tree-optimization/122110 - do not reject all bit-precision reductions

We can handle bitwise-operation reductions and reductions on mask
vectors just fine.

	PR tree-optimization/122110
	* tree-vect-loop.cc (vectorizable_reduction): Relax restriction
	to mode-precision operations.

diff --git a/gcc/tree-vect-loop.cc b/gcc/tree-vect-loop.cc
index 18360375e2974b8540df4ddf945d7397925d4c54..1d549e4a03e236a76f75e97f66df9016fe0b54fd 100644 (file)
--- a/gcc/tree-vect-loop.cc
+++ b/gcc/tree-vect-loop.cc
@@ -7187,7 +7187,11 @@ vectorizable_reduction (loop_vec_info loop_vinfo,
     return false;
 
   /* Do not try to vectorize bit-precision reductions.  */
-  if (!type_has_mode_precision_p (op.type))
+  if (!VECTOR_BOOLEAN_TYPE_P (vectype_out)
+      && !type_has_mode_precision_p (op.type)
+      && op.code != BIT_AND_EXPR
+      && op.code != BIT_IOR_EXPR
+      && op.code != BIT_XOR_EXPR)
     return false;
 
   /* Lane-reducing ops also never can be used in a SLP reduction group