[Bug libstdc++/122818] std::experimental::simd miss-optimize mask computation of fixed_size_simd

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122818

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Btw, with OpenMP SIMD there's similar marshalling that we fail to pattern
match.