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8c5fc073fd
The `coro.end.async` intrinsic allow specifying a function that is to be
tail-called as the last thing before returning.
LLVM lowering will inline the `must-tail-call` function argument to
`coro.end.async`. This `must-tail-call` function can contain a
`musttail` call.
```
define @my_must_tail_call_func(void (*)(i64) %fnptr, i64 %args) {
musttail call void %fnptr(i64 %args)
ret void
}
define @async_func() {
...
coro.end.async(..., @my_must_tail_call_func, %return_continuation, i64 %args)
unreachable
}
```
15 lines
419 B
Swift
15 lines
419 B
Swift
// RUN: %target-swift-frontend -primary-file %s -g -emit-ir -enable-experimental-concurrency -disable-llvm-optzns -disable-swift-specific-llvm-optzns | %FileCheck %s
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// REQUIRES: concurrency
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// CHECK: call i1 (i8*, i1, ...) @llvm.coro.end.async
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func foo() async -> Never {
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await bar()
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fatalError()
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}
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// CHECK: call i1 (i8*, i1, ...) @llvm.coro.end.async
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func bar() async -> Never {
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await foo()
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fatalError()
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}
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