tcg/optimize.c

   1 /*
   2  * Optimizations for Tiny Code Generator for QEMU
   3  *
   4  * Copyright (c) 2010 Samsung Electronics.
   5  * Contributed by Kirill Batuzov <batuzovk@ispras.ru>
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25
  26 #include "config.h"
  27
  28 #include <stdlib.h>
  29 #include <stdio.h>
  30
  31 #include "qemu-common.h"
  32 #include "tcg-op.h"
  33
  34 #define CASE_OP_32_64(x)                        \
  35         glue(glue(case INDEX_op_, x), _i32):    \
  36         glue(glue(case INDEX_op_, x), _i64)
  37
  38 typedef enum {
  39     TCG_TEMP_UNDEF = 0,
  40     TCG_TEMP_CONST,
  41     TCG_TEMP_COPY,
  42 } tcg_temp_state;
  43
  44 struct tcg_temp_info {
  45     tcg_temp_state state;
  46     uint16_t prev_copy;
  47     uint16_t next_copy;
  48     tcg_target_ulong val;
  49     tcg_target_ulong mask;
  50 };
  51
  52 static struct tcg_temp_info temps[TCG_MAX_TEMPS];
  53
  54 /* Reset TEMP's state to TCG_TEMP_UNDEF.  If TEMP only had one copy, remove
  55    the copy flag from the left temp.  */
  56 static void reset_temp(TCGArg temp)
  57 {
  58     if (temps[temp].state == TCG_TEMP_COPY) {
  59         if (temps[temp].prev_copy == temps[temp].next_copy) {
  60             temps[temps[temp].next_copy].state = TCG_TEMP_UNDEF;
  61         } else {
  62             temps[temps[temp].next_copy].prev_copy = temps[temp].prev_copy;
  63             temps[temps[temp].prev_copy].next_copy = temps[temp].next_copy;
  64         }
  65     }
  66     temps[temp].state = TCG_TEMP_UNDEF;
  67     temps[temp].mask = -1;
  68 }
  69
  70 /* Reset all temporaries, given that there are NB_TEMPS of them.  */
  71 static void reset_all_temps(int nb_temps)
  72 {
  73     int i;
  74     for (i = 0; i < nb_temps; i++) {
  75         temps[i].state = TCG_TEMP_UNDEF;
  76         temps[i].mask = -1;
  77     }
  78 }
  79
  80 static int op_bits(TCGOpcode op)
  81 {
  82     const TCGOpDef *def = &tcg_op_defs[op];
  83     return def->flags & TCG_OPF_64BIT ? 64 : 32;
  84 }
  85
  86 static TCGOpcode op_to_movi(TCGOpcode op)
  87 {
  88     switch (op_bits(op)) {
  89     case 32:
  90         return INDEX_op_movi_i32;
  91     case 64:
  92         return INDEX_op_movi_i64;
  93     default:
  94         fprintf(stderr, "op_to_movi: unexpected return value of "
  95                 "function op_bits.\n");
  96         tcg_abort();
  97     }
  98 }
  99
 100 static TCGArg find_better_copy(TCGContext *s, TCGArg temp)
 101 {
 102     TCGArg i;
 103
 104     /* If this is already a global, we can't do better. */
 105     if (temp < s->nb_globals) {
 106         return temp;
 107     }
 108
 109     /* Search for a global first. */
 110     for (i = temps[temp].next_copy ; i != temp ; i = temps[i].next_copy) {
 111         if (i < s->nb_globals) {
 112             return i;
 113         }
 114     }
 115
 116     /* If it is a temp, search for a temp local. */
 117     if (!s->temps[temp].temp_local) {
 118         for (i = temps[temp].next_copy ; i != temp ; i = temps[i].next_copy) {
 119             if (s->temps[i].temp_local) {
 120                 return i;
 121             }
 122         }
 123     }
 124
 125     /* Failure to find a better representation, return the same temp. */
 126     return temp;
 127 }
 128
 129 static bool temps_are_copies(TCGArg arg1, TCGArg arg2)
 130 {
 131     TCGArg i;
 132
 133     if (arg1 == arg2) {
 134         return true;
 135     }
 136
 137     if (temps[arg1].state != TCG_TEMP_COPY
 138         || temps[arg2].state != TCG_TEMP_COPY) {
 139         return false;
 140     }
 141
 142     for (i = temps[arg1].next_copy ; i != arg1 ; i = temps[i].next_copy) {
 143         if (i == arg2) {
 144             return true;
 145         }
 146     }
 147
 148     return false;
 149 }
 150
 151 static void tcg_opt_gen_mov(TCGContext *s, TCGArg *gen_args,
 152                             TCGArg dst, TCGArg src)
 153 {
 154     reset_temp(dst);
 155     temps[dst].mask = temps[src].mask;
 156     assert(temps[src].state != TCG_TEMP_CONST);
 157
 158     if (s->temps[src].type == s->temps[dst].type) {
 159         if (temps[src].state != TCG_TEMP_COPY) {
 160             temps[src].state = TCG_TEMP_COPY;
 161             temps[src].next_copy = src;
 162             temps[src].prev_copy = src;
 163         }
 164         temps[dst].state = TCG_TEMP_COPY;
 165         temps[dst].next_copy = temps[src].next_copy;
 166         temps[dst].prev_copy = src;
 167         temps[temps[dst].next_copy].prev_copy = dst;
 168         temps[src].next_copy = dst;
 169     }
 170
 171     gen_args[0] = dst;
 172     gen_args[1] = src;
 173 }
 174
 175 static void tcg_opt_gen_movi(TCGArg *gen_args, TCGArg dst, TCGArg val)
 176 {
 177     reset_temp(dst);
 178     temps[dst].state = TCG_TEMP_CONST;
 179     temps[dst].val = val;
 180     temps[dst].mask = val;
 181     gen_args[0] = dst;
 182     gen_args[1] = val;
 183 }
 184
 185 static TCGOpcode op_to_mov(TCGOpcode op)
 186 {
 187     switch (op_bits(op)) {
