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Commit 78b5a3c3 authored by Simon Pilgrim's avatar Simon Pilgrim
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[X86][SSE] LowerVectorCTPOP - pull out repeated byte sum stage. 

Pull out repeated byte sum stage for popcount of vector elements > 8bits.

This allows us to simplify the LUT/BITMATH popcnt code to always assume vXi8 vectors, and also improves avx512bitalg codegen which only has access to vpopcntb/vpopcntw.

llvm-svn: 344348
parent 9552dd18
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