[PATCH] D42044: X86: Utilize ZeroableElements for canWidenShuffleElements

[Zvi Rackover via Phabricator via llvm-commits]

zvi created this revision.
zvi added reviewers: RKSimon, craig.topper.

canWidenShuffleElements can do a better job if given a mask with
ZeroableElements info. Apparently, ZeroableElements was being only used
to identify AllZero candidates, but posssibly we could plug it into more
shuffle matchers.


Repository:
  rL LLVM

https://reviews.llvm.org/D42044

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/2012-04-26-sdglue.ll
  test/CodeGen/X86/avx-cast.ll
  test/CodeGen/X86/vector-shuffle-256-v32.ll

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