tree d4991bd6ca864cf98b8ab8bca0c93a2318993501
parent 6568fb5f19a9e48b373889469adf1588701e218f
author Philip Reames <listmail@philipreames.com> 1535587382 +0000
committer Philip Reames <listmail@philipreames.com> 1535587382 +0000

[SimplifyCFG] Fix a cost modeling oversight in branch commoning

The cost modeling was not accounting for the fact we were duplicating the instruction once per predecessor.  With a default threshold of 1, this meant we were actually creating #pred copies.

Adding to the fun, there is *absolutely no* test coverage for this.  Simply bailing for more than one predecessor passes all checked in tests.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@341001 91177308-0d34-0410-b5e6-96231b3b80d8