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4e5ac8a9a2
If it is possible for the RHS of a shift operation to be greater than or equal to the bit-width, then the result might be undef, and we can't report any known bits. In some cases, this was allowing a transformation in instcombine which widened an undef value from i1 to i32, increasing the range of values that a function could return. Differential revision: https://reviews.llvm.org/D30781 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@297724 91177308-0d34-0410-b5e6-96231b3b80d8 |
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