[PATCH 1/2] Relax vect_check_scalar_mask check

[Richard Biener]

When the mask is not a constant or external def there's no need to
check the scalar type, in particular with SLP and the mask being
a VEC_PERM_EXPR there isn't a scalar operand ready to check
(not one vect_is_simple_use will get you).  We later check the
vector type and reject non-mask types there.

Bootstrapped and tested on x86_64-unknown-linux-gnu.

	* tree-vect-stmts.cc (vect_check_scalar_mask): Only check
	the scalar type for constant or extern defs.
---
 gcc/tree-vect-stmts.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gcc/tree-vect-stmts.cc b/gcc/tree-vect-stmts.cc
index cca6fd6fa97..55f263620c5 100644
--- a/gcc/tree-vect-stmts.cc
+++ b/gcc/tree-vect-stmts.cc
@@ -2520,7 +2520,8 @@ vect_check_scalar_mask (vec_info *vinfo, stmt_vec_info stmt_info,
       return false;
     }
 
-  if (!VECT_SCALAR_BOOLEAN_TYPE_P (TREE_TYPE (*mask)))
+  if ((mask_dt == vect_constant_def || mask_dt == vect_external_def)
+      && !VECT_SCALAR_BOOLEAN_TYPE_P (TREE_TYPE (*mask)))
     {
       if (dump_enabled_p ())
 	dump_printf_loc (MSG_MISSED_OPTIMIZATION, vect_location,
-- 
2.43.0