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

[jakub at gcc dot gnu.org]

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

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
--- gcc/optabs.c.jj     2019-08-27 12:26:37.392912813 +0200
+++ gcc/optabs.c        2019-08-31 18:00:59.838412487 +0200
@@ -5868,6 +5868,8 @@ expand_vec_cond_expr (tree vec_cond_type
   icode = get_vcond_icode (mode, cmp_op_mode, unsignedp);
   if (icode == CODE_FOR_nothing)
     {
+      if (tcode == LT_EXPR && op0a == op0)
+       tcode = NE_EXPR;
       if (tcode == EQ_EXPR || tcode == NE_EXPR)
        icode = get_vcond_eq_icode (mode, cmp_op_mode);
       if (icode == CODE_FOR_nothing)
fixes this, though perhaps before doing that we should verify op0a is a vector
constant containing just 0s and -1s.
Or for the VECTOR_CST op0 fold it in the expander.