| Krzysztof Pszeniczny | 2ba8fd4 | 2018-05-16 13:16:54 +0000 | [diff] [blame] | 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 |
| 18 | define 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 | |
| 35 | entry: |
| 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 | |
| 48 | declare i8* @llvm.launder.invariant.group.p0i8(i8*) |