bruno added a subscriber: bruno. ================ Comment at: lib/Headers/cpuid.h:114 @@ -109,2 +113,3 @@ #define bit_AVX 0x10000000 +#define bit_F16C 0x20000000 #define bit_RDRND 0x40000000 ---------------- Isn't this one also meant for gcc compat? https://reviews.llvm.org/D22010