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[X86] XFormVExtractWithShuffleIntoLoad - handle shuffle mask scaling

Authored by RKSimon on Aug 8 2019, 9:05 AM.

Description

[X86] XFormVExtractWithShuffleIntoLoad - handle shuffle mask scaling

If the target shuffle mask is from a wider type, attempt to scale the mask so that the extraction can attempt to peek through.

Fixes the regression mentioned in rL368307

llvm-svn: 368308

Details