1; This testcase ensures that CFL AA answers queries soundly when callee tries 2; to return an unknown pointer 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@g = external global i32 8define i32* @return_unknown_callee(i32* %arg1, i32* %arg2) { 9 ret i32* @g 10} 11; CHECK-LABEL: Function: test_return_unknown 12; CHECK: NoAlias: i32* %a, i32* %b 13; CHECK: MayAlias: i32* %c, i32* %x 14; CHECK: NoAlias: i32* %a, i32* %c 15; CHECK: NoAlias: i32* %b, i32* %c 16define void @test_return_unknown(i32* %x) { 17 %a = alloca i32, align 4 18 %b = alloca i32, align 4 19 20 %c = call i32* @return_unknown_callee(i32* %a, i32* %b) 21 22 ret void 23} 24 25@g2 = external global i32* 26define i32** @return_unknown_callee2() { 27 ret i32** @g2 28} 29; CHECK-LABEL: Function: test_return_unknown2 30; CHECK: MayAlias: i32* %x, i32** %a 31; CHECK: MayAlias: i32* %b, i32* %x 32; CHECK: MayAlias: i32* %b, i32** %a 33define void @test_return_unknown2(i32* %x) { 34 %a = call i32** @return_unknown_callee2() 35 %b = load i32*, i32** %a 36 37 ret void 38}