[TailDup] Allow large number of predecessors/successors without phis.… #9878
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…llvm#116072) This adjusts the threshold logic added in llvm#78582 to only trigger for cases where there are actually phis to duplicate in either TailBB or in one of the successors. In cases there are no phis, we only have to pay the cost of extra edges, but have no explosion in PHI related instructions. This improves performance of Python on some inputs by 2-3% on Apple Silicon CPUs. PR: llvm#116072
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@swift-ci please test |
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@swift-ci please test llvm |
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… (llvm#116072)
This adjusts the threshold logic added in llvm#78582 to only trigger for cases where there are actually phis to duplicate in either TailBB or in one of the successors.
In cases there are no phis, we only have to pay the cost of extra edges, but have no explosion in PHI related instructions.
This improves performance of Python on some inputs by 2-3% on Apple Silicon CPUs.
PR: llvm#116072