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Commit bb360740 authored by Manman Ren's avatar Manman Ren
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X86: Fix optimizeCompare to correctly check safe condition. 

It is safe if EFLAGS is killed or re-defined.
When we are done with the basic block, check whether EFLAGS is live-out.
Do not optimize away cmp if EFLAGS is live-out.

llvm-svn: 159888
parent 80eb0c50
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