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1; RUN: opt < %s -basicaa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
2; RUN: opt < %s -basicaa -gvn -S | FileCheck -check-prefix=CHECK-GVN %s
3
4; The input *.ll had been adapted from bug 37458:
5;
6; struct A { virtual void f(); int n; };
7;
8; int h() {
9;     A a;
10;     a.n = 42;
11;     return __builtin_launder(&a)->n;
12; }
13
14%struct.A = type <{ i8*, i8 }>
15
16; CHECK: testLaunderInvariantGroupIsNotEscapeSource
17; CHECK-GVN: testLaunderInvariantGroupIsNotEscapeSource
18define i8 @testLaunderInvariantGroupIsNotEscapeSource() {
19; CHECK-DAG: MustAlias: %struct.A* %a, i8* %a.bitcast
20; CHECK-DAG: PartialAlias: %struct.A* %a, i8* %n
21; CHECK-DAG: NoAlias: i8* %a.bitcast, i8* %n
22; CHECK-DAG: MustAlias: %struct.A* %a, i8* %a.laundered
23; CHECK-DAG: MustAlias: i8* %a.bitcast, i8* %a.laundered
24; CHECK-DAG: NoAlias: i8* %a.laundered, i8* %n
25; CHECK-DAG: PartialAlias: %struct.A* %a, i8* %n.laundered
26; CHECK-DAG: NoAlias: i8* %a.bitcast, i8* %n.laundered
27; CHECK-DAG: MustAlias: i8* %n, i8* %n.laundered
28; CHECK-DAG: NoAlias: i8* %a.laundered, i8* %n.laundered
29; CHECK-DAG: NoModRef: Ptr: %struct.A* %a <-> %a.laundered = call i8* @llvm.launder.invariant.group.p0i8(i8* nonnull %a.bitcast)
30; CHECK-DAG: NoModRef: Ptr: i8* %a.bitcast <-> %a.laundered = call i8* @llvm.launder.invariant.group.p0i8(i8* nonnull %a.bitcast)
31; CHECK-DAG: NoModRef: Ptr: i8* %n <-> %a.laundered = call i8* @llvm.launder.invariant.group.p0i8(i8* nonnull %a.bitcast)
32; CHECK-DAG: NoModRef: Ptr: i8* %a.laundered <-> %a.laundered = call i8* @llvm.launder.invariant.group.p0i8(i8* nonnull %a.bitcast)
33; CHECK-DAG: NoModRef: Ptr: i8* %n.laundered <-> %a.laundered = call i8* @llvm.launder.invariant.group.p0i8(i8* nonnull %a.bitcast)
34
35entry:
36  %a = alloca %struct.A, align 8
37  %a.bitcast = bitcast %struct.A* %a to i8*
38  %n = getelementptr inbounds %struct.A, %struct.A* %a, i64 0, i32 1
39  store i8 42, i8* %n
40  %a.laundered = call i8* @llvm.launder.invariant.group.p0i8(i8* nonnull %a.bitcast)
41  %n.laundered = getelementptr inbounds i8, i8* %a.laundered, i64 8
42  %v = load i8, i8* %n.laundered
43; make sure that the load from %n.laundered to %v aliases the store of 42 to %n
44; CHECK-GVN: ret i8 42
45  ret i8 %v
46}
47
48declare i8* @llvm.launder.invariant.group.p0i8(i8*)
49