[PATCH] [x86] Implement a faster vector population count based on the PSHUFB in-register LUT technique.

[Owen Anderson]

I believe the same approach would work on ARM64, which also as byte-wise vector popcounts and can do interleave-with-zero.  Do you think it would be worthwhile to find a way to share the core of this approach?

—Owen


http://reviews.llvm.org/D10084

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