153 lines
4.3 KiB
C
153 lines
4.3 KiB
C
/*
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* The copyright in this software is being made available under the 2-clauses
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* BSD License, included below. This software may be subject to other third
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* party and contributor rights, including patent rights, and no such rights
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* are granted under this license.
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*
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* Copyright (c) 2017, IntoPIX SA <support@intopix.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#define CPUID_SSSE3_ECX_BIT 9
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#define CPUID_OSXSAVE_ECX_BIT 27
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#define CPUID_AVX_ECX_BIT 28
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#define CPUID_AVX2_EBX_BIT 5
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#define CPUID_SSE_EDX_BIT 25
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#define BIT_XMM_STATE (1 << 1)
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#define BIT_YMM_STATE (2 << 1)
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#define REG_EAX 0
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#define REG_EBX 1
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#define REG_ECX 2
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#define REG_EDX 3
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#if defined(__GNUC__) && (defined(__i386__) ||defined(__x86_64))
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#include <cpuid.h>
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#define CPL_CPUID(level, subfunction, array) __cpuid_count(level, subfunction, array[0], array[1], array[2], array[3])
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#elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
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#include <intrin.h>
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#define CPL_CPUID(level, subfunction, array) __cpuidex(array, level, subfunction)
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#else
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#error "not supported"
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#endif
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#if defined(__GNUC__) && (defined(__i386__) ||defined(__x86_64))
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int CPLHaveRuntimeAVX()
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{
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int cpuinfo[4] = { 0, 0, 0, 0 };
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unsigned int nXCRLow;
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unsigned int nXCRHigh;
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CPL_CPUID(1, 0, cpuinfo);
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// Check OSXSAVE feature.
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if ((cpuinfo[REG_ECX] & (1 << CPUID_OSXSAVE_ECX_BIT)) == 0) {
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return 0;
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}
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// Check AVX feature.
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if ((cpuinfo[REG_ECX] & (1 << CPUID_AVX_ECX_BIT)) == 0) {
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return 0;
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}
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// Issue XGETBV and check the XMM and YMM state bit.
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__asm__("xgetbv" : "=a"(nXCRLow), "=d"(nXCRHigh) : "c"(0));
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if ((nXCRLow & (BIT_XMM_STATE | BIT_YMM_STATE)) !=
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(BIT_XMM_STATE | BIT_YMM_STATE)) {
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return 0;
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}
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return 1;
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}
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#elif defined(_MSC_FULL_VER) && (_MSC_FULL_VER >= 160040219) && (defined(_M_IX86) || defined(_M_X64))
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// _xgetbv available only in Visual Studio 2010 SP1 or later
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int CPLHaveRuntimeAVX()
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{
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int cpuinfo[4] = { 0, 0, 0, 0 };
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unsigned __int64 xcrFeatureMask;
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CPL_CPUID(1, 0, cpuinfo);
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// Check OSXSAVE feature.
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if ((cpuinfo[REG_ECX] & (1 << CPUID_OSXSAVE_ECX_BIT)) == 0) {
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return 0;
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}
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// Check AVX feature.
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if ((cpuinfo[REG_ECX] & (1 << CPUID_AVX_ECX_BIT)) == 0) {
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return 0;
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}
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// Issue XGETBV and check the XMM and YMM state bit.
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xcrFeatureMask = _xgetbv(_XCR_XFEATURE_ENABLED_MASK);
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if ((xcrFeatureMask & (BIT_XMM_STATE | BIT_YMM_STATE)) !=
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(BIT_XMM_STATE | BIT_YMM_STATE)) {
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return 0;
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}
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return 1;
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}
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#endif
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int CPLHaveRuntimeAVX2()
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{
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int cpuinfo[4] = { 0, 0, 0, 0 };
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if (!CPLHaveRuntimeAVX()) {
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return 0;
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}
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CPL_CPUID(7, 0, cpuinfo);
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// Check AVX2 feature.
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if ((cpuinfo[REG_EBX] & (1 << CPUID_AVX2_EBX_BIT)) == 0) {
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return 0;
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}
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return 1;
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}
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int main()
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{
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if (CPLHaveRuntimeAVX2()) {
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return 0;
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}
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return 1;
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}
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