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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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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 CpuFeatureScope before use. | 445 // Supported features must be enabled by a CpuFeatureScope before use. |
446 // Example: | 446 // Example: |
447 // if (assembler->IsSupported(SSE3)) { | 447 // if (assembler->IsSupported(SSE3)) { |
448 // CpuFeatureScope fscope(assembler, 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 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; | |
463 if (f == SSE3 && !FLAG_enable_sse3) return false; | 462 if (f == SSE3 && !FLAG_enable_sse3) return false; |
464 if (f == SSE4_1 && !FLAG_enable_sse4_1) return false; | 463 if (f == SSE4_1 && !FLAG_enable_sse4_1) return false; |
465 if (f == CMOV && !FLAG_enable_cmov) return false; | 464 if (f == CMOV && !FLAG_enable_cmov) return false; |
466 if (f == RDTSC && !FLAG_enable_rdtsc) return false; | 465 if (f == RDTSC && !FLAG_enable_rdtsc) return false; |
467 if (f == SAHF && !FLAG_enable_sahf) return false; | 466 if (f == SAHF && !FLAG_enable_sahf) return false; |
468 return (supported_ & (static_cast<uint64_t>(1) << f)) != 0; | 467 return (supported_ & (static_cast<uint64_t>(1) << f)) != 0; |
469 } | 468 } |
470 | 469 |
471 static bool IsFoundByRuntimeProbingOnly(CpuFeature f) { | 470 static bool IsFoundByRuntimeProbingOnly(CpuFeature f) { |
472 ASSERT(initialized_); | 471 ASSERT(initialized_); |
473 return (found_by_runtime_probing_only_ & | 472 return (found_by_runtime_probing_only_ & |
474 (static_cast<uint64_t>(1) << f)) != 0; | 473 (static_cast<uint64_t>(1) << f)) != 0; |
475 } | 474 } |
476 | 475 |
477 static bool IsSafeForSnapshot(CpuFeature f) { | 476 static bool IsSafeForSnapshot(CpuFeature f) { |
478 return (IsSupported(f) && | 477 return (IsSupported(f) && |
479 (!Serializer::enabled() || !IsFoundByRuntimeProbingOnly(f))); | 478 (!Serializer::enabled() || !IsFoundByRuntimeProbingOnly(f))); |
480 } | 479 } |
481 | 480 |
482 private: | 481 private: |
483 // Safe defaults include SSE2 and CMOV for X64. It is always available, if | 482 // Safe defaults include CMOV for X64. It is always available, if |
484 // anyone checks, but they shouldn't need to check. | 483 // anyone checks, but they shouldn't need to check. |
485 // The required user mode extensions in X64 are (from AMD64 ABI Table A.1): | 484 // The required user mode extensions in X64 are (from AMD64 ABI Table A.1): |
486 // fpu, tsc, cx8, cmov, mmx, sse, sse2, fxsr, syscall | 485 // fpu, tsc, cx8, cmov, mmx, sse, sse2, fxsr, syscall |
487 static const uint64_t kDefaultCpuFeatures = (1 << SSE2 | 1 << CMOV); | 486 static const uint64_t kDefaultCpuFeatures = (1 << CMOV); |
488 | 487 |
489 #ifdef DEBUG | 488 #ifdef DEBUG |
490 static bool initialized_; | 489 static bool initialized_; |
491 #endif | 490 #endif |
492 static uint64_t supported_; | 491 static uint64_t supported_; |
493 static uint64_t found_by_runtime_probing_only_; | 492 static uint64_t found_by_runtime_probing_only_; |
494 | 493 |
495 friend class ExternalReference; | 494 friend class ExternalReference; |
496 DISALLOW_COPY_AND_ASSIGN(CpuFeatures); | 495 DISALLOW_COPY_AND_ASSIGN(CpuFeatures); |
497 }; | 496 }; |
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1636 private: | 1635 private: |
1637 Assembler* assembler_; | 1636 Assembler* assembler_; |
1638 #ifdef DEBUG | 1637 #ifdef DEBUG |
1639 int space_before_; | 1638 int space_before_; |
1640 #endif | 1639 #endif |
1641 }; | 1640 }; |
1642 | 1641 |
1643 } } // namespace v8::internal | 1642 } } // namespace v8::internal |
1644 | 1643 |
1645 #endif // V8_X64_ASSEMBLER_X64_H_ | 1644 #endif // V8_X64_ASSEMBLER_X64_H_ |
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