1; RUN: opt < %s -aa-pipeline=basic-aa -passes=aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s 2; RUN: opt < %s -aa-pipeline=basic-aa -passes=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 <{ ptr, i8 }> 15 16; CHECK: testLaunderInvariantGroupIsNotEscapeSource 17; CHECK-GVN: testLaunderInvariantGroupIsNotEscapeSource 18define i8 @testLaunderInvariantGroupIsNotEscapeSource() { 19; CHECK-DAG: MustAlias: i8* %a, %struct.A* %a 20; CHECK-DAG: PartialAlias (off 8): %struct.A* %a, i8* %n 21; CHECK-DAG: NoAlias: i8* %a, i8* %n 22; CHECK-DAG: MustAlias: %struct.A* %a, i8* %a.laundered 23; CHECK-DAG: MustAlias: i8* %a, i8* %a.laundered 24; CHECK-DAG: NoAlias: i8* %a.laundered, i8* %n 25; CHECK-DAG: PartialAlias (off 8): %struct.A* %a, i8* %n.laundered 26; CHECK-DAG: NoAlias: i8* %a, 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 ptr @llvm.launder.invariant.group.p0(ptr nonnull %a) 30; CHECK-DAG: NoModRef: Ptr: i8* %a <-> %a.laundered = call ptr @llvm.launder.invariant.group.p0(ptr nonnull %a) 31; CHECK-DAG: NoModRef: Ptr: i8* %n <-> %a.laundered = call ptr @llvm.launder.invariant.group.p0(ptr nonnull %a) 32; CHECK-DAG: NoModRef: Ptr: i8* %a.laundered <-> %a.laundered = call ptr @llvm.launder.invariant.group.p0(ptr nonnull %a) 33; CHECK-DAG: NoModRef: Ptr: i8* %n.laundered <-> %a.laundered = call ptr @llvm.launder.invariant.group.p0(ptr nonnull %a) 34 35entry: 36 %a = alloca %struct.A, align 8 37 load %struct.A, ptr %a 38 load i8, ptr %a 39 %n = getelementptr inbounds %struct.A, ptr %a, i64 0, i32 1 40 store i8 42, ptr %n 41 %a.laundered = call ptr @llvm.launder.invariant.group.p0(ptr nonnull %a) 42 load i8, ptr %a.laundered 43 %n.laundered = getelementptr inbounds i8, ptr %a.laundered, i64 8 44 %v = load i8, ptr %n.laundered 45; make sure that the load from %n.laundered to %v aliases the store of 42 to %n 46; CHECK-GVN: ret i8 42 47 ret i8 %v 48} 49 50declare ptr @llvm.launder.invariant.group.p0(ptr) 51