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 "qemu/osdep.h" 27 #include "qemu/int128.h" 28 #include "qemu/interval-tree.h" 29 #include "tcg/tcg-op-common.h" 30 #include "tcg-internal.h" 31 32 #define CASE_OP_32_64(x) \ 33 glue(glue(case INDEX_op_, x), _i32): \ 34 glue(glue(case INDEX_op_, x), _i64) 35 36 #define CASE_OP_32_64_VEC(x) \ 37 glue(glue(case INDEX_op_, x), _i32): \ 38 glue(glue(case INDEX_op_, x), _i64): \ 39 glue(glue(case INDEX_op_, x), _vec) 40 41 typedef struct MemCopyInfo { 42 IntervalTreeNode itree; 43 QSIMPLEQ_ENTRY (MemCopyInfo) next; 44 TCGTemp *ts; 45 TCGType type; 46 } MemCopyInfo; 47 48 typedef struct TempOptInfo { 49 bool is_const; 50 TCGTemp *prev_copy; 51 TCGTemp *next_copy; 52 QSIMPLEQ_HEAD(, MemCopyInfo) mem_copy; 53 uint64_t val; 54 uint64_t z_mask; /* mask bit is 0 if and only if value bit is 0 */ 55 uint64_t s_mask; /* a left-aligned mask of clrsb(value) bits. */ 56 } TempOptInfo; 57 58 typedef struct OptContext { 59 TCGContext *tcg; 60 TCGOp *prev_mb; 61 TCGTempSet temps_used; 62 63 IntervalTreeRoot mem_copy; 64 QSIMPLEQ_HEAD(, MemCopyInfo) mem_free; 65 66 /* In flight values from optimization. */ 67 uint64_t a_mask; /* mask bit is 0 iff value identical to first input */ 68 uint64_t z_mask; /* mask bit is 0 iff value bit is 0 */ 69 uint64_t s_mask; /* mask of clrsb(value) bits */ 70 TCGType type; 71 } OptContext; 72 73 /* Calculate the smask for a specific value. */ 74 static uint64_t smask_from_value(uint64_t value) 75 { 76 int rep = clrsb64(value); 77 return ~(~0ull >> rep); 78 } 79 80 /* 81 * Calculate the smask for a given set of known-zeros. 82 * If there are lots of zeros on the left, we can consider the remainder 83 * an unsigned field, and thus the corresponding signed field is one bit 84 * larger. 85 */ 86 static uint64_t smask_from_zmask(uint64_t zmask) 87 { 88 /* 89 * Only the 0 bits are significant for zmask, thus the msb itself 90 * must be zero, else we have no sign information. 91 */ 92 int rep = clz64(zmask); 93 if (rep == 0) { 94 return 0; 95 } 96 rep -= 1; 97 return ~(~0ull >> rep); 98 } 99 100 /* 101 * Recreate a properly left-aligned smask after manipulation. 102 * Some bit-shuffling, particularly shifts and rotates, may 103 * retain sign bits on the left, but may scatter disconnected 104 * sign bits on the right. Retain only what remains to the left. 105 */ 106 static uint64_t smask_from_smask(int64_t smask) 107 { 108 /* Only the 1 bits are significant for smask */ 109 return smask_from_zmask(~smask); 110 } 111 112 static inline TempOptInfo *ts_info(TCGTemp *ts) 113 { 114 return ts->state_ptr; 115 } 116 117 static inline TempOptInfo *arg_info(TCGArg arg) 118 { 119 return ts_info(arg_temp(arg)); 120 } 121 122 static inline bool ts_is_const(TCGTemp *ts) 123 { 124 return ts_info(ts)->is_const; 125 } 126 127 static inline bool ts_is_const_val(TCGTemp *ts, uint64_t val) 128 { 129 TempOptInfo *ti = ts_info(ts); 130 return ti->is_const && ti->val == val; 131 } 132 133 static inline bool arg_is_const(TCGArg arg) 134 { 135 return ts_is_const(arg_temp(arg)); 136 } 137 138 static inline bool arg_is_const_val(TCGArg arg, uint64_t val) 139 { 140 return ts_is_const_val(arg_temp(arg), val); 141 } 142 143 static inline bool ts_is_copy(TCGTemp *ts) 144 { 145 return ts_info(ts)->next_copy != ts; 146 } 147 148 static TCGTemp *cmp_better_copy(TCGTemp *a, TCGTemp *b) 149 { 150 return a->kind < b->kind ? b : a; 151 } 152 153 /* Initialize and activate a temporary. */ 154 static void init_ts_info(OptContext *ctx, TCGTemp *ts) 155 { 156 size_t idx = temp_idx(ts); 157 TempOptInfo *ti; 158 159 if (test_bit(idx, ctx->temps_used.l)) { 160 return; 161 } 162 set_bit(idx, ctx->temps_used.l); 163 164 ti = ts->state_ptr; 165 if (ti == NULL) { 166 ti = tcg_malloc(sizeof(TempOptInfo)); 167 ts->state_ptr = ti; 168 } 169 170 ti->next_copy = ts; 171 ti->prev_copy = ts; 172 QSIMPLEQ_INIT(&ti->mem_copy); 173 if (ts->kind == TEMP_CONST) { 174 ti->is_const = true; 175 ti->val = ts->val; 176 ti->z_mask = ts->val; 177 ti->s_mask = smask_from_value(ts->val); 178 } else { 179 ti->is_const = false; 180 ti->z_mask = -1; 181 ti->s_mask = 0; 182 } 183 } 184 185 static MemCopyInfo *mem_copy_first(OptContext *ctx, intptr_t s, intptr_t l) 186 { 187 IntervalTreeNode *r = interval_tree_iter_first(&ctx->mem_copy, s, l); 188 return r ? container_of(r, MemCopyInfo, itree) : NULL; 189 } 190 191 static MemCopyInfo *mem_copy_next(MemCopyInfo *mem, intptr_t s, intptr_t l) 192 { 193 IntervalTreeNode *r = interval_tree_iter_next(&mem->itree, s, l); 194 return r ? container_of(r, MemCopyInfo, itree) : NULL; 195 } 196 197 static void remove_mem_copy(OptContext *ctx, MemCopyInfo *mc) 198 { 199 TCGTemp *ts = mc->ts; 200 TempOptInfo *ti = ts_info(ts); 201 202 interval_tree_remove(&mc->itree, &ctx->mem_copy); 203 QSIMPLEQ_REMOVE(&ti->mem_copy, mc, MemCopyInfo, next); 204 QSIMPLEQ_INSERT_TAIL(&ctx->mem_free, mc, next); 205 } 206 207 static void remove_mem_copy_in(OptContext *ctx, intptr_t s, intptr_t l) 208 { 209 while (true) { 210 MemCopyInfo *mc = mem_copy_first(ctx, s, l); 211 if (!mc) { 212 break; 213 } 214 remove_mem_copy(ctx, mc); 215 } 216 } 217 218 static void remove_mem_copy_all(OptContext *ctx) 219 { 220 remove_mem_copy_in(ctx, 0, -1); 221 tcg_debug_assert(interval_tree_is_empty(&ctx->mem_copy)); 222 } 223 224 static TCGTemp *find_better_copy(TCGTemp *ts) 225 { 226 TCGTemp *i, *ret; 227 228 /* If this is already readonly, we can't do better. */ 229 if (temp_readonly(ts)) { 230 return ts; 231 } 232 233 ret = ts; 234 for (i = ts_info(ts)->next_copy; i != ts; i = ts_info(i)->next_copy) { 235 ret = cmp_better_copy(ret, i); 236 } 237 return ret; 238 } 239 240 static void move_mem_copies(TCGTemp *dst_ts, TCGTemp *src_ts) 241 { 242 TempOptInfo *si = ts_info(src_ts); 243 TempOptInfo *di = ts_info(dst_ts); 244 MemCopyInfo *mc; 245 246 QSIMPLEQ_FOREACH(mc, &si->mem_copy, next) { 247 tcg_debug_assert(mc->ts == src_ts); 248 mc->ts = dst_ts; 249 } 250 QSIMPLEQ_CONCAT(&di->mem_copy, &si->mem_copy); 251 } 252 253 /* Reset TEMP's state, possibly removing the temp for the list of copies. */ 254 static void reset_ts(OptContext *ctx, TCGTemp *ts) 255 { 256 TempOptInfo *ti = ts_info(ts); 257 TCGTemp *pts = ti->prev_copy; 258 TCGTemp *nts = ti->next_copy; 259 TempOptInfo *pi = ts_info(pts); 260 TempOptInfo *ni = ts_info(nts); 261 262 ni->prev_copy = ti->prev_copy; 263 pi->next_copy = ti->next_copy; 264 ti->next_copy = ts; 265 ti->prev_copy = ts; 266 ti->is_const = false; 267 ti->z_mask = -1; 268 ti->s_mask = 0; 269 270 if (!QSIMPLEQ_EMPTY(&ti->mem_copy)) { 271 if (ts == nts) { 272 /* Last temp copy being removed, the mem copies die. */ 273 MemCopyInfo *mc; 274 QSIMPLEQ_FOREACH(mc, &ti->mem_copy, next) { 275 interval_tree_remove(&mc->itree, &ctx->mem_copy); 276 } 277 QSIMPLEQ_CONCAT(&ctx->mem_free, &ti->mem_copy); 278 } else { 279 move_mem_copies(find_better_copy(nts), ts); 280 } 281 } 282 } 283 284 static void reset_temp(OptContext *ctx, TCGArg arg) 285 { 286 reset_ts(ctx, arg_temp(arg)); 287 } 288 289 static void record_mem_copy(OptContext *ctx, TCGType type, 290 TCGTemp *ts, intptr_t start, intptr_t last) 291 { 292 MemCopyInfo *mc; 293 TempOptInfo *ti; 294 295 mc = QSIMPLEQ_FIRST(&ctx->mem_free); 296 if (mc) { 297 QSIMPLEQ_REMOVE_HEAD(&ctx->mem_free, next); 298 } else { 299 mc = tcg_malloc(sizeof(*mc)); 300 } 301 302 memset(mc, 0, sizeof(*mc)); 303 mc->itree.start = start; 304 mc->itree.last = last; 305 mc->type = type; 306 interval_tree_insert(&mc->itree, &ctx->mem_copy); 307 308 ts = find_better_copy(ts); 309 ti = ts_info(ts); 310 mc->ts = ts; 311 QSIMPLEQ_INSERT_TAIL(&ti->mem_copy, mc, next); 312 } 313 314 static bool ts_are_copies(TCGTemp *ts1, TCGTemp *ts2) 315 { 316 TCGTemp *i; 317 318 if (ts1 == ts2) { 319 return true; 320 } 321 322 if (!ts_is_copy(ts1) || !ts_is_copy(ts2)) { 323 return false; 324 } 325 326 for (i = ts_info(ts1)->next_copy; i != ts1; i = ts_info(i)->next_copy) { 327 if (i == ts2) { 328 return true; 329 } 330 } 331 332 return false; 333 } 334 335 static bool args_are_copies(TCGArg arg1, TCGArg arg2) 336 { 337 return ts_are_copies(arg_temp(arg1), arg_temp(arg2)); 338 } 339 340 static TCGTemp *find_mem_copy_for(OptContext *ctx, TCGType type, intptr_t s) 341 { 342 MemCopyInfo *mc; 343 344 for (mc = mem_copy_first(ctx, s, s); mc; mc = mem_copy_next(mc, s, s)) { 345 if (mc->itree.start == s && mc->type == type) { 346 return find_better_copy(mc->ts); 347 } 348 } 349 return NULL; 350 } 351 352 static TCGArg arg_new_constant(OptContext *ctx, uint64_t val) 353 { 354 TCGType type = ctx->type; 355 TCGTemp *ts; 356 357 if (type == TCG_TYPE_I32) { 358 val = (int32_t)val; 359 } 360 361 ts = tcg_constant_internal(type, val); 362 init_ts_info(ctx, ts); 363 364 return temp_arg(ts); 365 } 366 367 static TCGArg arg_new_temp(OptContext *ctx) 368 { 369 TCGTemp *ts = tcg_temp_new_internal(ctx->type, TEMP_EBB); 370 init_ts_info(ctx, ts); 371 return temp_arg(ts); 372 } 373 374 static bool tcg_opt_gen_mov(OptContext *ctx, TCGOp *op, TCGArg dst, TCGArg src) 375 { 376 TCGTemp *dst_ts = arg_temp(dst); 377 TCGTemp *src_ts = arg_temp(src); 378 TempOptInfo *di; 379 TempOptInfo *si; 380 TCGOpcode new_op; 381 382 if (ts_are_copies(dst_ts, src_ts)) { 383 tcg_op_remove(ctx->tcg, op); 384 return true; 385 } 386 387 reset_ts(ctx, dst_ts); 388 di = ts_info(dst_ts); 389 si = ts_info(src_ts); 390 391 switch (ctx->type) { 392 case TCG_TYPE_I32: 393 new_op = INDEX_op_mov_i32; 394 break; 395 case TCG_TYPE_I64: 396 new_op = INDEX_op_mov_i64; 397 break; 398 case TCG_TYPE_V64: 399 case TCG_TYPE_V128: 400 case TCG_TYPE_V256: 401 /* TCGOP_VECL and TCGOP_VECE remain unchanged. */ 402 new_op = INDEX_op_mov_vec; 403 break; 404 default: 405 