1; This testcase ensures that CFL AA answers queries soundly when callee tries
2; to return the dereference 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
7define i32* @return_deref_arg_callee(i32** %arg1) {
8  %deref = load i32*, i32** %arg1
9  ret i32* %deref
10}
11; CHECK-LABEL: Function: test_return_deref_arg
12; CHECK: NoAlias: i32* %a, i32* %b
13; CHECK: MayAlias: i32* %a, i32* %c
14; CHECK: NoAlias: i32* %b, i32* %c
15; CHECK: MayAlias: i32* %a, i32* %lp
16; CHECK: NoAlias: i32* %b, i32* %lp
17; CHECK: NoAlias: i32* %lp, i32** %p
18; CHECK: MayAlias: i32* %c, i32* %lp
19
20; Temporarily disable modref checks
21; NoModRef: Ptr: i32* %a <-> %c = call i32* @return_deref_arg_callee(i32** %p)
22; NoModRef: Ptr: i32* %b <-> %c = call i32* @return_deref_arg_callee(i32** %p)
23; Just Ref: Ptr: i32** %p <-> %c = call i32* @return_deref_arg_callee(i32** %p)
24; NoModRef: Ptr: i32* %c <-> %c = call i32* @return_deref_arg_callee(i32** %p)
25; NoModRef: Ptr: i32* %lp <-> %c = call i32* @return_deref_arg_callee(i32** %p)
26define void @test_return_deref_arg() {
27  %a = alloca i32, align 4
28  %b = alloca i32, align 4
29  %p = alloca i32*, align 8
30
31  store i32* %a, i32** %p
32  %c = call i32* @return_deref_arg_callee(i32** %p)
33
34  %lp = load i32*, i32** %p
35
36  ret void
37}