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Issue 23401002: Fix the CPU feature detection. (Closed) Base URL: https://v8.googlecode.com/svn/branches/bleeding_edge
Patch Set: Improve cpuinfo parsing. Created 7 years, 4 months ago
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1 // Copyright 2012 the V8 project authors. All rights reserved. 1 // Copyright 2012 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without 2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are 3 // modification, are permitted provided that the following conditions are
4 // met: 4 // met:
5 // 5 //
6 // * Redistributions of source code must retain the above copyright 6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer. 7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above 8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following 9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided 10 // disclaimer in the documentation and/or other materials provided
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358 // positions indicated by the members of the CpuFeature enum from globals.h 358 // positions indicated by the members of the CpuFeature enum from globals.h
359 static uint64_t CpuFeaturesImpliedByPlatform(); 359 static uint64_t CpuFeaturesImpliedByPlatform();
360 360
361 // Maximum size of the virtual memory. 0 means there is no artificial 361 // Maximum size of the virtual memory. 0 means there is no artificial
362 // limit. 362 // limit.
363 static intptr_t MaxVirtualMemory(); 363 static intptr_t MaxVirtualMemory();
364 364
365 // Returns the double constant NAN 365 // Returns the double constant NAN
366 static double nan_value(); 366 static double nan_value();
367 367
368 // Support runtime detection of Cpu implementer
369 static CpuImplementer GetCpuImplementer();
370
371 // Support runtime detection of Cpu implementer
372 static CpuPart GetCpuPart(CpuImplementer implementer);
373
374 // Support runtime detection of VFP3 on ARM CPUs.
375 static bool ArmCpuHasFeature(CpuFeature feature);
376
377 // Support runtime detection of whether the hard float option of the 368 // Support runtime detection of whether the hard float option of the
378 // EABI is used. 369 // EABI is used.
379 static bool ArmUsingHardFloat(); 370 static bool ArmUsingHardFloat();
380 371
381 // Support runtime detection of FPU on MIPS CPUs.
382 static bool MipsCpuHasFeature(CpuFeature feature);
383
384 // Returns the activation frame alignment constraint or zero if 372 // Returns the activation frame alignment constraint or zero if
385 // the platform doesn't care. Guaranteed to be a power of two. 373 // the platform doesn't care. Guaranteed to be a power of two.
386 static int ActivationFrameAlignment(); 374 static int ActivationFrameAlignment();
387 375
388 #if defined(V8_TARGET_ARCH_IA32) 376 #if defined(V8_TARGET_ARCH_IA32)
389 // Limit below which the extra overhead of the MemCopy function is likely 377 // Limit below which the extra overhead of the MemCopy function is likely
390 // to outweigh the benefits of faster copying. 378 // to outweigh the benefits of faster copying.
391 static const int kMinComplexMemCopy = 64; 379 static const int kMinComplexMemCopy = 64;
392 380
393 // Copy memory area. No restrictions. 381 // Copy memory area. No restrictions.
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817 static uint16_t HToN(uint16_t value); 805 static uint16_t HToN(uint16_t value);
818 static uint16_t NToH(uint16_t value); 806 static uint16_t NToH(uint16_t value);
819 static uint32_t HToN(uint32_t value); 807 static uint32_t HToN(uint32_t value);
820 static uint32_t NToH(uint32_t value); 808 static uint32_t NToH(uint32_t value);
821 }; 809 };
822 810
823 811
824 } } // namespace v8::internal 812 } } // namespace v8::internal
825 813
826 #endif // V8_PLATFORM_H_ 814 #endif // V8_PLATFORM_H_
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