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re PR tree-optimization/77282 (test case gcc.dg/autopar/pr46193.c fails starting with r239414) 

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.

From-SVN: r239565
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Richard Biener 2016-08-18 10:06:03 +00:00 committed by Richard Biener
parent 6cb9849199
commit f9d97e407f
2 changed files with 8 additions and 1 deletions
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gcc/ChangeLog
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@ -1,3 +1,10 @@
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.
2016-08-18  Tamar Christina  <tamar.christina@arm.com>
Ramana Radhakrishnan  <ramana.radhakrishnan@arm.com>

2
gcc/tree-ssa-pre.c
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@ -4270,7 +4270,7 @@ eliminate_dom_walker::before_dom_children (basic_block b)
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))