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MageKing17
526076f8ff
Also adds AVX2 autodetection so that AVX2-capable processors will generate AVX2 projects by default. To my surprise, there is actually a noticeable performance increase between AVX and AVX2 builds.
60 lines
1.0 KiB
C++
60 lines
1.0 KiB
C++
// Code snippet from http://stackoverflow.com/a/7495023
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#ifdef _WIN32
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#include <intrin.h>
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// Windows
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#define cpuid __cpuid
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#else
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// GCC Inline Assembly
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void cpuid(int CPUInfo[4],int InfoType){
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__asm__ __volatile__ (
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"cpuid":
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"=a" (CPUInfo[0]),
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"=b" (CPUInfo[1]),
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"=c" (CPUInfo[2]),
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"=d" (CPUInfo[3]) :
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"a" (InfoType)
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);
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}
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#endif
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#include <iostream>
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int main( int argc, char* argv[] )
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{
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int SSE = false;
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int SSE2 = false;
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int AVX = false;
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int AVX2 = false;
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int info[4];
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cpuid(info, 0);
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int nIds = info[0];
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// Detect Instruction Set
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if (nIds >= 1){
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cpuid(info,0x00000001);
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SSE = (info[3] & ((int)1 << 25)) != 0;
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SSE2 = (info[3] & ((int)1 << 26)) != 0;
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AVX = (info[2] & ((int)1 << 28)) != 0;
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}
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if (nIds >= 7){
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cpuid(info,0x00000007);
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AVX2 = (info[1] & ((int)1 << 5)) != 0;
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}
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if (AVX2)
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std::cout << "AVX2";
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else if(AVX)
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std::cout << "AVX";
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else if(SSE2)
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std::cout << "SSE2";
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else if(SSE)
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std::cout << "SSE";
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return 0;
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}
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