[PATCH] D103275: Update musttail verification to check all swiftasync->swiftasync tail calls.

[Arnold Schwaighofer via Phabricator via llvm-commits]

aschwaighofer added a comment.

The whole point behind the `swiftasynccc` convention (`swifttailcc` in llvm; whose clang support we still have to upstream I think) is to use only constant stack space for an unbounded number of calls in tail call position. So this is an invariant in my opinion. If a frontend wants to opt out of that invariant in can annotate the call with `nottail`. The c frontend marks calls in tail position immediately followed by a `return` as musttail. The swift frontend uses `musttail` wherever appropriate.


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  https://reviews.llvm.org/D103275/new/

https://reviews.llvm.org/D103275