https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107956
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- This should fix it: diff --git a/gcc/tree-vect-patterns.cc b/gcc/tree-vect-patterns.cc index f6c34bb3263..d9fdb24ee62 100644 --- a/gcc/tree-vect-patterns.cc +++ b/gcc/tree-vect-patterns.cc @@ -4964,6 +4964,8 @@ vect_recog_mask_conversion_pattern (vec_info *vinfo, else { lhs = gimple_call_lhs (last_stmt); + if (!lhs) + return NULL; vectype1 = get_vectype_for_scalar_type (vinfo, TREE_TYPE (lhs)); } Though I think it has been a latent bug since r9-1741-g2c58d42c3ed599 really.