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Commit 5b9bade8 authored by Simon Pilgrim's avatar Simon Pilgrim
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[X86][SSSE3] Added PSHUFB LUT implementation of BITREVERSE 

PSHUFB can speed up BITREVERSE of byte vectors by performing LUT on the low/high nibbles separately and ORing the results. Wider integer vector types are already BSWAP'd beforehand so also make use of this approach.

llvm-svn: 272477
parent b13961d2
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