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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 7a3040dc83 [LCSSA] Post-process PHI-nodes created by SSAUpdate when constructing LCSSA form. 
Summary:
SSAUpdate might insert PHI-nodes inside loops, which can break LCSSA
form unless we fix it up.

This fixes PR28424.

Reviewers: sanjoy, chandlerc, hfinkel

Subscribers: uabelho, llvm-commits

Differential Revision: http://reviews.llvm.org/D21997

llvm-svn: 275883
 2016-07-18 19:05:08 +00:00