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r226075 | sanjoy | 2015-01-14 17:46:09 -0800 (Wed, 14 Jan 2015) | 10 lines
Fix PR22222
The bug was introduced in r225282. r225282 assumed that sub X, Y is
the same as add X, -Y. This is not correct if we are going to upgrade
the sub to sub nuw. This change fixes the issue by making the
optimization ignore sub instructions.
Differential Revision: http://reviews.llvm.org/D6979
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_36@226193 91177308-0d34-0410-b5e6-96231b3b80d8
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