g_assert_not_reached(); 406 } 407 op->opc = new_op; 408 op->args[0] = dst; 409 op->args[1] = src; 410 411 di->z_mask = si->z_mask; 412 di->s_mask = si->s_mask; 413 414 if (src_ts->type == dst_ts->type) { 415 TempOptInfo *ni = ts_info(si->next_copy); 416 417 di->next_copy = si->next_copy; 418 di->prev_copy = src_ts; 419 ni->prev_copy = dst_ts; 420 si->next_copy = dst_ts; 421 di->is_const = si->is_const; 422 di->val = si->val; 423 424 if (!QSIMPLEQ_EMPTY(&si->mem_copy) 425 && cmp_better_copy(src_ts, dst_ts) == dst_ts) { 426 move_mem_copies(dst_ts, src_ts); 427 } 428 } 429 return true; 430 } 431 432 static bool tcg_opt_gen_movi(OptContext *ctx, TCGOp *op, 433 TCGArg dst, uint64_t val) 434 { 435 /* Convert movi to mov with constant temp. */ 436 return tcg_opt_gen_mov(ctx, op, dst, arg_new_constant(ctx, val)); 437 } 438 439 static uint64_t do_constant_folding_2(TCGOpcode op, uint64_t x, uint64_t y) 440 { 441 uint64_t l64, h64; 442 443 switch (op) { 444 CASE_OP_32_64(add): 445 return x + y; 446 447 CASE_OP_32_64(sub): 448 return x - y; 449 450 CASE_OP_32_64(mul): 451 return x * y; 452 453 CASE_OP_32_64_VEC(and): 454 return x & y; 455 456 CASE_OP_32_64_VEC(or): 457 return x | y; 458 459 CASE_OP_32_64_VEC(xor): 460 return x ^ y; 461 462 case INDEX_op_shl_i32: 463 return (uint32_t)x << (y & 31); 464 465 case INDEX_op_shl_i64: 466 return (uint64_t)x << (y & 63); 467 468 case INDEX_op_shr_i32: 469 return (uint32_t)x >> (y & 31); 470 471 case INDEX_op_shr_i64: 472 return (uint64_t)x >> (y & 63); 473 474 case INDEX_op_sar_i32: 475 return (int32_t)x >> (y & 31); 476 477 case INDEX_op_sar_i64: 478 return (int64_t)x >> (y & 63); 479 480 case INDEX_op_rotr_i32: 481 return ror32(x, y & 31); 482 483 case INDEX_op_rotr_i64: 484 return ror64(x, y & 63); 485 486 case INDEX_op_rotl_i32: 487 return rol32(x, y & 31); 488 489 case INDEX_op_rotl_i64: 490 return rol64(x, y & 63); 491 492 CASE_OP_32_64_VEC(not): 493 return ~x; 494 495 CASE_OP_32_64(neg): 496 return -x; 497 498 CASE_OP_32_64_VEC(andc): 499 return x & ~y; 500 501 CASE_OP_32_64_VEC(orc): 502 return x | ~y; 503 504 CASE_OP_32_64_VEC(eqv): 505 return ~(x ^ y); 506 507 CASE_OP_32_64_VEC(nand): 508 return ~(x & y); 509 510 CASE_OP_32_64_VEC(nor): 511 return ~(x | y); 512 513 case INDEX_op_clz_i32: 514 return (uint32_t)x ? clz32(x) : y; 515 516 case INDEX_op_clz_i64: 517 return x ? clz64(x) : y; 518 519 case INDEX_op_ctz_i32: 520 return (uint32_t)x ? ctz32(x) : y; 521 522 case INDEX_op_ctz_i64: 523 return x ? ctz64(x) : y; 524 525 case INDEX_op_ctpop_i32: 526 return ctpop32(x); 527 528 case INDEX_op_ctpop_i64: 529 return ctpop64(x); 530 531 CASE_OP_32_64(ext8s): 532 return (int8_t)x; 533 534 CASE_OP_32_64(ext16s): 535 return (int16_t)x; 536 537 CASE_OP_32_64(ext8u): 538 return (uint8_t)x; 539 540 CASE_OP_32_64(ext16u): 541 return (uint16_t)x; 542 543 CASE_OP_32_64(bswap16): 544 x = bswap16(x); 545 return y & TCG_BSWAP_OS ? (int16_t)x : x; 546 547 CASE_OP_32_64(bswap32): 548 x = bswap32(x); 549 return y & TCG_BSWAP_OS ? (int32_t)x : x; 550 551 case INDEX_op_bswap64_i64: 552 return bswap64(x); 553 554 case INDEX_op_ext_i32_i64: 555 case INDEX_op_ext32s_i64: 556 return (int32_t)x; 557 558 case INDEX_op_extu_i32_i64: 559 case INDEX_op_extrl_i64_i32: 560 case INDEX_op_ext32u_i64: 561 return (uint32_t)x; 562 563 case INDEX_op_extrh_i64_i32: 564 return (uint64_t)x >> 32; 565 566 case INDEX_op_muluh_i32: 567 return ((uint64_t)(uint32_t)x * (uint32_t)y) >> 32; 568 case INDEX_op_mulsh_i32: 569 return ((int64_t)(int32_t)x * (int32_t)y) >> 32; 570 571 case INDEX_op_muluh_i64: 572 mulu64(&l64, &h64, x, y); 573 return h64; 574 case INDEX_op_mulsh_i64: 575 muls64(&l64, &h64, x, y); 576 return h64; 577 578 case INDEX_op_div_i32: 579 /* Avoid crashing on divide by zero, otherwise undefined. */ 580 return (int32_t)x / ((int32_t)y ? : 1); 581 case INDEX_op_divu_i32: 582 return (uint32_t)x / ((uint32_t)y ? : 1); 583 case INDEX_op_div_i64: 584 return (int64_t)x / ((int64_t)y ? : 1); 585 case INDEX_op_divu_i64: 586 return (uint64_t)x / ((uint64_t)y ? : 1); 587 588 case INDEX_op_rem_i32: 589 return (int32_t)x % ((int32_t)y ? : 1); 590 case INDEX_op_remu_i32: 591 return (uint32_t)x % ((uint32_t)y ? : 1); 592 case INDEX_op_rem_i64: 593 return (int64_t)x % ((int64_t)y ? : 1); 594 case INDEX_op_remu_i64: 595 return (uint64_t)x % ((uint64_t)y ? : 1); 596 597 default: 598 g_assert_not_reached(); 599 } 600 } 601 602 static uint64_t do_constant_folding(TCGOpcode op, TCGType type, 603 uint64_t x, uint64_t y) 604 { 605 uint64_t res = do_constant_folding_2(op, x, y); 606 if (type == TCG_TYPE_I32) { 607 res = (int32_t)res; 608 } 609 return res; 610 } 611 612 static bool do_constant_folding_cond_32(uint32_t x, uint32_t y, TCGCond c) 613 { 614 switch (c) { 615 case TCG_COND_EQ: 616 return x == y; 617 case TCG_COND_NE: 618 return x != y; 619 case TCG_COND_LT: 620 return (int32_t)x < (int32_t)y; 621 case TCG_COND_GE: 622 return (int32_t)x >= (int32_t)y; 623 case TCG_COND_LE: 624 return (int32_t)x <= (int32_t)y; 625 case TCG_COND_GT: 626 return (int32_t)x > (int32_t)y; 627 case TCG_COND_LTU: 628 return x < y; 629 case TCG_COND_GEU: 630 return x >= y; 631 case TCG_COND_LEU: 632 return x <= y; 633 case TCG_COND_GTU: 634 return x > y; 635 case TCG_COND_TSTEQ: 636 return (x & y) == 0; 637 case TCG_COND_TSTNE: 638 return (x & y) != 0; 639 case TCG_COND_ALWAYS: 640 case TCG_COND_NEVER: 641 break; 642 } 643 g_assert_not_reached(); 644 } 645 646 static bool do_constant_folding_cond_64(uint64_t x, uint64_t y, TCGCond c) 647 { 648 switch (c) { 649 case TCG_COND_EQ: 650 return x == y; 651 case TCG_COND_NE: 652 return x != y; 653 case TCG_COND_LT: 654 return (int64_t)x < (int64_t)y; 655 case TCG_COND_GE: 656 return (int64_t)x >= (int64_t)y; 657 case TCG_COND_LE: 658 return (int64_t)x <= (int64_t)y; 659 case TCG_COND_GT: 660 return (int64_t)x > (int64_t)y; 661 case TCG_COND_LTU: 662 return x < y; 663 case TCG_COND_GEU: 664 return x >= y; 665 case TCG_COND_LEU: 666 return x <= y; 667 case TCG_COND_GTU: 668 return x > y; 669 case TCG_COND_TSTEQ: 670 return (x & y) == 0; 671 case TCG_COND_TSTNE: 672 return (x & y) != 0; 673 case TCG_COND_ALWAYS: 674 case TCG_COND_NEVER: 675 break; 676 } 677 g_assert_not_reached(); 678 } 679 680 static int do_constant_folding_cond_eq(TCGCond c) 681 { 682 switch (c) { 683 case TCG_COND_GT: 684 case TCG_COND_LTU: 685 case TCG_COND_LT: 686 case TCG_COND_GTU: 687 case TCG_COND_NE: 688 return 0; 689 case TCG_COND_GE: 690 case TCG_COND_GEU: 691 case TCG_COND_LE: 692 case TCG_COND_LEU: 693 case TCG_COND_EQ: 694 return 1; 695 case TCG_COND_TSTEQ: 696 case TCG_COND_TSTNE: 697 return -1; 698 case TCG_COND_ALWAYS: 699 case TCG_COND_NEVER: 700 break; 701 } 702 g_assert_not_reached(); 703 } 704 705 /* 706 * Return -1 if the condition can't be simplified, 707 * and the result of the condition (0 or 1) if it can. 708 */ 709 static int do_constant_folding_cond(TCGType type, TCGArg x, 710 TCGArg y, TCGCond c) 711 { 712 if (arg_is_const(x) && arg_is_const(y)) { 713 uint64_t xv = arg_info(x)->val; 714 uint64_t yv = arg_info(y)->val; 715 716 switch (type) { 717 case TCG_TYPE_I32: 718 return do_constant_folding_cond_32(xv, yv, c); 719 case TCG_TYPE_I64: 720 return do_constant_folding_cond_64(xv, yv, c); 721 default: 722 /* Only scalar comparisons are optimizable */ 723 return -1; 724 } 725 } else if (args_are_copies(x, y)) { 726 return do_constant_folding_cond_eq(c); 727 } else if (arg_is_const_val(y, 0)) { 728 switch (c) { 729 case TCG_COND_LTU: 730 case TCG_COND_TSTNE: 731 return 0; 732 case TCG_COND_GEU: 733 case TCG_COND_TSTEQ: 734 return 1; 735 default: 736 return -1; 737 } 738 } 739 return -1; 740 } 741 742 /** 743 * swap_commutative: 744 * @dest: TCGArg of the destination argument, or NO_DEST. 745 * @p1: first paired argument 746 * @p2: second paired argument 747 * 748 * If *@p1 is a constant and *@p2 is not, swap. 749 * If *@p2 matches @dest, swap. 750 * Return true if a swap was performed. 751 */ 752 753 #define NO_DEST temp_arg(NULL) 754 755 static bool swap_commutative(TCGArg dest, TCGArg *p1, TCGArg *p2) 756 { 757 TCGArg a1 = *p1, a2 = *p2; 758 int sum = 0; 759 sum += arg_is_const(a1); 760 sum -= arg_is_const(a2); 761 762 /* Prefer the constant in second argument, and then the form 763 op a, a, b, which is better handled on non-RISC hosts. */ 764 if (sum > 0 || (sum == 0 && dest == a2)) { 765 *p1 = a2; 766 *p2 = a1; 767 return true; 768 } 769 return false; 770 } 771 772 static bool swap_commutative2(TCGArg *p1, TCGArg *p2) 773 { 774 int sum = 0; 775 sum += arg_is_const(p1[0]); 776 sum += arg_is_const(p1[1]); 777 sum -= arg_is_const(p2[0]); 778 sum -= arg_is_const(p2[1]); 779 if (sum > 0) { 780 TCGArg t; 781 t = p1[0], p1[0] = p2[0], p2[0] = t; 782 t = p1[1], p1[1] = p2[1], p2[1] = t; 783 return true; 784 } 785 return false; 786 } 787 788 /* 789 * Return -1 if the condition can't be simplified, 790 * and the result of the condition (0 or 1) if it can. 791 */ 792 static int do_constant_folding_cond1(OptContext *ctx, TCGOp *op, TCGArg dest, 793 TCGArg *p1, TCGArg *p2, TCGArg *pcond) 794 { 795 TCGCond cond; 796 bool swap; 797 int r; 798 799 swap = swap_commutative(dest, p1, p2); 800 cond = *pcond; 801 if (swap) { 802 *pcond = cond = tcg_swap_cond(cond); 803 } 804 805 r = do_constant_folding_cond(ctx->type, *p1, *p2, cond); 806 if (r >= 0) { 807 return r; 808 } 809 if (!is_tst_cond(cond)) { 810 return -1; 811 } 812 813 /* 814 * TSTNE x,x -> NE x,0 815 * TSTNE x,-1 -> NE x,0 816 */ 817 if (args_are_copies(*p1, *p2) || arg_is_const_val(*p2, -1)) { 818 *p2 = arg_new_constant(ctx, 0); 819 *pcond = tcg_tst_eqne_cond(cond); 820 return -1; 821 } 822 823 /* TSTNE x,sign -> LT x,0 */ 824 if (arg_is_const_val(*p2, (ctx->type == TCG_TYPE_I32 825 ? INT32_MIN : INT64_MIN))) { 826 *p2 = arg_new_constant(ctx, 0); 827 *pcond = tcg_tst_ltge_cond(cond); 828 return -1; 829 } 830 831 /* Expand to AND with a temporary if no backend support. */ 832 if (!TCG_TARGET_HAS_tst) { 833 TCGOpcode and_opc = (ctx->type == TCG_TYPE_I32 834 ? INDEX_op_and_i32 : INDEX_op_and_i64); 835 TCGOp *op2 = tcg_op_insert_before(ctx->tcg, op, and_opc, 3); 836 TCGArg tmp = arg_new_temp(ctx); 837 838 op2->args[0] = tmp; 839 op2->args[1] = *p1; 840 op2->args[2] = *p2; 841 842 *p1 = tmp; 843 *p2 = arg_new_constant(ctx, 0); 844 *pcond = tcg_tst_eqne_cond(cond); 845 } 846 return -1; 847 } 848 849 static int do_constant_folding_cond2(OptContext *ctx, TCGOp *op, TCGArg *args) 850 { 851 TCGArg al, ah, bl, bh; 852 TCGCond c; 853 bool swap; 854 int r; 855 856 swap = swap_commutative2(args, args + 2); 857 c = args[4]; 858 if (swap) { 859 args[4] = c = tcg_swap_cond(c); 860 } 861 862 al = args[0]; 863 ah = args[1]; 864 bl = args[2]; 865 bh = args[3]; 866 867 if (arg_is_const(bl) && arg_is_const(bh)) { 868 tcg_target_ulong blv = arg_info(bl)->val; 869 tcg_target_ulong bhv = arg_info(bh)->val; 870 uint64_t b = deposit64(blv, 32, 32, bhv); 871 872 if (arg_is_const(al) && arg_is_const(ah)) { 873 tcg_target_ulong alv = arg_info(al)->val; 874 tcg_target_ulong ahv = arg_info(ah)->val; 875 uint64_t a = deposit64(alv, 32, 32, ahv); 876 877 r = do_constant_folding_cond_64(a, b, c); 878 if (r >= 0) { 879 return r; 880 } 881 } 882 883 if (b == 0) { 884 switch (c) { 885 case TCG_COND_LTU: 886 case TCG_COND_TSTNE: 887 return 0; 888 case TCG_COND_GEU: 889 case TCG_COND_TSTEQ: 890 return 1; 891 default: 892 break; 893 } 894 } 895 896 /* TSTNE x,-1 -> NE x,0 */ 897 if (b == -1 && is_tst_cond(c)) { 898 args[3] = args[2] = arg_new_constant(ctx, 0); 899 args[4] = tcg_tst_eqne_cond(c); 900 return -1; 901 } 902 903 /* TSTNE x,sign -> LT x,0 */ 904 if (b == INT64_MIN && is_tst_cond(c)) { 905 /* bl must be 0, so copy that to bh */ 906 args[3] = bl; 907 args[4] = tcg_tst_ltge_cond(c); 908 return -1; 909 } 910 } 911 912 if (args_are_copies(al, bl) && args_are_copies(ah, bh)) { 913 r = do_constant_folding_cond_eq(c); 914 if (r >= 0) { 915 return r; 916 } 917 918 /* TSTNE x,x -> NE x,0 */ 919 if (is_tst_cond(c)) { 920 args[3] = args[2] = arg_new_constant(ctx, 0); 921 args[4] = tcg_tst_eqne_cond(c); 922 return -1; 923 } 924 } 925 926 /* Expand to AND with a temporary if no backend support. */ 927 if (!TCG_TARGET_HAS_tst && is_tst_cond(c)) { 928 TCGOp *op1 = tcg_op_insert_before(ctx->tcg, op, INDEX_op_and_i32, 3); 929 TCGOp *op2 = tcg_op_insert_before(ctx->tcg, op, INDEX_op_and_i32, 3); 930 TCGArg t1 = arg_new_temp(ctx); 931 TCGArg t2 = arg_new_temp(ctx); 932 933 op1->args[0] = t1; 934 op1->args[1] = al; 935 op1->args[2] = bl; 936 op2->args[0] = t2; 937 op2->args[1] = ah; 938 op2->args[2] = bh; 939 940 args[0] = t1; 941 args[1] = t2; 942 args[3] = args[2] = arg_new_constant(ctx, 0); 943 args[4] = tcg_tst_eqne_cond(c); 944 } 945 return -1; 946 } 947 948 static void init_arguments(OptContext *ctx, TCGOp *op, int nb_args) 949 { 950 for (int i = 0; i < nb_args; i++) { 951 TCGTemp *ts = arg_temp(op->args[i]); 952 init_ts_info(ctx, ts); 953 } 954 } 955 956 static void copy_propagate(OptContext *ctx, TCGOp *op, 957 int nb_oargs, int nb_iargs) 958 { 959 for (int i = nb_oargs; i < nb_oargs + nb_iargs; i++) { 960 TCGTemp *ts = arg_temp(op->args[i]); 961 if (ts_is_copy(ts)) { 962 op->args[i] = temp_arg(find_better_copy(ts)); 963 } 964 } 965 } 966 967 static void finish_folding(OptContext *ctx, TCGOp *op) 968 { 969 const TCGOpDef *def = &tcg_op_defs[op->opc]; 970 int i, nb_oargs; 971 972 /* 973 * We only optimize extended basic blocks. If the opcode ends a BB 974 * and is not a conditional branch, reset all temp data. 975 */ 976 if (def->flags & TCG_OPF_BB_END) { 977 ctx->prev_mb = NULL; 978 if (!(def->flags & TCG_OPF_COND_BRANCH)) { 979 memset(&ctx->temps_used, 0, sizeof(ctx->temps_used)); 980 remove_mem_copy_all(ctx); 981 } 982 return; 983 } 984 985 nb_oargs = def->nb_oargs; 986 for (i = 0; i < nb_oargs; i++) { 987 TCGTemp *ts = arg_temp(op->args[i]); 988 reset_ts(ctx, ts); 989 /* 990 * Save the corresponding known-zero/sign bits mask for the 991 * first output argument (only one supported so far). 992 */ 993 if (i == 0) { 994 ts_info(ts)->z_mask = ctx->z_mask; 995 ts_info(ts)->s_mask = ctx->s_mask; 996 } 997 } 998 } 999 1000 /* 1001 * The fold_* functions return true when processing is complete, 1002 * usually by folding the operation to a constant or to a copy, 1003 * and calling tcg_opt_gen_{mov,movi}. They may do other things, 1004 * like collect information about the value produced, for use in 1005 * optimizing a subsequent operation. 1006 * 1007 * These first fold_* functions are all helpers, used by other 1008 * folders for more specific operations. 1009 */ 1010 1011 static bool fold_const1(OptContext *ctx, TCGOp *op) 1012 { 1013 if (arg_is_const(op->args[1])) { 1014 uint64_t t; 1015 1016 t = arg_info(op->args[1])->val; 1017 t = do_constant_folding(op->opc, ctx->type, t, 0); 1018 return tcg_opt_gen_movi(ctx, op, op->args[0], t); 1019 } 1020 return false; 1021 } 1022 1023 static bool fold_const2(OptContext *ctx, TCGOp *op) 1024 { 1025 if (arg_is_const(op->args[1]) && arg_is_const(op->args[2])) { 1026 uint64_t t1 = arg_info(op->args[1])->val; 1027 uint64_t t2 = arg_info(op->args[2])->val; 1028 1029 t1 = do_constant_folding(op->opc, ctx->type, t1, t2); 1030 return tcg_opt_gen_movi(ctx, op, op->args[0], t1); 1031 } 1032 return false; 1033 } 1034 1035 static bool fold_commutative(OptContext *ctx, TCGOp *op) 1036 { 1037 swap_commutative(op->args[0], &op->args[1], &op->args[2]); 1038 return false; 1039 } 1040 1041 static bool fold_const2_commutative(OptContext *ctx, TCGOp *op) 1042 { 1043 swap_commutative(op->args[0], &op->args[1], &op->args[2]); 1044 return fold_const2(ctx, op); 1045 } 1046 1047 static bool fold_masks(OptContext *ctx, TCGOp *op) 1048 { 1049 uint64_t a_mask = ctx->a_mask; 1050 uint64_t z_mask = ctx->z_mask; 1051 uint64_t s_mask = ctx->s_mask; 1052 1053 /* 1054 * 32-bit ops generate 32-bit results, which for the purpose of 1055 * simplifying tcg are sign-extended. Certainly that's how we 1056 * represent our constants elsewhere. Note that the bits will 1057 * be reset properly for a 64-bit value when encountering the 1058 * type changing opcodes. 1059 */ 1060 if (ctx->type == TCG_TYPE_I32) { 1061 a_mask = (int32_t)a_mask; 1062 z_mask = (int32_t)z_mask; 1063 s_mask |= MAKE_64BIT_MASK(32, 32); 1064 ctx->z_mask = z_mask; 1065 ctx->s_mask = s_mask; 1066 } 1067 1068 if (z_mask == 0) { 1069 return tcg_opt_gen_movi(ctx, op, op->args[0], 0); 1070 } 1071 if (a_mask == 0) { 1072 return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[1]); 1073 } 1074 return false; 1075 } 1076 1077 /* 1078 * Convert @op to NOT, if NOT is supported by the host. 1079 * Return true f the conversion is successful, which will still 1080 * indicate that the processing is complete. 1081 */ 1082 static bool fold_not(OptContext *ctx, TCGOp *op); 1083 static bool fold_to_not(OptContext *ctx, TCGOp *op, int idx) 1084 { 1085 TCGOpcode not_op; 1086 bool have_not; 1087 1088 switch (ctx->type) { 1089 case TCG_TYPE_I32: 1090 not_op = INDEX_op_not_i32; 1091 have_not = TCG_TARGET_HAS_not_i32; 1092 break; 1093 case TCG_TYPE_I64: 1094 not_op = INDEX_op_not_i64; 1095 have_not = TCG_TARGET_HAS_not_i64; 1096 break; 1097 case TCG_TYPE_V64: 1098 case TCG_TYPE_V128: 1099 case TCG_TYPE_V256: 1100 not_op = INDEX_op_not_vec; 1101 have_not = TCG_TARGET_HAS_not_vec; 1102 break; 1103 default: 1104 g_assert_not_reached(); 1105 } 1106 if (have_not) { 1107 op->opc = not_op; 1108 op->args[1] = op->args[idx]; 1109 return fold_not(ctx, op); 1110 } 1111 return false; 1112 } 1113 1114 /* If the binary operation has first argument @i, fold to @i. */ 1115 static bool fold_ix_to_i(OptContext *ctx, TCGOp *op, uint64_t i) 1116 { 1117 if (arg_is_const_val(op->args[1], i)) { 1118 return tcg_opt_gen_movi(ctx, op, op->args[0], i); 1119 } 1120 return false; 1121 } 1122 1123 /* If the binary operation has first argument @i, fold to NOT. */ 1124 static bool fold_ix_to_not(OptContext *ctx, TCGOp *op, uint64_t i) 1125 { 1126 if (arg_is_const_val(op->args[1], i)) { 1127 return fold_to_not(ctx, op, 2); 1128 } 1129 return false; 1130 } 1131 1132 /* If the binary operation has second argument @i, fold to @i. */ 1133 static bool fold_xi_to_i(OptContext *ctx, TCGOp *op, uint64_t i) 1134 { 1135 if (arg_is_const_val(op->args[2], i)) { 1136 return tcg_opt_gen_movi(ctx, op, op->args[0], i); 1137 } 1138 return false; 1139 } 1140 1141 /* If the binary operation has second argument @i, fold to identity. */ 1142 static bool fold_xi_to_x(OptContext *ctx, TCGOp *op, uint64_t i) 1143 { 1144 if (arg_is_const_val(op->args[2], i)) { 1145 return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[1]); 1146 } 1147 return false; 1148 } 1149 1150 /* If the binary operation has second argument @i, fold to NOT. */ 1151 static bool fold_xi_to_not(OptContext *ctx, TCGOp *op, uint64_t i) 1152 { 1153 if (arg_is_const_val(op->args[2], i)) { 1154 return fold_to_not(ctx, op, 1); 1155 } 1156 return false; 1157 } 1158 1159 /* If the binary operation has both arguments equal, fold to @i. */ 1160 static bool fold_xx_to_i(OptContext *ctx, TCGOp *op, uint64_t i) 1161 { 1162 if (args_are_copies(op->args[1], op->args[2])) { 1163 return tcg_opt_gen_movi(ctx, op, op->args[0], i); 1164 } 1165 return false; 1166 } 1167 1168 /* If the binary operation has both arguments equal, fold to identity. */ 1169 static bool fold_xx_to_x(OptContext *ctx, TCGOp *op) 1170 { 1171 if (args_are_copies(op->args[1], op->args[2])) { 1172 return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[1]); 1173 } 1174 return false; 1175 } 1176 1177 /* 1178 * These outermost fold_<op> functions are sorted alphabetically. 