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 -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 6 7 declare noalias i8* @malloc(i64) 8 9 define i32** @return_ref_arg_callee(i32* %arg1) { 10 %ptr = call noalias i8* @malloc(i64 8) 11 %ptr_cast = bitcast i8* %ptr to i32** 12 store i32* %arg1, i32** %ptr_cast 13 ret i32** %ptr_cast 14 } 15 ; CHECK-LABEL: Function: test_return_ref_arg 16 ; CHECK: MayAlias: i32* %a, i32* %lb 17 ; CHECK: NoAlias: i32* %lb, i32** %p 18 ; CHECK: NoAlias: i32* %lb, i32** %b 19 ; CHECK: NoAlias: i32* %lp, i32** %p 20 ; CHECK: NoAlias: i32* %lp, i32** %b 21 ; CHECK: MayAlias: i32* %lb, i32* %lp 22 23 ; We could've proven the following facts if the analysis were inclusion-based: 24 ; NoAlias: i32** %b, i32** %p 25 define void @test_return_ref_arg() { 26 %a = alloca i32, align 4 27 %p = alloca i32*, align 8 28 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 35 ret void 36 }
