diff options
| -rw-r--r-- | compiler-rt/lib/builtins/cpu_model.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/compiler-rt/lib/builtins/cpu_model.c b/compiler-rt/lib/builtins/cpu_model.c index cdd632a612b..fb619037d39 100644 --- a/compiler-rt/lib/builtins/cpu_model.c +++ b/compiler-rt/lib/builtins/cpu_model.c @@ -532,7 +532,15 @@ 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(FEATURE_AVX); |
