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[X86] Legalize 128/256 gathers/scatters on KNL by using widening rather than…

Authored by craig.topper on Jan 11 2018, 11:38 AM.

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[X86] Legalize 128/256 gathers/scatters on KNL by using widening rather than sign extending the index.

We can just widen the vectors with undef and zero extend the mask.

llvm-svn: 322308

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craig.topperJan 11 2018, 11:38 AM
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rG0ce22ef7991c: [WebAssemly] Rename and improve formatting for ctor/dtor test
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