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Commit 0d35edda authored by Craig Topper's avatar Craig Topper
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[X86] In LowerTruncateVecI1, don't add SHL if the input is known to be all sign bits. 

If the input is all sign bits then the LSB through MSB are all the same so we don't need to be move the LSB to the MSB.

llvm-svn: 321617
parent c535adcf
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