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Fix PR77282

Message ID alpine.LSU.2.11.1608181204460.26629@t29.fhfr.qr
State New
Headers show

Commit Message

Richard Biener Aug. 18, 2016, 10:05 a.m. UTC 
The following fixes PR77282, tested on x86_64-unknown-linux-gnu, applied
as obvious.

Richard.

2016-08-18  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/77282
	* tree-ssa-pre.c (eliminate_dom_walker::before_dom_children):
	When doing auto-parallelizing also prevent use of PHIs that
	carry dependences across loop backedges.
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Patch

Index: gcc/tree-ssa-pre.c
===================================================================
--- gcc/tree-ssa-pre.c	(revision 239564)
+++ gcc/tree-ssa-pre.c	(working copy)
@@ -4270,7 +4270,7 @@  eliminate_dom_walker::before_dom_childre
 	  if (sprime
 	      && TREE_CODE (sprime) == SSA_NAME
 	      && do_pre
-	      && flag_tree_loop_vectorize
+	      && (flag_tree_loop_vectorize || flag_tree_parallelize_loops)
 	      && loop_outer (b->loop_father)
 	      && has_zero_uses (sprime)
 	      && bitmap_bit_p (inserted_exprs, SSA_NAME_VERSION (sprime))