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"For signed integers, the determination of overflow of x*y is not so simple. If x and y have the same sign, then overflow occurs iff xy > 2**31 - 1. If they have opposite signs, then overflow occurs iff xy < -2**31." In this case, x == -1. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60278 91177308-0d34-0410-b5e6-96231b3b80d8
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