[PATCH] D142620: [Coroutines] Improve rematerialization stage

[David Stuttard via Phabricator via llvm-commits]

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As originally implemented, the rematerialization of valid instructions across
the suspend point would iterate 4 times, meaning that up to 4 instructions could
be rematerialized.

This implementation changes that approach to instead build a graph of
rematerializable instructions, then move all of them. This is faster than the
original approach and is not limited to an arbitrary limit.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D142620

Files:
  llvm/lib/Transforms/Coroutines/CoroFrame.cpp
  llvm/test/Transforms/Coroutines/coro-materialize.ll
  llvm/test/Transforms/Coroutines/coro-retcon-remat.ll

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