[Bug tree-optimization/107096] Fully masking vectorization with AVX512 ICEs gcc.dg/vect/vect-over-widen-*.c

[rsandifo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107096

--- Comment #2 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
See the comment above rgroup_controls in tree-vectorizer.h for the
current assumptions around loop predication.  If AVX512 wants something
different then some extensions will be needed :-)