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Author SHA1 Message Date
Alina Sbirlea ad4d018202 Update MemorySSA in LoopRotate. 
Summary:
Teach LoopRotate to preserve MemorySSA.
Enable tests for correctness, dependency disabled by default.

Subscribers: sanjoy, jlebar, Prazek, george.burgess.iv, llvm-commits

Differential Revision: https://reviews.llvm.org/D51718

llvm-svn: 345216
 2018-10-24 22:46:45 +00:00
Max Kazantsev 91f481665e [LoopRotate] Fix incorrect SCEV invalidation in loop rotation 
LoopRotate only invalidates innermost loops while the changes that it makes may
also affert any of this parents. With patch rL329047, SCEV becomes much smarter
about calculation of exit counts for outer loops, so we cannot assume that they are
not affected.

Differential Revision: https://reviews.llvm.org/D45945

llvm-svn: 330582
 2018-04-23 12:33:31 +00:00