Fix gcc.dg/vect/bb-slp-subgroups-2.c with 256bit vectors

The following adds vect128, vect256 and vect512 effective targets
and adjusts gcc.dg/vect/bb-slp-subgroups-2.c accordingly.

gcc/testsuite/
	* lib/target-supports.exp: Add vect128, vect256 and vect512
	effective targets.
	* gcc.dg/vect/bb-slp-subgroups-2.c: Properly handle the
	vect256 case.

1 files changed, 18 insertions, 0 deletions

diff --git a/gcc/testsuite/lib/target-supports.exp b/gcc/testsuite/lib/target-supports.exp
index 5b5f865..d4623ee 100644
--- a/gcc/testsuite/lib/target-supports.exp
+++ b/gcc/testsuite/lib/target-supports.exp
@@ -8634,6 +8634,24 @@ proc check_effective_target_vect_variable_length { } {
     return [expr { [lindex [available_vector_sizes] 0] == 0 }]
 }
 
+# Return 1 if the target supports vectors of 512 bits.
+
+proc check_effective_target_vect512 { } {
+    return [expr { [lsearch -exact [available_vector_sizes] 512] >= 0 }]
+}
+
+# Return 1 if the target supports vectors of 256 bits.
+
+proc check_effective_target_vect256 { } {
+    return [expr { [lsearch -exact [available_vector_sizes] 256] >= 0 }]
+}
+
+# Return 1 if the target supports vectors of 128 bits.
+
+proc check_effective_target_vect128 { } {
+    return [expr { [lsearch -exact [available_vector_sizes] 128] >= 0 }]
+}
+
 # Return 1 if the target supports vectors of 64 bits.
 
 proc check_effective_target_vect64 { } {