if (fmt[i] == 's') 269 printf ("\"%s\"", XSTR (x, i)); 270 else if (fmt[i] == 'E') 271 { 272 int j; 273 printf ("gen_rtvec (%d", XVECLEN (x, i)); 274 for (j = 0; j < XVECLEN (x, i); j++) 275 { 276 printf (",\n\t\t"); 277 gen_exp (XVECEXP (x, i, j), subroutine_type); 278 } 279 printf (")"); 280 } 281 else 282 abort (); 283 } 284 printf (")"); 285} 286 287/* Generate the `gen_...' function for a DEFINE_INSN. */ 288 289static void 290gen_insn (insn) 291 rtx insn; 292{ 293 int operands; 294 int i; 295 296 /* See if the pattern for this insn ends with a group of CLOBBERs of (hard) 297 registers or MATCH_SCRATCHes. If so, store away the information for 298 later. */ 299 300 if (XVEC (insn, 1)) 301 { 302 int has_hard_reg = 0; 303 304 for (i = XVECLEN (insn, 1) - 1; i > 0; i--) 305 { 306 if (GET_CODE (XVECEXP (insn, 1, i)) != CLOBBER) 307 break; 308 309 if (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) == REG) 310 has_hard_reg = 1; 311 else if (GET_CODE (XEXP (XVECEXP (insn, 1, i), 0)) != MATCH_SCRATCH) 312 break; 313 } 314 315 if (i != XVECLEN (insn, 1) - 1) 316 { 317 struct clobber_pat *p; 318 struct clobber_ent *link 319 = (struct clobber_ent *) xmalloc (sizeof (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 = XEXP (XVECEXP (p->pattern, 1, j), 0); 336 rtx new = XEXP (XVECEXP (insn, 1, j), 0); 337 338 /* OLD and NEW are the same if both are to be a SCRATCH 339 of the same mode, 340 or if both are registers of the same mode and number. */ 341 if (! (GET_MODE (old) == GET_MODE (new) 342 && ((GET_CODE (old) == MATCH_SCRATCH 343 && GET_CODE (new) == MATCH_SCRATCH) 344 || (GET_CODE (old) == REG && GET_CODE (new) == REG 345 && REGNO (old) == REGNO (new))))) 346 break; 347 } 348 349 if (j == XVECLEN (insn, 1)) 350 break; 351 } 352 353 if (p == 0) 354 { 355 p = (struct clobber_pat *) xmalloc (sizeof (struct clobber_pat)); 356 357 p->insns = 0; 358 p->pattern = insn; 359 p->first_clobber = i + 1; 360 p->next = clobber_list; 361 p->has_hard_reg = has_hard_reg; 362 clobber_list = p; 363 } 364 365 link->next = p->insns; 366 p->insns = link; 367 } 368 } 369 370 /* Don't mention instructions whose names are the null string 371 or begin with '*'. They are in the machine description just 372 to be recognized. */ 373 if (XSTR (insn, 0)[0] == 0 || XSTR (insn, 0)[0] == '*') 374 return; 375 376 /* Find out how many operands this function has, 377 and also whether any of them have register constraints. */ 378 register_constraints = 0; 379 operands = max_operand_vec (insn, 1); 380 if (max_dup_opno >= operands) 381 fatal ("match_dup operand number has no match_operand"); 382 383 /* Output the function name and argument declarations. */ 384 printf ("rtx\ngen_%s (", XSTR (insn, 0)); 385 for (i = 0; i < operands; i++) 386 if (i) 387 printf (", operand%d", i); 388 else 389 printf ("operand%d", i); 390 printf (")\n"); 391 for (i = 0; i < operands; i++) 392 printf (" rtx operand%d;\n", i); 393 printf ("{\n"); 394 395 /* Output code to construct and return the rtl for the instruction body */ 396 397 if (XVECLEN (insn, 1) == 1) 398 { 399 printf (" return "); 400 gen_exp (XVECEXP (insn, 1, 0), DEFINE_INSN); 401 printf (";\n}\n\n"); 402 } 403 else 404 { 405 printf (" return gen_rtx_PARALLEL (VOIDmode, gen_rtvec (%d", 406 XVECLEN (insn, 1)); 407 408 for (i = 0; i < XVECLEN (insn, 1); i++) 409 { 410 printf (",\n\t\t"); 411 gen_exp (XVECEXP (insn, 1, i), DEFINE_INSN); 412 } 413 printf ("));\n}\n\n"); 414 } 415} 416 417/* Generate the `gen_...' function for a DEFINE_EXPAND. */ 418 419static void 420gen_expand (expand) 421 rtx expand; 422{ 423 int operands; 424 int i; 425 426 if (strlen (XSTR (expand, 0)) == 0) 427 fatal ("define_expand lacks a name"); 428 if (XVEC (expand, 1) == 0) 429 fatal ("define_expand for %s lacks a pattern", XSTR (expand, 0)); 430 431 /* Find out how many operands this function has, 432 and also whether any of them have register constraints. */ 433 register_constraints = 0; 434 435 operands = max_operand_vec (expand, 1); 436 437 /* Output the function name and argument declarations. */ 438 printf ("rtx\ngen_%s (", XSTR (expand, 0)); 439 for (i = 0; i < operands; i++) 440 if (i) 441 printf (", operand%d", i); 442 else 443 printf ("operand%d", i); 444 printf (")\n"); 445 for (i = 0; i < operands; i++) 446 printf (" rtx operand%d;\n", i); 447 printf ("{\n"); 448 449 /* If we don't have any C code to write, only one insn is being written, 450 and no MATCH_DUPs are present, we can just return the desired insn 451 like we do for a DEFINE_INSN. This saves memory. */ 452 if ((XSTR (expand, 3) == 0 || *XSTR (expand, 3) == '\0') 453 && operands > max_dup_opno 454 && XVECLEN (expand, 1) == 1) 455 { 456 printf (" return "); 457 gen_exp (XVECEXP (expand, 1, 0), DEFINE_EXPAND); 458 printf (";\n}\n\n"); 459 return; 460 } 461 462 /* For each operand referred to only with MATCH_DUPs, 463 make a local variable. */ 464 for (i = operands; i <= max_dup_opno; i++) 465 printf (" rtx operand%d;\n", i); 466 for (; i <= max_scratch_opno; i++) 467 printf (" rtx operand%d ATTRIBUTE_UNUSED;\n", i); 468 printf (" rtx _val = 0;\n"); 469 printf (" start_sequence ();\n"); 470 471 /* The fourth operand of DEFINE_EXPAND is some code to be executed 472 before the actual construction. 473 This code expects to refer to `operands' 474 just as the output-code in a DEFINE_INSN does, 475 but here `operands' is an automatic array. 476 So copy the operand values there before executing it. */ 477 if (XSTR (expand, 3) && *XSTR (expand, 3)) 478 { 479 printf (" {\n"); 480 if (operands > 0 || max_dup_opno >= 0 || max_scratch_opno >= 0) 481 printf (" rtx operands[%d];\n", 482 MAX (operands, MAX (max_scratch_opno, max_dup_opno) + 1)); 483 /* Output code to copy the arguments into `operands'. */ 484 for (i = 0; i < operands; i++) 485 printf (" operands[%d] = operand%d;\n", i, i); 486 487 /* Output the special code to be executed before the sequence 488 is generated. */ 489 printf ("%s\n", XSTR (expand, 3)); 490 491 /* Output code to copy the arguments back out of `operands' 492 (unless we aren't going to use them at all). */ 493 if (XVEC (expand, 1) != 0) 494 { 495 for (i = 0; i < operands; i++) 496 printf (" operand%d = operands[%d];\n", i, i); 497 for (; i <= max_dup_opno; i++) 498 printf (" operand%d = operands[%d];\n", i, i); 499 for (; i <= max_scratch_opno; i++) 500 printf (" operand%d = operands[%d];\n", i, i); 501 } 502 printf (" }\n"); 503 } 504 505 /* Output code to construct the rtl for the instruction bodies. 506 Use emit_insn to add them to the sequence being accumulated. 