 188     case 32:
 189         return INDEX_op_mov_i32;
 190     case 64:
 191         return INDEX_op_mov_i64;
 192     default:
 193         fprintf(stderr, "op_to_mov: unexpected return value of "
 194                 "function op_bits.\n");
 195         tcg_abort();
 196     }
 197 }
 198
 199 static TCGArg do_constant_folding_2(TCGOpcode op, TCGArg x, TCGArg y)
 200 {
 201     uint64_t l64, h64;
 202
 203     switch (op) {
 204     CASE_OP_32_64(add):
 205         return x + y;
 206
 207     CASE_OP_32_64(sub):
 208         return x - y;
 209
 210     CASE_OP_32_64(mul):
 211         return x * y;
 212
 213     CASE_OP_32_64(and):
 214         return x & y;
 215
 216     CASE_OP_32_64(or):
 217         return x | y;
 218
 219     CASE_OP_32_64(xor):
 220         return x ^ y;
 221
 222     case INDEX_op_shl_i32:
 223         return (uint32_t)x << (y & 31);
 224
 225     case INDEX_op_shl_i64:
 226         return (uint64_t)x << (y & 63);
 227
 228     case INDEX_op_shr_i32:
 229         return (uint32_t)x >> (y & 31);
 230
 231     case INDEX_op_trunc_shr_i32:
 232     case INDEX_op_shr_i64:
 233         return (uint64_t)x >> (y & 63);
 234
 235     case INDEX_op_sar_i32:
 236         return (int32_t)x >> (y & 31);
 237
 238     case INDEX_op_sar_i64:
 239         return (int64_t)x >> (y & 63);
 240
 241     case INDEX_op_rotr_i32:
 242         return ror32(x, y & 31);
 243
 244     case INDEX_op_rotr_i64:
 245         return ror64(x, y & 63);
 246
 247     case INDEX_op_rotl_i32:
 248         return rol32(x, y & 31);
 249
 250     case INDEX_op_rotl_i64:
 251         return rol64(x, y & 63);
 252
 253     CASE_OP_32_64(not):
 254         return ~x;
 255
 256     CASE_OP_32_64(neg):
 257         return -x;
 258
 259     CASE_OP_32_64(andc):
 260         return x & ~y;
 261
 262     CASE_OP_32_64(orc):
 263         return x | ~y;
 264
 265     CASE_OP_32_64(eqv):
 266         return ~(x ^ y);
 267
 268     CASE_OP_32_64(nand):
 269         return ~(x & y);
 270
 271     CASE_OP_32_64(nor):
 272         return ~(x | y);
 273
 274     CASE_OP_32_64(ext8s):
 275         return (int8_t)x;
 276
 277     CASE_OP_32_64(ext16s):
 278         return (int16_t)x;
 279
 280     CASE_OP_32_64(ext8u):
 281         return (uint8_t)x;
 282
 283     CASE_OP_32_64(ext16u):
 284         return (uint16_t)x;
 285
 286     case INDEX_op_ext32s_i64:
 287         return (int32_t)x;
 288
 289     case INDEX_op_ext32u_i64:
 290         return (uint32_t)x;
 291
 292     case INDEX_op_muluh_i32:
 293         return ((uint64_t)(uint32_t)x * (uint32_t)y) >> 32;
 294     case INDEX_op_mulsh_i32:
 295         return ((int64_t)(int32_t)x * (int32_t)y) >> 32;
 296
 297     case INDEX_op_muluh_i64:
 298         mulu64(&l64, &h64, x, y);
 299         return h64;
 300     case INDEX_op_mulsh_i64:
 301         muls64(&l64, &h64, x, y);
 302         return h64;
 303
 304     case INDEX_op_div_i32:
 305         /* Avoid crashing on divide by zero, otherwise undefined.  */
 306         return (int32_t)x / ((int32_t)y ? : 1);
 307     case INDEX_op_divu_i32:
 308         return (uint32_t)x / ((uint32_t)y ? : 1);
 309     case INDEX_op_div_i64:
 310         return (int64_t)x / ((int64_t)y ? : 1);
 311     case INDEX_op_divu_i64:
 312         return (uint64_t)x / ((uint64_t)y ? : 1);
 313
 314     case INDEX_op_rem_i32:
 315         return (int32_t)x % ((int32_t)y ? : 1);
 316     case INDEX_op_remu_i32:
 317         return (uint32_t)x % ((uint32_t)y ? : 1);
 318     case INDEX_op_rem_i64:
 319         return (int64_t)x % ((int64_t)y ? : 1);
 320     case INDEX_op_remu_i64:
 321         return (uint64_t)x % ((uint64_t)y ? : 1);
 322
 323     default:
 324         fprintf(stderr,
 325                 "Unrecognized operation %d in do_constant_folding.\n", op);
 326         tcg_abort();
 327     }
 328 }
 329
 330 static TCGArg do_constant_folding(TCGOpcode op, TCGArg x, TCGArg y)
 331 {
 332     TCGArg res = do_constant_folding_2(op, x, y);
 333     if (op_bits(op) == 32) {
 334         res &= 0xffffffff;
 335     }
 336     return res;
 337 }
 338
 339 static bool do_constant_folding_cond_32(uint32_t x, uint32_t y, TCGCond c)
 340 {
 341     switch (c) {
 342     case TCG_COND_EQ:
 343         return x == y;
 344     case TCG_COND_NE:
 345         return x != y;
 346     case TCG_COND_LT:
 347         return (int32_t)x < (int32_t)y;
 348     case TCG_COND_GE:
 349         return (int32_t)x >= (int32_t)y;
 350     case TCG_COND_LE:
 351         return (int32_t)x <= (int32_t)y;
 352     case TCG_COND_GT:
 353         return (int32_t)x > (int32_t)y;
 354     case TCG_COND_LTU:
 355         return x < y;
 356     case TCG_COND_GEU:
 357         return x >= y;
 358     case TCG_COND_LEU:
 359         return x <= y;
 360     case TCG_COND_GTU:
 361         return x > y;
 362     default:
 363         tcg_abort();
 364     }
 365 }
 366
 367 static bool do_constant_folding_cond_64(uint64_t x, uint64_t y, TCGCond c)
 368 {
 369     switch (c) {
 370     case TCG_COND_EQ:
