interproc-ret-deref-arg.ll
1.43 KB
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; This testcase ensures that CFL AA answers queries soundly when callee tries
; to return the dereference of one of its parameters
; RUN: opt < %s -disable-basic-aa -cfl-anders-aa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
; RUN: opt < %s -aa-pipeline=cfl-anders-aa -passes=aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
define i32* @return_deref_arg_callee(i32** %arg1) {
%deref = load i32*, i32** %arg1
ret i32* %deref
}
; CHECK-LABEL: Function: test_return_deref_arg
; CHECK: NoAlias: i32* %a, i32* %b
; CHECK: MayAlias: i32* %a, i32* %c
; CHECK: NoAlias: i32* %b, i32* %c
; CHECK: MayAlias: i32* %a, i32* %lp
; CHECK: NoAlias: i32* %b, i32* %lp
; CHECK: NoAlias: i32* %lp, i32** %p
; CHECK: MayAlias: i32* %c, i32* %lp
; Temporarily disable modref checks
; NoModRef: Ptr: i32* %a <-> %c = call i32* @return_deref_arg_callee(i32** %p)
; NoModRef: Ptr: i32* %b <-> %c = call i32* @return_deref_arg_callee(i32** %p)
; Just Ref: Ptr: i32** %p <-> %c = call i32* @return_deref_arg_callee(i32** %p)
; NoModRef: Ptr: i32* %c <-> %c = call i32* @return_deref_arg_callee(i32** %p)
; NoModRef: Ptr: i32* %lp <-> %c = call i32* @return_deref_arg_callee(i32** %p)
define void @test_return_deref_arg() {
%a = alloca i32, align 4
%b = alloca i32, align 4
%p = alloca i32*, align 8
store i32* %a, i32** %p
%c = call i32* @return_deref_arg_callee(i32** %p)
%lp = load i32*, i32** %p
ret void
}