mirrors/bitcoin
1
0
Fork 0
mirror of https://github.com/bitcoin/bitcoin.git synced 2025-02-22 15:04:44 +01:00
Code Issues Projects Releases Wiki Activity

[Refactor] CPU feature detection logic for SHA256

Browse source
This commit is contained in:
Pieter Wuille 2018-06-24 10:44:02 -07:00
parent b1dc39df6e
commit 268400d318
1 changed files with 34 additions and 16 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

50
src/crypto/sha256.cpp
View file

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