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Commit 99db883d authored by Craig Topper's avatar Craig Topper
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[X86] Teach lower1BitVectorShuffle to recognize shuffles that are just filling... 

[X86] Teach lower1BitVectorShuffle to recognize shuffles that are just filling upper elements with zero. Replace with insert_subvector.

There's still some extra kshifts in one of the modified test cases here, but hopefully that's only a DAG combine away.

llvm-svn: 324782
parent 7512c3e1
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