1179 * 1180 * The ordering of the transformations should be: 1181 * 1) those that produce a constant 1182 * 2) those that produce a copy 1183 * 3) those that produce information about the result value. 1184 */ 1185 1186 static bool fold_add(OptContext *ctx, TCGOp *op) 1187 { 1188 if (fold_const2_commutative(ctx, op) || 1189 fold_xi_to_x(ctx, op, 0)) { 1190 return true; 1191 } 1192 return false; 1193 } 1194 1195 /* We cannot as yet do_constant_folding with vectors. */ 1196 static bool fold_add_vec(OptContext *ctx, TCGOp *op) 1197 { 1198 if (fold_commutative(ctx, op) || 1199 fold_xi_to_x(ctx, op, 0)) { 1200 return true; 1201 } 1202 return false; 1203 } 1204 1205 static bool fold_addsub2(OptContext *ctx, TCGOp *op, bool add) 1206 { 1207 bool a_const = arg_is_const(op->args[2]) && arg_is_const(op->args[3]); 1208 bool b_const = arg_is_const(op->args[4]) && arg_is_const(op->args[5]); 1209 1210 if (a_const && b_const) { 1211 uint64_t al = arg_info(op->args[2])->val; 1212 uint64_t ah = arg_info(op->args[3])->val; 1213 uint64_t bl = arg_info(op->args[4])->val; 1214 uint64_t bh = arg_info(op->args[5])->val; 1215 TCGArg rl, rh; 1216 TCGOp *op2; 1217 1218 if (ctx->type == TCG_TYPE_I32) { 1219 uint64_t a = deposit64(al, 32, 32, ah); 1220 uint64_t b = deposit64(bl, 32, 32, bh); 1221 1222 if (add) { 1223 a += b; 1224 } else { 1225 a -= b; 1226 } 1227 1228 al = sextract64(a, 0, 32); 1229 ah = sextract64(a, 32, 32); 1230 } else { 1231 Int128 a = int128_make128(al, ah); 1232 Int128 b = int128_make128(bl, bh); 1233 1234 if (add) { 1235 a = int128_add(a, b); 1236 } else { 1237 a = int128_sub(a, b); 1238 } 1239 1240 al = int128_getlo(a); 1241 ah = int128_gethi(a); 1242 } 1243 1244 rl = op->args[0]; 1245 rh = op->args[1]; 1246 1247 /* The proper opcode is supplied by tcg_opt_gen_mov. */ 1248 op2 = tcg_op_insert_before(ctx->tcg, op, 0, 2); 1249 1250 tcg_opt_gen_movi(ctx, op, rl, al); 1251 tcg_opt_gen_movi(ctx, op2, rh, ah); 1252 return true; 1253 } 1254 1255 /* Fold sub2 r,x,i to add2 r,x,-i */ 1256 if (!add && b_const) { 1257 uint64_t bl = arg_info(op->args[4])->val; 1258 uint64_t bh = arg_info(op->args[5])->val; 1259 1260 /* Negate the two parts without assembling and disassembling. */ 1261 bl = -bl; 1262 bh = ~bh + !bl; 1263 1264 op->opc = (ctx->type == TCG_TYPE_I32 1265 ? INDEX_op_add2_i32 : INDEX_op_add2_i64); 1266 op->args[4] = arg_new_constant(ctx, bl); 1267 op->args[5] = arg_new_constant(ctx, bh); 1268 } 1269 return false; 1270 } 1271 1272 static bool fold_add2(OptContext *ctx, TCGOp *op) 1273 { 1274 /* Note that the high and low parts may be independently swapped. */ 1275 swap_commutative(op->args[0], &op->args[2], &op->args[4]); 1276 swap_commutative(op->args[1], &op->args[3], &op->args[5]); 1277 1278 return fold_addsub2(ctx, op, true); 1279 } 1280 1281 static bool fold_and(OptContext *ctx, TCGOp *op) 1282 { 1283 uint64_t z1, z2; 1284 1285 if (fold_const2_commutative(ctx, op) || 1286 fold_xi_to_i(ctx, op, 0) || 1287 fold_xi_to_x(ctx, op, -1) || 1288 fold_xx_to_x(ctx, op)) { 1289 return true; 1290 } 1291 1292 z1 = arg_info(op->args[1])->z_mask; 1293 z2 = arg_info(op->args[2])->z_mask; 1294 ctx->z_mask = z1 & z2; 1295 1296 /* 1297 * Sign repetitions are perforce all identical, whether they are 1 or 0. 1298 * Bitwise operations preserve the relative quantity of the repetitions. 1299 */ 1300 ctx->s_mask = arg_info(op->args[1])->s_mask 1301 & arg_info(op->args[2])->s_mask; 1302 1303 /* 1304 * Known-zeros does not imply known-ones. Therefore unless 1305 * arg2 is constant, we can't infer affected bits from it. 1306 */ 1307 if (arg_is_const(op->args[2])) { 1308 ctx->a_mask = z1 & ~z2; 1309 } 1310 1311 return fold_masks(ctx, op); 1312 } 1313 1314 static bool fold_andc(OptContext *ctx, TCGOp *op) 1315 { 1316 uint64_t z1; 1317 1318 if (fold_const2(ctx, op) || 1319 fold_xx_to_i(ctx, op, 0) || 1320 fold_xi_to_x(ctx, op, 0) || 1321 fold_ix_to_not(ctx, op, -1)) { 1322 return true; 1323 } 1324 1325 z1 = arg_info(op->args[1])->z_mask; 1326 1327 /* 1328 * Known-zeros does not imply known-ones. Therefore unless 1329 * arg2 is constant, we can't infer anything from it. 1330 */ 1331 if (arg_is_const(op->args[2])) { 1332 uint64_t z2 = ~arg_info(op->args[2])->z_mask; 1333 ctx->a_mask = z1 & ~z2; 1334 z1 &= z2; 1335 } 1336 ctx->z_mask = z1; 1337 1338 ctx->s_mask = arg_info(op->args[1])->s_mask 1339 & arg_info(op->args[2])->s_mask; 1340 return fold_masks(ctx, op); 1341 } 1342 1343 static bool fold_brcond(OptContext *ctx, TCGOp *op) 1344 { 1345 int i = do_constant_folding_cond1(ctx, op, NO_DEST, &op->args[0], 1346 &op->args[1], &op->args[2]); 1347 if (i == 0) { 1348 tcg_op_remove(ctx->tcg, op); 1349 return true; 1350 } 1351 if (i > 0) { 1352 op->opc = INDEX_op_br; 1353 op->args[0] = op->args[3]; 1354 } 1355 return false; 1356 } 1357 1358 static bool fold_brcond2(OptContext *ctx, TCGOp *op) 1359 { 1360 TCGCond cond; 1361 TCGArg label; 1362 int i, inv = 0; 1363 1364 i = do_constant_folding_cond2(ctx, op, &op->args[0]); 1365 cond = op->args[4]; 1366 label = op->args[5]; 1367 if (i >= 0) { 1368 goto do_brcond_const; 1369 } 1370 1371 switch (cond) { 1372 case TCG_COND_LT: 1373 case TCG_COND_GE: 1374 /* 1375 * Simplify LT/GE comparisons vs zero to a single compare 1376 * vs the high word of the input. 1377 */ 1378 if (arg_is_const_val(op->args[2], 0) && 1379 arg_is_const_val(op->args[3], 0)) { 1380 goto do_brcond_high; 1381 } 1382 break; 1383 1384 case TCG_COND_NE: 1385 inv = 1; 1386 QEMU_FALLTHROUGH; 1387 case TCG_COND_EQ: 1388 /* 1389 * Simplify EQ/NE comparisons where one of the pairs 1390 * can be simplified. 1391 */ 1392 i = do_constant_folding_cond(TCG_TYPE_I32, op->args[0], 1393 op->args[2], cond); 1394 switch (i ^ inv) { 1395 case 0: 1396 goto do_brcond_const; 1397 case 1: 1398 goto do_brcond_high; 1399 } 1400 1401 i = do_constant_folding_cond(TCG_TYPE_I32, op->args[1], 1402 op->args[3], cond); 1403 switch (i ^ inv) { 1404 case 0: 1405 goto do_brcond_const; 1406 case 1: 1407 goto do_brcond_low; 1408 } 1409 break; 1410 1411 case TCG_COND_TSTEQ: 1412 case TCG_COND_TSTNE: 1413 if (arg_is_const_val(op->args[2], 0)) { 1414 goto do_brcond_high; 1415 } 1416 if (arg_is_const_val(op->args[3], 0)) { 1417 goto do_brcond_low; 1418 } 1419 break; 1420 1421 default: 1422 break; 1423 1424 do_brcond_low: 1425 op->opc = INDEX_op_brcond_i32; 1426 op->args[1] = op->args[2]; 1427 op->args[2] = cond; 1428 op->args[3] = label; 1429 return fold_brcond(ctx, op); 1430 1431 do_brcond_high: 1432 op->opc = INDEX_op_brcond_i32; 1433 op->args[0] = op->args[1]; 1434 op->args[1] = op->args[3]; 1435 op->args[2] = cond; 1436 op->args[3] = label; 1437 return fold_brcond(ctx, op); 1438 1439 do_brcond_const: 1440 if (i == 0) { 1441 tcg_op_remove(ctx->tcg, op); 1442 return true; 1443 } 1444 op->opc = INDEX_op_br; 1445 op->args[0] = label; 1446 break; 1447 } 1448 return false; 1449 } 1450 1451 static bool fold_bswap(OptContext *ctx, TCGOp *op) 1452 { 1453 uint64_t z_mask, s_mask, sign; 1454 1455 if (arg_is_const(op->args[1])) { 1456 uint64_t t = arg_info(op->args[1])->val; 1457 1458 t = do_constant_folding(op->opc, ctx->type, t, op->args[2]); 1459 return tcg_opt_gen_movi(ctx, op, op->args[0], t); 1460 } 1461 1462 z_mask = arg_info(op->args[1])->z_mask; 1463 1464 switch (op->opc) { 1465 case INDEX_op_bswap16_i32: 1466 case INDEX_op_bswap16_i64: 1467 z_mask = bswap16(z_mask); 1468 sign = INT16_MIN; 1469 break; 1470 case INDEX_op_bswap32_i32: 1471 case INDEX_op_bswap32_i64: 1472 z_mask = bswap32(z_mask); 1473 sign = INT32_MIN; 1474 break; 1475 case INDEX_op_bswap64_i64: 1476 z_mask = bswap64(z_mask); 1477 sign = INT64_MIN; 1478 break; 1479 default: 1480 g_assert_not_reached(); 1481 } 1482 s_mask = smask_from_zmask(z_mask); 1483 1484 switch (op->args[2] & (TCG_BSWAP_OZ | TCG_BSWAP_OS)) { 1485 case TCG_BSWAP_OZ: 1486 break; 1487 case TCG_BSWAP_OS: 1488 /* If the sign bit may be 1, force all the bits above to 1. */ 1489 if (z_mask & sign) { 1490 z_mask |= sign; 1491 s_mask = sign << 1; 1492 } 1493 break; 1494 default: 1495 /* The high bits are undefined: force all bits above the sign to 1. */ 1496 z_mask |= sign << 1; 1497 s_mask = 0; 1498 break; 1499 } 1500 ctx->z_mask = z_mask; 1501 ctx->s_mask = s_mask; 1502 1503 return fold_masks(ctx, op); 1504 } 1505 1506 static bool fold_call(OptContext *ctx, TCGOp *op) 1507 { 1508 TCGContext *s = ctx->tcg; 1509 int nb_oargs = TCGOP_CALLO(op); 1510 int nb_iargs = TCGOP_CALLI(op); 1511 int flags, i; 1512 1513 init_arguments(ctx, op, nb_oargs + nb_iargs); 1514 copy_propagate(ctx, op, nb_oargs, nb_iargs); 1515 1516 /* If the function reads or writes globals, reset temp data. */ 1517 flags = tcg_call_flags(op); 1518 if (!(flags & (TCG_CALL_NO_READ_GLOBALS | TCG_CALL_NO_WRITE_GLOBALS))) { 1519 int nb_globals = s->nb_globals; 1520 1521 for (i = 0; i < nb_globals; i++) { 1522 if (test_bit(i, ctx->temps_used.l)) { 1523 reset_ts(ctx, &ctx->tcg->temps[i]); 1524 } 1525 } 1526 } 1527 1528 /* If the function has side effects, reset mem data. */ 1529 if (!