1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
// The output of O0 is highly redundant and hard to test. Also it is not good
// limit the output of O0. So we test the optimized output from O0. The idea
// is the optimizations shouldn't change the semantics of the program.
// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -std=c++20 \
// RUN: -O0 -emit-llvm %s -o - -disable-O0-optnone \
// RUN: | opt -passes='sroa,mem2reg,simplifycfg' -S | FileCheck %s --check-prefix=CHECK-O0
#include "Inputs/coroutine.h"
// A simple awaiter type with an await_suspend method that can't be
// inlined.
struct Awaiter {
const int& x;
bool await_ready() { return false; }
std::coroutine_handle<> await_suspend(const std::coroutine_handle<> h);
void await_resume() {}
};
struct MyTask {
// A lazy promise with an await_transform method that supports awaiting
// integer references using the Awaiter struct above.
struct promise_type {
MyTask get_return_object() {
return MyTask{
std::coroutine_handle<promise_type>::from_promise(*this),
};
}
std::suspend_always initial_suspend() { return {}; }
std::suspend_always final_suspend() noexcept { return {}; }
void unhandled_exception();
auto await_transform(const int& x) { return Awaiter{x}; }
};
std::coroutine_handle<> h;
};
// A global array of integers.
int g_array[32];
// A coroutine that awaits each integer in the global array.
MyTask FooBar() {
for (const int& x : g_array) {
co_await x;
}
}
// CHECK-O0: define{{.*}}@_Z6FooBarv.resume
// CHECK-O0: call{{.*}}@_Z6FooBarv.__await_suspend_wrapper__await(
// CHECK-O0-NOT: store
// CHECK-O0: ret void
|
