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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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528 // } | 528 // } |
529 class CpuFeatures : public AllStatic { | 529 class CpuFeatures : public AllStatic { |
530 public: | 530 public: |
531 // Detect features of the target CPU. Set safe defaults if the serializer | 531 // Detect features of the target CPU. Set safe defaults if the serializer |
532 // is enabled (snapshots must be portable). | 532 // is enabled (snapshots must be portable). |
533 static void Probe(); | 533 static void Probe(); |
534 | 534 |
535 // Check whether a feature is supported by the target CPU. | 535 // Check whether a feature is supported by the target CPU. |
536 static bool IsSupported(CpuFeature f) { | 536 static bool IsSupported(CpuFeature f) { |
537 ASSERT(initialized_); | 537 ASSERT(initialized_); |
| 538 if (Check(f, cross_compile_)) return true; |
538 if (f == SSE2 && !FLAG_enable_sse2) return false; | 539 if (f == SSE2 && !FLAG_enable_sse2) return false; |
539 if (f == SSE3 && !FLAG_enable_sse3) return false; | 540 if (f == SSE3 && !FLAG_enable_sse3) return false; |
540 if (f == SSE4_1 && !FLAG_enable_sse4_1) return false; | 541 if (f == SSE4_1 && !FLAG_enable_sse4_1) return false; |
541 if (f == CMOV && !FLAG_enable_cmov) return false; | 542 if (f == CMOV && !FLAG_enable_cmov) return false; |
542 return (supported_ & (static_cast<uint64_t>(1) << f)) != 0; | 543 return Check(f, supported_); |
543 } | 544 } |
544 | 545 |
545 static bool IsFoundByRuntimeProbingOnly(CpuFeature f) { | 546 static bool IsFoundByRuntimeProbingOnly(CpuFeature f) { |
546 ASSERT(initialized_); | 547 ASSERT(initialized_); |
547 return (found_by_runtime_probing_only_ & | 548 return Check(f, found_by_runtime_probing_only_); |
548 (static_cast<uint64_t>(1) << f)) != 0; | |
549 } | 549 } |
550 | 550 |
551 static bool IsSafeForSnapshot(CpuFeature f) { | 551 static bool IsSafeForSnapshot(CpuFeature f) { |
552 return (IsSupported(f) && | 552 return Check(f, cross_compile_) || |
| 553 (IsSupported(f) && |
553 (!Serializer::enabled() || !IsFoundByRuntimeProbingOnly(f))); | 554 (!Serializer::enabled() || !IsFoundByRuntimeProbingOnly(f))); |
554 } | 555 } |
555 | 556 |
| 557 static bool VerifyCrossCompiling() { |
| 558 return cross_compile_ == 0; |
| 559 } |
| 560 |
| 561 static bool VerifyCrossCompiling(CpuFeature f) { |
| 562 uint64_t mask = flag2set(f); |
| 563 return cross_compile_ == 0 || |
| 564 (cross_compile_ & mask) == mask; |
| 565 } |
| 566 |
556 private: | 567 private: |
| 568 static bool Check(CpuFeature f, uint64_t set) { |
| 569 return (set & flag2set(f)) != 0; |
| 570 } |
| 571 |
| 572 static uint64_t flag2set(CpuFeature f) { |
| 573 return static_cast<uint64_t>(1) << f; |
| 574 } |
| 575 |
557 #ifdef DEBUG | 576 #ifdef DEBUG |
558 static bool initialized_; | 577 static bool initialized_; |
559 #endif | 578 #endif |
560 static uint64_t supported_; | 579 static uint64_t supported_; |
561 static uint64_t found_by_runtime_probing_only_; | 580 static uint64_t found_by_runtime_probing_only_; |
562 | 581 |
| 582 static uint64_t cross_compile_; |
| 583 |
563 friend class ExternalReference; | 584 friend class ExternalReference; |
564 friend class PlatformFeatureScope; | 585 friend class PlatformFeatureScope; |
565 DISALLOW_COPY_AND_ASSIGN(CpuFeatures); | 586 DISALLOW_COPY_AND_ASSIGN(CpuFeatures); |
566 }; | 587 }; |
567 | 588 |
568 | 589 |
569 class Assembler : public AssemblerBase { | 590 class Assembler : public AssemblerBase { |
570 private: | 591 private: |
571 // We check before assembling an instruction that there is sufficient | 592 // We check before assembling an instruction that there is sufficient |
572 // space to write an instruction and its relocation information. | 593 // space to write an instruction and its relocation information. |
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1235 private: | 1256 private: |
1236 Assembler* assembler_; | 1257 Assembler* assembler_; |
1237 #ifdef DEBUG | 1258 #ifdef DEBUG |
1238 int space_before_; | 1259 int space_before_; |
1239 #endif | 1260 #endif |
1240 }; | 1261 }; |
1241 | 1262 |
1242 } } // namespace v8::internal | 1263 } } // namespace v8::internal |
1243 | 1264 |
1244 #endif // V8_IA32_ASSEMBLER_IA32_H_ | 1265 #endif // V8_IA32_ASSEMBLER_IA32_H_ |
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