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462cb3cd6c
If the gep is nusw (usually via inbounds) and the offset is non-negative, we can infer nuw. Proof: https://alive2.llvm.org/ce/z/ihztLy
122 lines
6.2 KiB
C++
122 lines
6.2 KiB
C++
// RUN: %clang_cc1 -emit-llvm -O1 -o - -fexceptions -triple=i386-pc-win32 %s | FileCheck %s
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struct S { char a; };
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struct V { virtual void f(); };
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struct A : virtual V {};
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struct B : S, virtual V {};
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struct T {};
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T* test0() { return dynamic_cast<T*>((B*)0); }
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// CHECK-LABEL: define dso_local noalias noundef ptr @"?test0@@YAPAUT@@XZ"()
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// CHECK: ret ptr null
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T* test1(V* x) { return &dynamic_cast<T&>(*x); }
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// CHECK-LABEL: define dso_local noundef ptr @"?test1@@YAPAUT@@PAUV@@@Z"(ptr noundef %x)
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// CHECK: [[CALL:%.*]] = tail call ptr @__RTDynamicCast(ptr %x, i32 0, ptr nonnull @"??_R0?AUV@@@8", ptr nonnull @"??_R0?AUT@@@8", i32 1)
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// CHECK-NEXT: ret ptr [[CALL]]
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T* test2(A* x) { return &dynamic_cast<T&>(*x); }
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// CHECK-LABEL: define dso_local noundef ptr @"?test2@@YAPAUT@@PAUA@@@Z"(ptr noundef %x)
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// CHECK: [[VBTBL:%.*]] = load ptr, ptr %x, align 4
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// CHECK-NEXT: [[VBOFFP:%.*]] = getelementptr inbounds nuw i8, ptr [[VBTBL]], i32 4
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// CHECK-NEXT: [[VBOFFS:%.*]] = load i32, ptr [[VBOFFP]], align 4
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// CHECK-NEXT: [[ADJ:%.*]] = getelementptr inbounds i8, ptr %x, i32 [[VBOFFS]]
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// CHECK-NEXT: [[CALL:%.*]] = tail call ptr @__RTDynamicCast(ptr nonnull [[ADJ]], i32 [[VBOFFS]], ptr nonnull @"??_R0?AUA@@@8", ptr nonnull @"??_R0?AUT@@@8", i32 1)
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// CHECK-NEXT: ret ptr [[CALL]]
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T* test3(B* x) { return &dynamic_cast<T&>(*x); }
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// CHECK-LABEL: define dso_local noundef ptr @"?test3@@YAPAUT@@PAUB@@@Z"(ptr noundef %x)
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// CHECK: [[VBPTR:%.*]] = getelementptr inbounds nuw i8, ptr %x, i32 4
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// CHECK-NEXT: [[VBTBL:%.*]] = load ptr, ptr [[VBPTR:%.*]], align 4
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// CHECK-NEXT: [[VBOFFP:%.*]] = getelementptr inbounds nuw i8, ptr [[VBTBL]], i32 4
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// CHECK-NEXT: [[VBOFFS:%.*]] = load i32, ptr [[VBOFFP]], align 4
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// CHECK-NEXT: [[DELTA:%.*]] = add nsw i32 [[VBOFFS]], 4
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// CHECK-NEXT: [[ADJ:%.*]] = getelementptr inbounds i8, ptr %x, i32 [[DELTA]]
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// CHECK-NEXT: [[CALL:%.*]] = tail call ptr @__RTDynamicCast(ptr [[ADJ]], i32 [[DELTA]], ptr nonnull @"??_R0?AUB@@@8", ptr nonnull @"??_R0?AUT@@@8", i32 1)
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// CHECK-NEXT: ret ptr [[CALL]]
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T* test4(V* x) { return dynamic_cast<T*>(x); }
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// CHECK-LABEL: define dso_local noundef ptr @"?test4@@YAPAUT@@PAUV@@@Z"(ptr noundef %x)
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// CHECK: [[CALL:%.*]] = tail call ptr @__RTDynamicCast(ptr %x, i32 0, ptr nonnull @"??_R0?AUV@@@8", ptr nonnull @"??_R0?AUT@@@8", i32 0)
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// CHECK-NEXT: ret ptr [[CALL]]
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T* test5(A* x) { return dynamic_cast<T*>(x); }
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// CHECK-LABEL: define dso_local noundef ptr @"?test5@@YAPAUT@@PAUA@@@Z"(ptr noundef %x)
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// CHECK: [[CHECK:%.*]] = icmp eq ptr %x, null
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// CHECK-NEXT: br i1 [[CHECK]]
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// CHECK: [[VBTBL:%.*]] = load ptr, ptr %x, align 4
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// CHECK-NEXT: [[VBOFFP:%.*]] = getelementptr inbounds nuw i8, ptr [[VBTBL]], i32 4
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// CHECK-NEXT: [[VBOFFS:%.*]] = load i32, ptr [[VBOFFP]], align 4
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// CHECK-NEXT: [[ADJ:%.*]] = getelementptr inbounds i8, ptr %x, i32 [[VBOFFS]]
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// CHECK-NEXT: [[CALL:%.*]] = tail call ptr @__RTDynamicCast(ptr nonnull [[ADJ]], i32 [[VBOFFS]], ptr {{.*}}@"??_R0?AUA@@@8", ptr {{.*}}@"??_R0?AUT@@@8", i32 0)
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// CHECK-NEXT: br label
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// CHECK: [[RET:%.*]] = phi ptr
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// CHECK-NEXT: ret ptr [[RET]]
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T* test6(B* x) { return dynamic_cast<T*>(x); }
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// CHECK-LABEL: define dso_local noundef ptr @"?test6@@YAPAUT@@PAUB@@@Z"(ptr noundef %x)
