Simon Pilgrim 9daacec816 [CostModel][X86] Add bool anyof/allof reduction costs ...

On pre-AVX512 targets we can use MOVMSK to extract reduced boolean results. This is properly optimized, annoyingly AVX512 isn't and produces code that is almost as bad as the (unchanged) costs suggest......

Differential Revision: https://reviews.llvm.org/D60403

llvm-svn: 358574

2019-04-17 10:58:19 +00:00

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