507 But don't do this if the user's code has set `no_more' nonzero. */ 508 509 for (i = 0; i < XVECLEN (expand, 1); i++) 510 { 511 rtx next = XVECEXP (expand, 1, i); 512 if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC) 513 || (GET_CODE (next) == PARALLEL 514 && GET_CODE (XVECEXP (next, 0, 0)) == SET 515 && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC) 516 || GET_CODE (next) == RETURN) 517 printf (" emit_jump_insn ("); 518 else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL) 519 || GET_CODE (next) == CALL 520 || (GET_CODE (next) == PARALLEL 521 && GET_CODE (XVECEXP (next, 0, 0)) == SET 522 && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL) 523 || (GET_CODE (next) == PARALLEL 524 && GET_CODE (XVECEXP (next, 0, 0)) == CALL)) 525 printf (" emit_call_insn ("); 526 else if (GET_CODE (next) == CODE_LABEL) 527 printf (" emit_label ("); 528 else if (GET_CODE (next) == MATCH_OPERAND 529 || GET_CODE (next) == MATCH_DUP 530 || GET_CODE (next) == MATCH_OPERATOR 531 || GET_CODE (next) == MATCH_OP_DUP 532 || GET_CODE (next) == MATCH_PARALLEL 533 || GET_CODE (next) == MATCH_PAR_DUP 534 || GET_CODE (next) == PARALLEL) 535 printf (" emit ("); 536 else 537 printf (" emit_insn ("); 538 gen_exp (next, DEFINE_EXPAND); 539 printf (");\n"); 540 if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC 541 && GET_CODE (SET_SRC (next)) == LABEL_REF) 542 printf (" emit_barrier ();"); 543 } 544 545 /* Call `gen_sequence' to make a SEQUENCE out of all the 546 insns emitted within this gen_... function. */ 547 548 printf (" _val = gen_sequence ();\n"); 549 printf (" end_sequence ();\n"); 550 printf (" return _val;\n}\n\n"); 551} 552 553/* Like gen_expand, but generates a SEQUENCE. */ 554 555static void 556gen_split (split) 557 rtx split; 558{ 559 int i; 560 int operands; 561 const char *const name = 562 ((GET_CODE (split) == DEFINE_PEEPHOLE2) ? "peephole2" : "split"); 563 const char *unused; 564 565 if (XVEC (split, 0) == 0) 566 fatal ("define_%s (definition %d) lacks a pattern", name, 567 insn_index_number); 568 else if (XVEC (split, 2) == 0) 569 fatal ("define_%s (definition %d) lacks a replacement pattern", name, 570 insn_index_number); 571 572 /* Find out how many operands this function has. */ 573 574 max_operand_vec (split, 2); 575 operands = MAX (max_opno, MAX (max_dup_opno, max_scratch_opno)) + 1; 576 unused = (operands == 0 ? " ATTRIBUTE_UNUSED" : ""); 577 578 /* Output the prototype, function name and argument declarations. */ 579 if (GET_CODE (split) == DEFINE_PEEPHOLE2) 580 { 581 printf ("extern rtx gen_%s_%d PARAMS ((rtx, rtx *));\n", 582 name, insn_code_number); 583 printf ("rtx\ngen_%s_%d (curr_insn, operands)\n", 584 name, insn_code_number); 585 printf (" rtx curr_insn ATTRIBUTE_UNUSED;\n"); 586 printf (" rtx *operands%s;\n", unused); 587 } 588 else 589 { 590 printf ("extern rtx gen_split_%d PARAMS ((rtx *));\n", insn_code_number); 591 printf ("rtx\ngen_%s_%d (operands)\n", name, insn_code_number); 592 printf (" rtx *operands%s;\n", unused); 593 } 594 printf ("{\n"); 595 596 /* Declare all local variables. */ 597 for (i = 0; i < operands; i++) 598 printf (" rtx operand%d;\n", i); 599 printf (" rtx _val = 0;\n"); 600 601 if (GET_CODE (split) == DEFINE_PEEPHOLE2) 602 output_peephole2_scratches (split); 603 604 printf (" start_sequence ();\n"); 605 606 /* The fourth operand of DEFINE_SPLIT is some code to be executed 607 before the actual construction. */ 608 609 if (XSTR (split, 3)) 610 printf ("%s\n", XSTR (split, 3)); 611 612 /* Output code to copy the arguments back out of `operands' */ 613 for (i = 0; i < operands; i++) 614 printf (" operand%d = operands[%d];\n", i, i); 615 616 /* Output code to construct the rtl for the instruction bodies. 617 Use emit_insn to add them to the sequence being accumulated. 