1 // RUN: %clang_cc1 -triple x86_64-linux-pc -fsyntax-only -verify -fexceptions -fcxx-exceptions %s -std=c++17
2 // Note that this test depends on the size of long-long to be different from
3 // int, so it specifies a triple.
4
5 using FourShorts = short __attribute__((__vector_size__(8)));
6 using TwoInts = int __attribute__((__vector_size__(8)));
7 using TwoUInts = unsigned __attribute__((__vector_size__(8)));
8 using FourInts = int __attribute__((__vector_size__(16)));
9 using FourUInts = unsigned __attribute__((__vector_size__(16)));
10 using TwoLongLong = long long __attribute__((__vector_size__(16)));
11 using FourLongLong = long long __attribute__((__vector_size__(32)));
12 using TwoFloats = float __attribute__((__vector_size__(8)));
13 using FourFloats = float __attribute__((__vector_size__(16)));
14 using TwoDoubles = double __attribute__((__vector_size__(16)));
15 using FourDoubles = double __attribute__((__vector_size__(32)));
16
17 FourShorts four_shorts;
18 TwoInts two_ints;
19 TwoUInts two_uints;
20 FourInts four_ints;
21 FourUInts four_uints;
22 TwoLongLong two_ll;
23 FourLongLong four_ll;
24 TwoFloats two_floats;
25 FourFloats four_floats;
26 TwoDoubles two_doubles;
27 FourDoubles four_doubles;
28
29 enum E {};
30 enum class SE {};
31 E e;
32 SE se;
33
34 // Check the rules of the condition of the conditional operator.
Condition()35 void Condition() {
36 // Only int types are allowed here, the rest should fail to convert to bool.
37 (void)(four_floats ? 1 : 1); // expected-error {{is not contextually convertible to 'bool'}}}
38 (void)(two_doubles ? 1 : 1); // expected-error {{is not contextually convertible to 'bool'}}}
39 }
40
41 // Check the rules of the LHS/RHS of the conditional operator.
Operands()42 void Operands() {
43 (void)(four_ints ? four_ints : throw 1); // expected-error {{GNU vector conditional operand cannot be a throw expression}}
44 (void)(four_ints ? throw 1 : four_ints); // expected-error {{GNU vector conditional operand cannot be a throw expression}}
45 (void)(four_ints ?: throw 1); // expected-error {{GNU vector conditional operand cannot be a throw expression}}
46 (void)(four_ints ? (void)1 : four_ints); // expected-error {{GNU vector conditional operand cannot be void}}
47 (void)(four_ints ?: (void)1); // expected-error {{GNU vector conditional operand cannot be void}}
48
49 // Vector types must be the same element size as the condition.
50 (void)(four_ints ? two_ll : two_ll); // expected-error {{vector condition type 'FourInts' (vector of 4 'int' values) and result type 'TwoLongLong' (vector of 2 'long long' values) do not have the same number of elements}}
51 (void)(four_ints ? four_ll : four_ll); // expected-error {{vector condition type 'FourInts' (vector of 4 'int' values) and result type 'FourLongLong' (vector of 4 'long long' values) do not have elements of the same size}}
52 (void)(four_ints ? two_doubles : two_doubles); // expected-error {{vector condition type 'FourInts' (vector of 4 'int' values) and result type 'TwoDoubles' (vector of 2 'double' values) do not have the same number of elements}}
53 (void)(four_ints ? four_doubles : four_doubles); // expected-error {{vector condition type 'FourInts' (vector of 4 'int' values) and result type 'FourDoubles' (vector of 4 'double' values) do not have elements of the same size}}
54 (void)(four_ints ?: two_ints); // expected-error {{vector operands to the vector conditional must be the same type ('FourInts' (vector of 4 'int' values) and 'TwoInts' (vector of 2 'int' values)}}
55 (void)(four_ints ?: four_doubles); // expected-error {{vector operands to the vector conditional must be the same type ('FourInts' (vector of 4 'int' values) and 'FourDoubles' (vector of 4 'double' values)}}
56
57 // Scalars are promoted, but must be the same element size.
