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-anders-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: NoAlias: i32** %b, i32** %p
16; CHECK: MayAlias: i32* %a, i32* %lb
17; CHECK: NoAlias: i32* %lb, i32** %p
18; CHECK: NoAlias: i32** %b, i32* %lb
19; CHECK: NoAlias: i32* %lp, i32** %p
20; CHECK: NoAlias: i32** %b, i32* %lp
21; CHECK: MayAlias: i32* %lb, i32* %lp
22
23; Temporarily disable modref checks
24; Just Mod: Ptr: i32** %b <-> %b = call i32** @return_ref_arg_callee(i32* %a)
25define void @test_return_ref_arg() {
26  %a = alloca i32, align 4
27  %p = alloca i32*, align 8
28
29  load i32, i32* %a
30  store i32* %a, i32** %p
31  %b = call i32** @return_ref_arg_callee(i32* %a)
32
33  %lb = load i32*, i32** %b
34  %lp = load i32*, i32** %p
35  load i32, i32* %lb
36  load i32, i32* %lp
37
38  ret void
39}
40