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b92a8375b0
Summary: The lowering of PHI nodes used to detect if all inputs originated from IMPLICIT_DEF's. If so the PHI node was replaced by an IMPLICIT_DEF. Now we also consider undef uses when checking the inputs. So if all inputs are implicitly defined or undef we lower the PHI to an IMPLICIT_DEF. This makes PHIElimination::LowerPHINode more consistent as it checks both implicit and undef properties at later stages. Reviewers: MatzeB, tstellar Reviewed By: MatzeB Subscribers: jvesely, nhaehnle, llvm-commits Differential Revision: https://reviews.llvm.org/D52558 llvm-svn: 343417 |
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