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      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
      8 define 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
     16 define 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*
     26 define 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
     33 define void @test_return_unknown2(i32* %x) {
     34   %a = call i32** @return_unknown_callee2()
     35   %b = load i32*, i32** %a
     36 
     37   ret void
     38 }