[PATCH] D28777: [InstCombine][SSE] Add DemandedElts support for PACKSS/PACKUS instructions

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: mkuper, m_zuckerman, spatel, andreadb.
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RKSimon set the repository for this revision to rL LLVM.

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


Repository:
  rL LLVM

https://reviews.llvm.org/D28777

Files:
  lib/Transforms/InstCombine/InstCombineCalls.cpp
  lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
  test/Transforms/InstCombine/x86-pack.ll

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