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Commit 0e0aebc5 authored by Craig Topper's avatar Craig Topper
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[ValueTracking] Add ComputeNumSignBits support for llvm.abs intrinsic 

If absolute value needs turn a negative number into a positive number it reduces the number of sign bits by at most 1.

Differential Revision: https://reviews.llvm.org/D84971
parent 49660234
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