[PATCH] D14050: [X86][SSE] Shuffle blends with zero

[Simon Pilgrim via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: spatel, andreadb, delena, qcolombet.
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This patch generalizes the zeroing of vector elements with the BLEND instructions. Currently a zero vector will only blend if the shuffled elements are correctly inline, this patch recognises when a vector input is zero (or zeroable) and modifies a local copy of the shuffle mask to support a blend. As a zeroable vector input may not be all zeroes, the zeroable vector is regenerated if necessary.

Repository:
  rL LLVM

http://reviews.llvm.org/D14050

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/avx-vperm2x128.ll

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