[Bug middle-end/91623] [7/8/9 Regression] -msse4.1 -O3 segfault in /usr/lib/gcc/x86_64-pc-linux-gnu/8.3.0/include/smmintrin.h:270:10

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91623

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Marc Glisse from comment #6)
> For the missed constant folding, it seems that we end up in fold_vec_perm,
> with type a vector of "long long", while arg0 and arg1 are vectors of
> "long", and we give up because of the early check "TREE_TYPE (TREE_TYPE
> (arg0)) != TREE_TYPE (type)". I don't know if the check should be relaxed,
> or if the bug is earlier and we shouldn't have reached this place with such
> different types...

It's GENERIC type restrictions vs. GIMPLE ones and folding should be relaxed
here.