 371         return x == y;
 372     case TCG_COND_NE:
 373         return x != y;
 374     case TCG_COND_LT:
 375         return (int64_t)x < (int64_t)y;
 376     case TCG_COND_GE:
 377         return (int64_t)x >= (int64_t)y;
 378     case TCG_COND_LE:
 379         return (int64_t)x <= (int64_t)y;
 380     case TCG_COND_GT:
 381         return (int64_t)x > (int64_t)y;
 382     case TCG_COND_LTU:
 383         return x < y;
 384     case TCG_COND_GEU:
 385         return x >= y;
 386     case TCG_COND_LEU:
 387         return x <= y;
 388     case TCG_COND_GTU:
 389         return x > y;
 390     default:
 391         tcg_abort();
 392     }
 393 }
 394
 395 static bool do_constant_folding_cond_eq(TCGCond c)
 396 {
 397     switch (c) {
 398     case TCG_COND_GT:
 399     case TCG_COND_LTU:
 400     case TCG_COND_LT:
 401     case TCG_COND_GTU:
 402     case TCG_COND_NE:
 403         return 0;
 404     case TCG_COND_GE:
 405     case TCG_COND_GEU:
 406     case TCG_COND_LE:
 407     case TCG_COND_LEU:
 408     case TCG_COND_EQ:
 409         return 1;
 410     default:
 411         tcg_abort();
 412     }
 413 }
 414
 415 /* Return 2 if the condition can't be simplified, and the result
 416    of the condition (0 or 1) if it can */
 417 static TCGArg do_constant_folding_cond(TCGOpcode op, TCGArg x,
 418                                        TCGArg y, TCGCond c)
 419 {
 420     if (temps[x].state == TCG_TEMP_CONST && temps[y].state == TCG_TEMP_CONST) {
 421         switch (op_bits(op)) {
 422         case 32:
 423             return do_constant_folding_cond_32(temps[x].val, temps[y].val, c);
 424         case 64:
 425             return do_constant_folding_cond_64(temps[x].val, temps[y].val, c);
 426         default:
 427             tcg_abort();
 428         }
 429     } else if (temps_are_copies(x, y)) {
 430         return do_constant_folding_cond_eq(c);
 431     } else if (temps[y].state == TCG_TEMP_CONST && temps[y].val == 0) {
 432         switch (c) {
 433         case TCG_COND_LTU:
 434             return 0;
 435         case TCG_COND_GEU:
 436             return 1;
 437         default:
 438             return 2;
 439         }
 440     } else {
 441         return 2;
 442     }
 443 }
 444
 445 /* Return 2 if the condition can't be simplified, and the result
 446    of the condition (0 or 1) if it can */
 447 static TCGArg do_constant_folding_cond2(TCGArg *p1, TCGArg *p2, TCGCond c)
 448 {
 449     TCGArg al = p1[0], ah = p1[1];
 450     TCGArg bl = p2[0], bh = p2[1];
 451
 452     if (temps[bl].state == TCG_TEMP_CONST
 453         && temps[bh].state == TCG_TEMP_CONST) {
 454         uint64_t b = ((uint64_t)temps[bh].val << 32) | (uint32_t)temps[bl].val;
 455
 456         if (temps[al].state == TCG_TEMP_CONST
 457             && temps[ah].state == TCG_TEMP_CONST) {
 458             uint64_t a;
 459             a = ((uint64_t)temps[ah].val << 32) | (uint32_t)temps[al].val;
 460             return do_constant_folding_cond_64(a, b, c);
 461         }
 462         if (b == 0) {
 463             switch (c) {
 464             case TCG_COND_LTU:
 465                 return 0;
 466             case TCG_COND_GEU:
 467                 return 1;
 468             default:
 469                 break;
 470             }
 471         }
 472     }
 473     if (temps_are_copies(al, bl) && temps_are_copies(ah, bh)) {
 474         return do_constant_folding_cond_eq(c);
 475     }
 476     return 2;
 477 }
 478
 479 static bool swap_commutative(TCGArg dest, TCGArg *p1, TCGArg *p2)
 480 {
 481     TCGArg a1 = *p1, a2 = *p2;
 482     int sum = 0;
 483     sum += temps[a1].state == TCG_TEMP_CONST;
 484     sum -= temps[a2].state == TCG_TEMP_CONST;
 485
 486     /* Prefer the constant in second argument, and then the form
 487        op a, a, b, which is better handled on non-RISC hosts. */
 488     if (sum > 0 || (sum == 0 && dest == a2)) {
 489         *p1 = a2;
 490         *p2 = a1;
 491         return true;
 492     }
 493     return false;
 494 }
 495
 496 static bool swap_commutative2(TCGArg *p1, TCGArg *p2)
 497 {
 498     int sum = 0;
 499     sum += temps[p1[0]].state == TCG_TEMP_CONST;
 500     sum += temps[p1[1]].state == TCG_TEMP_CONST;
 501     sum -= temps[p2[0]].state == TCG_TEMP_CONST;
 502     sum -= temps[p2[1]].state == TCG_TEMP_CONST;
 503     if (sum > 0) {
 504         TCGArg t;
 505         t = p1[0], p1[0] = p2[0], p2[0] = t;
 506         t = p1[1], p1[1] = p2[1], p2[1] = t;
 507         return true;
 508     }
 509     return false;
 510 }
 511
 512 /* Propagate constants and copies, fold constant expressions. */
 513 static TCGArg *tcg_constant_folding(TCGContext *s, uint16_t *tcg_opc_ptr,
 514                                     TCGArg *args, TCGOpDef *tcg_op_defs)
 515 {
 516     int i, nb_ops, op_index, nb_temps, nb_globals, nb_call_args;
 517     tcg_target_ulong mask, affected;
 518     TCGOpcode op;
 519     const TCGOpDef *def;
 520     TCGArg *gen_args;
 521     TCGArg tmp;
 522
 523     /* Array VALS has an element for each temp.
