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// REQUIRES: x86_64-linux
// This tests that the coroutine elide optimization could happen succesfully with ThinLTO.
// This test is adapted from coro-elide.cpp and splits functions into two files.
//
// RUN: split-file %s %t
// RUN: %clang --target=x86_64-linux -std=c++20 -O2 -flto=thin -I %S -c %t/coro-elide-callee.cpp -o %t/coro-elide-callee.bc
// RUN: %clang --target=x86_64-linux -std=c++20 -O2 -flto=thin -I %S -c %t/coro-elide-caller.cpp -o %t/coro-elide-caller.bc
// RUN: llvm-lto --thinlto %t/coro-elide-callee.bc %t/coro-elide-caller.bc -o %t/summary
// RUN: %clang_cc1 -O2 -x ir %t/coro-elide-caller.bc -fthinlto-index=%t/summary.thinlto.bc -emit-llvm -o - | FileCheck %s
//--- coro-elide-task.h
#pragma once
#include "Inputs/coroutine.h"
struct Task {
struct promise_type {
struct FinalAwaiter {
bool await_ready() const noexcept { return false; }
template <typename PromiseType>
std::coroutine_handle<> await_suspend(std::coroutine_handle<PromiseType> h) noexcept {
if (!h)
return std::noop_coroutine();
return h.promise().continuation;
}
void await_resume() noexcept {}
};
Task get_return_object() noexcept {
return std::coroutine_handle<promise_type>::from_promise(*this);
}
std::suspend_always initial_suspend() noexcept { return {}; }
FinalAwaiter final_suspend() noexcept { return {}; }
void unhandled_exception() noexcept {}
void return_value(int x) noexcept {
_value = x;
}
std::coroutine_handle<> continuation;
int _value;
};
Task(std::coroutine_handle<promise_type> handle) : handle(handle) {}
~Task() {
if (handle)
handle.destroy();
}
struct Awaiter {
bool await_ready() const noexcept { return false; }
void await_suspend(std::coroutine_handle<void> continuation) noexcept {}
int await_resume() noexcept {
return 43;
}
};
auto operator co_await() {
return Awaiter{};
}
private:
std::coroutine_handle<promise_type> handle;
};
//--- coro-elide-callee.cpp
#include "coro-elide-task.h"
Task task0() {
co_return 43;
}
//--- coro-elide-caller.cpp
#include "coro-elide-task.h"
Task task0();
Task task1() {
co_return co_await task0();
}
// CHECK-LABEL: define{{.*}} void @_Z5task1v.resume
// CHECK-NOT: {{.*}}_Znwm
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