diff options
Diffstat (limited to 'llvm/lib/Support/Host.cpp')
| -rw-r--r-- | llvm/lib/Support/Host.cpp | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/llvm/lib/Support/Host.cpp b/llvm/lib/Support/Host.cpp index 386446c76a0..7e07b8f7ca2 100644 --- a/llvm/lib/Support/Host.cpp +++ b/llvm/lib/Support/Host.cpp @@ -1027,7 +1027,15 @@ static void getAvailableFeatures(unsigned ECX, unsigned EDX, unsigned MaxLeaf, const unsigned AVXBits = (1 << 27) | (1 << 28); bool HasAVX = ((ECX & AVXBits) == AVXBits) && !getX86XCR0(&EAX, &EDX) && ((EAX & 0x6) == 0x6); +#if defined(__APPLE__) + // Darwin lazily saves the AVX512 context on first use: trust that the OS will + // save the AVX512 context if we use AVX512 instructions, even the bit is not + // set right now. + bool HasAVX512Save = true; +#else + // AVX512 requires additional context to be saved by the OS. bool HasAVX512Save = HasAVX && ((EAX & 0xe0) == 0xe0); +#endif if (HasAVX) setFeature(X86::FEATURE_AVX); @@ -1364,8 +1372,15 @@ bool sys::getHostCPUFeatures(StringMap<bool> &Features) { // switch, then we have full AVX support. bool HasAVXSave = ((ECX >> 27) & 1) && ((ECX >> 28) & 1) && !getX86XCR0(&EAX, &EDX) && ((EAX & 0x6) == 0x6); +#if defined(__APPLE__) + // Darwin lazily saves the AVX512 context on first use: trust that the OS will + // save the AVX512 context if we use AVX512 instructions, even the bit is not + // set right now. + bool HasAVX512Save = true; +#else // AVX512 requires additional context to be saved by the OS. bool HasAVX512Save = HasAVXSave && ((EAX & 0xe0) == 0xe0); +#endif Features["avx"] = HasAVXSave; Features["fma"] = ((ECX >> 12) & 1) && HasAVXSave; |