(flags & TCG_CALL_NO_SIDE_EFFECTS)) { 1530 remove_mem_copy_all(ctx); 1531 } 1532 1533 /* Reset temp data for outputs. */ 1534 for (i = 0; i < nb_oargs; i++) { 1535 reset_temp(ctx, op->args[i]); 1536 } 1537 1538 /* Stop optimizing MB across calls. */ 1539 ctx->prev_mb = NULL; 1540 return true; 1541 } 1542 1543 static bool fold_count_zeros(OptContext *ctx, TCGOp *op) 1544 { 1545 uint64_t z_mask; 1546 1547 if (arg_is_const(op->args[1])) { 1548 uint64_t t = arg_info(op->args[1])->val; 1549 1550 if (t != 0) { 1551 t = do_constant_folding(op->opc, ctx->type, t, 0); 1552 return tcg_opt_gen_movi(ctx, op, op->args[0], t); 1553 } 1554 return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[2]); 1555 } 1556 1557 switch (ctx->type) { 1558 case TCG_TYPE_I32: 1559 z_mask = 31; 1560 break; 1561 case TCG_TYPE_I64: 1562 z_mask = 63; 1563 break; 1564 default: 1565 g_assert_not_reached(); 1566 } 1567 ctx->z_mask = arg_info(op->args[2])->z_mask | z_mask; 1568 ctx->s_mask = smask_from_zmask(ctx->z_mask); 1569 return false; 1570 } 1571 1572 static bool fold_ctpop(OptContext *ctx, TCGOp *op) 1573 { 1574 if (fold_const1(ctx, op)) { 1575 return true; 1576 } 1577 1578 switch (ctx->type) { 1579 case TCG_TYPE_I32: 1580 ctx->z_mask = 32 | 31; 1581 break; 1582 case TCG_TYPE_I64: 1583 ctx->z_mask = 64 | 63; 1584 break; 1585 default: 1586 g_assert_not_reached(); 1587 } 1588 ctx->s_mask = smask_from_zmask(ctx->z_mask); 1589 return false; 1590 } 1591 1592 static bool fold_deposit(OptContext *ctx, TCGOp *op) 1593 { 1594 TCGOpcode and_opc; 1595 1596 if (arg_is_const(op->args[1]) && arg_is_const(op->args[2])) { 1597 uint64_t t1 = arg_info(op->args[1])->val; 1598 uint64_t t2 = arg_info(op->args[2])->val; 1599 1600 t1 = deposit64(t1, op->args[3], op->args[4], t2); 1601 return tcg_opt_gen_movi(ctx, op, op->args[0], t1); 1602 } 1603 1604 switch (ctx->type) { 1605 case TCG_TYPE_I32: 1606 and_opc = INDEX_op_and_i32; 1607 break; 1608 case TCG_TYPE_I64: 1609 and_opc = INDEX_op_and_i64; 1610 break; 1611 default: 1612 g_assert_not_reached(); 1613 } 1614 1615 /* Inserting a value into zero at offset 0. */ 1616 if (arg_is_const_val(op->args[1], 0) && op->args[3] == 0) { 1617 uint64_t mask = MAKE_64BIT_MASK(0, op->args[4]); 1618 1619 op->opc = and_opc; 1620 op->args[1] = op->args[2]; 1621 op->args[2] = arg_new_constant(ctx, mask); 1622 ctx->z_mask = mask & arg_info(op->args[1])->z_mask; 1623 return false; 1624 } 1625 1626 /* Inserting zero into a value. */ 1627 if (arg_is_const_val(op->args[2], 0)) { 1628 uint64_t mask = deposit64(-1, op->args[3], op->args[4], 0); 1629 1630 op->opc = and_opc; 1631 op->args[2] = arg_new_constant(ctx, mask); 1632 ctx->z_mask = mask & arg_info(op->args[1])->z_mask; 1633 return false; 1634 } 1635 1636 ctx->z_mask = deposit64(arg_info(op->args[1])->z_mask, 1637 op->args[3], op->args[4], 1638 arg_info(op->args[2])->z_mask); 1639 return false; 1640 } 1641 1642 static bool fold_divide(OptContext *ctx, TCGOp *op) 1643 { 1644 if (fold_const2(ctx, op) || 1645 fold_xi_to_x(ctx, op, 1)) { 1646 return true; 1647 } 1648 return false; 1649 } 1650 1651 static bool fold_dup(OptContext *ctx, TCGOp *op) 1652 { 1653 if (arg_is_const(op->args[1])) { 1654 uint64_t t = arg_info(op->args[1])->val; 1655 t = dup_const(TCGOP_VECE(op), t); 1656 return tcg_opt_gen_movi(ctx, op, op->args[0], t); 1657 } 1658 return false; 1659 } 1660 1661 static bool fold_dup2(OptContext *ctx, TCGOp *op) 1662 { 1663 if (arg_is_const(op->args[1]) && arg_is_const(op->args[2])) { 1664 uint64_t t = deposit64(arg_info(op->args[1])->val, 32, 32, 1665 arg_info(op->args[2])->val); 1666 return tcg_opt_gen_movi(ctx, op, op->args[0], t); 1667 } 1668 1669 if (args_are_copies(op->args[1], op->args[2])) { 1670 op->opc = INDEX_op_dup_vec; 1671 TCGOP_VECE(op) = MO_32; 1672 } 1673 return false; 1674 } 1675 1676 static bool fold_eqv(OptContext *ctx, TCGOp *op) 1677 { 1678 if (fold_const2_commutative(ctx, op) || 1679 fold_xi_to_x(ctx, op, -1) || 1680 fold_xi_to_not(ctx, op, 0)) { 1681 return true; 1682 } 1683 1684 ctx->s_mask = arg_info(op->args[1])->s_mask 1685 & arg_info(op->args[2])->s_mask; 1686 return false; 1687 } 1688 1689 static bool fold_extract(OptContext *ctx, TCGOp *op) 1690 { 1691 uint64_t z_mask_old, z_mask; 1692 int pos = op->args[2]; 1693 int len = op->args[3]; 1694 1695 if (arg_is_const(op->args[1])) { 1696 uint64_t t; 1697 1698 t = arg_info(op->args[1])->val; 1699 t = extract64(t, pos, len); 1700 return tcg_opt_gen_movi(ctx, op, op->args[0], t); 1701 } 1702 1703 z_mask_old = arg_info(op->args[1])->z_mask; 1704 z_mask = extract64(z_mask_old, pos, len); 1705 if (pos == 0) { 1706 ctx->a_mask = z_mask_old ^ z_mask; 1707 } 1708 ctx->z_mask = z_mask; 1709 ctx->s_mask = smask_from_zmask(z_mask); 1710 1711 return fold_masks(ctx, op); 1712 } 1713 1714 static bool fold_extract2(OptContext *ctx, TCGOp *op) 1715 { 1716 if (arg_is_const(op->args[1]) && arg_is_const(op->args[2])) { 1717 uint64_t v1 = arg_info(op->args[1])->val; 1718 uint64_t v2 = arg_info(op->args[2])->val; 1719 int shr = op->args[3]; 1720 1721 if (op->opc == INDEX_op_extract2_i64) { 1722 v1 >>= shr; 1723 v2 <<= 64 - shr; 1724 } else { 1725 v1 = (uint32_t)v1 >> shr; 1726 v2 = (uint64_t)((int32_t)v2 << (32 - shr)); 1727 } 1728 return tcg_opt_gen_movi(ctx, op, op->args[0], v1 | v2); 1729 } 1730 return false; 1731 } 1732 1733 static bool fold_exts(OptContext *ctx, TCGOp *op) 1734 { 1735 uint64_t s_mask_old, s_mask, z_mask, sign; 1736 bool type_change = false; 1737 1738 if (fold_const1(ctx, op)) { 1739 return true; 1740 } 1741 1742 z_mask = arg_info(op->args[1])->z_mask; 1743 s_mask = arg_info(op->args[1])->s_mask; 1744 s_mask_old = s_mask; 1745 1746 switch (op->opc) { 1747 CASE_OP_32_64(ext8s): 1748 sign = INT8_MIN; 1749 z_mask = (uint8_t)z_mask; 1750 break; 1751 CASE_OP_32_64(ext16s): 1752 sign = INT16_MIN; 1753 z_mask = (uint16_t)z_mask; 1754 break; 1755 case INDEX_op_ext_i32_i64: 1756 type_change = true; 1757 QEMU_FALLTHROUGH; 1758 case INDEX_op_ext32s_i64: 1759 sign = INT32_MIN; 1760 z_mask = (uint32_t)z_mask; 1761 break; 1762 default: 1763 g_assert_not_reached(); 1764 } 1765 1766 if (z_mask & sign) { 1767 z_mask |= sign; 1768 } 1769 s_mask |= sign << 1; 1770 1771 ctx->z_mask = z_mask; 1772 ctx->s_mask = s_mask; 1773 if (!type_change) { 1774 ctx->a_mask = s_mask & ~s_mask_old; 1775 } 1776 1777 return fold_masks(ctx, op); 1778 } 1779 1780 static bool fold_extu(OptContext *ctx, TCGOp *op) 1781 { 1782 uint64_t z_mask_old, z_mask; 1783 bool type_change = false; 1784 1785 if (fold_const1(ctx, op)) { 1786 return true; 1787 } 1788 1789 z_mask_old = z_mask = arg_info(op->args[1])->z_mask; 1790 1791 switch (op->opc) { 1792 CASE_OP_32_64(ext8u): 1793 z_mask = (uint8_t)z_mask; 1794 break; 1795 CASE_OP_32_64(ext16u): 1796 z_mask = (uint16_t)z_mask; 1797 break; 1798 case INDEX_op_extrl_i64_i32: 1799 case INDEX_op_extu_i32_i64: 1800 type_change = true; 1801 QEMU_FALLTHROUGH; 1802 case INDEX_op_ext32u_i64: 1803 z_mask = (uint32_t)z_mask; 1804 break; 1805 case INDEX_op_extrh_i64_i32: 1806 type_change = true; 1807 z_mask >>= 32; 1808 break; 1809 default: 1810 g_assert_not_reached(); 1811 } 1812 1813 ctx->z_mask = z_mask; 1814 ctx->s_mask = smask_from_zmask(z_mask); 1815 if (!type_change) { 1816 ctx->a_mask = z_mask_old ^ z_mask; 1817 } 1818 return fold_masks(ctx, op); 1819 } 1820 1821 static bool fold_mb(OptContext *ctx, TCGOp *op) 1822 { 1823 /* Eliminate duplicate and redundant fence instructions. */ 1824 if (ctx->prev_mb) { 1825 /* 1826 * Merge two barriers of the same type into one, 1827 * or a weaker barrier into a stronger one, 1828 * or two weaker barriers into a stronger one. 1829 * mb X; mb Y => mb X|Y 1830 * mb; strl => mb; st 1831 * ldaq; mb => ld; mb 1832 * ldaq; strl => ld; mb; st 1833 * Other combinations are also merged into a strong 1834 * barrier. This is stricter than specified but for 1835 * the purposes of TCG is better than not optimizing. 1836 */ 1837 ctx->prev_mb->args[0] |= op->args[0]; 1838 tcg_op_remove(ctx->tcg, op); 1839 } else { 1840 ctx->prev_mb = op; 1841 } 1842 return true; 1843 } 1844 1845 static bool fold_mov(OptContext *ctx, TCGOp *op) 1846 { 1847 return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[1]); 1848 } 1849 1850 static bool fold_movcond(OptContext *ctx, TCGOp *op) 1851 { 1852 int i; 1853 1854 /* If true and false values are the same, eliminate the cmp. */ 1855 if (args_are_copies(op->args[3], op->args[4])) { 1856 return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[3]); 1857 } 1858 1859 /* 1860 * Canonicalize the "false" input reg to match the destination reg so 1861 * that the tcg backend can implement a "move if true" operation. 1862 */ 1863 if (swap_commutative(op->args[0], &op->args[4], &op->args[3])) { 1864 op->args[5] = tcg_invert_cond(op->args[5]); 1865 } 1866 1867 i = do_constant_folding_cond1(ctx, op, NO_DEST, &op->args[1], 1868 &op->args[2], &op->args[5]); 1869 if (i >= 0) { 1870 return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[4 - i]); 1871 } 1872 1873 ctx->z_mask = arg_info(op->args[3])->z_mask 1874 | arg_info(op->args[4])->z_mask; 1875 ctx->s_mask = arg_info(op->args[3])->s_mask 1876 & arg_info(op->args[4])->s_mask; 1877 1878 if (arg_is_const(op->args[3]) && arg_is_const(op->args[4])) { 1879 uint64_t tv = arg_info(op->args[3])->val; 1880 uint64_t fv = arg_info(op->args[4])->val; 1881 TCGOpcode opc, negopc = 0; 1882 TCGCond cond = op->args[5]; 1883 1884 switch (ctx->type) { 1885 case TCG_TYPE_I32: 1886 opc = INDEX_op_setcond_i32; 1887 if (TCG_TARGET_HAS_negsetcond_i32) { 1888 negopc = INDEX_op_negsetcond_i32; 1889 } 1890 tv = (int32_t)tv; 1891 fv = (int32_t)fv; 1892 break; 1893 case TCG_TYPE_I64: 1894 opc = INDEX_op_setcond_i64; 1895 if (TCG_TARGET_HAS_negsetcond_i64) { 1896 negopc = INDEX_op_negsetcond_i64; 1897 } 1898 break; 1899 default: 1900 g_assert_not_reached(); 1901 } 1902 1903 if (tv == 1 && fv == 0) { 1904 op->opc = opc; 1905 op->args[3] = cond; 1906 } else if (fv == 1 && tv == 0) { 1907 op->opc = opc; 1908 op->args[3] = tcg_invert_cond(cond); 1909 } else if (negopc) { 1910 if (tv == -1 && fv == 0) { 1911 op->opc = negopc; 1912 op->args[3] = cond; 1913 } else if (fv == -1 && tv == 0) { 1914 op->opc = negopc; 1915 op->args[3] = tcg_invert_cond(cond); 