[PATCH] D16072: [X86][SSE] Add INSERTPS target shuffle combines.

[Simon Pilgrim via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: spatel, andreadb, chandlerc.
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As vector shuffles can only reference two inputs many (V)INSERTPS patterns end up being split over two targets shuffles.

This patch adds combines to attempt to combine (V)INSERTPS nodes with input/output nodes that are just zeroing out these additional vector elements.



Repository:
  rL LLVM

http://reviews.llvm.org/D16072

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/insertps-combine.ll
  test/CodeGen/X86/vector-shuffle-128-v4.ll

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