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1 // Copyright (c) 1994-2006 Sun Microsystems Inc. | 1 // Copyright (c) 1994-2006 Sun Microsystems Inc. |
2 // All Rights Reserved. | 2 // All Rights Reserved. |
3 // | 3 // |
4 // Redistribution and use in source and binary forms, with or without | 4 // Redistribution and use in source and binary forms, with or without |
5 // modification, are permitted provided that the following conditions are | 5 // modification, are permitted provided that the following conditions are |
6 // met: | 6 // met: |
7 // | 7 // |
8 // - Redistributions of source code must retain the above copyright notice, | 8 // - Redistributions of source code must retain the above copyright notice, |
9 // this list of conditions and the following disclaimer. | 9 // this list of conditions and the following disclaimer. |
10 // | 10 // |
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435 // Adds operand displacement fields (offsets added to the memory address). | 435 // Adds operand displacement fields (offsets added to the memory address). |
436 // Needs to be called after set_sib, not before it. | 436 // Needs to be called after set_sib, not before it. |
437 inline void set_disp8(int disp); | 437 inline void set_disp8(int disp); |
438 inline void set_disp32(int disp); | 438 inline void set_disp32(int disp); |
439 | 439 |
440 friend class Assembler; | 440 friend class Assembler; |
441 }; | 441 }; |
442 | 442 |
443 | 443 |
444 // CpuFeatures keeps track of which features are supported by the target CPU. | 444 // CpuFeatures keeps track of which features are supported by the target CPU. |
445 // Supported features must be enabled by a Scope before use. | 445 // Supported features must be enabled by a CpuFeatureScope before use. |
446 // Example: | 446 // Example: |
447 // if (CpuFeatures::IsSupported(SSE3)) { | 447 // if (assembler->IsSupported(SSE3)) { |
448 // CpuFeatures::Scope fscope(SSE3); | 448 // CpuFeatureScope fscope(assembler, SSE3); |
449 // // Generate SSE3 floating point code. | 449 // // Generate SSE3 floating point code. |
450 // } else { | 450 // } else { |
451 // // Generate standard x87 or SSE2 floating point code. | 451 // // Generate standard x87 or SSE2 floating point code. |
452 // } | 452 // } |
453 class CpuFeatures : public AllStatic { | 453 class CpuFeatures : public AllStatic { |
454 public: | 454 public: |
455 // Detect features of the target CPU. Set safe defaults if the serializer | 455 // Detect features of the target CPU. Set safe defaults if the serializer |
456 // is enabled (snapshots must be portable). | 456 // is enabled (snapshots must be portable). |
457 static void Probe(); | 457 static void Probe(); |
458 | 458 |
459 // Check whether a feature is supported by the target CPU. | 459 // Check whether a feature is supported by the target CPU. |
460 static bool IsSupported(CpuFeature f) { | 460 static bool IsSupported(CpuFeature f) { |
461 ASSERT(initialized_); | 461 ASSERT(initialized_); |
462 if (f == SSE2 && !FLAG_enable_sse2) return false; | 462 if (f == SSE2 && !FLAG_enable_sse2) return false; |
463 if (f == SSE3 && !FLAG_enable_sse3) return false; | 463 if (f == SSE3 && !FLAG_enable_sse3) return false; |
464 if (f == SSE4_1 && !FLAG_enable_sse4_1) return false; | 464 if (f == SSE4_1 && !FLAG_enable_sse4_1) return false; |
465 if (f == CMOV && !FLAG_enable_cmov) return false; | 465 if (f == CMOV && !FLAG_enable_cmov) return false; |
466 if (f == RDTSC && !FLAG_enable_rdtsc) return false; | 466 if (f == RDTSC && !FLAG_enable_rdtsc) return false; |
467 if (f == SAHF && !FLAG_enable_sahf) return false; | 467 if (f == SAHF && !FLAG_enable_sahf) return false; |
468 return (supported_ & (V8_UINT64_C(1) << f)) != 0; | 468 return (supported_ & (static_cast<uint64_t>(1) << f)) != 0; |
469 } | 469 } |
470 | 470 |