1916 } 1917 } 1918 } 1919 return false; 1920 } 1921 1922 static bool fold_mul(OptContext *ctx, TCGOp *op) 1923 { 1924 if (fold_const2(ctx, op) || 1925 fold_xi_to_i(ctx, op, 0) || 1926 fold_xi_to_x(ctx, op, 1)) { 1927 return true; 1928 } 1929 return false; 1930 } 1931 1932 static bool fold_mul_highpart(OptContext *ctx, TCGOp *op) 1933 { 1934 if (fold_const2_commutative(ctx, op) || 1935 fold_xi_to_i(ctx, op, 0)) { 1936 return true; 1937 } 1938 return false; 1939 } 1940 1941 static bool fold_multiply2(OptContext *ctx, TCGOp *op) 1942 { 1943 swap_commutative(op->args[0], &op->args[2], &op->args[3]); 1944 1945 if (arg_is_const(op->args[2]) && arg_is_const(op->args[3])) { 1946 uint64_t a = arg_info(op->args[2])->val; 1947 uint64_t b = arg_info(op->args[3])->val; 1948 uint64_t h, l; 1949 TCGArg rl, rh; 1950 TCGOp *op2; 1951 1952 switch (op->opc) { 1953 case INDEX_op_mulu2_i32: 1954 l = (uint64_t)(uint32_t)a * (uint32_t)b; 1955 h = (int32_t)(l >> 32); 1956 l = (int32_t)l; 1957 break; 1958 case INDEX_op_muls2_i32: 1959 l = (int64_t)(int32_t)a * (int32_t)b; 1960 h = l >> 32; 1961 l = (int32_t)l; 1962 break; 1963 case INDEX_op_mulu2_i64: 1964 mulu64(&l, &h, a, b); 1965 break; 1966 case INDEX_op_muls2_i64: 1967 muls64(&l, &h, a, b); 1968 break; 1969 default: 1970 g_assert_not_reached(); 1971 } 1972 1973 rl = op->args[0]; 1974 rh = op->args[1]; 1975 1976 /* The proper opcode is supplied by tcg_opt_gen_mov. */ 1977 op2 = tcg_op_insert_before(ctx->tcg, op, 0, 2); 1978 1979 tcg_opt_gen_movi(ctx, op, rl, l); 1980 tcg_opt_gen_movi(ctx, op2, rh, h); 1981 return true; 1982 } 1983 return false; 1984 } 1985 1986 static bool fold_nand(OptContext *ctx, TCGOp *op) 1987 { 1988 if (fold_const2_commutative(ctx, op) || 1989 fold_xi_to_not(ctx, op, -1)) { 1990 return true; 1991 } 1992 1993 ctx->s_mask = arg_info(op->args[1])->s_mask 1994 & arg_info(op->args[2])->s_mask; 1995 return false; 1996 } 1997 1998 static bool fold_neg_no_const(OptContext *ctx, TCGOp *op) 1999 { 2000 /* Set to 1 all bits to the left of the rightmost. */ 2001 uint64_t z_mask = arg_info(op->args[1])->z_mask; 2002 ctx->z_mask = -(z_mask & -z_mask); 2003 2004 /* 2005 * Because of fold_sub_to_neg, we want to always return true, 2006 * via finish_folding. 2007 */ 2008 finish_folding(ctx, op); 2009 return true; 2010 } 2011 2012 static bool fold_neg(OptContext *ctx, TCGOp *op) 2013 { 2014 return fold_const1(ctx, op) || fold_neg_no_const(ctx, op); 2015 } 2016 2017 static bool fold_nor(OptContext *ctx, TCGOp *op) 2018 { 2019 if (fold_const2_commutative(ctx, op) || 2020 fold_xi_to_not(ctx, op, 0)) { 2021 return true; 2022 } 2023 2024 ctx->s_mask = arg_info(op->args[1])->s_mask 2025 & arg_info(op->args[2])->s_mask; 2026 return false; 2027 } 2028 2029 static bool fold_not(OptContext *ctx, TCGOp *op) 2030 { 2031 if (fold_const1(ctx, op)) { 2032 return true; 2033 } 2034 2035 ctx->s_mask = arg_info(op->args[1])->s_mask; 2036 2037 /* Because of fold_to_not, we want to always return true, via finish. */ 2038 finish_folding(ctx, op); 2039 return true; 2040 } 2041 2042 static bool fold_or(OptContext *ctx, TCGOp *op) 2043 { 2044 if (fold_const2_commutative(ctx, op) || 2045 fold_xi_to_x(ctx, op, 0) || 2046 fold_xx_to_x(ctx, op)) { 2047 return true; 2048 } 2049 2050 ctx->z_mask = arg_info(op->args[1])->z_mask 2051 | arg_info(op->args[2])->z_mask; 2052 ctx->s_mask = arg_info(op->args[1])->s_mask 2053 & arg_info(op->args[2])->s_mask; 2054 return fold_masks(ctx, op); 2055 } 2056 2057 static bool fold_orc(OptContext *ctx, TCGOp *op) 2058 { 2059 if (fold_const2(ctx, op) || 2060 fold_xx_to_i(ctx, op, -1) || 2061 fold_xi_to_x(ctx, op, -1) || 2062 fold_ix_to_not(ctx, op, 0)) { 2063 return true; 2064 } 2065 2066 ctx->s_mask = arg_info(op->args[1])->s_mask 2067 & arg_info(op->args[2])->s_mask; 2068 return false; 2069 } 2070 2071 static bool fold_qemu_ld(OptContext *ctx, TCGOp *op) 2072 { 2073 const TCGOpDef *def = &tcg_op_defs[op->opc]; 2074 MemOpIdx oi = op->args[def->nb_oargs + def->nb_iargs]; 2075 MemOp mop = get_memop(oi); 2076 int width = 8 * memop_size(mop); 2077 2078 if (width < 64) { 2079 ctx->s_mask = MAKE_64BIT_MASK(width, 64 - width); 2080 if (!(mop & MO_SIGN)) { 2081 ctx->z_mask = MAKE_64BIT_MASK(0, width); 2082 ctx->s_mask <<= 1; 2083 } 2084 } 2085 2086 /* Opcodes that touch guest memory stop the mb optimization. */ 2087 ctx->prev_mb = NULL; 2088 return false; 2089 } 2090 2091 static bool fold_qemu_st(OptContext *ctx, TCGOp *op) 2092 { 2093 /* Opcodes that touch guest memory stop the mb optimization. */ 2094 ctx->prev_mb = NULL; 2095 return false; 2096 } 2097 2098 static bool fold_remainder(OptContext *ctx, TCGOp *op) 2099 { 2100 if (fold_const2(ctx, op) || 2101 fold_xx_to_i(ctx, op, 0)) { 2102 return true; 2103 } 2104 return false; 2105 } 2106 2107 static bool fold_setcond_zmask(OptContext *ctx, TCGOp *op, bool neg) 2108 { 2109 uint64_t a_zmask, b_val; 2110 TCGCond cond; 2111 2112 if (!arg_is_const(op->args[2])) { 2113 return false; 2114 } 2115 2116 a_zmask = arg_info(op->args[1])->z_mask; 2117 b_val = arg_info(op->args[2])->val; 2118 cond = op->args[3]; 2119 2120 if (ctx->type == TCG_TYPE_I32) { 2121 a_zmask = (uint32_t)a_zmask; 2122 b_val = (uint32_t)b_val; 2123 } 2124 2125 /* 2126 * A with only low bits set vs B with high bits set means that A < B. 2127 */ 2128 if (a_zmask < b_val) { 2129 bool inv = false; 2130 2131 switch (cond) { 2132 case TCG_COND_NE: 2133 case TCG_COND_LEU: 2134 case TCG_COND_LTU: 2135 inv = true; 2136 /* fall through */ 2137 case TCG_COND_GTU: 2138 case TCG_COND_GEU: 2139 case TCG_COND_EQ: 2140 return tcg_opt_gen_movi(ctx, op, op->args[0], neg ? -inv : inv); 2141 default: 2142 break; 2143 } 2144 } 2145 2146 /* 2147 * A with only lsb set is already boolean. 2148 */ 2149 if (a_zmask <= 1) { 2150 bool convert = false; 2151 bool inv = false; 2152 2153 switch (cond) { 2154 case TCG_COND_EQ: 2155 inv = true; 2156 /* fall through */ 2157 case TCG_COND_NE: 2158 convert = (b_val == 0); 2159 break; 2160 case TCG_COND_LTU: 2161 case TCG_COND_TSTEQ: 2162 inv = true; 2163 /* fall through */ 2164 case TCG_COND_GEU: 2165 case TCG_COND_TSTNE: 2166 convert = (b_val == 1); 2167 break; 2168 default: 2169 break; 2170 } 2171 if (convert) { 2172 TCGOpcode add_opc, xor_opc, neg_opc; 2173 2174 if (!inv && !neg) { 2175 return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[1]); 2176 } 2177 2178 switch (ctx->type) { 2179 case TCG_TYPE_I32: 2180 add_opc = INDEX_op_add_i32; 2181 neg_opc = INDEX_op_neg_i32; 2182 xor_opc = INDEX_op_xor_i32; 2183 break; 2184 case TCG_TYPE_I64: 2185 add_opc = INDEX_op_add_i64; 2186 neg_opc = INDEX_op_neg_i64; 2187 xor_opc = INDEX_op_xor_i64; 2188 break; 2189 default: 2190 g_assert_not_reached(); 2191 } 2192 2193 if (!inv) { 2194 op->opc = neg_opc; 2195 } else if (neg) { 2196 op->opc = add_opc; 2197 op->args[2] = arg_new_constant(ctx, -1); 2198 } else { 2199 op->opc = xor_opc; 2200 op->args[2] = arg_new_constant(ctx, 1); 2201 } 2202 return false; 2203 } 2204 } 2205 2206 return false; 2207 } 2208 2209 static void fold_setcond_tst_pow2(OptContext *ctx, TCGOp *op, bool neg) 2210 { 2211 TCGOpcode and_opc, sub_opc, xor_opc, neg_opc, shr_opc; 2212 TCGOpcode uext_opc = 0, sext_opc = 0; 2213 TCGCond cond = op->args[3]; 2214 TCGArg ret, src1, src2; 2215 TCGOp *op2; 2216 uint64_t val; 2217 int sh; 2218 bool inv; 2219 2220 if (!is_tst_cond(cond) || !arg_is_const(op->args[2])) { 2221 return; 2222 } 2223 2224 src2 = op->args[2]; 2225 val = arg_info(src2)->val; 2226 if (!is_power_of_2(val)) { 2227 return; 2228 } 2229 sh = ctz64(val); 2230 2231 switch (ctx->type) { 2232 case TCG_TYPE_I32: 2233 and_opc = INDEX_op_and_i32; 2234 sub_opc = INDEX_op_sub_i32; 2235 xor_opc = INDEX_op_xor_i32; 2236 shr_opc = INDEX_op_shr_i32; 2237 neg_opc = INDEX_op_neg_i32; 2238 if (TCG_TARGET_extract_i32_valid(sh, 1)) { 2239 uext_opc = TCG_TARGET_HAS_extract_i32 ? INDEX_op_extract_i32 : 0; 2240 sext_opc = TCG_TARGET_HAS_sextract_i32 ? INDEX_op_sextract_i32 : 0; 2241 } 2242 break; 2243 case TCG_TYPE_I64: 2244 and_opc = INDEX_op_and_i64; 2245 sub_opc = INDEX_op_sub_i64; 2246 xor_opc = INDEX_op_xor_i64; 2247 shr_opc = INDEX_op_shr_i64; 2248 neg_opc = INDEX_op_neg_i64; 2249 if (TCG_TARGET_extract_i64_valid(sh, 1)) { 2250 uext_opc = TCG_TARGET_HAS_extract_i64 ? INDEX_op_extract_i64 : 0; 2251 sext_opc = TCG_TARGET_HAS_sextract_i64 ? INDEX_op_sextract_i64 : 0; 2252 } 2253 break; 2254 default: 2255 g_assert_not_reached(); 2256 } 2257 2258 ret = op->args[0]; 2259 src1 = op->args[1]; 2260 inv = cond == TCG_COND_TSTEQ; 2261 2262 if (sh && sext_opc && neg && !inv) { 2263 op->opc = sext_opc; 2264 op->args[1] = src1; 2265 op->args[2] = sh; 2266 op->args[3] = 1; 2267 return; 2268 } else if (sh && uext_opc) { 2269 op->opc = uext_opc; 2270 op->args[1] = src1; 2271 op->args[2] = sh; 2272 op->args[3] = 1; 2273 } else { 2274 if (sh) { 2275 op2 = tcg_op_insert_before(ctx->tcg, op, shr_opc, 3); 2276 op2->args[0] = ret; 2277 op2->args[1] = src1; 2278 op2->args[2] = arg_new_constant(ctx, sh); 2279 src1 = ret; 2280 } 2281 op->opc = and_opc; 2282 op->args[1] = src1; 2283 op->args[2] = arg_new_constant(ctx, 1); 2284 } 2285 2286 if (neg && inv) { 2287 op2 = tcg_op_insert_after(ctx->tcg, op, sub_opc, 3); 2288 op2->args[0] = ret; 2289 op2->args[1] = ret; 2290 op2->args[2] = arg_new_constant(ctx, 1); 2291 } else if (inv) { 2292 op2 = tcg_op_insert_after(ctx->tcg, op, xor_opc, 3); 2293 op2->args[0] = ret; 2294 op2->args[1] = ret; 2295 op2->args[2] = arg_new_constant(ctx, 1); 2296 } else if (neg) { 2297 op2 = tcg_op_insert_after(ctx->tcg, op, neg_opc, 2); 2298 op2->args[0] = ret; 2299 op2->args[1] = ret; 2300 } 2301 } 2302 2303 static bool fold_setcond(OptContext *ctx, TCGOp *op) 2304 { 2305 int i = do_constant_folding_cond1(ctx, op, op->args[0], &op->args[1], 2306 &op->args[2], &op->args[3]); 2307 if (i >= 0) { 2308 return tcg_opt_gen_movi(ctx, op, op->args[0], i); 2309 } 2310 2311 if (fold_setcond_zmask(ctx, op, false)) { 2312 return true; 2313 } 2314 fold_setcond_tst_pow2(ctx, op, false); 2315 2316 ctx->z_mask = 1; 2317 ctx->s_mask = smask_from_zmask(1); 2318 return false; 2319 } 2320 2321 static bool fold_negsetcond(OptContext *ctx, TCGOp *op) 2322 { 2323 int i = do_constant_folding_cond1(ctx, op, op->args[0], &op->args[1], 2324 &op->args[2], &op->args[3]); 2325 if (i >= 0) { 2326 return tcg_opt_gen_movi(ctx, op, op->args[0], -i); 2327 } 2328 2329 if (fold_setcond_zmask(ctx, op, true)) { 2330 return true; 2331 } 2332 fold_setcond_tst_pow2(ctx, op, true); 2333 2334 /* Value is {0,-1} so all bits are repetitions of the sign. */ 2335 ctx->s_mask = -1; 2336 return false; 2337 } 2338 2339 static bool fold_setcond2(OptContext *ctx, TCGOp *op) 2340 { 2341 TCGCond cond; 2342 int i, inv = 0; 2343 2344 i = do_constant_folding_cond2(ctx, op, &op->args[1]); 2345 cond = op->args[5]; 2346 if (i >= 0) { 2347 goto do_setcond_const; 2348 } 2349 2350 switch (cond) { 2351 case TCG_COND_LT: 2352 case TCG_COND_GE: 2353 /* 2354 * Simplify LT/GE comparisons vs zero to a single compare 2355 * vs the high word of the input. 