Fix gcc.dg/vect/bb-slp-pr65935.c FAIL with AVX after recent change

This avoids bigger than V2DF vectorization which disturbs the ability
to consistently check for the vectorization result after us now
also vectorizing the V2DF tail of a V4DF vectorization variant.

2021-09-28  Richard Biener  <rguenther@suse.de>

	* gcc.dg/vect/bb-slp-pr65935.c: Prefer 128bit vectorization
	on x86.

diff --git a/gcc/testsuite/gcc.dg/vect/bb-slp-pr65935.c b/gcc/testsuite/gcc.dg/vect/bb-slp-pr65935.c
index 5d80f56..ee12136 100644 (file)
--- a/gcc/testsuite/gcc.dg/vect/bb-slp-pr65935.c
+++ b/gcc/testsuite/gcc.dg/vect/bb-slp-pr65935.c
@@ -1,5 +1,6 @@
 /* { dg-additional-options "-O3" } */
 /* { dg-require-effective-target vect_double } */
+/* { dg-additional-options "-mprefer-vector-width=128" { target x86_64-*-* i?86-*-* } } */
 
 #include "tree-vect.h"