https://issues.dlang.org/show_bug.cgi?id=16098
--- Comment #3 from Vladimir Panteleev <dlang-bugzi...@thecybershadow.net> --- Well, this is annoying. Broken code: align(16) uint[128] state; asm { fxsave state; } "Fixed" code: uint[128 + 4] buf; auto state = cast(uint*)((cast(size_t)buf.ptr + 0xF) & ~size_t(0xF)); version (X86_64) asm { mov RAX, state; fxsave 0[RAX]; } else asm { mov EAX, state; fxsave 0[EAX]; } --