xref: /llvm-project/llvm/test/Transforms/Coroutines/coro-split-01.ll (revision 51d5d7bbae92493a5bfa7cc6b519de8a5bb32fdb) 
1; Tests that a coroutine is split, inlined into the caller and devirtualized.
2; RUN: opt < %s -S -passes='default<O2>' | FileCheck %s
3
4define ptr @f() 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 @malloc(i32 %size)
12  br label %coro.begin
13coro.begin:
14  %phi = phi ptr [ null, %entry ], [ %alloc, %dyn.alloc ]
15  %hdl = call ptr @llvm.coro.begin(token %id, ptr %phi)
16  call void @print(i32 0)
17  %0 = call i8 @llvm.coro.suspend(token none, i1 false)
18  switch i8 %0, label %suspend [i8 0, label %resume
19                                i8 1, label %cleanup]
20resume:
21  call void @print(i32 1)
22  br label %cleanup
23
24cleanup:
25  %mem = call ptr @llvm.coro.free(token %id, ptr %hdl)
26  call void @free(ptr %mem)
27  br label %suspend
28suspend:
29  call i1 @llvm.coro.end(ptr %hdl, i1 0, token none)
30  ret ptr %hdl
31}
32define i32 @main() {
33entry:
34  %hdl = call ptr @f()
35  call void @llvm.coro.resume(ptr %hdl)
36  ret i32 0
37; CHECK-LABEL: @main(
38; CHECK: call void @print(i32 0)
39; CHECK: call void @print(i32 1)
40; CHECK:      ret i32 0
41}
42
43declare ptr @llvm.coro.free(token, ptr)
44declare i32 @llvm.coro.size.i32()
45declare i8  @llvm.coro.suspend(token, i1)
46declare void @llvm.coro.resume(ptr)
47declare void @llvm.coro.destroy(ptr)
48
49declare token @llvm.coro.id(i32, ptr, ptr, ptr)
50declare i1 @llvm.coro.alloc(token)
51declare ptr @llvm.coro.begin(token, ptr)
52declare i1 @llvm.coro.end(ptr, i1, token)
53
54declare noalias ptr @malloc(i32)
55declare void @print(i32)
56declare void @free(ptr)
57