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Commit 32367c06 authored by Manman Ren's avatar Manman Ren
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X86 Peephole: fix PR13475 in optimizeCompare. 

It is possible that an instruction can use and update EFLAGS.
When checking the safety, we should check the usage of EFLAGS first before
declaring it is safe to optimize due to the update.

llvm-svn: 160912
parent a83aaa0d
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