commit 0ccd55795bd1e9e54fe45289f41a635c4789614e
author rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4> Mon Sep 16 11:58:35 2019 +0000
committer rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4> Mon Sep 16 11:58:35 2019 +0000
tree e3d30cc89a219df83c072e2c386756aa17aff19d
parent 379b7d4341086073ac09fc1ee617079f46e350bf

2019-09-16  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/91756
	PR tree-optimization/87132
	* tree-ssa-alias.h (enum translate_flags): New.
	(get_continuation_for_phi): Use it instead of simple bool flag.
	(walk_non_aliased_vuses): Likewise.
	* tree-ssa-alias.c (maybe_skip_until): Adjust.
	(get_continuation_for_phi): When looking across backedges only
	disallow valueization.
	(walk_non_aliased_vuses): Adjust.
	* tree-ssa-sccvn.c (vn_reference_lookup_3): Avoid valueization
	if requested.

	* gcc.dg/tree-ssa/ssa-fre-81.c: New testcase.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@275747 138bc75d-0d04-0410-961f-82ee72b054a4