 524        If this temp holds a constant then its value is kept in VALS' element.
 525        If this temp is a copy of other ones then the other copies are
 526        available through the doubly linked circular list. */
 527
 528     nb_temps = s->nb_temps;
 529     nb_globals = s->nb_globals;
 530     reset_all_temps(nb_temps);
 531
 532     nb_ops = tcg_opc_ptr - s->gen_opc_buf;
 533     gen_args = args;
 534     for (op_index = 0; op_index < nb_ops; op_index++) {
 535         op = s->gen_opc_buf[op_index];
 536         def = &tcg_op_defs[op];
 537         /* Do copy propagation */
 538         if (op == INDEX_op_call) {
 539             int nb_oargs = args[0] >> 16;
 540             int nb_iargs = args[0] & 0xffff;
 541             for (i = nb_oargs + 1; i < nb_oargs + nb_iargs + 1; i++) {
 542                 if (temps[args[i]].state == TCG_TEMP_COPY) {
 543                     args[i] = find_better_copy(s, args[i]);
 544                 }
 545             }
 546         } else {
 547             for (i = def->nb_oargs; i < def->nb_oargs + def->nb_iargs; i++) {
 548                 if (temps[args[i]].state == TCG_TEMP_COPY) {
 549                     args[i] = find_better_copy(s, args[i]);
 550                 }
 551             }
 552         }
 553
 554         /* For commutative operations make constant second argument */
 555         switch (op) {
 556         CASE_OP_32_64(add):
 557         CASE_OP_32_64(mul):
 558         CASE_OP_32_64(and):
 559         CASE_OP_32_64(or):
 560         CASE_OP_32_64(xor):
 561         CASE_OP_32_64(eqv):
 562         CASE_OP_32_64(nand):
 563         CASE_OP_32_64(nor):
 564         CASE_OP_32_64(muluh):
 565         CASE_OP_32_64(mulsh):
 566             swap_commutative(args[0], &args[1], &args[2]);
 567             break;
 568         CASE_OP_32_64(brcond):
 569             if (swap_commutative(-1, &args[0], &args[1])) {
 570                 args[2] = tcg_swap_cond(args[2]);
 571             }
 572             break;
 573         CASE_OP_32_64(setcond):
 574             if (swap_commutative(args[0], &args[1], &args[2])) {
 575                 args[3] = tcg_swap_cond(args[3]);
 576             }
 577             break;
 578         CASE_OP_32_64(movcond):
 579             if (swap_commutative(-1, &args[1], &args[2])) {
 580                 args[5] = tcg_swap_cond(args[5]);
 581             }
 582             /* For movcond, we canonicalize the "false" input reg to match
 583                the destination reg so that the tcg backend can implement
 584                a "move if true" operation.  */
 585             if (swap_commutative(args[0], &args[4], &args[3])) {
 586                 args[5] = tcg_invert_cond(args[5]);
 587             }
 588             break;
 589         CASE_OP_32_64(add2):
 590             swap_commutative(args[0], &args[2], &args[4]);
 591             swap_commutative(args[1], &args[3], &args[5]);
 592             break;
 593         CASE_OP_32_64(mulu2):
 594         CASE_OP_32_64(muls2):
 595             swap_commutative(args[0], &args[2], &args[3]);
 596             break;
 597         case INDEX_op_brcond2_i32:
 598             if (swap_commutative2(&args[0], &args[2])) {
 599                 args[4] = tcg_swap_cond(args[4]);
 600             }
 601             break;
 602         case INDEX_op_setcond2_i32:
 603             if (swap_commutative2(&args[1], &args[3])) {
 604                 args[5] = tcg_swap_cond(args[5]);
 605             }
 606             break;
 607         default:
 608             break;
 609         }
 610
 611         /* Simplify expressions for "shift/rot r, 0, a => movi r, 0",
 612            and "sub r, 0, a => neg r, a" case.  */
 613         switch (op) {
 614         CASE_OP_32_64(shl):
 615         CASE_OP_32_64(shr):
 616         CASE_OP_32_64(sar):
 617         CASE_OP_32_64(rotl):
 618         CASE_OP_32_64(rotr):
 619             if (temps[args[1]].state == TCG_TEMP_CONST
 620                 && temps[args[1]].val == 0) {
 621                 s->gen_opc_buf[op_index] = op_to_movi(op);
 622                 tcg_opt_gen_movi(gen_args, args[0], 0);
 623                 args += 3;
 624                 gen_args += 2;
 625                 continue;
 626             }
 627             break;
 628         CASE_OP_32_64(sub):
 629             {
 630                 TCGOpcode neg_op;
 631                 bool have_neg;
 632
 633                 if (temps[args[2]].state == TCG_TEMP_CONST) {
 634                     /* Proceed with possible constant folding. */
 635                     break;
 636                 }
 637                 if (op == INDEX_op_sub_i32) {
 638                     neg_op = INDEX_op_neg_i32;
 639                     have_neg = TCG_TARGET_HAS_neg_i32;
 640                 } else {
 641                     neg_op = INDEX_op_neg_i64;
 642                     have_neg = TCG_TARGET_HAS_neg_i64;
 643                 }
 644                 if (!have_neg) {
 645                     break;
 646                 }
 647                 if (temps[args[1]].state == TCG_TEMP_CONST
 648                     && temps[args[1]].val == 0) {
 649                     s->gen_opc_buf[op_index] = neg_op;
 650                     reset_temp(args[0]);
 651                     gen_args[0] = args[0];
 652                     gen_args[1] = args[2];
 653                     args += 3;
 654                     gen_args += 2;
 655                     continue;
 656                 }
 657             }
 658             break;
 659         CASE_OP_32_64(xor):
 660         CASE_OP_32_64(nand):
 661             if (temps[args[1]].state != TCG_TEMP_CONST
 662                 && temps[args[2]].state == TCG_TEMP_CONST
 663                 && temps[args[2]].val == -1) {
 664                 i = 1;
 665                 goto try_not;
 666             }
 667             break;
 668         CASE_OP_32_64(nor):
 669             if (temps[args[1]].state != TCG_TEMP_CONST
 670                 && temps[args[2]].state == TCG_TEMP_CONST
 671                 && temps[args[2]].val == 0) {
 672                 i = 1;
 673                 goto try_not;
 674             }
 675             break;
 676         CASE_OP_32_64(andc):
 677             if (temps[args[2]].state != TCG_TEMP_CONST
