1; RUN: llc -mtriple=x86_64 < %s
2
3declare i8* @llvm_gc_allocate(i32)
4declare void @llvm_gc_initialize(i32)
5
6declare void @llvm.gcroot(i8**, i8*)
7declare void @llvm.gcwrite(i8*, i8*, i8**)
8
9define i32 @main() gc "shadow-stack" {
10entry:
11	%A = alloca i8*
12	%B = alloca i8**
13
14	call void @llvm_gc_initialize(i32 1048576)  ; Start with 1MB heap
15
16        ;; void *A;
17	call void @llvm.gcroot(i8** %A, i8* null)
18
19        ;; A = gcalloc(10);
20	%Aptr = call i8* @llvm_gc_allocate(i32 10)
21	store i8* %Aptr, i8** %A
22
23        ;; void **B;
24	%tmp.1 = bitcast i8*** %B to i8**
25	call void @llvm.gcroot(i8** %tmp.1, i8* null)
26
27	;; B = gcalloc(4);
28	%B.upgrd.1 = call i8* @llvm_gc_allocate(i32 8)
29	%tmp.2 = bitcast i8* %B.upgrd.1 to i8**
30	store i8** %tmp.2, i8*** %B
31
32	;; *B = A;
33	%B.1 = load i8**, i8*** %B
34	%A.1 = load i8*, i8** %A
35	call void @llvm.gcwrite(i8* %A.1, i8* %B.upgrd.1, i8** %B.1)
36
37	br label %AllocLoop
38
39AllocLoop:
40	%i = phi i32 [ 0, %entry ], [ %indvar.next, %AllocLoop ]
41        ;; Allocated mem: allocated memory is immediately dead.
42	call i8* @llvm_gc_allocate(i32 100)
43
44	%indvar.next = add i32 %i, 1
45	%exitcond = icmp eq i32 %indvar.next, 10000000
46	br i1 %exitcond, label %Exit, label %AllocLoop
47
48Exit:
49	ret i32 0
50}
51
52declare void @__main()
53