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-basic-aa -cfl-steens-aa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
5; RUN: opt < %s -aa-pipeline=cfl-steens-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* %a, i32** %lb
22; CHECK: NoAlias: i32** %lb, i32*** %pp
23; CHECK: NoAlias: i32** %lb, i32*** %b
24; CHECK: MayAlias: i32* %a, i32* %lb_deref
25; CHECK: NoAlias: i32* %lb_deref, i32** %lpp
26; CHECK: MayAlias: i32* %lb_deref, i32* %lpp_deref
27; CHECK: NoAlias: i32* %lpp_deref, i32** %lpp
28; CHECK: MayAlias: i32* %lb_deref, i32* %lp
29; CHECK: NoAlias: i32* %lp, i32** %lpp
30; CHECK: MayAlias: i32* %lp, i32* %lpp_deref
31
32; We could've proven the following facts if the analysis were inclusion-based:
33; NoAlias: i32*** %b, i32*** %pp
34; NoAlias: i32** %lb, i32** %p
35define void @test_return_ref_arg_multilevel() {
36  %a = alloca i32, align 4
37  %p = alloca i32*, align 8
38  %pp = alloca i32**, align 8
39
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
50  ret void
51}