 678                 && temps[args[1]].state == TCG_TEMP_CONST
 679                 && temps[args[1]].val == -1) {
 680                 i = 2;
 681                 goto try_not;
 682             }
 683             break;
 684         CASE_OP_32_64(orc):
 685         CASE_OP_32_64(eqv):
 686             if (temps[args[2]].state != TCG_TEMP_CONST
 687                 && temps[args[1]].state == TCG_TEMP_CONST
 688                 && temps[args[1]].val == 0) {
 689                 i = 2;
 690                 goto try_not;
 691             }
 692             break;
 693         try_not:
 694             {
 695                 TCGOpcode not_op;
 696                 bool have_not;
 697
 698                 if (def->flags & TCG_OPF_64BIT) {
 699                     not_op = INDEX_op_not_i64;
 700                     have_not = TCG_TARGET_HAS_not_i64;
 701                 } else {
 702                     not_op = INDEX_op_not_i32;
 703                     have_not = TCG_TARGET_HAS_not_i32;
 704                 }
 705                 if (!have_not) {
 706                     break;
 707                 }
 708                 s->gen_opc_buf[op_index] = not_op;
 709                 reset_temp(args[0]);
 710                 gen_args[0] = args[0];
 711                 gen_args[1] = args[i];
 712                 args += 3;
 713                 gen_args += 2;
 714                 continue;
 715             }
 716         default:
 717             break;
 718         }
 719
 720         /* Simplify expression for "op r, a, const => mov r, a" cases */
 721         switch (op) {
 722         CASE_OP_32_64(add):
 723         CASE_OP_32_64(sub):
 724         CASE_OP_32_64(shl):
 725         CASE_OP_32_64(shr):
 726         CASE_OP_32_64(sar):
 727         CASE_OP_32_64(rotl):
 728         CASE_OP_32_64(rotr):
 729         CASE_OP_32_64(or):
 730         CASE_OP_32_64(xor):
 731         CASE_OP_32_64(andc):
 732             if (temps[args[1]].state != TCG_TEMP_CONST
 733                 && temps[args[2]].state == TCG_TEMP_CONST
 734                 && temps[args[2]].val == 0) {
 735                 goto do_mov3;
 736             }
 737             break;
 738         CASE_OP_32_64(and):
 739         CASE_OP_32_64(orc):
 740         CASE_OP_32_64(eqv):
 741             if (temps[args[1]].state != TCG_TEMP_CONST
 742                 && temps[args[2]].state == TCG_TEMP_CONST
 743                 && temps[args[2]].val == -1) {
 744                 goto do_mov3;
 745             }
 746             break;
 747         do_mov3:
 748             if (temps_are_copies(args[0], args[1])) {
 749                 s->gen_opc_buf[op_index] = INDEX_op_nop;
 750             } else {
 751                 s->gen_opc_buf[op_index] = op_to_mov(op);
 752                 tcg_opt_gen_mov(s, gen_args, args[0], args[1]);
 753                 gen_args += 2;
 754             }
 755             args += 3;
 756             continue;
 757         default:
 758             break;
 759         }
 760
 761         /* Simplify using known-zero bits. Currently only ops with a single
 762            output argument is supported. */
 763         mask = -1;
 764         affected = -1;
 765         switch (op) {
 766         CASE_OP_32_64(ext8s):
 767             if ((temps[args[1]].mask & 0x80) != 0) {
 768                 break;
 769             }
 770         CASE_OP_32_64(ext8u):
 771             mask = 0xff;
 772             goto and_const;
 773         CASE_OP_32_64(ext16s):
 774             if ((temps[args[1]].mask & 0x8000) != 0) {
 775                 break;
 776             }
 777         CASE_OP_32_64(ext16u):
 778             mask = 0xffff;
 779             goto and_const;
 780         case INDEX_op_ext32s_i64:
 781             if ((temps[args[1]].mask & 0x80000000) != 0) {
 782                 break;
 783             }
 784         case INDEX_op_ext32u_i64:
 785             mask = 0xffffffffU;
 786             goto and_const;
 787
 788         CASE_OP_32_64(and):
 789             mask = temps[args[2]].mask;
 790             if (temps[args[2]].state == TCG_TEMP_CONST) {
 791         and_const:
 792                 affected = temps[args[1]].mask & ~mask;
 793             }
 794             mask = temps[args[1]].mask & mask;
 795             break;
 796
 797         CASE_OP_32_64(andc):
 798             /* Known-zeros does not imply known-ones.  Therefore unless
 799                args[2] is constant, we can't infer anything from it.  */
 800             if (temps[args[2]].state == TCG_TEMP_CONST) {
 801                 mask = ~temps[args[2]].mask;
 802                 goto and_const;
 803             }
 804             /* But we certainly know nothing outside args[1] may be set. */
 805             mask = temps[args[1]].mask;
 806             break;
 807
 808         case INDEX_op_sar_i32:
 809             if (temps[args[2]].state == TCG_TEMP_CONST) {
 810                 tmp = temps[args[2]].val & 31;
 811                 mask = (int32_t)temps[args[1]].mask >> tmp;
 812             }
 813             break;
 814         case INDEX_op_sar_i64:
 815             if (temps[args[2]].state == TCG_TEMP_CONST) {
 816                 tmp = temps[args[2]].val & 63;
 817                 mask = (int64_t)temps[args[1]].mask >> tmp;
 818             }
 819             break;
 820
 821         case INDEX_op_shr_i32:
 822             if (temps[args[2]].state == TCG_TEMP_CONST) {
 823                 tmp = temps[args[2]].val & 31;
 824                 mask = (uint32_t)temps[args[1]].mask >> tmp;
 825             }
 826             break;
 827         case INDEX_op_shr_i64:
 828             if (temps[args[2]].state == TCG_TEMP_CONST) {
 829                 tmp = temps[args[2]].val & 63;
 830                 mask = (uint64_t)temps[args[1]].mask >> tmp;
 831             }
 832             break;
 833
 834         case INDEX_op_trunc_shr_i32:
 835             mask = (uint64_t)temps[args[1]].mask >> args[2];
 836             break;
 837
 838         CASE_OP_32_64(shl):
 839             if (temps[args[2]].state == TCG_TEMP_CONST) {
 840                 tmp = temps[args[2]].val & (TCG_TARGET_REG_BITS - 1);
 841                 mask = temps[args[1]].mask << tmp;
 842             }
 843             break;