58 (void)(four_ints ? 3.0f : 3.0); // expected-error {{vector condition type 'FourInts' (vector of 4 'int' values) and result type '__attribute__((__vector_size__(4 * sizeof(double)))) double' (vector of 4 'double' values) do not have elements of the same size}}
59 (void)(four_ints ? 5ll : 5); // expected-error {{vector condition type 'FourInts' (vector of 4 'int' values) and result type '__attribute__((__vector_size__(4 * sizeof(long long)))) long long' (vector of 4 'long long' values) do not have elements of the same size}}
60 (void)(four_ints ?: 3.0); // expected-error {{cannot convert between scalar type 'double' and vector type 'FourInts' (vector of 4 'int' values) as implicit conversion would cause truncation}}
61 (void)(four_ints ?: 5ll); // We allow this despite GCc not allowing this since we support integral->vector-integral conversions despite integer rank.
62
63 // This one would be allowed in GCC, but we don't allow vectors of enum. Also,
64 // the error message isn't perfect, since it is only going to be a problem
65 // when both sides are an enum, otherwise it'll be promoted to whatever type
66 // the other side causes.
67 (void)(four_ints ? e : e); // expected-error {{enumeration type 'E' is not allowed in a vector conditional}}
68 (void)(four_ints ? se : se); // expected-error {{enumeration type 'SE' is not allowed in a vector conditional}}
69 (void)(four_shorts ? (short)5 : (unsigned short)5); // expected-error {{vector condition type 'FourShorts' (vector of 4 'short' values) and result type '__attribute__((__vector_size__(4 * sizeof(int)))) int' (vector of 4 'int' values) do not have elements of the same size}}
70
71 // They must also be convertible.
72 (void)(four_ints ? 3.0f : 5u);
73 (void)(four_ints ? 3.0f : 5);
74 unsigned us = 5u;
75 int sint = 5;
76 short shrt = 5;
77 unsigned short uss = 5u;
78 // The following 2 error in GCC for truncation errors, but it seems
79 // unimportant and inconsistent to enforce that rule.
80 (void)(four_ints ? 3.0f : us);
81 (void)(four_ints ? 3.0f : sint);
82
83 // Test promotion:
84 (void)(four_shorts ? uss : shrt); // expected-error {{vector condition type 'FourShorts' (vector of 4 'short' values) and result type '__attribute__((__vector_size__(4 * sizeof(int)))) int' (vector of 4 'int' values) do not have elements of the same size}}
85 (void)(four_shorts ? shrt : shrt); // should be fine.
86 (void)(four_ints ? uss : shrt); // should be fine, since they get promoted to int.
87 (void)(four_ints ? shrt : shrt); //expected-error {{vector condition type 'FourInts' (vector of 4 'int' values) and result type '__attribute__((__vector_size__(4 * sizeof(short)))) short' (vector of 4 'short' values) do not have elements of the same size}}
88
89 // Vectors must be the same type as eachother.
90 (void)(four_ints ? four_uints : four_floats); // expected-error {{vector operands to the vector conditional must be the same type ('FourUInts' (vector of 4 'unsigned int' values) and 'FourFloats' (vector of 4 'float' values))}}
91 (void)(four_ints ? four_uints : four_ints); // expected-error {{vector operands to the vector conditional must be the same type ('FourUInts' (vector of 4 'unsigned int' values) and 'FourInts' (vector of 4 'int' values))}}
92 (void)(four_ints ? four_ints : four_uints); // expected-error {{vector operands to the vector conditional must be the same type ('FourInts' (vector of 4 'int' values) and 'FourUInts' (vector of 4 'unsigned int' values))}}
93
94 // GCC rejects these, but our lax vector conversions don't seem to have a problem with them. Allow conversion of the float to an int as an extension.
95 (void)(four_ints ? four_uints : 3.0f);
96 (void)(four_ints ? four_ints : 3.0f);
97
98 // When there is a vector and a scalar, conversions must be legal.
99 (void)(four_ints ? four_floats : 3); // should work, ints can convert to floats.
100 (void)(four_ints ? four_uints : e); // expected-error {{cannot convert between scalar type 'E' and vector type 'FourUInts'}}
101 (void)(four_ints ? four_uints : se); // expected-error {{cannot convert between vector and non-scalar values ('FourUInts' (vector of 4 'unsigned int' values) and 'SE'}}
102 // GCC permits this, but our conversion rules reject this for truncation.
