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Commit 92f6e429 authored by Cameron Zwarich's avatar Cameron Zwarich
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Avoid iterating every operand of an instruction in StrongPHIElimination, since 

we are only interested in the defs when discovering interferences.

This is a 28% speedup running StrongPHIElimination on 403.gcc.

llvm-svn: 122596
parent 496770de
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