[Refactor] CPU feature detection logic for SHA256
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1 changed files with 34 additions and 16 deletions
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@ -552,32 +552,50 @@ std::string SHA256AutoDetect()
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{
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std::string ret = "standard";
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#if defined(USE_ASM) && (defined(__x86_64__) || defined(__amd64__) || defined(__i386__))
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(void)AVXEnabled; // Silence unused warning (in case ENABLE_AVX2 is not defined)
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bool have_sse4 = false;
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bool have_xsave = false;
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bool have_avx = false;
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bool have_avx2 = false;
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bool enabled_avx = false;
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(void)AVXEnabled;
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(void)have_sse4;
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(void)have_avx;
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(void)have_xsave;
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(void)have_avx2;
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(void)enabled_avx;
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uint32_t eax, ebx, ecx, edx;
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cpuid(1, 0, eax, ebx, ecx, edx);
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if ((ecx >> 19) & 1) {
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have_sse4 = (ecx >> 19) & 1;
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have_xsave = (ecx >> 27) & 1;
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have_avx = (ecx >> 28) & 1;
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if (have_xsave && have_avx) {
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enabled_avx = AVXEnabled();
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}
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if (have_sse4) {
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cpuid(7, 0, eax, ebx, ecx, edx);
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have_avx2 = (ebx >> 5) & 1;
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}
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if (have_sse4) {
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#if defined(__x86_64__) || defined(__amd64__)
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Transform = sha256_sse4::Transform;
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TransformD64 = TransformD64Wrapper<sha256_sse4::Transform>;
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ret = "sse4(1way)";
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#endif
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#if defined(ENABLE_SSE41) && !defined(BUILD_BITCOIN_INTERNAL)
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TransformD64_4way = sha256d64_sse41::Transform_4way;
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ret = "sse4(1way+4way)";
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#if defined(ENABLE_AVX2) && !defined(BUILD_BITCOIN_INTERNAL)
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if (((ecx >> 27) & 1) && ((ecx >> 28) & 1)) { // XSAVE and AVX
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cpuid(7, 0, eax, ebx, ecx, edx);
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if ((ebx >> 5) & 1) { // AVX2 flag
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if (AVXEnabled()) { // OS has enabled AVX registers
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TransformD64_8way = sha256d64_avx2::Transform_8way;
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ret += ",avx2(8way)";
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}
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}
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}
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#endif
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#else
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ret = "sse4";
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ret += ",sse41(4way)";
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#endif
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}
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#if defined(ENABLE_AVX2) && !defined(BUILD_BITCOIN_INTERNAL)
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if (have_avx2 && have_avx && enabled_avx) {
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TransformD64_8way = sha256d64_avx2::Transform_8way;
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ret += ",avx2(8way)";
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}
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#endif
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#endif
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assert(SelfTest());
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