1; This testcase ensures that CFL AA answers queries soundly when callee tries
2; to return the multi-level reference of one of its parameters
3
4; RUN: opt < %s -aa-pipeline=cfl-steens-aa -passes=aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
5
6declare noalias i8* @malloc(i64)
7
8define i32*** @return_ref_arg_multilevel_callee(i32* %arg1) {
9	%ptr = call noalias i8* @malloc(i64 8)
10	%ptr_cast = bitcast i8* %ptr to i32***
11  %ptr2 = call noalias i8* @malloc(i64 8)
12  %ptr_cast2 = bitcast i8* %ptr2 to i32**
13	store i32* %arg1, i32** %ptr_cast2
14  store i32** %ptr_cast2, i32*** %ptr_cast
15	ret i32*** %ptr_cast
16}
17; CHECK-LABEL: Function: test_return_ref_arg_multilevel
18; CHECK-DAG: NoAlias: i32* %a, i32*** %b
19; CHECK-DAG: NoAlias: i32*** %b, i32** %p
20; CHECK-DAG: NoAlias: i32* %a, i32** %lb
21; CHECK-DAG: NoAlias: i32** %lb, i32*** %pp
22; CHECK-DAG: NoAlias: i32*** %b, i32** %lb
23; CHECK-DAG: MayAlias: i32* %a, i32* %lb_deref
24; CHECK-DAG: NoAlias: i32* %lb_deref, i32** %lpp
25; CHECK-DAG: MayAlias: i32* %lb_deref, i32* %lpp_deref
26; CHECK-DAG: NoAlias: i32** %lpp, i32* %lpp_deref
27; CHECK-DAG: MayAlias: i32* %lb_deref, i32* %lp
28; CHECK-DAG: NoAlias: i32* %lp, i32** %lpp
29; CHECK-DAG: MayAlias: i32* %lp, i32* %lpp_deref
30
31; We could've proven the following facts if the analysis were inclusion-based:
32; NoAlias: i32*** %b, i32*** %pp
33; NoAlias: i32** %lb, i32** %p
34define void @test_return_ref_arg_multilevel() {
35  %a = alloca i32, align 4
36  %p = alloca i32*, align 8
37  %pp = alloca i32**, align 8
38
39  load i32, i32* %a
40  store i32* %a, i32** %p
41  store i32** %p, i32*** %pp
42  %b = call i32*** @return_ref_arg_multilevel_callee(i32* %a)
43
44  %lb = load i32**, i32*** %b
45  %lb_deref = load i32*, i32** %lb
46  %lpp = load i32**, i32*** %pp
47  %lpp_deref = load i32*, i32** %lpp
48  %lp = load i32*, i32** %p
49  load i32, i32* %lb_deref
50  load i32, i32* %lpp_deref
51  load i32, i32* %lp
52
53  ret void
54}
55