[PATCH] D98638: [RFC][Coroutine] Force stack allocation after await_suspend() call

[Xun Li via Phabricator via llvm-commits]

lxfind added a comment.

> Then if we want to put the result of the await_suspend in the stack, I think we can do it under CodeGen part only. It should be easy to judge the return type of await_suspend and create a call to llvm.coro.forcestack to the return value of await_suspend.

We probably could, but it would be very very tedious. 
During CodeGen, we only have the AST that's calling __builtin_coro_resume, which we will call Emit as a whole.
So we need to manually match the AST 2 levels down to find the await_suspend call, get its name, and then walk through the emitted IR to find a call with the same name, and then find the tmp that's used to store the return value of the call, and then emit llvm.coro.forcestack.


Repository:
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https://reviews.llvm.org/D98638