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Author SHA1 Message Date
Alina Sbirlea b7a3353061 [MemorySSA] Update for partial unswitch. 
Update MSSA for blocks cloned when doing partial unswitching.
Enable additional testing with MSSA.
Resolves PR43641.

llvm-svn: 374850
 2019-10-14 23:52:39 +00:00
Serguei Katkov d000f8b69f [SimpleLoopUnswitch] Don't consider unswitching `switch` insructions with one unique successor 
Only instructions with two or more unique successors should be considered for unswitching.

Patch Author: Daniil Suchkov.

Reviewers: reames, asbirlea, skatkov
Reviewed By: skatkov
Subscribers: hiraditya, llvm-commits
Differential Revision: https://reviews.llvm.org/D64404

llvm-svn: 365611
 2019-07-10 10:25:22 +00:00
Serguei Katkov 97f19f3a49 [SimpleLoopUnswitch] Add a test case exposing a bug 
This test exposes a bug in SimpleLoopUnswitch that leads to a crash on
assert(SuccessorsCount > 1 && "Cannot unswitch a condition without multiple distinct successors!");
when SimpleLoopUnswitch considers unswitching of a loop by a switch with one successor.

Fix will be submitted soon.

Patch Author: Daniil Suchkov.

Reviewers: reames, asbirlea, skatkov
Reviewed By: skatkov
Subscribers: zzheng, llvm-commits
Differential Revision: https://reviews.llvm.org/D64403

llvm-svn: 365600
 2019-07-10 08:25:48 +00:00