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Author SHA1 Message Date
Florian Hahn 189efe295b Recommit "[GVN] Preserve loop related analysis/canonical forms." 
This fixes some pipeline tests.
This reverts commit d0b6f42936.

llvm-svn: 367401
 2019-07-31 09:27:54 +00:00
Florian Hahn d0b6f42936 Revert [GVN] Preserve loop related analysis/canonical forms. 
This reverts r367332 (git commit 2d7227ec3a)

llvm-svn: 367335
 2019-07-30 17:04:58 +00:00
Florian Hahn 2d7227ec3a [GVN] Preserve loop related analysis/canonical forms. 
LoopInfo can be easily preserved by passing it to the functions that
modify the CFG (SplitCriticalEdge and MergeBlockIntoPredecessor.
SplitCriticalEdge also preserves LoopSimplify and LCSSA form when when passing in
LoopInfo. The test case shows that we preserve LoopSimplify and
LoopInfo. Adding addPreservedID(LCSSAID) did not preserve LCSSA for some
reason.

Also I am not sure if it is possible to preserve those in the new pass
manager, as they aren't analysis passes.

Reviewers: reames, hfinkel, davide, jdoerfert

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D65137

llvm-svn: 367332
 2019-07-30 16:43:39 +00:00