[PATCH] D128163: [Coroutines] Don't add musttail call if WebAssembly are enabled

[Adrian Vogelsgesang via Phabricator via llvm-commits]

avogelsgesang added a comment.

Afaict, symmetric transfer is guaranteed by the C++20 standard.

https://eel.is/c++draft/expr.await#note-1 states

> [...] Any number of coroutines can be successively resumed in this fashion, eventually returning control flow to the current coroutine caller or resumer [...]

Without symmetric transfer or an equivalent optimization, this statement wouldn't hold true, because we would run out of stack space before resuming an arbitrary number of coroutines


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  https://reviews.llvm.org/D128163/new/

https://reviews.llvm.org/D128163