[Bug target/127953] missing a constexpr equivalent of __builtinX for _mmX_bslli_X/_mmX_bsrli_X

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127953

--- Comment #3 from Drea Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Gero from comment #2)
> However, shifts using __int128 are not vectorized. But that's exactly the
> point.

Are you sure?

If it is not then file a bug, the x86 backend does promote to use the sse
registers in many cases.