| author | Sanjoy Das <sanjoy@playingwithpointers.com> | |
| Thu, 15 Jan 2015 01:46:09 +0000 (01:46 +0000) | ||
| committer | Sanjoy Das <sanjoy@playingwithpointers.com> | |
| Thu, 15 Jan 2015 01:46:09 +0000 (01:46 +0000) | ||
| commit | 7ec1829823276e4e20648bc13b40567bf39d4e03 | |
| tree | f33602276beec1e0c363004fceb8a43ed95ea194 | tree | snapshot (tar.xz tar.gz zip) |
| parent | 5a40bef7979813149432fba5f6f287f2eb7dc5a2 | commit | diff |
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
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226075 91177308-0d34-0410-b5e6-96231b3b80d8
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
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226075 91177308-0d34-0410-b5e6-96231b3b80d8
| lib/Transforms/Utils/SimplifyIndVar.cpp | diff | blob | history | |
| test/Transforms/IndVarSimplify/pr22222.ll | [new file with mode: 0644] | blob |
| test/Transforms/IndVarSimplify/strengthen-overflow.ll | diff | blob | history |