87 lines
2.3 KiB
C++
87 lines
2.3 KiB
C++
// WTFPL
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#include <cstring>
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// Fixes #473
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#ifdef WIN32
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#include <intrin.h>
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#endif
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#include "CpuID.h"
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namespace spades {
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#if defined(__i386__) || defined(_M_IX86) || defined(__amd64__) || defined(__x86_64__)
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static std::array<uint32_t, 4> cpuid(uint32_t a) {
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std::array<uint32_t, 4> regs;
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#ifdef WIN32
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__cpuid(reinterpret_cast<int *>(regs.data()), a);
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#elif defined(__i386__) && (defined(__pic__) || defined(__PIC__))
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asm volatile("mov %%ebx, %%edi\ncpuid\nxchg %%edi, %%ebx\n"
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: "=a"(regs[0]), "=D"(regs[1]), "=c"(regs[2]), "=d"(regs[2])
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: "a"(a), "c"(0));
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#else
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asm volatile("cpuid"
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: "=a"(regs[0]), "=b"(regs[1]), "=c"(regs[2]), "=d"(regs[3])
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: "a"(a), "c"(0));
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#endif
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return regs;
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}
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CpuID::CpuID() {
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uint32_t maxStdLevel;
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{
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auto ar = cpuid(0);
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char buf[13];
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buf[12] = 0;
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maxStdLevel = ar[0];
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memcpy(buf, ar.data() + 1, 12);
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vendor = buf;
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}
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{
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auto ar = cpuid(1);
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featureEcx = ar[2];
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featureEdx = ar[3];
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}
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{
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if (cpuid(0x80000000U)[0] >= 0x80000004U) {
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char buf[49];
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buf[48] = 0;
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memcpy(buf, cpuid(0x80000002U).data(), 16);
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memcpy(buf + 16, cpuid(0x80000003U).data(), 16);
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memcpy(buf + 32, cpuid(0x80000004U).data(), 16);
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brand = buf;
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} else {
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brand = "Unknown";
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}
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}
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{
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auto ar = cpuid(7);
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// FIXME: sublevels?
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subfeature = ar[1];
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}
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{ info = "(none)"; }
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}
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bool CpuID::Supports(spades::CpuFeature feature) {
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switch (feature) {
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case CpuFeature::MMX: return featureEdx & (1U << 23);
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case CpuFeature::SSE: return featureEdx & (1U << 25);
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case CpuFeature::SSE2: return featureEdx & (1U << 26);
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case CpuFeature::SSE3: return featureEcx & (1U << 0);
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case CpuFeature::SSSE3: return featureEcx & (1U << 9);
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case CpuFeature::FMA: return featureEcx & (1U << 12);
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case CpuFeature::AVX: return featureEcx & (1U << 28);
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case CpuFeature::AVX2: return subfeature & (1U << 5);
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case CpuFeature::AVX512CD: return subfeature & (1U << 28);
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case CpuFeature::AVX512ER: return subfeature & (1U << 27);
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case CpuFeature::AVX512PF: return subfeature & (1U << 26);
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case CpuFeature::AVX512F: return subfeature & (1U << 16);
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case CpuFeature::SimultaneousMT: return featureEdx & (1U << 28);
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}
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}
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#endif
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}
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