1 // RUN: %clang_cc1 -emit-llvm -o - %s | FileCheck %s
2
3 struct A { int x; A(int); ~A(); };
f()4 A f() { return A(0); }
5 // CHECK: define void @_Z1fv
6 // CHECK: call {{.*}} @_ZN1AC1Ei
7 // CHECK-NEXT: ret void
8
9 // Verify that we do not elide copies when constructing a base class.
10 namespace no_elide_base {
11 struct Base {
12 Base(const Base&);
13 ~Base();
14 };
15
16 struct Other {
17 operator Base() const;
18 };
19
20 struct Derived : public virtual Base {
21 Derived(const Other &O);
22 };
23
24 // CHECK: define {{.*}} @_ZN13no_elide_base7DerivedC1ERKNS_5OtherE(%"struct.no_elide_base::Derived"* %this, %"struct.no_elide_base::Other"* %O) unnamed_addr
Derived(const Other & O)25 Derived::Derived(const Other &O)
26 // CHECK: call {{.*}} @_ZNK13no_elide_base5OthercvNS_4BaseEEv
27 // CHECK: call {{.*}} @_ZN13no_elide_base4BaseC2ERKS0_
28 // CHECK: call {{.*}} @_ZN13no_elide_base4BaseD1Ev
29 : Base(O)
30 {
31 // CHECK: ret
32 }
33 }
34
35 // PR8683.
36
37 namespace PR8683 {
38
39 struct A {
40 A();
41 A(const A&);
42 A& operator=(const A&);
43 };
44
45 struct B {
46 A a;
47 };
48
f()49 void f() {
50 // Verify that we don't mark the copy constructor in this expression as elidable.
51 // CHECK: call {{.*}} @_ZN6PR86831AC1ERKS0_
52 A a = (B().a);
53 }
54
55 }
56