 844
 845         CASE_OP_32_64(neg):
 846             /* Set to 1 all bits to the left of the rightmost.  */
 847             mask = -(temps[args[1]].mask & -temps[args[1]].mask);
 848             break;
 849
 850         CASE_OP_32_64(deposit):
 851             mask = deposit64(temps[args[1]].mask, args[3], args[4],
 852                              temps[args[2]].mask);
 853             break;
 854
 855         CASE_OP_32_64(or):
 856         CASE_OP_32_64(xor):
 857             mask = temps[args[1]].mask | temps[args[2]].mask;
 858             break;
 859
 860         CASE_OP_32_64(setcond):
 861             mask = 1;
 862             break;
 863
 864         CASE_OP_32_64(movcond):
 865             mask = temps[args[3]].mask | temps[args[4]].mask;
 866             break;
 867
 868         CASE_OP_32_64(ld8u):
 869         case INDEX_op_qemu_ld8u:
 870             mask = 0xff;
 871             break;
 872         CASE_OP_32_64(ld16u):
 873         case INDEX_op_qemu_ld16u:
 874             mask = 0xffff;
 875             break;
 876         case INDEX_op_ld32u_i64:
 877 #if TCG_TARGET_REG_BITS == 64
 878         case INDEX_op_qemu_ld32u:
 879 #endif
 880             mask = 0xffffffffu;
 881             break;
 882
 883         CASE_OP_32_64(qemu_ld):
 884             {
 885                 TCGMemOp mop = args[def->nb_oargs + def->nb_iargs];
 886                 if (!(mop & MO_SIGN)) {
 887                     mask = (2ULL << ((8 << (mop & MO_SIZE)) - 1)) - 1;
 888                 }
 889             }
 890             break;
 891
 892         default:
 893             break;
 894         }
 895
 896         /* 32-bit ops (non 64-bit ops and non load/store ops) generate 32-bit
 897            results */
 898         if (!(def->flags & (TCG_OPF_CALL_CLOBBER | TCG_OPF_64BIT))) {
 899             mask &= 0xffffffffu;
 900         }
 901
 902         if (mask == 0) {
 903             assert(def->nb_oargs == 1);
 904             s->gen_opc_buf[op_index] = op_to_movi(op);
 905             tcg_opt_gen_movi(gen_args, args[0], 0);
 906             args += def->nb_oargs + def->nb_iargs + def->nb_cargs;
 907             gen_args += 2;
 908             continue;
 909         }
 910         if (affected == 0) {
 911             assert(def->nb_oargs == 1);
 912             if (temps_are_copies(args[0], args[1])) {
 913                 s->gen_opc_buf[op_index] = INDEX_op_nop;
 914             } else if (temps[args[1]].state != TCG_TEMP_CONST) {
 915                 s->gen_opc_buf[op_index] = op_to_mov(op);
 916                 tcg_opt_gen_mov(s, gen_args, args[0], args[1]);
 917                 gen_args += 2;
 918             } else {
 919                 s->gen_opc_buf[op_index] = op_to_movi(op);
 920                 tcg_opt_gen_movi(gen_args, args[0], temps[args[1]].val);
 921                 gen_args += 2;
 922             }
 923             args += def->nb_iargs + 1;
 924             continue;
 925         }
 926
 927         /* Simplify expression for "op r, a, 0 => movi r, 0" cases */
 928         switch (op) {
 929         CASE_OP_32_64(and):
 930         CASE_OP_32_64(mul):
 931         CASE_OP_32_64(muluh):
 932         CASE_OP_32_64(mulsh):
 933             if ((temps[args[2]].state == TCG_TEMP_CONST
 934                 && temps[args[2]].val == 0)) {
 935                 s->gen_opc_buf[op_index] = op_to_movi(op);
 936                 tcg_opt_gen_movi(gen_args, args[0], 0);
 937                 args += 3;
 938                 gen_args += 2;
 939                 continue;
 940             }
 941             break;
 942         default:
 943             break;
 944         }
 945
 946         /* Simplify expression for "op r, a, a => mov r, a" cases */
 947         switch (op) {
 948         CASE_OP_32_64(or):
 949         CASE_OP_32_64(and):
 950             if (temps_are_copies(args[1], args[2])) {
 951                 if (temps_are_copies(args[0], args[1])) {
 952                     s->gen_opc_buf[op_index] = INDEX_op_nop;
 953                 } else {
 954                     s->gen_opc_buf[op_index] = op_to_mov(op);
 955                     tcg_opt_gen_mov(s, gen_args, args[0], args[1]);
 956                     gen_args += 2;
 957                 }
 958                 args += 3;
 959                 continue;
 960             }
 961             break;
 962         default:
 963             break;
 964         }
 965
 966         /* Simplify expression for "op r, a, a => movi r, 0" cases */
 967         switch (op) {
 968         CASE_OP_32_64(andc):
 969         CASE_OP_32_64(sub):
 970         CASE_OP_32_64(xor):
 971             if (temps_are_copies(args[1], args[2])) {
 972                 s->gen_opc_buf[op_index] = op_to_movi(op);
 973                 tcg_opt_gen_movi(gen_args, args[0], 0);
 974                 gen_args += 2;
 975                 args += 3;
 976                 continue;
 977             }
 978             break;
 979         default:
 980             break;
 981         }
 982
 983         /* Propagate constants through copy operations and do constant
 984            folding.  Constants will be substituted to arguments by register
 985            allocator where needed and possible.  Also detect copies. */
 986         switch (op) {
 987         CASE_OP_32_64(mov):
 988             if (temps_are_copies(args[0], args[1])) {
 989                 args += 2;
 990                 s->gen_opc_buf[op_index] = INDEX_op_nop;
 991                 break;
 992             }
 993             if (temps[args[1]].state != TCG_TEMP_CONST) {
 994                 tcg_opt_gen_mov(s, gen_args, args[0], args[1]);
 995                 gen_args += 2;
 996                 args += 2;
 997                 break;
 998             }
 999             /* Source argument is constant.  Rewrite the operation and
1000                let movi case handle it. */
1001             op = op_to_movi(op);
1002             s->gen_opc_buf[op_index] = op;
1003             args[1] = temps[args[1]].val;
1004             /* fallthrough */
1005         CASE_OP_32_64(movi):
1006             tcg_opt_gen_movi(gen_args, args[0], args[1]);
1007             gen_args += 2;
1008             args += 2;
1009             break;
1010
1011         CASE_OP_32_64(not):
