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Author SHA1 Message Date
Michael Zolotukhin 6bc56d552a Revert "Revert r275883 and r275891. They seem to cause PR28608." 
This reverts commit r276064, and thus reapplies r275891 and r275883 with
a fix for PR28608.

llvm-svn: 276077
 2016-07-20 01:55:27 +00:00
Sean Silva 554efb28d2 Revert r275883 and r275891. They seem to cause PR28608. 
Revert "[LoopSimplify] Update LCSSA after separating nested loops."

This reverts commit r275891.

Revert "[LCSSA] Post-process PHI-nodes created by SSAUpdate when constructing LCSSA form."

This reverts commit r275883.

llvm-svn: 276064
 2016-07-19 23:54:29 +00:00
Michael Zolotukhin ea5b72825b [LoopSimplify] Update LCSSA after separating nested loops. 
Summary:
Usually LCSSA survives this transformation, but in some cases (see
attached test) it doesn't: values from the original loop after
separating might be used from the outer loop. Before the transformation
it was the same loop, so LCSSA phis were not required.

This fixes PR28272.

Reviewers: sanjoy, hfinkel, chandlerc

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D21665

llvm-svn: 275891
 2016-07-18 19:44:19 +00:00