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| 1 /* | |
| 2 * x86 feature check | |
| 3 * | |
| 4 * Copyright (C) 2013 Intel Corporation. All rights reserved. | |
| 5 * Author: | |
| 6 * Jim Kukunas | |
| 7 * | |
| 8 * For conditions of distribution and use, see copyright notice in zlib.h | |
| 9 */ | |
| 10 | |
| 11 #include "x86.h" | |
| 12 | |
| 13 int x86_cpu_enable_simd; | |
| 14 | |
| 15 #ifndef _MSC_VER | |
| 16 #include <pthread.h> | |
| 17 | |
| 18 pthread_once_t cpu_check_inited_once = PTHREAD_ONCE_INIT; | |
| 19 static void _x86_check_features(void); | |
| 20 | |
| 21 void x86_check_features(void) | |
| 22 { | |
| 23 pthread_once(&cpu_check_inited_once, _x86_check_features); | |
| 24 } | |
| 25 | |
| 26 static void _x86_check_features(void) | |
| 27 { | |
| 28 int x86_cpu_has_sse2; | |
| 29 int x86_cpu_has_sse42; | |
| 30 int x86_cpu_has_pclmulqdq; | |
| 31 unsigned eax, ebx, ecx, edx; | |
| 32 | |
| 33 eax = 1; | |
| 34 #ifdef __i386__ | |
| 35 __asm__ __volatile__ ( | |
| 36 "xchg %%ebx, %1\n\t" | |
| 37 "cpuid\n\t" | |
| 38 "xchg %1, %%ebx\n\t" | |
| 39 : "+a" (eax), "=S" (ebx), "=c" (ecx), "=d" (edx) | |
| 40 ); | |
| 41 #else | |
| 42 __asm__ __volatile__ ( | |
| 43 "cpuid\n\t" | |
| 44 : "+a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx) | |
| 45 ); | |
| 46 #endif /* (__i386__) */ | |
| 47 | |
| 48 x86_cpu_has_sse2 = edx & 0x4000000; | |
| 49 x86_cpu_has_sse42 = ecx & 0x100000; | |
| 50 x86_cpu_has_pclmulqdq = ecx & 0x2; | |
| 51 | |
| 52 x86_cpu_enable_simd = x86_cpu_has_sse2 && | |
| 53 x86_cpu_has_sse42 && | |
| 54 x86_cpu_has_pclmulqdq; | |
| 55 } | |
| 56 #else | |
| 57 #include <intrin.h> | |
| 58 #include <windows.h> | |
| 59 | |
| 60 static BOOL CALLBACK _x86_check_features(PINIT_ONCE once, PVOID param, PVOID *co
ntext); | |
| 61 static INIT_ONCE cpu_check_inited_once = INIT_ONCE_STATIC_INIT; | |
| 62 | |
| 63 void x86_check_features(void) | |
| 64 { | |
| 65 #if (_WIN32_WINNT >= 0x0600) | |
| 66 InitOnceExecuteOnce(&cpu_check_inited_once, _x86_check_features, NULL, NULL)
; | |
| 67 #endif /* (_WIN32_WINNT >= 0x0600) */ | |
| 68 } | |
| 69 | |
| 70 #if (_WIN32_WINNT >= 0x0600) | |
| 71 static BOOL CALLBACK _x86_check_features(PINIT_ONCE once, PVOID param, PVOID *co
ntext) | |
| 72 { | |
| 73 int x86_cpu_has_sse2; | |
| 74 int x86_cpu_has_sse42; | |
| 75 int x86_cpu_has_pclmulqdq; | |
| 76 int regs[4]; | |
| 77 | |
| 78 __cpuid(regs, 1); | |
| 79 | |
| 80 x86_cpu_has_sse2 = regs[3] & 0x4000000; | |
| 81 x86_cpu_has_sse42= regs[2] & 0x100000; | |
| 82 x86_cpu_has_pclmulqdq = regs[2] & 0x2; | |
| 83 | |
| 84 x86_cpu_enable_simd = x86_cpu_has_sse2 && | |
| 85 x86_cpu_has_sse42 && | |
| 86 x86_cpu_has_pclmulqdq; | |
| 87 return TRUE; | |
| 88 } | |
| 89 #endif /* (_WIN32_WINNT >= 0x0600) */ | |
| 90 #endif /* _MSC_VER */ | |
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Chromium Code Reviews
Issue 671163003:
Revert of Integrate SIMD optimisations for zlib (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master