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Commit 262e4200 authored by Simon Pilgrim's avatar Simon Pilgrim
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[X86][SSE] Pull out combineToHorizontalAddSub helper from inside (F)ADD/SUB... 

[X86][SSE] Pull out combineToHorizontalAddSub helper from inside (F)ADD/SUB combines (REAPPLIED). NFCI.

The intention is to be able to run this from additional locations (such as shuffle combining) in the future.

Reapplies rGb95a103808ac (after reversion at rGc012a388a15b), with SSE3/SSSE3 typo fix, test added at rG0afb10de1449.
parent 13c22e75
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