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Commit a3dc1ba1 authored by Ahmed Bougacha's avatar Ahmed Bougacha
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[X86] Try to zero elts when lowering 256-bit shuffle with PSHUFB. 

Otherwise we fallback to a blend of PSHUFBs later on.

Differential Revision: http://reviews.llvm.org/D19661

llvm-svn: 271113
parent 2d39bb3c
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