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102 lines
2.5 KiB
C
102 lines
2.5 KiB
C
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/*
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* x86 feature check
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*
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* Copyright (C) 2013 Intel Corporation. All rights reserved.
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* Author:
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* Jim Kukunas
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*
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* For conditions of distribution and use, see copyright notice in zlib.h
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*/
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#include "x86.h"
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#include "zutil.h"
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int ZLIB_INTERNAL x86_cpu_enable_ssse3 = 0;
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int ZLIB_INTERNAL x86_cpu_enable_simd = 0;
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#ifndef _MSC_VER
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#include <pthread.h>
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pthread_once_t cpu_check_inited_once = PTHREAD_ONCE_INIT;
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static void _x86_check_features(void);
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void x86_check_features(void)
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{
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pthread_once(&cpu_check_inited_once, _x86_check_features);
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}
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static void _x86_check_features(void)
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{
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int x86_cpu_has_sse2;
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int x86_cpu_has_ssse3;
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int x86_cpu_has_sse42;
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int x86_cpu_has_pclmulqdq;
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unsigned eax, ebx, ecx, edx;
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eax = 1;
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#ifdef __i386__
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__asm__ __volatile__ (
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"xchg %%ebx, %1\n\t"
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"cpuid\n\t"
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"xchg %1, %%ebx\n\t"
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: "+a" (eax), "=S" (ebx), "=c" (ecx), "=d" (edx)
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);
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#else
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__asm__ __volatile__ (
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"cpuid\n\t"
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: "+a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx)
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);
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#endif /* (__i386__) */
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x86_cpu_has_sse2 = edx & 0x4000000;
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x86_cpu_has_ssse3 = ecx & 0x000200;
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x86_cpu_has_sse42 = ecx & 0x100000;
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x86_cpu_has_pclmulqdq = ecx & 0x2;
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x86_cpu_enable_ssse3 = x86_cpu_has_ssse3;
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x86_cpu_enable_simd = x86_cpu_has_sse2 &&
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x86_cpu_has_sse42 &&
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x86_cpu_has_pclmulqdq;
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}
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#else
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#include <intrin.h>
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#include <windows.h>
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static BOOL CALLBACK _x86_check_features(PINIT_ONCE once,
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PVOID param,
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PVOID *context);
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static INIT_ONCE cpu_check_inited_once = INIT_ONCE_STATIC_INIT;
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void x86_check_features(void)
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{
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InitOnceExecuteOnce(&cpu_check_inited_once, _x86_check_features,
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NULL, NULL);
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}
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static BOOL CALLBACK _x86_check_features(PINIT_ONCE once,
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PVOID param,
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PVOID *context)
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{
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int x86_cpu_has_sse2;
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int x86_cpu_has_ssse3;
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int x86_cpu_has_sse42;
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int x86_cpu_has_pclmulqdq;
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int regs[4];
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__cpuid(regs, 1);
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x86_cpu_has_sse2 = regs[3] & 0x4000000;
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x86_cpu_has_ssse3 = regs[2] & 0x000200;
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x86_cpu_has_sse42 = regs[2] & 0x100000;
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x86_cpu_has_pclmulqdq = regs[2] & 0x2;
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x86_cpu_enable_ssse3 = x86_cpu_has_ssse3;
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x86_cpu_enable_simd = x86_cpu_has_sse2 &&
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x86_cpu_has_sse42 &&
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x86_cpu_has_pclmulqdq;
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return TRUE;
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}
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#endif /* _MSC_VER */
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