testsuite: Adjust vect/bb-slp-subgroups-3.c for VL vectors

Because we disable the cost model, targets with variable-length
vectors can end up vectorising the store to a[0..7] on its own.
With the cost model we do something sensible.

gcc/testsuite/
	* gcc.dg/vect/bb-slp-subgroups-3.c: XFAIL for variable-length vectors.

diff --git a/gcc/testsuite/gcc.dg/vect/bb-slp-subgroups-3.c b/gcc/testsuite/gcc.dg/vect/bb-slp-subgroups-3.c
index fe36f90..e27f956 100644 (file)
--- a/gcc/testsuite/gcc.dg/vect/bb-slp-subgroups-3.c
+++ b/gcc/testsuite/gcc.dg/vect/bb-slp-subgroups-3.c
@@ -38,4 +38,7 @@ main (int argc, char **argv)
 }
 
 /* { dg-final { scan-tree-dump-times "Basic block will be vectorized using SLP" 1 "slp2" } } */
-/* { dg-final { scan-tree-dump-times "optimized: basic block" 2 "slp2" } } */
+/* Because we disable the cost model, targets with variable-length
+   vectors can end up vectorizing the store to a[0..7] on its own.
+   With the cost model we do something sensible.  */
+/* { dg-final { scan-tree-dump-times "optimized: basic block" 2 "slp2" { xfail vect_variable_length } } } */