[PATCH] [DAGCombiner] Remove extra bitcasts surrounding vector shuffles

[Simon Pilgrim]

Hi qcolombet, andreadb, spatel,

Patch to remove extra bitcasts from shuffles, this is often a legacy of XformToShuffleWithZero being used to combine bitmaskings (of float vectors bitcast to integer vectors) into shuffles:

bitcast(shuffle(bitcast(s0),bitcast(s1))) -> shuffle(s0,s1)

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D9097

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/X86/combine-or.ll

EMAIL PREFERENCES
  http://reviews.llvm.org/settings/panel/emailpreferences/
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