2356 */ 2357 if (arg_is_const_val(op->args[3], 0) && 2358 arg_is_const_val(op->args[4], 0)) { 2359 goto do_setcond_high; 2360 } 2361 break; 2362 2363 case TCG_COND_NE: 2364 inv = 1; 2365 QEMU_FALLTHROUGH; 2366 case TCG_COND_EQ: 2367 /* 2368 * Simplify EQ/NE comparisons where one of the pairs 2369 * can be simplified. 2370 */ 2371 i = do_constant_folding_cond(TCG_TYPE_I32, op->args[1], 2372 op->args[3], cond); 2373 switch (i ^ inv) { 2374 case 0: 2375 goto do_setcond_const; 2376 case 1: 2377 goto do_setcond_high; 2378 } 2379 2380 i = do_constant_folding_cond(TCG_TYPE_I32, op->args[2], 2381 op->args[4], cond); 2382 switch (i ^ inv) { 2383 case 0: 2384 goto do_setcond_const; 2385 case 1: 2386 goto do_setcond_low; 2387 } 2388 break; 2389 2390 case TCG_COND_TSTEQ: 2391 case TCG_COND_TSTNE: 2392 if (arg_is_const_val(op->args[3], 0)) { 2393 goto do_setcond_high; 2394 } 2395 if (arg_is_const_val(op->args[4], 0)) { 2396 goto do_setcond_low; 2397 } 2398 break; 2399 2400 default: 2401 break; 2402 2403 do_setcond_low: 2404 op->args[2] = op->args[3]; 2405 op->args[3] = cond; 2406 op->opc = INDEX_op_setcond_i32; 2407 return fold_setcond(ctx, op); 2408 2409 do_setcond_high: 2410 op->args[1] = op->args[2]; 2411 op->args[2] = op->args[4]; 2412 op->args[3] = cond; 2413 op->opc = INDEX_op_setcond_i32; 2414 return fold_setcond(ctx, op); 2415 } 2416 2417 ctx->z_mask = 1; 2418 ctx->s_mask = smask_from_zmask(1); 2419 return false; 2420 2421 do_setcond_const: 2422 return tcg_opt_gen_movi(ctx, op, op->args[0], i); 2423 } 2424 2425 static bool fold_cmp_vec(OptContext *ctx, TCGOp *op) 2426 { 2427 /* Canonicalize the comparison to put immediate second. */ 2428 if (swap_commutative(NO_DEST, &op->args[1], &op->args[2])) { 2429 op->args[3] = tcg_swap_cond(op->args[3]); 2430 } 2431 return false; 2432 } 2433 2434 static bool fold_cmpsel_vec(OptContext *ctx, TCGOp *op) 2435 { 2436 /* If true and false values are the same, eliminate the cmp. */ 2437 if (args_are_copies(op->args[3], op->args[4])) { 2438 return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[3]); 2439 } 2440 2441 /* Canonicalize the comparison to put immediate second. */ 2442 if (swap_commutative(NO_DEST, &op->args[1], &op->args[2])) { 2443 op->args[5] = tcg_swap_cond(op->args[5]); 2444 } 2445 /* 2446 * Canonicalize the "false" input reg to match the destination, 2447 * so that the tcg backend can implement "move if true". 2448 */ 2449 if (swap_commutative(op->args[0], &op->args[4], &op->args[3])) { 2450 op->args[5] = tcg_invert_cond(op->args[5]); 2451 } 2452 return false; 2453 } 2454 2455 static bool fold_sextract(OptContext *ctx, TCGOp *op) 2456 { 2457 uint64_t z_mask, s_mask, s_mask_old; 2458 int pos = op->args[2]; 2459 int len = op->args[3]; 2460 2461 if (arg_is_const(op->args[1])) { 2462 uint64_t t; 2463 2464 t = arg_info(op->args[1])->val; 2465 t = sextract64(t, pos, len); 2466 return tcg_opt_gen_movi(ctx, op, op->args[0], t); 2467 } 2468 2469 z_mask = arg_info(op->args[1])->z_mask; 2470 z_mask = sextract64(z_mask, pos, len); 2471 ctx->z_mask = z_mask; 2472 2473 s_mask_old = arg_info(op->args[1])->s_mask; 2474 s_mask = sextract64(s_mask_old, pos, len); 2475 s_mask |= MAKE_64BIT_MASK(len, 64 - len); 2476 ctx->s_mask = s_mask; 2477 2478 if (pos == 0) { 2479 ctx->a_mask = s_mask & ~s_mask_old; 2480 } 2481 2482 return fold_masks(ctx, op); 2483 } 2484 2485 static bool fold_shift(OptContext *ctx, TCGOp *op) 2486 { 2487 uint64_t s_mask, z_mask, sign; 2488 2489 if (fold_const2(ctx, op) || 2490 fold_ix_to_i(ctx, op, 0) || 2491 fold_xi_to_x(ctx, op, 0)) { 2492 return true; 2493 } 2494 2495 s_mask = arg_info(op->args[1])->s_mask; 2496 z_mask = arg_info(op->args[1])->z_mask; 2497 2498 if (arg_is_const(op->args[2])) { 2499 int sh = arg_info(op->args[2])->val; 2500 2501 ctx->z_mask = do_constant_folding(op->opc, ctx->type, z_mask, sh); 2502 2503 s_mask = do_constant_folding(op->opc, ctx->type, s_mask, sh); 2504 ctx->s_mask = smask_from_smask(s_mask); 2505 2506 return fold_masks(ctx, op); 2507 } 2508 2509 switch (op->opc) { 2510 CASE_OP_32_64(sar): 2511 /* 2512 * Arithmetic right shift will not reduce the number of 2513 * input sign repetitions. 2514 */ 2515 ctx->s_mask = s_mask; 2516 break; 2517 CASE_OP_32_64(shr): 2518 /* 2519 * If the sign bit is known zero, then logical right shift 2520 * will not reduced the number of input sign repetitions. 2521 */ 2522 sign = (s_mask & -s_mask) >> 1; 2523 if (sign && !(z_mask & sign)) { 2524 ctx->s_mask = s_mask; 2525 } 2526 break; 2527 default: 2528 break; 2529 } 2530 2531 return false; 2532 } 2533 2534 static bool fold_sub_to_neg(OptContext *ctx, TCGOp *op) 2535 { 2536 TCGOpcode neg_op; 2537 bool have_neg; 2538 2539 if (!arg_is_const(op->args[1]) || arg_info(op->args[1])->val != 0) { 2540 return false; 2541 } 2542 2543 switch (ctx->type) { 2544 case TCG_TYPE_I32: 2545 neg_op = INDEX_op_neg_i32; 2546 have_neg = true; 2547 break; 2548 case TCG_TYPE_I64: 2549 neg_op = INDEX_op_neg_i64; 2550 have_neg = true; 2551 break; 2552 case TCG_TYPE_V64: 2553 case TCG_TYPE_V128: 2554 case TCG_TYPE_V256: 2555 neg_op = INDEX_op_neg_vec; 2556 have_neg = (TCG_TARGET_HAS_neg_vec && 2557 tcg_can_emit_vec_op(neg_op, ctx->type, TCGOP_VECE(op)) > 0); 2558 break; 2559 default: 2560 g_assert_not_reached(); 2561 } 2562 if (have_neg) { 2563 op->opc = neg_op; 2564 op->args[1] = op->args[2]; 2565 return fold_neg_no_const(ctx, op); 2566 } 2567 return false; 2568 } 2569 2570 /* We cannot as yet do_constant_folding with vectors. */ 2571 static bool fold_sub_vec(OptContext *ctx, TCGOp *op) 2572 { 2573 if (fold_xx_to_i(ctx, op, 0) || 2574 fold_xi_to_x(ctx, op, 0) || 2575 fold_sub_to_neg(ctx, op)) { 2576 return true; 2577 } 2578 return false; 2579 } 2580 2581 static bool fold_sub(OptContext *ctx, TCGOp *op) 2582 { 2583 if (fold_const2(ctx, op) || fold_sub_vec(ctx, op)) { 2584 return true; 2585 } 2586 2587 /* Fold sub r,x,i to add r,x,-i */ 2588 if (arg_is_const(op->args[2])) { 2589 uint64_t val = arg_info(op->args[2])->val; 2590 2591 op->opc = (ctx->type == TCG_TYPE_I32 2592 ? INDEX_op_add_i32 : INDEX_op_add_i64); 2593 op->args[2] = arg_new_constant(ctx, -val); 2594 } 2595 return false; 2596 } 2597 2598 static bool fold_sub2(OptContext *ctx, TCGOp *op) 2599 { 2600 return fold_addsub2(ctx, op, false); 2601 } 2602 2603 static bool fold_tcg_ld(OptContext *ctx, TCGOp *op) 2604 { 2605 /* We can't do any folding with a load, but we can record bits. */ 2606 switch (op->opc) { 2607 CASE_OP_32_64(ld8s): 2608 ctx->s_mask = MAKE_64BIT_MASK(8, 56); 2609 break; 2610 CASE_OP_32_64(ld8u): 2611 ctx->z_mask = MAKE_64BIT_MASK(0, 8); 2612 ctx->s_mask = MAKE_64BIT_MASK(9, 55); 2613 break; 2614 CASE_OP_32_64(ld16s): 2615 ctx->s_mask = MAKE_64BIT_MASK(16, 48); 2616 break; 2617 CASE_OP_32_64(ld16u): 2618 ctx->z_mask = MAKE_64BIT_MASK(0, 16); 2619 ctx->s_mask = MAKE_64BIT_MASK(17, 47); 2620 break; 2621 case INDEX_op_ld32s_i64: 2622 ctx->s_mask = MAKE_64BIT_MASK(32, 32); 2623 break; 2624 case INDEX_op_ld32u_i64: 2625 ctx->z_mask = MAKE_64BIT_MASK(0, 32); 2626 ctx->s_mask = MAKE_64BIT_MASK(33, 31); 2627 break; 2628 default: 2629 g_assert_not_reached(); 2630 } 2631 return false; 2632 } 2633 2634 static bool fold_tcg_ld_memcopy(OptContext *ctx, TCGOp *op) 2635 { 2636 TCGTemp *dst, *src; 2637 intptr_t ofs; 2638 TCGType type; 2639 2640 if (op->args[1] != tcgv_ptr_arg(tcg_env)) { 2641 return false; 2642 } 2643 2644 type = ctx->type; 2645 ofs = op->args[2]; 2646 dst = arg_temp(op->args[0]); 2647 src = find_mem_copy_for(ctx, type, ofs); 2648 if (src && src->base_type == type) { 2649 return tcg_opt_gen_mov(ctx, op, temp_arg(dst), temp_arg(src)); 2650 } 2651 2652 reset_ts(ctx, dst); 2653 record_mem_copy(ctx, type, dst, ofs, ofs + tcg_type_size(type) - 1); 2654 return true; 2655 } 2656 2657 static bool fold_tcg_st(OptContext *ctx, TCGOp *op) 2658 { 2659 intptr_t ofs = op->args[2]; 2660 intptr_t lm1; 2661 2662 if (op->args[1] != tcgv_ptr_arg(tcg_env)) { 2663 remove_mem_copy_all(ctx); 2664 return false; 2665 } 2666 2667 switch (op->opc) { 2668 CASE_OP_32_64(st8): 2669 lm1 = 0; 2670 break; 2671 CASE_OP_32_64(st16): 2672 lm1 = 1; 2673 break; 2674 case INDEX_op_st32_i64: 2675 case INDEX_op_st_i32: 2676 lm1 = 3; 2677 break; 2678 case INDEX_op_st_i64: 2679 lm1 = 7; 2680 break; 2681 case INDEX_op_st_vec: 2682 lm1 = tcg_type_size(ctx->type) - 1; 2683 break; 2684 default: 2685 g_assert_not_reached(); 2686 } 2687 remove_mem_copy_in(ctx, ofs, ofs + lm1); 2688 return false; 2689 } 2690 2691 static bool fold_tcg_st_memcopy(OptContext *ctx, TCGOp *op) 2692 { 2693 TCGTemp *src; 2694 intptr_t ofs, last; 2695 TCGType type; 2696 2697 if (op->args[1] != tcgv_ptr_arg(tcg_env)) { 2698 fold_tcg_st(ctx, op); 2699 return false; 2700 } 2701 2702 src = arg_temp(op->args[0]); 2703 ofs = op->args[2]; 2704 type = ctx->type; 2705 2706 /* 2707 * Eliminate duplicate stores of a constant. 