[gcc r16-7036] Fixup gcc.dg/vect/costmodel/x86_64/costmodel-vect-epil-1.c

[Richard Biener]

https://gcc.gnu.org/g:f7454da3346105c972c5bf598263dafe74a7f2e0

commit r16-7036-gf7454da3346105c972c5bf598263dafe74a7f2e0
Author: Richard Biener <rguenther@suse.de>
Date:   Mon Jan 26 09:07:38 2026 +0100

    Fixup gcc.dg/vect/costmodel/x86_64/costmodel-vect-epil-1.c
    
    This makes 512 vector size explicit to avoid FAIL with -march
    that selects a 256 default.
    
            * gcc.dg/vect/costmodel/x86_64/costmodel-vect-epil-1.c: Use
            -mprefer-vector-width=512.

Diff:
---
 gcc/testsuite/gcc.dg/vect/costmodel/x86_64/costmodel-vect-epil-1.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/testsuite/gcc.dg/vect/costmodel/x86_64/costmodel-vect-epil-1.c b/gcc/testsuite/gcc.dg/vect/costmodel/x86_64/costmodel-vect-epil-1.c
index 5b8c358b2a4a..abb9f6681c2e 100644
--- a/gcc/testsuite/gcc.dg/vect/costmodel/x86_64/costmodel-vect-epil-1.c
+++ b/gcc/testsuite/gcc.dg/vect/costmodel/x86_64/costmodel-vect-epil-1.c
@@ -1,5 +1,5 @@
 /* { dg-do compile } */
-/* { dg-additional-options "-mavx512bw -mtune-ctrl=avx512_masked_epilogues" } */
+/* { dg-additional-options "-mavx512bw -mtune-ctrl=avx512_masked_epilogues -mprefer-vector-width=512" } */
 
 void test (const unsigned char * __restrict__ pi,
 	   const float * __restrict__ blk,