https://issues.dlang.org/show_bug.cgi?id=8047
--- Comment #4 from Marco Leise <marco.le...@gmx.de> --- //PMOVMSKB = 0x660FD7, has been commented out in core.simd. We may as well comment out all instructions returning non-XMM values until this is resolved. The ones I could find so far are: COMISD COMISS CVTSD2SI CVTSS2SI CVTTPD2PI CVTTPS2PI CVTTSD2SI CVTTSS2SI MASKMOVDQU MASKMOVQ MOVMSKPD MOVMSKPS PCMPESTRI PCMPISTRI PMOVMSKB PTEST UCOMISS UCOMISD CRC32, POPCNT and LZCNT don't belong in the XMM enum. They were introduced side-by-side with SSE4.2, but don't work on XMM registers and the latter two have their separate CPUID flags. --