re PR target/92758 (r278833 breaks gcc.target/powerpc/fold-vec-splat-floatdouble.c)

2019-12-03  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/92758
	* tree-ssa-forwprop.c (simplify_vector_constructor): Restore
	operation on uniform vectors.

From-SVN: r278938

gcc/ChangeLog

 2019-12-03  Richard Biener  <rguenther@suse.de>
 
+	PR tree-optimization/92758
+	* tree-ssa-forwprop.c (simplify_vector_constructor): Restore
+	operation on uniform vectors.
+
+2019-12-03  Richard Biener  <rguenther@suse.de>
+
 	PR tree-optimization/92645
 	* gimple-fold.c (gimple_fold_builtin_memory_op): Fold memcpy
 	from or to a properly aligned register variable.

gcc/tree-ssa-forwprop.c

@@ -2043,8 +2043,7 @@ simplify_vector_constructor (gimple_stmt_iterator *gsi)
   gcc_checking_assert (TREE_CODE (op) == CONSTRUCTOR
 		       && TREE_CODE (type) == VECTOR_TYPE);
 
-  if (!TYPE_VECTOR_SUBPARTS (type).is_constant (&nelts)
-      || uniform_vector_p (op))
+  if (!TYPE_VECTOR_SUBPARTS (type).is_constant (&nelts))
     return false;
   elem_type = TREE_TYPE (type);
   elem_size = TREE_INT_CST_LOW (TYPE_SIZE (elem_type));