2708 * This happens frequently when the target ISA zero-extends. 2709 */ 2710 if (ts_is_const(src)) { 2711 TCGTemp *prev = find_mem_copy_for(ctx, type, ofs); 2712 if (src == prev) { 2713 tcg_op_remove(ctx->tcg, op); 2714 return true; 2715 } 2716 } 2717 2718 last = ofs + tcg_type_size(type) - 1; 2719 remove_mem_copy_in(ctx, ofs, last); 2720 record_mem_copy(ctx, type, src, ofs, last); 2721 return false; 2722 } 2723 2724 static bool fold_xor(OptContext *ctx, TCGOp *op) 2725 { 2726 if (fold_const2_commutative(ctx, op) || 2727 fold_xx_to_i(ctx, op, 0) || 2728 fold_xi_to_x(ctx, op, 0) || 2729 fold_xi_to_not(ctx, op, -1)) { 2730 return true; 2731 } 2732 2733 ctx->z_mask = arg_info(op->args[1])->z_mask 2734 | arg_info(op->args[2])->z_mask; 2735 ctx->s_mask = arg_info(op->args[1])->s_mask 2736 & arg_info(op->args[2])->s_mask; 2737 return fold_masks(ctx, op); 2738 } 2739 2740 static bool fold_bitsel_vec(OptContext *ctx, TCGOp *op) 2741 { 2742 /* If true and false values are the same, eliminate the cmp. */ 2743 if (args_are_copies(op->args[2], op->args[3])) { 2744 return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[2]); 2745 } 2746 2747 if (arg_is_const(op->args[2]) && arg_is_const(op->args[3])) { 2748 uint64_t tv = arg_info(op->args[2])->val; 2749 uint64_t fv = arg_info(op->args[3])->val; 2750 2751 if (tv == -1 && fv == 0) { 2752 return tcg_opt_gen_mov(ctx, op, op->args[0], op->args[1]); 2753 } 2754 if (tv == 0 && fv == -1) { 2755 if (TCG_TARGET_HAS_not_vec) { 2756 op->opc = INDEX_op_not_vec; 2757 return fold_not(ctx, op); 2758 } else { 2759 op->opc = INDEX_op_xor_vec; 2760 op->args[2] = arg_new_constant(ctx, -1); 2761 return fold_xor(ctx, op); 2762 } 2763 } 2764 } 2765 if (arg_is_const(op->args[2])) { 2766 uint64_t tv = arg_info(op->args[2])->val; 2767 if (tv == -1) { 2768 op->opc = INDEX_op_or_vec; 2769 op->args[2] = op->args[3]; 2770 return fold_or(ctx, op); 2771 } 2772 if (tv == 0 && TCG_TARGET_HAS_andc_vec) { 2773 op->opc = INDEX_op_andc_vec; 2774 op->args[2] = op->args[1]; 2775 op->args[1] = op->args[3]; 2776 return fold_andc(ctx, op); 2777 } 2778 } 2779 if (arg_is_const(op->args[3])) { 2780 uint64_t fv = arg_info(op->args[3])->val; 2781 if (fv == 0) { 2782 op->opc = INDEX_op_and_vec; 2783 return fold_and(ctx, op); 2784 } 2785 if (fv == -1 && TCG_TARGET_HAS_orc_vec) { 2786 op->opc = INDEX_op_orc_vec; 2787 op->args[2] = op->args[1]; 2788 op->args[1] = op->args[3]; 2789 return fold_orc(ctx, op); 2790 } 2791 } 2792 return false; 2793 } 2794 2795 /* Propagate constants and copies, fold constant expressions. */ 2796 void tcg_optimize(TCGContext *s) 2797 { 2798 int nb_temps, i; 2799 TCGOp *op, *op_next; 2800 OptContext ctx = { .tcg = s }; 2801 2802 QSIMPLEQ_INIT(&ctx.mem_free); 2803 2804 /* Array VALS has an element for each temp. 2805 If this temp holds a constant then its value is kept in VALS' element. 2806 If this temp is a copy of other ones then the other copies are 2807 available through the doubly linked circular list. */ 2808 2809 nb_temps = s->nb_temps; 2810 for (i = 0; i < nb_temps; ++i) { 2811 s->temps[i].state_ptr = NULL; 2812 } 2813 2814 QTAILQ_FOREACH_SAFE(op, &s->ops, link, op_next) { 2815 TCGOpcode opc = op->opc; 2816 const TCGOpDef *def; 2817 bool done = false; 2818 2819 /* Calls are special. */ 2820 if (opc == INDEX_op_call) { 2821 fold_call(&ctx, op); 2822 continue; 2823 } 2824 2825 def = &tcg_op_defs[opc]; 2826 init_arguments(&ctx, op, def->nb_oargs + def->nb_iargs); 2827 copy_propagate(&ctx, op, def->nb_oargs, def->nb_iargs); 2828 2829 /* Pre-compute the type of the operation. */ 2830 if (def->flags & TCG_OPF_VECTOR) { 2831 ctx.type = TCG_TYPE_V64 + TCGOP_VECL(op); 2832 } else if (def->flags & TCG_OPF_64BIT) { 2833 ctx.type = TCG_TYPE_I64; 2834 } else { 2835 ctx.type = TCG_TYPE_I32; 2836 } 2837 2838 /* Assume all bits affected, no bits known zero, no sign reps. */ 2839 ctx.a_mask = -1; 2840 ctx.z_mask = -1; 2841 ctx.s_mask = 0; 2842 2843 /* 2844 * Process each opcode. 2845 * Sorted alphabetically by opcode as much as possible. 2846 */ 2847 switch (opc) { 2848 CASE_OP_32_64(add): 2849 done = fold_add(&ctx, op); 2850 break; 2851 case INDEX_op_add_vec: 2852 done = fold_add_vec(&ctx, op); 2853 break; 2854 CASE_OP_32_64(add2): 2855 done = fold_add2(&ctx, op); 2856 break; 2857 CASE_OP_32_64_VEC(and): 2858 done = fold_and(&ctx, op); 2859 break; 2860 CASE_OP_32_64_VEC(andc): 2861 done = fold_andc(&ctx, op); 2862 break; 2863 CASE_OP_32_64(brcond): 2864 done = fold_brcond(&ctx, op); 2865 break; 2866 case INDEX_op_brcond2_i32: 2867 done = fold_brcond2(&ctx, op); 2868 break; 2869 CASE_OP_32_64(bswap16): 2870 CASE_OP_32_64(bswap32): 2871 case INDEX_op_bswap64_i64: 2872 done = fold_bswap(&ctx, op); 2873 break; 2874 CASE_OP_32_64(clz): 2875 CASE_OP_32_64(ctz): 2876 done = fold_count_zeros(&ctx, op); 2877 break; 2878 CASE_OP_32_64(ctpop): 2879 done = fold_ctpop(&ctx, op); 2880 break; 2881 CASE_OP_32_64(deposit): 2882 done = fold_deposit(&ctx, op); 2883 break; 2884 CASE_OP_32_64(div): 2885 CASE_OP_32_64(divu): 2886 done = fold_divide(&ctx, op); 2887 break; 2888 case INDEX_op_dup_vec: 2889 done = fold_dup(&ctx, op); 2890 break; 2891 case INDEX_op_dup2_vec: 2892 done = fold_dup2(&ctx, op); 2893 break; 2894 CASE_OP_32_64_VEC(eqv): 2895 done = fold_eqv(&ctx, op); 2896 break; 2897 CASE_OP_32_64(extract): 2898 done = fold_extract(&ctx, op); 2899 break; 2900 CASE_OP_32_64(extract2): 2901 done = fold_extract2(&ctx, op); 2902 break; 2903 CASE_OP_32_64(ext8s): 2904 CASE_OP_32_64(ext16s): 2905 case INDEX_op_ext32s_i64: 2906 case INDEX_op_ext_i32_i64: 2907 done = fold_exts(&ctx, op); 2908 break; 2909 CASE_OP_32_64(ext8u): 2910 CASE_OP_32_64(ext16u): 2911 case INDEX_op_ext32u_i64: 2912 case INDEX_op_extu_i32_i64: 2913 case INDEX_op_extrl_i64_i32: 2914 case INDEX_op_extrh_i64_i32: 2915 done = fold_extu(&ctx, op); 2916 break; 2917 CASE_OP_32_64(ld8s): 2918 CASE_OP_32_64(ld8u): 2919 CASE_OP_32_64(ld16s): 2920 CASE_OP_32_64(ld16u): 2921 case INDEX_op_ld32s_i64: 2922 case INDEX_op_ld32u_i64: 2923 done = fold_tcg_ld(&ctx, op); 2924 break; 2925 case INDEX_op_ld_i32: 2926 case INDEX_op_ld_i64: 2927 case INDEX_op_ld_vec: 2928 done = fold_tcg_ld_memcopy(&ctx, op); 2929 break; 2930 CASE_OP_32_64(st8): 2931 CASE_OP_32_64(st16): 2932 case INDEX_op_st32_i64: 2933 done = fold_tcg_st(&ctx, op); 2934 break; 2935 case INDEX_op_st_i32: 2936 case INDEX_op_st_i64: 2937 case INDEX_op_st_vec: 2938 done = fold_tcg_st_memcopy(&ctx, op); 2939 break; 2940 case INDEX_op_mb: 2941 done = fold_mb(&ctx, op); 2942 break; 2943 CASE_OP_32_64_VEC(mov): 2944 done = fold_mov(&ctx, op); 2945 break; 2946 CASE_OP_32_64(movcond): 2947 done = fold_movcond(&ctx, op); 2948 break; 2949 CASE_OP_32_64(mul): 2950 done = fold_mul(&ctx, op); 2951 break; 2952 CASE_OP_32_64(mulsh): 2953 CASE_OP_32_64(muluh): 2954 done = fold_mul_highpart(&ctx, op); 2955 break; 2956 CASE_OP_32_64(muls2): 2957 CASE_OP_32_64(mulu2): 2958 done = fold_multiply2(&ctx, op); 2959 break; 2960 CASE_OP_32_64_VEC(nand): 2961 done = fold_nand(&ctx, op); 2962 break; 2963 CASE_OP_32_64(neg): 2964 done = fold_neg(&ctx, op); 2965 break; 2966 CASE_OP_32_64_VEC(nor): 2967 done = fold_nor(&ctx, op); 2968 break; 2969 CASE_OP_32_64_VEC(not): 2970 done = fold_not(&ctx, op); 2971 break; 2972 CASE_OP_32_64_VEC(or): 2973 done = fold_or(&ctx, op); 2974 break; 2975 CASE_OP_32_64_VEC(orc): 2976 done = fold_orc(&ctx, op); 2977 break; 2978 case INDEX_op_qemu_ld_a32_i32: 2979 case INDEX_op_qemu_ld_a64_i32: 2980 case INDEX_op_qemu_ld_a32_i64: 2981 case INDEX_op_qemu_ld_a64_i64: 2982 case INDEX_op_qemu_ld_a32_i128: 2983 case INDEX_op_qemu_ld_a64_i128: 2984 done = fold_qemu_ld(&ctx, op); 2985 break; 2986 case INDEX_op_qemu_st8_a32_i32: 2987 case INDEX_op_qemu_st8_a64_i32: 2988 case INDEX_op_qemu_st_a32_i32: 2989 case INDEX_op_qemu_st_a64_i32: 2990 case INDEX_op_qemu_st_a32_i64: 2991 case INDEX_op_qemu_st_a64_i64: 2992 case INDEX_op_qemu_st_a32_i128: 2993 case INDEX_op_qemu_st_a64_i128: 2994 done = fold_qemu_st(&ctx, op); 2995 break; 2996 CASE_OP_32_64(rem): 2997 CASE_OP_32_64(remu): 2998 done = fold_remainder(&ctx, op); 2999 break; 3000 CASE_OP_32_64(rotl): 3001 CASE_OP_32_64(rotr): 3002 CASE_OP_32_64(sar): 3003 CASE_OP_32_64(shl): 3004 CASE_OP_32_64(shr): 3005 done = fold_shift(&ctx, op); 3006 break; 3007 CASE_OP_32_64(setcond): 3008 done = fold_setcond(&ctx, op); 3009 break; 3010 CASE_OP_32_64(negsetcond): 3011 done = fold_negsetcond(&ctx, op); 3012 break; 3013 case INDEX_op_setcond2_i32: 3014 done = fold_setcond2(&ctx, op); 3015 break; 3016 case INDEX_op_cmp_vec: 3017 done = fold_cmp_vec(&ctx, op); 3018 break; 3019 case INDEX_op_cmpsel_vec: 3020 done = fold_cmpsel_vec(&ctx, op); 3021 break; 3022 case INDEX_op_bitsel_vec: 3023 done = fold_bitsel_vec(&ctx, op); 3024 break; 3025 CASE_OP_32_64(sextract): 3026 done = fold_sextract(&ctx, op); 3027 break; 3028 CASE_OP_32_64(sub): 3029 done = fold_sub(&ctx, op); 3030 break; 3031 case INDEX_op_sub_vec: 3032 done = fold_sub_vec(&ctx, op); 3033 break; 3034 CASE_OP_32_64(sub2): 3035 done = fold_sub2(&ctx, op); 3036 break; 3037 CASE_OP_32_64_VEC(xor): 3038 done = fold_xor(&ctx, op); 3039 break; 3040 default: 3041 break; 3042 } 3043 3044 if (!done) { 3045 finish_folding(&ctx, op); 3046 } 3047 } 3048 } 3049