Vasileios Porpodas 6f9640d6a3 [RegAlloc] Add a complexity limit in growRegion() to cap compilation time. ...

growRegion() does not scale in code with BBs with a very large number of edges.
In such code growRegion() becomes a compile-time bottleneck, consuming 60% of
the total compilation time.
This patch adds a limit to the complexity of growRegion() by incrementing a counter
in each iteration. We bail out once the limit is reached.

Differential Revision: https://reviews.llvm.org/D120752

2022-03-03 11:31:07 -08:00

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