Florian Hahn 0d0190815d [TailDup] Allow large number of predecessors/successors without phis. (#116072) ...

This adjusts the threshold logic added in #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: https://github.com/llvm/llvm-project/pull/116072

2025-01-23 18:24:20 +00:00

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