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 -disable-basicaa -cfl-anders-aa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
5; RUN: opt < %s -aa-pipeline=cfl-anders-aa -passes=aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
6
7declare noalias i8* @malloc(i64)
8
9define i32*** @return_ref_arg_multilevel_callee(i32* %arg1) {
10	%ptr = call noalias i8* @malloc(i64 8)
11	%ptr_cast = bitcast i8* %ptr to i32***
12  %ptr2 = call noalias i8* @malloc(i64 8)
13  %ptr_cast2 = bitcast i8* %ptr2 to i32**
14	store i32* %arg1, i32** %ptr_cast2
15  store i32** %ptr_cast2, i32*** %ptr_cast
16	ret i32*** %ptr_cast
17}
18; CHECK-LABEL: Function: test_return_ref_arg_multilevel
19; CHECK: NoAlias: i32* %a, i32*** %b
20; CHECK: NoAlias: i32** %p, i32*** %b
21; CHECK: NoAlias: i32*** %b, i32*** %pp
22; CHECK: NoAlias: i32* %a, i32** %lb
23; CHECK: NoAlias: i32** %lb, i32** %p
24; CHECK: NoAlias: i32** %lb, i32*** %pp
25; CHECK: NoAlias: i32** %lb, i32*** %b
26; CHECK: MayAlias: i32* %a, i32* %lb_deref
27; CHECK: NoAlias: i32* %lb_deref, i32** %lpp
28; CHECK: MayAlias: i32* %lb_deref, i32* %lpp_deref
29; CHECK: NoAlias: i32* %lpp_deref, i32** %lpp
30; CHECK: MayAlias: i32* %lb_deref, i32* %lp
31; CHECK: NoAlias: i32* %lp, i32** %lpp
32; CHECK: MayAlias: i32* %lp, i32* %lpp_deref
33
34; Temporarily disable modref checks
35; Just Mod: Ptr: i32*** %b <-> %b = call i32*** @return_ref_arg_multilevel_callee(i32* %a)
36; Just Mod: Ptr: i32** %lb <-> %b = call i32*** @return_ref_arg_multilevel_callee(i32* %a)
37define void @test_return_ref_arg_multilevel() {
38  %a = alloca i32, align 4
39  %p = alloca i32*, align 8
40  %pp = alloca i32**, align 8
41
42  store i32* %a, i32** %p
43  store i32** %p, i32*** %pp
44  %b = call i32*** @return_ref_arg_multilevel_callee(i32* %a)
45
46  %lb = load i32**, i32*** %b
47  %lb_deref = load i32*, i32** %lb
48  %lpp = load i32**, i32*** %pp
49  %lpp_deref = load i32*, i32** %lpp
50  %lp = load i32*, i32** %p
51
52  ret void
53}