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Commit e0cff30c authored by Simon Pilgrim's avatar Simon Pilgrim
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[X86][SSE] LowerVectorAllZeroTest - add support for pre-SSE41 targets 

Even without PTEST, we can still efficiently perform an OR reduction as PMOVMSKB(PCMPEQB(X,0)) == 0, avoiding xmm->gpr extractions.
parent 136d78ca
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