[PATCH] D134019: [MachineCycle][NFC]add a cache from block and top level cycle mapping

[ChenZheng via Phabricator via llvm-commits]

shchenz created this revision.
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This solves the big compile time regression in https://github.com/llvm/llvm-project/issues/57664

The hot function is `getTopLevelParentCycle`.

Too many redundant computations to get a top level cycle for a block.

This patch improves compile time about X15 on PPC64 Linux.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D134019

Files:
  llvm/include/llvm/ADT/GenericCycleImpl.h
  llvm/include/llvm/ADT/GenericCycleInfo.h

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