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Commit aca8b9d0 authored by Simon Pilgrim's avatar Simon Pilgrim
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[DAG] SimplifyDemandedBits - if we're only demanding the signbits, a MIN/MAX... 

[DAG] SimplifyDemandedBits - if we're only demanding the signbits, a MIN/MAX node can be simplified to a OR or AND node

Extension to the signbit case, if the signbits extend down through all the demanded bits then SMIN/SMAX/UMIN/UMAX nodes can be simplified to a OR/AND/AND/OR.

Alive2: https://alive2.llvm.org/ce/z/mFVFAn (general case)

Differential Revision: https://reviews.llvm.org/D158364
parent 6ef767c0
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