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1; Fourth example from Doc/Coroutines.rst (coroutine promise)
2; RUN: opt < %s -O2 -enable-coroutines -S | FileCheck %s
3; RUN: opt < %s -passes='default<O2>' -enable-coroutines -S | FileCheck %s
4
5define i8* @f(i32 %n) {
6entry:
7  %promise = alloca i32
8  %pv = bitcast i32* %promise to i8*
9  %id = call token @llvm.coro.id(i32 0, i8* %pv, i8* null, i8* null)
10  %need.dyn.alloc = call i1 @llvm.coro.alloc(token %id)
11  br i1 %need.dyn.alloc, label %dyn.alloc, label %coro.begin
12dyn.alloc:
13  %size = call i32 @llvm.coro.size.i32()
14  %alloc = call i8* @malloc(i32 %size)
15  br label %coro.begin
16coro.begin:
17  %phi = phi i8* [ null, %entry ], [ %alloc, %dyn.alloc ]
18  %hdl = call noalias i8* @llvm.coro.begin(token %id, i8* %phi)
19  br label %loop
20loop:
21  %n.val = phi i32 [ %n, %coro.begin ], [ %inc, %loop ]
22  %inc = add nsw i32 %n.val, 1
23  store i32 %n.val, i32* %promise
24  %0 = call i8 @llvm.coro.suspend(token none, i1 false)
25  switch i8 %0, label %suspend [i8 0, label %loop
26                                i8 1, label %cleanup]
27cleanup:
28  %mem = call i8* @llvm.coro.free(token %id, i8* %hdl)
29  call void @free(i8* %mem)
30  br label %suspend
31suspend:
32  call i1 @llvm.coro.end(i8* %hdl, i1 false)
33  ret i8* %hdl
34}
35
36; CHECK-LABEL: @main
37define i32 @main() {
38entry:
39  %hdl = call i8* @f(i32 4)
40  %promise.addr.raw = call i8* @llvm.coro.promise(i8* %hdl, i32 4, i1 false)
41  %promise.addr = bitcast i8* %promise.addr.raw to i32*
42  %val0 = load i32, i32* %promise.addr
43  call void @print(i32 %val0)
44  call void @llvm.coro.resume(i8* %hdl)
45  %val1 = load i32, i32* %promise.addr
46  call void @print(i32 %val1)
47  call void @llvm.coro.resume(i8* %hdl)
48  %val2 = load i32, i32* %promise.addr
49  call void @print(i32 %val2)
50  call void @llvm.coro.destroy(i8* %hdl)
51  ret i32 0
52; CHECK:      call void @print(i32 4)
53; CHECK-NEXT: call void @print(i32 5)
54; CHECK-NEXT: call void @print(i32 6)
55; CHECK:      ret i32 0
56}
57
58declare i8* @llvm.coro.promise(i8*, i32, i1)
59declare i8* @malloc(i32)
60declare void @free(i8*)
61declare void @print(i32)
62
63declare token @llvm.coro.id(i32, i8*, i8*, i8*)
64declare i1 @llvm.coro.alloc(token)
65declare i32 @llvm.coro.size.i32()
66declare i8* @llvm.coro.begin(token, i8*)
67declare i8 @llvm.coro.suspend(token, i1)
68declare i8* @llvm.coro.free(token, i8*)
69declare i1 @llvm.coro.end(i8*, i1)
70
71declare void @llvm.coro.resume(i8*)
72declare void @llvm.coro.destroy(i8*)
73