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Commit 832a6a19 authored by Andrew Trick's avatar Andrew Trick
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PreRA scheduler should avoid cloning compares. 

Added canClobberReachingPhysRegUse() to handle a particular pattern in
which a two-address instruction could be forced to interfere with
EFLAGS, causing a compare to be unnecessarilly cloned.
Fixes rdar://problem/5875261

llvm-svn: 138924
parent b9a89999
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