xref: /llvm-project/llvm/test/Transforms/Coroutines/ex4.ll (revision 51d5d7bbae92493a5bfa7cc6b519de8a5bb32fdb) 
1; Fourth example from Doc/Coroutines.rst (coroutine promise)
2; RUN: opt < %s -passes='default<O2>' -S | FileCheck %s
3
4define ptr @f(i32 %n) presplitcoroutine {
5entry:
6  %promise = alloca i32
7  %id = call token @llvm.coro.id(i32 0, ptr %promise, ptr null, ptr null)
8  %need.dyn.alloc = call i1 @llvm.coro.alloc(token %id)
9  br i1 %need.dyn.alloc, label %dyn.alloc, label %coro.begin
10dyn.alloc:
11  %size = call i32 @llvm.coro.size.i32()
12  %alloc = call ptr @malloc(i32 %size)
13  br label %coro.begin
14coro.begin:
15  %phi = phi ptr [ null, %entry ], [ %alloc, %dyn.alloc ]
16  %hdl = call noalias ptr @llvm.coro.begin(token %id, ptr %phi)
17  br label %loop
18loop:
19  %n.val = phi i32 [ %n, %coro.begin ], [ %inc, %loop ]
20  %inc = add nsw i32 %n.val, 1
21  store i32 %n.val, ptr %promise
22  %0 = call i8 @llvm.coro.suspend(token none, i1 false)
23  switch i8 %0, label %suspend [i8 0, label %loop
24                                i8 1, label %cleanup]
25cleanup:
26  %mem = call ptr @llvm.coro.free(token %id, ptr %hdl)
27  call void @free(ptr %mem)
28  br label %suspend
29suspend:
30  call i1 @llvm.coro.end(ptr %hdl, i1 false, token none)
31  ret ptr %hdl
32}
33
34; CHECK-LABEL: @main
35define i32 @main() {
36entry:
37  %hdl = call ptr @f(i32 4)
38  %promise.addr.raw = call ptr @llvm.coro.promise(ptr %hdl, i32 4, i1 false)
39  %val0 = load i32, ptr %promise.addr.raw
40  call void @print(i32 %val0)
41  call void @llvm.coro.resume(ptr %hdl)
42  %val1 = load i32, ptr %promise.addr.raw
43  call void @print(i32 %val1)
44  call void @llvm.coro.resume(ptr %hdl)
45  %val2 = load i32, ptr %promise.addr.raw
46  call void @print(i32 %val2)
47  call void @llvm.coro.destroy(ptr %hdl)
48  ret i32 0
49; CHECK:      call void @print(i32 4)
50; CHECK-NEXT: call void @print(i32 5)
51; CHECK-NEXT: call void @print(i32 6)
52; CHECK:      ret i32 0
53}
54
55declare ptr @llvm.coro.promise(ptr, i32, i1)
56declare ptr @malloc(i32)
57declare void @free(ptr)
58declare void @print(i32)
59
60declare token @llvm.coro.id(i32, ptr, ptr, ptr)
61declare i1 @llvm.coro.alloc(token)
62declare i32 @llvm.coro.size.i32()
63declare ptr @llvm.coro.begin(token, ptr)
64declare i8 @llvm.coro.suspend(token, i1)
65declare ptr @llvm.coro.free(token, ptr)
66declare i1 @llvm.coro.end(ptr, i1, token)
67
68declare void @llvm.coro.resume(ptr)
69declare void @llvm.coro.destroy(ptr)
70