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Commit 800f85ba authored by Cameron Zwarich's avatar Cameron Zwarich
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Merge information about the number of zero, one, and sign bits of live-out registers 

at phis. This enables us to eliminate a lot of pointless zexts during the DAGCombine
phase. This fixes <rdar://problem/8760114>.

llvm-svn: 126170
parent f248f945
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