1 ; This testcase ensures that CFL AA answers queries soundly when callee tries
2 ; to return the dereference of one of its parameters
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
7 define i32* @return_deref_arg_callee(i32** %arg1) {
8 %deref = load i32*, i32** %arg1
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
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)
26 define void @test_return_deref_arg() {
27 %a = alloca i32, align 4
28 %b = alloca i32, align 4
29 %p = alloca i32*, align 8
31 store i32* %a, i32** %p
32 %c = call i32* @return_deref_arg_callee(i32** %p)
34 %lp = load i32*, i32** %p