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Author SHA1 Message Date
Eric Christopher cee313d288 Revert "Temporarily Revert "Add basic loop fusion pass."" 
The reversion apparently deleted the test/Transforms directory.

Will be re-reverting again.

llvm-svn: 358552
 2019-04-17 04:52:47 +00:00
Eric Christopher a863435128 Temporarily Revert "Add basic loop fusion pass." 
As it's causing some bot failures (and per request from kbarton).

This reverts commit r358543/ab70da07286e618016e78247e4a24fcb84077fda.

llvm-svn: 358546
 2019-04-17 02:12:23 +00:00
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
Jakub Kuderski b323f4f173 [LoopRotate] Fix DomTree update logic for unreachable nodes. Fix PR33701. 
Summary:
LoopRotate manually updates the DoomTree by iterating over all predecessors of a basic block and computing the Nearest Common Dominator.

When a predecessor happens to be unreachable, `DT.findNearestCommonDominator` returns nullptr.

This patch teaches LoopRotate to handle this case and fixes [[ https://bugs.llvm.org/show_bug.cgi?id=33701 | PR33701 ]].

In the future, LoopRotate should be taught to use the new incremental API for updating the DomTree.

Reviewers: dberlin, davide, uabelho, grosser

Subscribers: efriedma, mzolotukhin

Differential Revision: https://reviews.llvm.org/D35074

llvm-svn: 307828
 2017-07-12 18:42:16 +00:00