xref: /llvm-project/llvm/test/Transforms/Coroutines/ex1.ll (revision 51d5d7bbae92493a5bfa7cc6b519de8a5bb32fdb) 
1; First example from Doc/Coroutines.rst (one block loop)
2; RUN: opt < %s -aa-pipeline=basic-aa -passes='default<O2>' -preserve-alignment-assumptions-during-inlining=false -S | FileCheck %s
3
4define ptr @f(i32 %n) presplitcoroutine {
5entry:
6  %id = call token @llvm.coro.id(i32 0, ptr null, ptr null, ptr null)
7  %size = call i32 @llvm.coro.size.i32()
8  %alloc = call ptr @malloc(i32 %size)
9  %hdl = call noalias ptr @llvm.coro.begin(token %id, ptr %alloc)
10  br label %loop
11loop:
12  %n.val = phi i32 [ %n, %entry ], [ %inc, %loop ]
13  %inc = add nsw i32 %n.val, 1
14  call void @print(i32 %n.val)
15  %0 = call i8 @llvm.coro.suspend(token none, i1 false)
16  switch i8 %0, label %suspend [i8 0, label %loop
17                                i8 1, label %cleanup]
18cleanup:
19  %mem = call ptr @llvm.coro.free(token %id, ptr %hdl)
20  call void @free(ptr %mem)
21  br label %suspend
22suspend:
23  call i1 @llvm.coro.end(ptr %hdl, i1 false, token none)
24  ret ptr %hdl
25}
26
27; CHECK-LABEL: @main(
28define i32 @main() {
29entry:
30  %hdl = call ptr @f(i32 4)
31  call void @llvm.coro.resume(ptr %hdl)
32  call void @llvm.coro.resume(ptr %hdl)
33  call void @llvm.coro.destroy(ptr %hdl)
34  ret i32 0
35; CHECK-NEXT: entry:
36; CHECK:      call void @print(i32 4)
37; CHECK:      call void @print(i32 5)
38; CHECK:      call void @print(i32 6)
39; CHECK:      ret i32 0
40}
41
42declare ptr @malloc(i32)
43declare void @free(ptr)
44declare void @print(i32)
45
46declare token @llvm.coro.id(i32, ptr, ptr, ptr)
47declare i32 @llvm.coro.size.i32()
48declare ptr @llvm.coro.begin(token, ptr)
49declare i8 @llvm.coro.suspend(token, i1)
50declare ptr @llvm.coro.free(token, ptr)
51declare i1 @llvm.coro.end(ptr, i1, token)
52
53declare void @llvm.coro.resume(ptr)
54declare void @llvm.coro.destroy(ptr)
55