xref: /llvm-project/llvm/test/Transforms/Coroutines/coro-frame-reuse-alloca-01.ll (revision 51d5d7bbae92493a5bfa7cc6b519de8a5bb32fdb)
1; Tests that variables in a Corotuine whose lifetime range is not overlapping each other
2; re-use the same slot in Coroutine frame.
3; RUN: opt < %s -passes='cgscc(coro-split<reuse-storage>),simplifycfg,early-cse' -S | FileCheck %s
4%"struct.task::promise_type" = type { i8 }
5%struct.awaitable = type { i8 }
6%struct.big_structure = type { [500 x i8] }
7declare ptr @malloc(i64)
8declare void @consume(ptr)
9define void @a(i1 zeroext %cond) presplitcoroutine {
10entry:
11  %__promise = alloca %"struct.task::promise_type", align 1
12  %a = alloca %struct.big_structure, align 1
13  %ref.tmp7 = alloca %struct.awaitable, align 1
14  %b = alloca %struct.big_structure, align 1
15  %ref.tmp18 = alloca %struct.awaitable, align 1
16  %0 = call token @llvm.coro.id(i32 16, ptr nonnull %__promise, ptr @a, ptr null)
17  br label %init.ready
18init.ready:
19  %1 = call noalias nonnull ptr @llvm.coro.begin(token %0, ptr null)
20  call void @llvm.lifetime.start.p0(i64 1, ptr nonnull %__promise)
21  br i1 %cond, label %if.then, label %if.else
22if.then:
23  call void @llvm.lifetime.start.p0(i64 500, ptr nonnull %a)
24  call void @consume(ptr nonnull %a)
25  %save = call token @llvm.coro.save(ptr null)
26  %suspend = call i8 @llvm.coro.suspend(token %save, i1 false)
27  switch i8 %suspend, label %coro.ret [
28    i8 0, label %await.ready
29    i8 1, label %cleanup1
30  ]
31await.ready:
32  call void @llvm.lifetime.end.p0(i64 500, ptr nonnull %a)
33  br label %cleanup1
34if.else:
35  call void @llvm.lifetime.start.p0(i64 500, ptr nonnull %b)
36  call void @consume(ptr nonnull %b)
37  %save2 = call token @llvm.coro.save(ptr null)
38  %suspend2 = call i8 @llvm.coro.suspend(token %save2, i1 false)
39  switch i8 %suspend2, label %coro.ret [
40    i8 0, label %await2.ready
41    i8 1, label %cleanup2
42  ]
43await2.ready:
44  call void @llvm.lifetime.end.p0(i64 500, ptr nonnull %b)
45  br label %cleanup2
46cleanup1:
47  call void @llvm.lifetime.end.p0(i64 500, ptr nonnull %a)
48  br label %cleanup
49cleanup2:
50  call void @llvm.lifetime.end.p0(i64 500, ptr nonnull %b)
51  br label %cleanup
52cleanup:
53  call ptr @llvm.coro.free(token %0, ptr %1)
54  br label %coro.ret
55coro.ret:
56  call i1 @llvm.coro.end(ptr null, i1 false, token none)
57  ret void
58}
59
60; check that there is only one %struct.big_structure in the frame.
61; CHECK: %a.Frame = type { ptr, ptr, %"struct.task::promise_type", %struct.big_structure, i1 }
62
63declare token @llvm.coro.id(i32, ptr readnone, ptr nocapture readonly, ptr)
64declare i1 @llvm.coro.alloc(token) #3
65declare i64 @llvm.coro.size.i64() #5
66declare ptr @llvm.coro.begin(token, ptr writeonly) #3
67declare token @llvm.coro.save(ptr) #3
68declare ptr @llvm.coro.frame() #5
69declare i8 @llvm.coro.suspend(token, i1) #3
70declare ptr @llvm.coro.free(token, ptr nocapture readonly) #2
71declare i1 @llvm.coro.end(ptr, i1, token) #3
72declare void @llvm.lifetime.start.p0(i64, ptr nocapture) #4
73declare void @llvm.lifetime.end.p0(i64, ptr nocapture) #4
74