103 (void)(two_ints ? two_ints : us); // expected-error {{cannot convert between scalar type 'unsigned int' and vector type 'TwoInts'}}
104 (void)(four_shorts ? four_shorts : uss); // expected-error {{cannot convert between scalar type 'unsigned short' and vector type 'FourShorts'}}
105 (void)(four_ints ? four_floats : us); // expected-error {{cannot convert between scalar type 'unsigned int' and vector type 'FourFloats'}}
106 (void)(four_ints ? four_floats : sint); // expected-error {{cannot convert between scalar type 'int' and vector type 'FourFloats'}}
107 }
108
109 template <typename T1, typename T2>
110 struct is_same {
111 static constexpr bool value = false;
112 };
113 template <typename T>
114 struct is_same<T, T> {
115 static constexpr bool value = true;
116 };
117 template <typename T1, typename T2>
118 constexpr bool is_same_v = is_same<T1, T2>::value;
119 template <typename T>
120 T &&declval();
121
122 // Check the result types when given two vector types.
ResultTypes()123 void ResultTypes() {
124 // Vectors must be the same, but result is the type of the LHS/RHS.
125 static_assert(is_same_v<TwoInts, decltype(declval<TwoInts>() ? declval<TwoInts>() : declval<TwoInts>())>);
126 static_assert(is_same_v<TwoFloats, decltype(declval<TwoInts>() ? declval<TwoFloats>() : declval<TwoFloats>())>);
127
128 // When both are scalars, converts to vectors of common type.
129 static_assert(is_same_v<TwoUInts, decltype(declval<TwoInts>() ? declval<int>() : declval<unsigned int>())>);
130
131 // Constant is allowed since it doesn't truncate, and should promote to float.
132 static_assert(is_same_v<TwoFloats, decltype(declval<TwoInts>() ? declval<float>() : 5u)>);
133 static_assert(is_same_v<TwoFloats, decltype(declval<TwoInts>() ? 5 : declval<float>())>);
134
135 // when only 1 is a scalar, it should convert to a compatible type.
136 static_assert(is_same_v<TwoFloats, decltype(declval<TwoInts>() ? declval<TwoFloats>() : declval<float>())>);
137 static_assert(is_same_v<TwoInts, decltype(declval<TwoInts>() ? declval<TwoInts>() : declval<int>())>);
138 static_assert(is_same_v<TwoFloats, decltype(declval<TwoInts>() ? declval<TwoFloats>() : 5)>);
139
140 // For the Binary conditional operator, the result type is either the vector on the RHS (that fits the rules on size/count), or the scalar extended to the correct count.
141 static_assert(is_same_v<TwoInts, decltype(declval<TwoInts>() ?: declval<TwoInts>())>);
142 static_assert(is_same_v<TwoInts, decltype(declval<TwoInts>() ?: declval<int>())>);
143 }
144
145 template <typename Cond>
dependent_cond(Cond C)146 void dependent_cond(Cond C) {
147 (void)(C ? 1 : 2);
148 }
149
150 template <typename Operand>
dependent_operand(Operand C)151 void dependent_operand(Operand C) {
152 (void)(two_ints ? 1 : C);
153 (void)(two_ints ? C : 1);
154 (void)(two_ints ? C : C);
155 }
156
157 template <typename Cond, typename LHS, typename RHS>
all_dependent(Cond C,LHS L,RHS R)158 void all_dependent(Cond C, LHS L, RHS R) {
159 (void)(C ? L : R);
160 }
161
162 // Check dependent cases.
Templates()163 void Templates() {
164 dependent_cond(two_ints);
165 dependent_operand(two_floats);
166 // expected-error@159 {{vector operands to the vector conditional must be the same type ('__attribute__((__vector_size__(4 * sizeof(unsigned int)))) unsigned int' (vector of 4 'unsigned int' values) and '__attribute__((__vector_size__(4 * sizeof(double)))) double' (vector of 4 'double' values))}}}
167 all_dependent(four_ints, four_uints, four_doubles); // expected-note {{in instantiation of}}
168
169 // expected-error@159 {{vector operands to the vector conditional must be the same type ('__attribute__((__vector_size__(4 * sizeof(unsigned int)))) unsigned int' (vector of 4 'unsigned int' values) and '__attribute__((__vector_size__(2 * sizeof(unsigned int)))) unsigned int' (vector of 2 'unsigned int' values))}}}
170 all_dependent(four_ints, four_uints, two_uints); // expected-note {{in instantiation of}}
171 all_dependent(four_ints, four_uints, four_uints);
172 }
173