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Commit 1b59a16c authored by Simon Pilgrim's avatar Simon Pilgrim
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[CostModel][X86] Improve sum reduction costs. 

I can't see any notable differences in costs between SSE2 and SSE42 arches for FADD/ADD reduction, so I've lowered the target to just SSE2.

I've also added vXi8 sum reduction costs in line with the PSADBW codegen and discussions on PR42674.

llvm-svn: 374655
parent ba229557
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