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Commit a0b1518a authored by Simon Pilgrim's avatar Simon Pilgrim
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[X86][SSE] Add getHopForBuildVector vector splitting 

If we only use the lower xmm of a ymm hop, then extract the xmm's (for free), perform the xmm hop and then insert back into a ymm (for free).

Fixes some of the regressions noted in D61782

llvm-svn: 360435
parent 7a41cd5b
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