Anton Sidorenko fb47bb37e4 [MachineTraceMetrics] Pick the trace successor for an entry block ...

We generate erroneous trace for a basic block if it does not have at least one
predecessor when MinInstr strategy is used. Currently only this strategy is
implemented, so we always have a wrong trace for any entry block. This results in
wrong instructions heights calculation and also leads to wrong critical path.

The described behavior is demonstrated on a simple test. It shows that early
if-conv pass makes wrong decisions due to incorrectly calculated critical path
lenght.

Differential Revision: https://reviews.llvm.org/D138272

2022-11-21 12:56:40 +03:00

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