| ; RUN: opt < %s -basicaa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s |
| ; RUN: opt < %s -basicaa -gvn -S | FileCheck -check-prefix=CHECK-GVN %s |
| |
| ; The input *.ll had been adapted from bug 37458: |
| ; |
| ; struct A { virtual void f(); int n; }; |
| ; |
| ; int h() { |
| ; A a; |
| ; a.n = 42; |
| ; return __builtin_launder(&a)->n; |
| ; } |
| |
| %struct.A = type <{ i8*, i8 }> |
| |
| ; CHECK: testLaunderInvariantGroupIsNotEscapeSource |
| ; CHECK-GVN: testLaunderInvariantGroupIsNotEscapeSource |
| define i8 @testLaunderInvariantGroupIsNotEscapeSource() { |
| ; CHECK-DAG: MustAlias: %struct.A* %a, i8* %a.bitcast |
| ; CHECK-DAG: PartialAlias: %struct.A* %a, i8* %n |
| ; CHECK-DAG: NoAlias: i8* %a.bitcast, i8* %n |
| ; CHECK-DAG: MustAlias: %struct.A* %a, i8* %a.laundered |
| ; CHECK-DAG: MustAlias: i8* %a.bitcast, i8* %a.laundered |
| ; CHECK-DAG: NoAlias: i8* %a.laundered, i8* %n |
| ; CHECK-DAG: PartialAlias: %struct.A* %a, i8* %n.laundered |
| ; CHECK-DAG: NoAlias: i8* %a.bitcast, i8* %n.laundered |
| ; CHECK-DAG: MustAlias: i8* %n, i8* %n.laundered |
| ; CHECK-DAG: NoAlias: i8* %a.laundered, i8* %n.laundered |
| ; CHECK-DAG: NoModRef: Ptr: %struct.A* %a <-> %a.laundered = call i8* @llvm.launder.invariant.group.p0i8(i8* nonnull %a.bitcast) |
| ; CHECK-DAG: NoModRef: Ptr: i8* %a.bitcast <-> %a.laundered = call i8* @llvm.launder.invariant.group.p0i8(i8* nonnull %a.bitcast) |
| ; CHECK-DAG: NoModRef: Ptr: i8* %n <-> %a.laundered = call i8* @llvm.launder.invariant.group.p0i8(i8* nonnull %a.bitcast) |
| ; CHECK-DAG: NoModRef: Ptr: i8* %a.laundered <-> %a.laundered = call i8* @llvm.launder.invariant.group.p0i8(i8* nonnull %a.bitcast) |
| ; CHECK-DAG: NoModRef: Ptr: i8* %n.laundered <-> %a.laundered = call i8* @llvm.launder.invariant.group.p0i8(i8* nonnull %a.bitcast) |
| |
| entry: |
| %a = alloca %struct.A, align 8 |
| %a.bitcast = bitcast %struct.A* %a to i8* |
| %n = getelementptr inbounds %struct.A, %struct.A* %a, i64 0, i32 1 |
| store i8 42, i8* %n |
| %a.laundered = call i8* @llvm.launder.invariant.group.p0i8(i8* nonnull %a.bitcast) |
| %n.laundered = getelementptr inbounds i8, i8* %a.laundered, i64 8 |
| %v = load i8, i8* %n.laundered |
| ; make sure that the load from %n.laundered to %v aliases the store of 42 to %n |
| ; CHECK-GVN: ret i8 42 |
| ret i8 %v |
| } |
| |
| declare i8* @llvm.launder.invariant.group.p0i8(i8*) |