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Commit 77215579 authored by Simon Pilgrim's avatar Simon Pilgrim
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[X86][SSE] isHorizontalBinOp - ensure we clear any unused source operands to... 

[X86][SSE] isHorizontalBinOp - ensure we clear any unused source operands to improve HADD/SUB matching

Our shuffle matching for HADD/SUB patterns wasn't clearing repeated ops in 'fake unary' style shuffle masks (unpack(x,x) etc.), preventing matching of add(fakeunary(),fakeunary()) style patterns.
parent 0aceb616
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