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Commit cb8a0ba8 authored by Simon Pilgrim's avatar Simon Pilgrim
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[X86][SSE] Add LowerVectorAllZero helper for checking if all bits of a vector are zero. 

Pull the lowering code out of LowerVectorAllZeroTest (and rename it MatchVectorAllZeroTest).

We should be able to reuse this in combineVectorSizedSetCCEquality as well.

Another cleanup to simplify D81547.
parent 57c9dc05
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