2019-10-16  Richard Biener  <rguenther@suse.de>

	* tree-vect-loop.c (vect_valid_reduction_input_p): Remove.
	(vect_is_simple_reduction): Delay checking to
	vectorizable_reduction and relax the checking.
	(vectorizable_reduction): Check we have a simple use.  Check
	for bogus condition reductions.
	* tree-vect-stmts.c (vect_transform_stmt): Make sure we
	are looking at the last stmt in a pattern sequence when
	filling in backedge PHI values.

	* gcc.dg/vect/vect-cond-reduc-3.c: New testcase.
	* gcc.dg/vect/vect-cond-reduc-4.c: Likewise.

From-SVN: r277067