471 #ifdef DEBUG | 471 static bool IsFoundByRuntimeProbingOnly(CpuFeature f) { |
472 // Check whether a feature is currently enabled. | |
473 static bool IsEnabled(CpuFeature f) { | |
474 ASSERT(initialized_); | 472 ASSERT(initialized_); |
475 Isolate* isolate = Isolate::UncheckedCurrent(); | 473 return (found_by_runtime_probing_only_ & |
476 if (isolate == NULL) { | 474 (static_cast<uint64_t>(1) << f)) != 0; |
477 // When no isolate is available, work as if we're running in | |
478 // release mode. | |
479 return IsSupported(f); | |
480 } | |
481 uint64_t enabled = isolate->enabled_cpu_features(); | |
482 return (enabled & (V8_UINT64_C(1) << f)) != 0; | |
483 } | 475 } |
484 #endif | |
485 | |
486 // Enable a specified feature within a scope. | |
487 class Scope BASE_EMBEDDED { | |
488 #ifdef DEBUG | |
489 | |
490 public: | |
491 explicit Scope(CpuFeature f) { | |
492 uint64_t mask = V8_UINT64_C(1) << f; | |
493 ASSERT(CpuFeatures::IsSupported(f)); | |
494 ASSERT(!Serializer::enabled() || | |
495 (CpuFeatures::found_by_runtime_probing_ & mask) == 0); | |
496 isolate_ = Isolate::UncheckedCurrent(); | |
497 old_enabled_ = 0; | |
498 if (isolate_ != NULL) { | |
499 old_enabled_ = isolate_->enabled_cpu_features(); | |
500 isolate_->set_enabled_cpu_features(old_enabled_ | mask); | |
501 } | |
502 } | |
503 ~Scope() { | |
504 ASSERT_EQ(Isolate::UncheckedCurrent(), isolate_); | |
505 if (isolate_ != NULL) { | |
506 isolate_->set_enabled_cpu_features(old_enabled_); | |
507 } | |
508 } | |
509 | |
510 private: | |
511 Isolate* isolate_; | |
512 uint64_t old_enabled_; | |
513 #else | |
514 | |
515 public: | |
516 explicit Scope(CpuFeature f) {} | |
517 #endif | |
518 }; | |
519 | 476 |
520 private: | 477 private: |
521 // Safe defaults include SSE2 and CMOV for X64. It is always available, if | 478 // Safe defaults include SSE2 and CMOV for X64. It is always available, if |
522 // anyone checks, but they shouldn't need to check. | 479 // anyone checks, but they shouldn't need to check. |
523 // The required user mode extensions in X64 are (from AMD64 ABI Table A.1): | 480 // The required user mode extensions in X64 are (from AMD64 ABI Table A.1): |
524 // fpu, tsc, cx8, cmov, mmx, sse, sse2, fxsr, syscall | 481 // fpu, tsc, cx8, cmov, mmx, sse, sse2, fxsr, syscall |
525 static const uint64_t kDefaultCpuFeatures = (1 << SSE2 | 1 << CMOV); | 482 static const uint64_t kDefaultCpuFeatures = (1 << SSE2 | 1 << CMOV); |
526 | 483 |
527 #ifdef DEBUG | 484 #ifdef DEBUG |
528 static bool initialized_; | 485 static bool initialized_; |
529 #endif | 486 #endif |
530 static uint64_t supported_; | 487 static uint64_t supported_; |
531 static uint64_t found_by_runtime_probing_; | 488 static uint64_t found_by_runtime_probing_only_; |
532 | 489 |
533 friend class ExternalReference; | 490 friend class ExternalReference; |
534 DISALLOW_COPY_AND_ASSIGN(CpuFeatures); | 491 DISALLOW_COPY_AND_ASSIGN(CpuFeatures); |
535 }; | 492 }; |
536 | 493 |
537 | 494 |
538 class Assembler : public AssemblerBase { | 495 class Assembler : public AssemblerBase { |
539 private: | 496 private: |
540 // We check before assembling an instruction that there is sufficient | 497 // We check before assembling an instruction that there is sufficient |
541 // space to write an instruction and its relocation information. | 498 // space to write an instruction and its relocation information. |
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1669 private: | 1626 private: |
1670 Assembler* assembler_; | 1627 Assembler* assembler_; |
1671 #ifdef DEBUG | 1628 #ifdef DEBUG |
1672 int space_before_; | 1629 int space_before_; |
1673 #endif | 1630 #endif |
1674 }; | 1631 }; |
1675 | 1632 |
1676 } } // namespace v8::internal | 1633 } } // namespace v8::internal |
1677 | 1634 |
1678 #endif // V8_X64_ASSEMBLER_X64_H_ | 1635 #endif // V8_X64_ASSEMBLER_X64_H_ |
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