1012         CASE_OP_32_64(neg):
1013         CASE_OP_32_64(ext8s):
1014         CASE_OP_32_64(ext8u):
1015         CASE_OP_32_64(ext16s):
1016         CASE_OP_32_64(ext16u):
1017         case INDEX_op_ext32s_i64:
1018         case INDEX_op_ext32u_i64:
1019             if (temps[args[1]].state == TCG_TEMP_CONST) {
1020                 s->gen_opc_buf[op_index] = op_to_movi(op);
1021                 tmp = do_constant_folding(op, temps[args[1]].val, 0);
1022                 tcg_opt_gen_movi(gen_args, args[0], tmp);
1023                 gen_args += 2;
1024                 args += 2;
1025                 break;
1026             }
1027             goto do_default;
1028
1029         case INDEX_op_trunc_shr_i32:
1030             if (temps[args[1]].state == TCG_TEMP_CONST) {
1031                 s->gen_opc_buf[op_index] = op_to_movi(op);
1032                 tmp = do_constant_folding(op, temps[args[1]].val, args[2]);
1033                 tcg_opt_gen_movi(gen_args, args[0], tmp);
1034                 gen_args += 2;
1035                 args += 3;
1036                 break;
1037             }
1038             goto do_default;
1039
1040         CASE_OP_32_64(add):
1041         CASE_OP_32_64(sub):
1042         CASE_OP_32_64(mul):
1043         CASE_OP_32_64(or):
1044         CASE_OP_32_64(and):
1045         CASE_OP_32_64(xor):
1046         CASE_OP_32_64(shl):
1047         CASE_OP_32_64(shr):
1048         CASE_OP_32_64(sar):
1049         CASE_OP_32_64(rotl):
1050         CASE_OP_32_64(rotr):
1051         CASE_OP_32_64(andc):
1052         CASE_OP_32_64(orc):
1053         CASE_OP_32_64(eqv):
1054         CASE_OP_32_64(nand):
1055         CASE_OP_32_64(nor):
1056         CASE_OP_32_64(muluh):
1057         CASE_OP_32_64(mulsh):
1058         CASE_OP_32_64(div):
1059         CASE_OP_32_64(divu):
1060         CASE_OP_32_64(rem):
1061         CASE_OP_32_64(remu):
1062             if (temps[args[1]].state == TCG_TEMP_CONST
1063                 && temps[args[2]].state == TCG_TEMP_CONST) {
1064                 s->gen_opc_buf[op_index] = op_to_movi(op);
1065                 tmp = do_constant_folding(op, temps[args[1]].val,
1066                                           temps[args[2]].val);
1067                 tcg_opt_gen_movi(gen_args, args[0], tmp);
1068                 gen_args += 2;
1069                 args += 3;
1070                 break;
1071             }
1072             goto do_default;
1073
1074         CASE_OP_32_64(deposit):
1075             if (temps[args[1]].state == TCG_TEMP_CONST
1076                 && temps[args[2]].state == TCG_TEMP_CONST) {
1077                 s->gen_opc_buf[op_index] = op_to_movi(op);
1078                 tmp = deposit64(temps[args[1]].val, args[3], args[4],
1079                                 temps[args[2]].val);
1080                 tcg_opt_gen_movi(gen_args, args[0], tmp);
1081                 gen_args += 2;
1082                 args += 5;
1083                 break;
1084             }
1085             goto do_default;
1086
1087         CASE_OP_32_64(setcond):
1088             tmp = do_constant_folding_cond(op, args[1], args[2], args[3]);
1089             if (tmp != 2) {
1090                 s->gen_opc_buf[op_index] = op_to_movi(op);
1091                 tcg_opt_gen_movi(gen_args, args[0], tmp);
1092                 gen_args += 2;
1093                 args += 4;
1094                 break;
1095             }
1096             goto do_default;
1097
1098         CASE_OP_32_64(brcond):
1099             tmp = do_constant_folding_cond(op, args[0], args[1], args[2]);
1100             if (tmp != 2) {
1101                 if (tmp) {
1102                     reset_all_temps(nb_temps);
1103                     s->gen_opc_buf[op_index] = INDEX_op_br;
1104                     gen_args[0] = args[3];
1105                     gen_args += 1;
1106                 } else {
1107                     s->gen_opc_buf[op_index] = INDEX_op_nop;
1108                 }
1109                 args += 4;
1110                 break;
1111             }
1112             goto do_default;
1113
1114         CASE_OP_32_64(movcond):
1115             tmp = do_constant_folding_cond(op, args[1], args[2], args[5]);
1116             if (tmp != 2) {
1117                 if (temps_are_copies(args[0], args[4-tmp])) {
1118                     s->gen_opc_buf[op_index] = INDEX_op_nop;
1119                 } else if (temps[args[4-tmp]].state == TCG_TEMP_CONST) {
1120                     s->gen_opc_buf[op_index] = op_to_movi(op);
1121                     tcg_opt_gen_movi(gen_args, args[0], temps[args[4-tmp]].val);
1122                     gen_args += 2;
1123                 } else {
1124                     s->gen_opc_buf[op_index] = op_to_mov(op);
1125                     tcg_opt_gen_mov(s, gen_args, args[0], args[4-tmp]);
1126                     gen_args += 2;
1127                 }
1128                 args += 6;
1129                 break;
1130             }
1131             goto do_default;
1132
1133         case INDEX_op_add2_i32:
1134         case INDEX_op_sub2_i32:
1135             if (temps[args[2]].state == TCG_TEMP_CONST
1136                 && temps[args[3]].state == TCG_TEMP_CONST
1137                 && temps[args[4]].state == TCG_TEMP_CONST
1138                 && temps[args[5]].state == TCG_TEMP_CONST) {
1139                 uint32_t al = temps[args[2]].val;
1140                 uint32_t ah = temps[args[3]].val;
1141                 uint32_t bl = temps[args[4]].val;
1142                 uint32_t bh = temps[args[5]].val;
1143                 uint64_t a = ((uint64_t)ah << 32) | al;
1144                 uint64_t b = ((uint64_t)bh << 32) | bl;
1145                 TCGArg rl, rh;
1146
1147                 if (op == INDEX_op_add2_i32) {
1148                     a += b;
1149                 } else {
1150                     a -= b;
1151                 }
1152
1153                 /* We emit the extra nop when we emit the add2/sub2.  */
1154                 assert(s->gen_opc_buf[op_index + 1] == INDEX_op_nop);
1155
1156                 rl = args[0];
1157                 rh = args[1];
1158                 s->gen_opc_buf[op_index] = INDEX_op_movi_i32;
1159                 s->gen_opc_buf[++op_index] = INDEX_op_movi_i32;
1160                 tcg_opt_gen_movi(&gen_args[0], rl, (uint32_t)a);
