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-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
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
19 define void @test_return_deref_arg() {
20 %a = alloca i32, align 4
21 %b = alloca i32, align 4
22 %p = alloca i32*, align 8
24 store i32* %a, i32** %p
25 %c = call i32* @return_deref_arg_callee(i32** %p)
27 %lp = load i32*, i32** %p