1 ; This testcase ensures that CFL AA answers queries soundly when callee tries 2 ; to return the multi-level 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_multilevel_callee(i32* %arg1) { 10 %ptr = call noalias i8* @malloc(i64 8) 11 %ptr_cast = bitcast i8* %ptr to i32*** 12 %ptr2 = call noalias i8* @malloc(i64 8) 13 %ptr_cast2 = bitcast i8* %ptr2 to i32** 14 store i32* %arg1, i32** %ptr_cast2 15 store i32** %ptr_cast2, i32*** %ptr_cast 16 ret i32*** %ptr_cast 17 } 18 ; CHECK-LABEL: Function: test_return_ref_arg_multilevel 19 ; CHECK: NoAlias: i32* %a, i32*** %b 20 ; CHECK: NoAlias: i32** %p, i32*** %b 21 ; CHECK: NoAlias: i32* %a, i32** %lb 22 ; CHECK: NoAlias: i32** %lb, i32*** %pp 23 ; CHECK: NoAlias: i32** %lb, i32*** %b 24 ; CHECK: MayAlias: i32* %a, i32* %lb_deref 25 ; CHECK: NoAlias: i32* %lb_deref, i32** %lpp 26 ; CHECK: MayAlias: i32* %lb_deref, i32* %lpp_deref 27 ; CHECK: NoAlias: i32* %lpp_deref, i32** %lpp 28 ; CHECK: MayAlias: i32* %lb_deref, i32* %lp 29 ; CHECK: NoAlias: i32* %lp, i32** %lpp 30 ; CHECK: MayAlias: i32* %lp, i32* %lpp_deref 31 32 ; We could've proven the following facts if the analysis were inclusion-based: 33 ; NoAlias: i32*** %b, i32*** %pp 34 ; NoAlias: i32** %lb, i32** %p 35 define void @test_return_ref_arg_multilevel() { 36 %a = alloca i32, align 4 37 %p = alloca i32*, align 8 38 %pp = alloca i32**, align 8 39 40 store i32* %a, i32** %p 41 store i32** %p, i32*** %pp 42 %b = call i32*** @return_ref_arg_multilevel_callee(i32* %a) 43 44 %lb = load i32**, i32*** %b 45 %lb_deref = load i32*, i32** %lb 46 %lpp = load i32**, i32*** %pp 47 %lpp_deref = load i32*, i32** %lpp 48 %lp = load i32*, i32** %p 49 50 ret void 51 }
