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af6be11a60
We assumed that negation operations of the form (0 - %Z) resulted in a negative number. This isn't true if %Z was originally negative. Substituting the negative number into the remainder operation may result in undefined behavior because the dividend might be INT_MIN. This fixes PR21256. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219639 91177308-0d34-0410-b5e6-96231b3b80d8
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