618 But don't do this if the user's code has set `no_more' nonzero. */ 619 620 for (i = 0; i < XVECLEN (split, 2); i++) 621 { 622 rtx next = XVECEXP (split, 2, i); 623 if ((GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC) 624 || (GET_CODE (next) == PARALLEL 625 && GET_CODE (XVECEXP (next, 0, 0)) == SET 626 && GET_CODE (SET_DEST (XVECEXP (next, 0, 0))) == PC) 627 || GET_CODE (next) == RETURN) 628 printf (" emit_jump_insn ("); 629 else if ((GET_CODE (next) == SET && GET_CODE (SET_SRC (next)) == CALL) 630 || GET_CODE (next) == CALL 631 || (GET_CODE (next) == PARALLEL 632 && GET_CODE (XVECEXP (next, 0, 0)) == SET 633 && GET_CODE (SET_SRC (XVECEXP (next, 0, 0))) == CALL) 634 || (GET_CODE (next) == PARALLEL 635 && GET_CODE (XVECEXP (next, 0, 0)) == CALL)) 636 printf (" emit_call_insn ("); 637 else if (GET_CODE (next) == CODE_LABEL) 638 printf (" emit_label ("); 639 else if (GET_CODE (next) == MATCH_OPERAND 640 || GET_CODE (next) == MATCH_OPERATOR 641 || GET_CODE (next) == MATCH_PARALLEL 642 || GET_CODE (next) == MATCH_OP_DUP 643 || GET_CODE (next) == MATCH_DUP 644 || GET_CODE (next) == PARALLEL) 645 printf (" emit ("); 646 else 647 printf (" emit_insn ("); 648 gen_exp (next, GET_CODE (split)); 649 printf (");\n"); 650 if (GET_CODE (next) == SET && GET_CODE (SET_DEST (next)) == PC 651 && GET_CODE (SET_SRC (next)) == LABEL_REF) 652 printf (" emit_barrier ();"); 653 } 654 655 /* Call `gen_sequence' to make a SEQUENCE out of all the 656 insns emitted within this gen_... function. */ 657 658 printf (" _val = gen_sequence ();\n"); 659 printf (" end_sequence ();\n"); 660 printf (" return _val;\n}\n\n"); 661} 662 663/* Write a function, `add_clobbers', that is given a PARALLEL of sufficient 664 size for the insn and an INSN_CODE, and inserts the required CLOBBERs at 665 the end of the vector. */ 666 667static void 668output_add_clobbers () 669{ 670 struct clobber_pat *clobber; 671 struct clobber_ent *ent; 672 int i; 673 674 printf ("\n\nvoid\nadd_clobbers (pattern, insn_code_number)\n"); 675 printf (" rtx pattern ATTRIBUTE_UNUSED;\n int insn_code_number;\n"); 676 printf ("{\n"); 677 printf (" switch (insn_code_number)\n"); 678 printf (" {\n"); 679 680 for (clobber = clobber_list; clobber; clobber = clobber->next) 681 { 682 for (ent = clobber->insns; ent; ent = ent->next) 683 printf (" case %d:\n", ent->code_number); 684 685 for (i = clobber->first_clobber; i < XVECLEN (clobber->pattern, 1); i++) 686 { 687 printf (" XVECEXP (pattern, 0, %d) = ", i); 688 gen_exp (XVECEXP (clobber->pattern, 1, i), 689 GET_CODE (clobber->pattern)); 690 printf (";\n"); 691 } 692 693 printf (" break;\n\n"); 694 } 695 696 printf (" default:\n"); 697 printf (" abort ();\n"); 698 printf (" }\n"); 699 printf ("}\n"); 700} 701 702/* Write a function, `added_clobbers_hard_reg_p' this is given an insn_code 703 number that needs clobbers and returns 1 if they include a clobber of a 704 hard reg and 0 if they just clobber SCRATCH. */ 705 706static void 707output_added_clobbers_hard_reg_p () 708{ 709 struct clobber_pat *clobber; 710 struct clobber_ent *ent; 711 int clobber_p; 712 713 printf ("\n\nint\nadded_clobbers_hard_reg_p (insn_code_number)\n"); 714 printf (" int insn_code_number;\n"); 715 printf ("{\n"); 716 printf (" switch (insn_code_number)\n"); 717 printf (" {\n"); 718 719 for (clobber_p = 0; clobber_p <= 1; clobber_p++) 720 { 721 for (clobber = clobber_list; clobber; clobber = clobber->next) 722 if (clobber->has_hard_reg == clobber_p) 723 for (ent = clobber->insns; ent; ent = ent->next) 724 printf (" case %d:\n", ent->code_number); 725 726 printf (" return %d;\n\n", clobber_p); 727 } 728 729 printf (" default:\n"); 730 printf (" abort ();\n"); 731 printf (" }\n"); 732 printf ("}\n"); 733} 734 735/* Generate code to invoke find_free_register () as needed for the 736 scratch