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// CHECK: [[CHECK:%.*]] = icmp eq ptr %x, null
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// CHECK-NEXT: br i1 [[CHECK]]
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// CHECK: [[VBPTR:%.*]] = getelementptr inbounds nuw i8, ptr %x, i32 4
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// CHECK-NEXT: [[VBTBL:%.*]] = load ptr, ptr [[VBPTR]], align 4
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// CHECK-NEXT: [[VBOFFP:%.*]] = getelementptr inbounds nuw i8, ptr [[VBTBL]], i32 4
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// CHECK-NEXT: [[VBOFFS:%.*]] = load i32, ptr [[VBOFFP]], align 4
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// CHECK-NEXT: [[DELTA:%.*]] = add nsw i32 [[VBOFFS]], 4
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// CHECK-NEXT: [[ADJ:%.*]] = getelementptr inbounds i8, ptr %x, i32 [[DELTA]]
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// CHECK-NEXT: [[CALL:%.*]] = tail call ptr @__RTDynamicCast(ptr nonnull [[ADJ]], i32 [[DELTA]], ptr {{.*}}@"??_R0?AUB@@@8", ptr {{.*}}@"??_R0?AUT@@@8", i32 0)
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// CHECK-NEXT: br label
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// CHECK: [[RET:%.*]] = phi ptr
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// CHECK-NEXT: ret ptr [[RET]]
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void* test7(V* x) { return dynamic_cast<void*>(x); }
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// CHECK-LABEL: define dso_local noundef ptr @"?test7@@YAPAXPAUV@@@Z"(ptr noundef %x)
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// CHECK: [[RET:%.*]] = tail call ptr @__RTCastToVoid(ptr %x)
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// CHECK-NEXT: ret ptr [[RET]]
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void* test8(A* x) { return dynamic_cast<void*>(x); }
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// CHECK-LABEL: define dso_local noundef ptr @"?test8@@YAPAXPAUA@@@Z"(ptr noundef %x)
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// CHECK: [[CHECK:%.*]] = icmp eq ptr %x, null
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// CHECK-NEXT: br i1 [[CHECK]]
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// CHECK: [[VBTBL:%.*]] = load ptr, ptr %x, align 4
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// CHECK-NEXT: [[VBOFFP:%.*]] = getelementptr inbounds nuw i8, ptr [[VBTBL]], i32 4
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// CHECK-NEXT: [[VBOFFS:%.*]] = load i32, ptr [[VBOFFP]], align 4
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// CHECK-NEXT: [[ADJ:%.*]] = getelementptr inbounds i8, ptr %x, i32 [[VBOFFS]]
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// CHECK-NEXT: [[RES:%.*]] = tail call ptr @__RTCastToVoid(ptr nonnull [[ADJ]])
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// CHECK-NEXT: br label
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// CHECK: [[RET:%.*]] = phi ptr
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// CHECK-NEXT: ret ptr [[RET]]
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void* test9(B* x) { return dynamic_cast<void*>(x); }
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// CHECK-LABEL: define dso_local noundef ptr @"?test9@@YAPAXPAUB@@@Z"(ptr noundef %x)
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// CHECK: [[CHECK:%.*]] = icmp eq ptr %x, null
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// CHECK-NEXT: br i1 [[CHECK]]
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// CHECK: [[VBPTR:%.*]] = getelementptr inbounds nuw i8, ptr %x, i32 4
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// CHECK-NEXT: [[VBTBL:%.*]] = load ptr, ptr [[VBPTR]], align 4
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// CHECK-NEXT: [[VBOFFP:%.*]] = getelementptr inbounds nuw i8, ptr [[VBTBL]], i32 4
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// CHECK-NEXT: [[VBOFFS:%.*]] = load i32, ptr [[VBOFFP]], align 4
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// CHECK-NEXT: [[BASE:%.*]] = getelementptr i8, ptr %x, i32 [[VBOFFS]]
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// CHECK-NEXT: [[ADJ:%.*]] = getelementptr i8, ptr [[BASE]], i32 4
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// CHECK-NEXT: [[CALL:%.*]] = tail call ptr @__RTCastToVoid(ptr [[ADJ]])
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// CHECK-NEXT: br label
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// CHECK: [[RET:%.*]] = phi ptr
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// CHECK-NEXT: ret ptr [[RET]]
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namespace PR25606 {
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struct Cleanup {
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~Cleanup();
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};
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struct S1 { virtual ~S1(); };
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struct S2 : virtual S1 {};
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struct S3 : S2 {};
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S3 *f(S2 &s) {
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Cleanup c;
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return dynamic_cast<S3 *>(&s);
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}
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// CHECK-LABEL: define dso_local noundef ptr @"?f@PR25606@@YAPAUS3@1@AAUS2@1@@Z"(
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// CHECK: [[CALL:%.*]] = invoke ptr @__RTDynamicCast
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// CHECK: call x86_thiscallcc void @"??1Cleanup@PR25606@@QAE@XZ"(
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// CHECK: ret ptr [[CALL]]
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}
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