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Commit 73a68c25 authored by Simon Pilgrim's avatar Simon Pilgrim
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[InstCombine][SSE] Add DemandedElts support for PSHUFB instructions 

Simplify a pshufb shuffle mask based on the elements of the mask that are actually demanded.

Differential Revision: https://reviews.llvm.org/D28745

llvm-svn: 292101
parent 59d725ca
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