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Commit 70eb5086 authored by Simon Pilgrim's avatar Simon Pilgrim
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[SelectionDAG] ComputeKnownBits - add support for SMIN+SMAX clamp patterns 

If we have a clamp pattern, SMIN(SMAX(X, LO),HI) or SMAX(SMIN(X, HI),LO) then we can deduce that the number of signbits (zeros/ones) will be at least the minimum of the LO and HI constants.

ComputeKnownBits equivalent of D43338.

Differential Revision: https://reviews.llvm.org/D43463

llvm-svn: 325521
parent 4c4a9835
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