[PATCH] D141673: [PowerPC] refactor eligible check for tail call optimization

[Ting Wang via Phabricator via llvm-commits]

tingwang created this revision.
tingwang added reviewers: shchenz, nemanjai, PowerPC.
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The check logic for TCO is scattered in two functions: `IsEligibleForTailCallOptimization_64SVR4()` `IsEligibleForTailCallOptimization()`, and serves instruction selection phase only at this moment.

There is one scenario (D131953 <https://reviews.llvm.org/D131953>) during transformation, we would like to determine if tailcall can be guaranteed or not. Existing logic cannot be directly reused due to dependency on DAG and SDValue etc.

This patch aims to refactor existing logic to export an API for TCO eligible query before instruction selection phase.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D141673

Files:
  llvm/lib/Target/PowerPC/PPCISelLowering.cpp
  llvm/lib/Target/PowerPC/PPCISelLowering.h

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