registers used by the peephole2 pattern in SPLIT. */ 737 738static void 739output_peephole2_scratches (split) 740 rtx split; 741{ 742 int i; 743 int insn_nr = 0; 744 745 printf (" HARD_REG_SET _regs_allocated;\n"); 746 printf (" CLEAR_HARD_REG_SET (_regs_allocated);\n"); 747 748 for (i = 0; i < XVECLEN (split, 0); i++) 749 { 750 rtx elt = XVECEXP (split, 0, i); 751 if (GET_CODE (elt) == MATCH_SCRATCH) 752 { 753 int last_insn_nr = insn_nr; 754 int cur_insn_nr = insn_nr; 755 int j; 756 for (j = i + 1; j < XVECLEN (split, 0); j++) 757 if (GET_CODE (XVECEXP (split, 0, j)) == MATCH_DUP) 758 { 759 if (XINT (XVECEXP (split, 0, j), 0) == XINT (elt, 0)) 760 last_insn_nr = cur_insn_nr; 761 } 762 else if (GET_CODE (XVECEXP (split, 0, j)) != MATCH_SCRATCH) 763 cur_insn_nr++; 764 765 printf (" if ((operands[%d] = peep2_find_free_register (%d, %d, \"%s\", %smode, &_regs_allocated)) == NULL_RTX)\n\ 766 return NULL;\n", 767 XINT (elt, 0), 768 insn_nr, last_insn_nr, 769 XSTR (elt, 1), 770 GET_MODE_NAME (GET_MODE (elt))); 771 772 } 773 else if (GET_CODE (elt) != MATCH_DUP) 774 insn_nr++; 775 } 776} 777 778extern int main PARAMS ((int, char **)); 779 780int 781main (argc, argv) 782 int argc; 783 char **argv; 784{ 785 rtx desc; 786 787 progname = "genemit"; 788 789 if (argc <= 1) 790 fatal ("no input file name"); 791 792 if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE) 793 return (FATAL_EXIT_CODE); 794 795 /* Assign sequential codes to all entries in the machine description 796 in parallel with the tables in insn-output.c. */ 797 798 insn_code_number = 0; 799 insn_index_number = 0; 800 801 printf ("/* Generated automatically by the program `genemit'\n\ 802from the machine description file `md'. */\n\n"); 803 804 printf ("#include \"config.h\"\n"); 805 printf ("#include \"system.h\"\n"); 806 printf ("#include \"rtl.h\"\n"); 807 printf ("#include \"tm_p.h\"\n"); 808 printf ("#include \"function.h\"\n"); 809 printf ("#include \"expr.h\"\n"); 810 printf ("#include \"optabs.h\"\n"); 811 printf ("#include \"real.h\"\n"); 812 printf ("#include \"flags.h\"\n"); 813 printf ("#include \"output.h\"\n"); 814 printf ("#include \"insn-config.h\"\n"); 815 printf ("#include \"hard-reg-set.h\"\n"); 816 printf ("#include \"recog.h\"\n"); 817 printf ("#include \"resource.h\"\n"); 818 printf ("#include \"reload.h\"\n"); 819 printf ("#include \"toplev.h\"\n"); 820 printf ("#include \"ggc.h\"\n\n"); 821 printf ("#define FAIL return (end_sequence (), _val)\n"); 822 printf ("#define DONE return (_val = gen_sequence (), end_sequence (), _val)\n"); 823 824 /* Read the machine description. */ 825 826 while (1) 827 { 828 int line_no; 829 830 desc = read_md_rtx (&line_no, &insn_code_number); 831 if (desc == NULL) 832 break; 833 834 switch (GET_CODE (desc)) 835 { 836 case DEFINE_INSN: 837 gen_insn (desc); 838 break; 839 840 case DEFINE_EXPAND: 841 gen_expand (desc); 842 break; 843 844 case DEFINE_SPLIT: 845 gen_split (desc); 846 break; 847 848 case DEFINE_PEEPHOLE2: 849 gen_split (desc); 850 break; 851 852 default: 853 break; 854 } 855 ++insn_index_number; 856 } 857 858 /* Write out the routines to add CLOBBERs to a pattern and say whether they 859 clobber a hard reg. */ 860 output_add_clobbers (); 861 output_added_clobbers_hard_reg_p (); 862 863 fflush (stdout); 864 return (ferror (stdout) != 0 ? FATAL_EXIT_CODE : SUCCESS_EXIT_CODE); 865} 866 867/* Define this so we can link with print-rtl.o to get debug_rtx function. */ 868const char * 869get_insn_name (code) 870 int code ATTRIBUTE_UNUSED; 871{ 872 return NULL; 873} 874