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Commit 66c04c48 authored by Chris Lattner's avatar Chris Lattner
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use getPredicateOnEdge to fold comparisons through PHI nodes, 

which implements GCC PR18046.  This also gets us 360 more
jump threads on 176.gcc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86953 91177308-0d34-0410-b5e6-96231b3b80d8
parent f496e79f
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