1; This testcase ensures that CFL AA answers queries soundly when callee tries
2; to return the multi-level dereference of one of its parameters
3
4; RUN: opt < %s -disable-basicaa -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
7define i32* @return_deref_arg_multilevel_callee(i32*** %arg1) {
8	%deref = load i32**, i32*** %arg1
9	%deref2 = load i32*, i32** %deref
10	ret i32* %deref2
11}
12; CHECK-LABEL: Function: test_return_deref_arg_multilevel
13; CHECK: NoAlias: i32* %a, i32* %b
14; CHECK: MayAlias: i32* %a, i32* %c
15; CHECK: NoAlias: i32* %b, i32* %c
16; CHECK: NoAlias: i32* %c, i32** %p
17; CHECK: NoAlias: i32* %c, i32*** %pp
18; CHECK: MayAlias: i32** %lpp, i32** %p
19; CHECK: NoAlias: i32** %lpp, i32*** %pp
20; CHECK: NoAlias: i32* %c, i32** %lpp
21; CHECK: MayAlias: i32* %a, i32* %lpp_deref
22; CHECK: NoAlias: i32* %b, i32* %lpp_deref
23; CHECK: NoAlias: i32* %lpp_deref, i32*** %pp
24; CHECK: MayAlias: i32* %a, i32* %lp
25; CHECK: NoAlias: i32* %b, i32* %lp
26; CHECK: NoAlias: i32* %lp, i32** %p
27; CHECK: NoAlias: i32* %lp, i32*** %pp
28; CHECK: MayAlias: i32* %c, i32* %lp
29; CHECK: NoAlias: i32* %lp, i32** %lpp
30; CHECK: MayAlias: i32* %lp, i32* %lpp_deref
31define void @test_return_deref_arg_multilevel() {
32  %a = alloca i32, align 4
33  %b = alloca i32, align 4
34  %p = alloca i32*, align 8
35  %pp = alloca i32**, align 8
36
37  store i32* %a, i32** %p
38  store i32** %p, i32*** %pp
39  %c = call i32* @return_deref_arg_multilevel_callee(i32*** %pp)
40
41  %lpp = load i32**, i32*** %pp
42  %lpp_deref = load i32*, i32** %lpp
43  %lp = load i32*, i32** %p
44
45  ret void
46}