[PATCH] D20998: [InstCombine][SSE] Add MOVMSK constant folding (PR27982)

[Simon Pilgrim via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: spatel, andreadb, ab.
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This patch adds support for folding undef/zero/constant inputs to MOVMSK instructions.

The SSE/AVX versions can be fully folded, but the MMX version can only handle undef inputs.

Repository:
  rL LLVM

http://reviews.llvm.org/D20998

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

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