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Commit 0a12c239 authored by Simon Pilgrim's avatar Simon Pilgrim
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[X86] truncateVectorCompareWithPACKSS - use PACKSSDW/PACKSSWB instead of just PACKSSWB. 

By using the widest type possible for PACKSS truncation we have a better chance of being able to peek through bitcasts and improves other combines driven by ComputeNumSignBits.

llvm-svn: 316448
parent 1216acc3
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