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4 Commits

Author SHA1 Message Date
Chandler Carruth d50c5fb13f [PM] Teach LoopDeletion to correctly update the LPM when loops are 
deleted.

I've expanded its test coverage a bit including adding one test that
will crash clearly without this change.

llvm-svn: 292332
 2017-01-18 02:41:26 +00:00
Chandler Carruth 88c36d7852 [LoopDeletion] (cleanup, NFC) Make this test actually test what it 
claims to test.

LoopSimplify was unifying the multiple exits in this test case, making
it never even test the multiple exit handling of LoopDeletion. Doh.

Now it works (thanks to a great idea from mkuper) and will fail if we
ever change something to make it stop working.

llvm-svn: 292331
 2017-01-18 02:29:35 +00:00
Sanjoy Das 7e7a5a050a Use all_of instead of a raw loop; NFC 
Added some tests despite being NFC, since it looks like nothing was
exercising the "all incoming values to exit PHIs are same" logic.

llvm-svn: 268407
 2016-05-03 17:50:06 +00:00
Cameron Zwarich 826308586c Make LoopDeletion work on loops with multiple edges, as long as the incoming 
values from all of the loop's exiting blocks are equal. Patch by Andrew Clinton.

llvm-svn: 126253
 2011-02-22 22:25:39 +00:00