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While *most* (X sdiv 1) operations will get caught by InstSimplify, it is still possible for a sdiv to appear in the worklist which hasn't been simplified yet. This means that it is possible for 0 - (X sdiv 1) to get transformed into (X sdiv -1); dividing by -1 can make the transform produce undef values instead of the proper result. Sorry for the lack of testcase, it's a bit problematic because it relies on the exact order of operations in the worklist. llvm-svn: 215818 |
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