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Commit 51b3b98e authored by Simon Pilgrim's avatar Simon Pilgrim
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[InstCombine][SSE] Add DemandedElts support for PACKSS/PACKUS instructions 

Simplify a packss/packus truncation based on the elements of the mask that are actually demanded.

Differential Revision: https://reviews.llvm.org/D28777

llvm-svn: 292591
parent 880d8605
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