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69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
/*
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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 "zutil.h"
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#ifdef _MSC_VER
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#include <intrin.h>
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#else
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// Newer versions of GCC and clang come with cpuid.h
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#include <cpuid.h>
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#endif
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ZLIB_INTERNAL int x86_cpu_has_sse2;
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ZLIB_INTERNAL int x86_cpu_has_sse42;
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ZLIB_INTERNAL int x86_cpu_has_pclmulqdq;
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ZLIB_INTERNAL int x86_cpu_has_tzcnt;
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static void cpuid(int info, unsigned* eax, unsigned* ebx, unsigned* ecx, unsigned* edx) {
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#ifdef _MSC_VER
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unsigned int registers[4];
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__cpuid(registers, info);
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*eax = registers[0];
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*ebx = registers[1];
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*ecx = registers[2];
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*edx = registers[3];
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#else
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unsigned int _eax;
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unsigned int _ebx;
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unsigned int _ecx;
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unsigned int _edx;
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__cpuid(info, _eax, _ebx, _ecx, _edx);
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*eax = _eax;
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*ebx = _ebx;
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*ecx = _ecx;
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*edx = _edx;
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#endif
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}
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void ZLIB_INTERNAL x86_check_features(void) {
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unsigned eax, ebx, ecx, edx;
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unsigned maxbasic;
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cpuid(0, &maxbasic, &ebx, &ecx, &edx);
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cpuid(1 /*CPU_PROCINFO_AND_FEATUREBITS*/, &eax, &ebx, &ecx, &edx);
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x86_cpu_has_sse2 = edx & 0x4000000;
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x86_cpu_has_sse42 = ecx & 0x100000;
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x86_cpu_has_pclmulqdq = ecx & 0x2;
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if (maxbasic >= 7) {
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cpuid(7, &eax, &ebx, &ecx, &edx);
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// check BMI1 bit
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// Reference: https://software.intel.com/sites/default/files/article/405250/how-to-detect-new-instruction-support-in-the-4th-generation-intel-core-processor-family.pdf
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x86_cpu_has_tzcnt = ebx & 0x8;
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} else {
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x86_cpu_has_tzcnt = 0;
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}
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}
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