1; This testcase ensures that CFL AA answers queries soundly when callee tries
2; to return the 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_callee(i32* %arg1) {
9	%ptr = call noalias i8* @malloc(i64 8)
10	%ptr_cast = bitcast i8* %ptr to i32**
11	store i32* %arg1, i32** %ptr_cast
12	ret i32** %ptr_cast
13}
14; CHECK-LABEL: Function: test_return_ref_arg
15; CHECK: MayAlias: i32* %a, i32* %lb
16; CHECK: NoAlias: i32* %lb, i32** %p
17; CHECK: NoAlias: i32** %b, i32* %lb
18; CHECK: NoAlias: i32* %lp, i32** %p
19; CHECK: NoAlias: i32** %b, i32* %lp
20; CHECK: MayAlias: i32* %lb, i32* %lp
21
22; We could've proven the following facts if the analysis were inclusion-based:
23; NoAlias: i32** %b, i32** %p
24define void @test_return_ref_arg() {
25  %a = alloca i32, align 4
26  %p = alloca i32*, align 8
27
28  load i32, i32* %a
29  store i32* %a, i32** %p
30  %b = call i32** @return_ref_arg_callee(i32* %a)
31
32  %lb = load i32*, i32** %b
33  %lp = load i32*, i32** %p
34  load i32, i32* %lb
35  load i32, i32* %lp
36
37  ret void
38}
39