[all-commits] [llvm/llvm-project] ea5989: Start of an llvm.coro.async implementation

[Arnold Schwaighofer via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: ea5989b43adb4a7d169852af398e382216907998
      https://github.com/llvm/llvm-project/commit/ea5989b43adb4a7d169852af398e382216907998
  Author: Arnold Schwaighofer <aschwaighofer at apple.com>
  Date:   2020-11-04 (Wed, 04 Nov 2020)

  Changed paths:
    M llvm/docs/Coroutines.rst
    M llvm/include/llvm/IR/Intrinsics.td
    M llvm/lib/Transforms/Coroutines/CoroCleanup.cpp
    M llvm/lib/Transforms/Coroutines/CoroEarly.cpp
    M llvm/lib/Transforms/Coroutines/CoroFrame.cpp
    M llvm/lib/Transforms/Coroutines/CoroInstr.h
    M llvm/lib/Transforms/Coroutines/CoroInternal.h
    M llvm/lib/Transforms/Coroutines/CoroSplit.cpp
    M llvm/lib/Transforms/Coroutines/Coroutines.cpp
    A llvm/test/Transforms/Coroutines/coro-async.ll

  Log Message:
  -----------
  Start of an llvm.coro.async implementation

This patch adds the `async` lowering of coroutines.

This will be used by the Swift frontend to lower async functions. In
contrast to the `retcon` lowering the frontend needs to be in control
over control-flow at suspend points as execution might be suspended at
these points.

This is very much work in progress and the implementation will change as
it evolves with the frontend. As such the documentation is lacking
detail as some of it might change.

rdar://70097093

Reapply with fix for memory sanitizer failure and sphinx failure.

Differential Revision: https://reviews.llvm.org/D90612