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Merge #13471: For AVX2 code, also check for AVX, XSAVE, and OS support
32d153fa360f73b4999701b97d55b12318fd2659 For AVX2 code, also check for AVX, XSAVE, and OS support (Pieter Wuille) Pull request description: Fixes #12903. Tree-SHA512: 01e71efb5d3a43c49a145a5b1dc4fe7d0a491e1e78479e7df830a2aaac57c3dcfc316e28984c695206c76f93b68e4350fc037ca36756ca579b7070e39c835da2
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@ -536,6 +536,14 @@ void inline cpuid(uint32_t leaf, uint32_t subleaf, uint32_t& a, uint32_t& b, uin
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{
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__asm__ ("cpuid" : "=a"(a), "=b"(b), "=c"(c), "=d"(d) : "0"(leaf), "2"(subleaf));
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}
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/** Check whether the OS has enabled AVX registers. */
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bool AVXEnabled()
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{
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uint32_t a, d;
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__asm__("xgetbv" : "=a"(a), "=d"(d) : "c"(0));
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return (a & 6) == 6;
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}
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#endif
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} // namespace
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@ -544,6 +552,7 @@ 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__))
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(void)AVXEnabled; // Silence unused warning (in case ENABLE_AVX2 is not defined)
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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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@ -553,10 +562,14 @@ std::string SHA256AutoDetect()
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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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cpuid(7, 0, eax, ebx, ecx, edx);
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if ((ebx >> 5) & 1) {
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TransformD64_8way = sha256d64_avx2::Transform_8way;
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ret += ",avx2(8way)";
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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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