[Bug target/66369] gcc 4.8.3/5.1.0 miss optimisation with vpmovmskb

[marcus.kool at urlfilterdb dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66369

--- Comment #3 from Marcus Kool <marcus.kool at urlfilterdb dot com> ---

> The intrinsic returns "int", and from the above tree dump, the compiler
> won't even consider to combine the sign-extension with vpmovmskb.

That is the core of the issue: the part of gcc that deals with intrinsics does
not consider to use the 64bit version of the vpmovmskb instruction.  

BTW: how is gcc behaving on a system with AVX512 ?