1 // RUN: %clang_cc1 -triple=x86_64-linux-gnu -emit-llvm -o - -std=c++17 %s | FileCheck %s --implicit-check-not=@_ZSt4move
2
3 namespace std {
move(T & val)4 template<typename T> constexpr T &&move(T &val) { return static_cast<T&&>(val); }
5 template<typename T> constexpr T &&move_if_noexcept(T &val);
6 template<typename T> constexpr T &&forward(T &val);
7 template<typename U, typename T> constexpr T &&forward_like(T &&val);
8 template<typename T> constexpr const T &as_const(T &val);
9
10 // Not the builtin.
11 template<typename T, typename U> T move(U source, U source_end, T dest);
12 }
13
14 class T {};
15 extern "C" void take(T &&);
16 extern "C" void take_lval(const T &);
17
18 T a;
19
20 // Check emission of a constant-evaluated call.
21 // CHECK-DAG: @move_a = constant ptr @a
22 T &&move_a = std::move(a);
23 // CHECK-DAG: @move_if_noexcept_a = constant ptr @a
24 T &&move_if_noexcept_a = std::move_if_noexcept(a);
25 // CHECK-DAG: @forward_a = constant ptr @a
26 T &forward_a = std::forward<T&>(a);
27 // CHECK-DAG: @forward_like_a = constant ptr @a
28 T &forward_like_a = std::forward_like<int&>(a);
29
30 // Check emission of a non-constant call.
31 // CHECK-LABEL: define {{.*}} void @test
test(T & t)32 extern "C" void test(T &t) {
33 // CHECK: store ptr %{{.*}}, ptr %[[T_REF:[^,]*]]
34 // CHECK: %0 = load ptr, ptr %[[T_REF]]
35 // CHECK: call void @take(ptr {{.*}} %0)
36 take(std::move(t));
37 // CHECK: %1 = load ptr, ptr %[[T_REF]]
38 // CHECK: call void @take(ptr {{.*}} %1)
39 take(std::move_if_noexcept(t));
40 // CHECK: %2 = load ptr, ptr %[[T_REF]]
41 // CHECK: call void @take(ptr {{.*}} %2)
42 take(std::forward<T&&>(t));
43 // CHECK: %3 = load ptr, ptr %[[T_REF]]
44 // CHECK: call void @take_lval(ptr {{.*}} %3)
45 take_lval(std::forward_like<int&>(t));
46 // CHECK: %4 = load ptr, ptr %[[T_REF]]
47 // CHECK: call void @take_lval(ptr {{.*}} %4)
48 take_lval(std::as_const<T&&>(t));
49
50 // CHECK: call {{.*}} @_ZSt4moveI1TS0_ET_T0_S2_S1_
51 std::move(t, t, t);
52 }
53
54 // CHECK: declare {{.*}} @_ZSt4moveI1TS0_ET_T0_S2_S1_
55
56 // Check that we instantiate and emit if the address is taken.
57 // CHECK-LABEL: define {{.*}} @use_address
use_address()58 extern "C" void *use_address() {
59 // CHECK: ret {{.*}} @_ZSt4moveIiEOT_RS0_
60 return (void*)&std::move<int>;
61 }
62
63 // CHECK: define {{.*}} ptr @_ZSt4moveIiEOT_RS0_(ptr
64
65 extern "C" void take_const_int_rref(const int &&);
66 // CHECK-LABEL: define {{.*}} @move_const_int(
move_const_int()67 extern "C" void move_const_int() {
68 // CHECK: store i32 5, ptr %[[N_ADDR:[^,]*]]
69 const int n = 5;
70 // CHECK: call {{.*}} @take_const_int_rref(ptr {{.*}} %[[N_ADDR]])
71 take_const_int_rref(std::move(n));
72 }
73