xref: /llvm-project/llvm/test/Transforms/Coroutines/ex2.ll (revision 51d5d7bbae92493a5bfa7cc6b519de8a5bb32fdb) 
1; Second example from Doc/Coroutines.rst (custom alloc and free functions)
2; RUN: opt < %s -passes='default<O2>' -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  %need.dyn.alloc = call i1 @llvm.coro.alloc(token %id)
8  br i1 %need.dyn.alloc, label %dyn.alloc, label %coro.begin
9dyn.alloc:
10  %size = call i32 @llvm.coro.size.i32()
11  %alloc = call ptr @CustomAlloc(i32 %size)
12  br label %coro.begin
13coro.begin:
14  %phi = phi ptr [ null, %entry ], [ %alloc, %dyn.alloc ]
15  %hdl = call noalias ptr @llvm.coro.begin(token %id, ptr %phi)
16  br label %loop
17loop:
18  %n.val = phi i32 [ %n, %coro.begin ], [ %inc, %loop ]
19  %inc = add nsw i32 %n.val, 1
20  call void @print(i32 %n.val)
21  %0 = call i8 @llvm.coro.suspend(token none, i1 false)
22  switch i8 %0, label %suspend [i8 0, label %loop
23                                i8 1, label %cleanup]
24cleanup:
25  %mem = call ptr @llvm.coro.free(token %id, ptr %hdl)
26  %need.dyn.free = icmp ne ptr %mem, null
27  br i1 %need.dyn.free, label %dyn.free, label %suspend
28dyn.free:
29  call void @CustomFree(ptr %mem)
30  br label %suspend
31suspend:
32  call i1 @llvm.coro.end(ptr %hdl, i1 false, token none)
33  ret ptr %hdl
34}
35
36; CHECK-LABEL: @main
37define i32 @main() {
38entry:
39  %hdl = call ptr @f(i32 4)
40  call void @llvm.coro.resume(ptr %hdl)
41  call void @llvm.coro.resume(ptr %hdl)
42  %to = icmp eq ptr %hdl, null
43  br i1 %to, label %return, label %destroy
44destroy:
45  call void @llvm.coro.destroy(ptr %hdl)
46  br label %return
47return:
48  ret i32 0
49; CHECK-NOT:  call ptr @CustomAlloc
50; CHECK:      call void @print(i32 4)
51; CHECK-NEXT: call void @print(i32 5)
52; CHECK-NEXT: call void @print(i32 6)
53; CHECK-NEXT: ret i32 0
54}
55
56declare ptr @CustomAlloc(i32)
57declare void @CustomFree(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