1161                 tcg_opt_gen_movi(&gen_args[2], rh, (uint32_t)(a >> 32));
1162                 gen_args += 4;
1163                 args += 6;
1164                 break;
1165             }
1166             goto do_default;
1167
1168         case INDEX_op_mulu2_i32:
1169             if (temps[args[2]].state == TCG_TEMP_CONST
1170                 && temps[args[3]].state == TCG_TEMP_CONST) {
1171                 uint32_t a = temps[args[2]].val;
1172                 uint32_t b = temps[args[3]].val;
1173                 uint64_t r = (uint64_t)a * b;
1174                 TCGArg rl, rh;
1175
1176                 /* We emit the extra nop when we emit the mulu2.  */
1177                 assert(s->gen_opc_buf[op_index + 1] == INDEX_op_nop);
1178
1179                 rl = args[0];
1180                 rh = args[1];
1181                 s->gen_opc_buf[op_index] = INDEX_op_movi_i32;
1182                 s->gen_opc_buf[++op_index] = INDEX_op_movi_i32;
1183                 tcg_opt_gen_movi(&gen_args[0], rl, (uint32_t)r);
1184                 tcg_opt_gen_movi(&gen_args[2], rh, (uint32_t)(r >> 32));
1185                 gen_args += 4;
1186                 args += 4;
1187                 break;
1188             }
1189             goto do_default;
1190
1191         case INDEX_op_brcond2_i32:
1192             tmp = do_constant_folding_cond2(&args[0], &args[2], args[4]);
1193             if (tmp != 2) {
1194                 if (tmp) {
1195                     reset_all_temps(nb_temps);
1196                     s->gen_opc_buf[op_index] = INDEX_op_br;
1197                     gen_args[0] = args[5];
1198                     gen_args += 1;
1199                 } else {
1200                     s->gen_opc_buf[op_index] = INDEX_op_nop;
1201                 }
1202             } else if ((args[4] == TCG_COND_LT || args[4] == TCG_COND_GE)
1203                        && temps[args[2]].state == TCG_TEMP_CONST
1204                        && temps[args[3]].state == TCG_TEMP_CONST
1205                        && temps[args[2]].val == 0
1206                        && temps[args[3]].val == 0) {
1207                 /* Simplify LT/GE comparisons vs zero to a single compare
1208                    vs the high word of the input.  */
1209                 reset_all_temps(nb_temps);
1210                 s->gen_opc_buf[op_index] = INDEX_op_brcond_i32;
1211                 gen_args[0] = args[1];
1212                 gen_args[1] = args[3];
1213                 gen_args[2] = args[4];
1214                 gen_args[3] = args[5];
1215                 gen_args += 4;
1216             } else {
1217                 goto do_default;
1218             }
1219             args += 6;
1220             break;
1221
1222         case INDEX_op_setcond2_i32:
1223             tmp = do_constant_folding_cond2(&args[1], &args[3], args[5]);
1224             if (tmp != 2) {
1225                 s->gen_opc_buf[op_index] = INDEX_op_movi_i32;
1226                 tcg_opt_gen_movi(gen_args, args[0], tmp);
1227                 gen_args += 2;
1228             } else if ((args[5] == TCG_COND_LT || args[5] == TCG_COND_GE)
1229                        && temps[args[3]].state == TCG_TEMP_CONST
1230                        && temps[args[4]].state == TCG_TEMP_CONST
1231                        && temps[args[3]].val == 0
1232                        && temps[args[4]].val == 0) {
1233                 /* Simplify LT/GE comparisons vs zero to a single compare
1234                    vs the high word of the input.  */
1235                 s->gen_opc_buf[op_index] = INDEX_op_setcond_i32;
1236                 reset_temp(args[0]);
1237                 gen_args[0] = args[0];
1238                 gen_args[1] = args[2];
1239                 gen_args[2] = args[4];
1240                 gen_args[3] = args[5];
1241                 gen_args += 4;
1242             } else {
1243                 goto do_default;
1244             }
1245             args += 6;
1246             break;
1247
1248         case INDEX_op_call:
1249             nb_call_args = (args[0] >> 16) + (args[0] & 0xffff);
1250             if (!(args[nb_call_args + 1] & (TCG_CALL_NO_READ_GLOBALS |
1251                                             TCG_CALL_NO_WRITE_GLOBALS))) {
1252                 for (i = 0; i < nb_globals; i++) {
1253                     reset_temp(i);
1254                 }
1255             }
1256             for (i = 0; i < (args[0] >> 16); i++) {
1257                 reset_temp(args[i + 1]);
1258             }
1259             i = nb_call_args + 3;
1260             while (i) {
1261                 *gen_args = *args;
1262                 args++;
1263                 gen_args++;
1264                 i--;
1265             }
1266             break;
1267
1268         default:
1269         do_default:
1270             /* Default case: we know nothing about operation (or were unable
1271                to compute the operation result) so no propagation is done.
1272                We trash everything if the operation is the end of a basic
1273                block, otherwise we only trash the output args.  "mask" is
1274                the non-zero bits mask for the first output arg.  */
1275             if (def->flags & TCG_OPF_BB_END) {
1276                 reset_all_temps(nb_temps);
1277             } else {
1278                 for (i = 0; i < def->nb_oargs; i++) {
1279                     reset_temp(args[i]);
1280                     /* Save the corresponding known-zero bits mask for the
1281                        first output argument (only one supported so far). */
1282                     if (i == 0) {
1283                         temps[args[i]].mask = mask;
1284                     }
1285                 }
1286             }
1287             for (i = 0; i < def->nb_args; i++) {
1288                 gen_args[i] = args[i];
1289             }
1290             args += def->nb_args;
1291             gen_args += def->nb_args;
1292             break;
1293         }
1294     }
1295
1296     return gen_args;
1297 }
1298
1299 TCGArg *tcg_optimize(TCGContext *s, uint16_t *tcg_opc_ptr,
1300         TCGArg *args, TCGOpDef *tcg_op_defs)
1301 {
1302     TCGArg *res;
1303     res = tcg_constant_folding(s, tcg_opc_ptr, args, tcg_op_defs);
1304     return res;
1305 }