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[X86][SSE] Avoid vector byte shuffles with zero by using pshufb to create zeros
author
Simon Pilgrim
<llvm-dev@redking.me.uk>
Fri, 9 Jan 2015 22:03:19 +0000
(22:03 +0000)
committer
Simon Pilgrim
<llvm-dev@redking.me.uk>
Fri, 9 Jan 2015 22:03:19 +0000
(22:03 +0000)
pshufb can shuffle in zero bytes as well as bytes from a source vector - we can use this to avoid having to shuffle 2 vectors and ORing the result when the used inputs from a vector are all zeroable.
Differential Revision: http://reviews.llvm.org/D6878
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225551
91177308
-0d34-0410-b5e6-
96231b3b80d8
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