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 using EightBools = bool __attribute__((ext_vector_type(8)));
17
18 FourShorts four_shorts;
19 TwoInts two_ints;
20 TwoUInts two_uints;
21 FourInts four_ints;
22 FourUInts four_uints;
23 TwoLongLong two_ll;
24 FourLongLong four_ll;
25 TwoFloats two_floats;
26 FourFloats four_floats;
27 TwoDoubles two_doubles;
28 FourDoubles four_doubles;
29 EightBools eight_bools;
30 EightBools other_eight_bools;
31
32 enum E {};
33 enum class SE {};
34 E e;
35 SE se;
36
37 // Check the rules of the condition of the conditional operator.
Condition()38 void Condition() {
39 // Only int types are allowed here, the rest should fail to convert to bool.
40 (void)(four_floats ? 1 : 1); // expected-error {{is not contextually convertible to 'bool'}}}
41 (void)(two_doubles ? 1 : 1); // expected-error {{is not contextually convertible to 'bool'}}}
42 }
43
44 // Check the rules of the LHS/RHS of the conditional operator.
Operands()45 void Operands() {
46 (void)(four_ints ? four_ints : throw 1); // expected-error {{GNU vector conditional operand cannot be a throw expression}}
47 (void)(four_ints ? throw 1 : four_ints); // expected-error {{GNU vector conditional operand cannot be a throw expression}}
48 (void)(four_ints ?: throw 1); // expected-error {{GNU vector conditional operand cannot be a throw expression}}
49 (void)(four_ints ? (void)1 : four_ints); // expected-error {{GNU vector conditional operand cannot be void}}
50 (void)(four_ints ?: (void)1); // expected-error {{GNU vector conditional operand cannot be void}}
51
52 // Vector types must be the same element size as the condition.
53 (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}}
54 (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}}
55 (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}}
56 (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}}
57 (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)}}
58 (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)}}
59
60 // Scalars are promoted, but must be the same element size.
61 (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}}
62 (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}}
63 (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}}
64 (void)(four_ints ?: 5ll); // We allow this despite GCc not allowing this since we support integral->vector-integral conversions despite integer rank.
65
66 // This one would be allowed in GCC, but we don't allow vectors of enum. Also,
67 // the error message isn't perfect, since it is only going to be a problem
68 // when both sides are an enum, otherwise it'll be promoted to whatever type
69 // the other side causes.
70 (void)(four_ints ? e : e); // expected-error {{enumeration type 'E' is not allowed in a vector conditional}}
71 (void)(four_ints ? se : se); // expected-error {{enumeration type 'SE' is not allowed in a vector conditional}}
72 (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}}
73
74 // They must also be convertible.
75 (void)(four_ints ? 3.0f : 5u);
76 (void)(four_ints ? 3.0f : 5);
77 unsigned us = 5u;
78 int sint = 5;
79 short shrt = 5;
80 unsigned short uss = 5u;
81 // The following 2 error in GCC for truncation errors, but it seems
82 // unimportant and inconsistent to enforce that rule.
83 (void)(four_ints ? 3.0f : us);
84 (void)(four_ints ? 3.0f : sint);
85
86 // Test promotion:
87 (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}}
88 (void)(four_shorts ? shrt : shrt); // should be fine.
89 (void)(four_ints ? uss : shrt); // should be fine, since they get promoted to int.
90 (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}}
91
92 // Vectors must be the same type as eachother.
93 (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))}}
94 (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))}}
95 (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))}}
96
97 // 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.
98 (void)(four_ints ? four_uints : 3.0f);
99 (void)(four_ints ? four_ints : 3.0f);
100
101 // Allow conditional select on bool vectors.
102 (void)(eight_bools ? eight_bools : other_eight_bools);
103
104 // When there is a vector and a scalar, conversions must be legal.
105 (void)(four_ints ? four_floats : 3); // should work, ints can convert to floats.
106 (void)(four_ints ? four_uints : e); // expected-error {{cannot convert between scalar type 'E' and vector type 'FourUInts'}}
107 (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'}}
108 // GCC permits this, but our conversion rules reject this for truncation.
109 (void)(two_ints ? two_ints : us); // expected-error {{cannot convert between scalar type 'unsigned int' and vector type 'TwoInts'}}
110 (void)(four_shorts ? four_shorts : uss); // expected-error {{cannot convert between scalar type 'unsigned short' and vector type 'FourShorts'}}
111 (void)(four_ints ? four_floats : us); // expected-error {{cannot convert between scalar type 'unsigned int' and vector type 'FourFloats'}}
112 (void)(four_ints ? four_floats : sint); // expected-error {{cannot convert between scalar type 'int' and vector type 'FourFloats'}}
113 }
114
115 template <typename T1, typename T2>
116 struct is_same {
117 static constexpr bool value = false;
118 };
119 template <typename T>
120 struct is_same<T, T> {
121 static constexpr bool value = true;
122 };
123 template <typename T1, typename T2>
124 constexpr bool is_same_v = is_same<T1, T2>::value;
125 template <typename T>
126 T &&declval();
127
128 // Check the result types when given two vector types.
ResultTypes()129 void ResultTypes() {
130 // Vectors must be the same, but result is the type of the LHS/RHS.
131 static_assert(is_same_v<TwoInts, decltype(declval<TwoInts>() ? declval<TwoInts>() : declval<TwoInts>())>);
132 static_assert(is_same_v<TwoFloats, decltype(declval<TwoInts>() ? declval<TwoFloats>() : declval<TwoFloats>())>);
133
134 // When both are scalars, converts to vectors of common type.
135 static_assert(is_same_v<TwoUInts, decltype(declval<TwoInts>() ? declval<int>() : declval<unsigned int>())>);
136
137 // Constant is allowed since it doesn't truncate, and should promote to float.
138 static_assert(is_same_v<TwoFloats, decltype(declval<TwoInts>() ? declval<float>() : 5u)>);
139 static_assert(is_same_v<TwoFloats, decltype(declval<TwoInts>() ? 5 : declval<float>())>);
140
141 // when only 1 is a scalar, it should convert to a compatible type.
142 static_assert(is_same_v<TwoFloats, decltype(declval<TwoInts>() ? declval<TwoFloats>() : declval<float>())>);
143 static_assert(is_same_v<TwoInts, decltype(declval<TwoInts>() ? declval<TwoInts>() : declval<int>())>);
144 static_assert(is_same_v<TwoFloats, decltype(declval<TwoInts>() ? declval<TwoFloats>() : 5)>);
145
146 // 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.
147 static_assert(is_same_v<TwoInts, decltype(declval<TwoInts>() ?: declval<TwoInts>())>);
148 static_assert(is_same_v<TwoInts, decltype(declval<TwoInts>() ?: declval<int>())>);
149 }
150
151 template <typename Cond>
dependent_cond(Cond C)152 void dependent_cond(Cond C) {
153 (void)(C ? 1 : 2);
154 }
155
156 template <typename Operand>
dependent_operand(Operand C)157 void dependent_operand(Operand C) {
158 (void)(two_ints ? 1 : C);
159 (void)(two_ints ? C : 1);
160 (void)(two_ints ? C : C);
161 }
162
163 template <typename Cond, typename LHS, typename RHS>
all_dependent(Cond C,LHS L,RHS R)164 void all_dependent(Cond C, LHS L, RHS R) {
165 (void)(C ? L : R);
166 }
167
168 // Check dependent cases.
Templates()169 void Templates() {
170 dependent_cond(two_ints);
171 dependent_operand(two_floats);
172 // expected-error@165 {{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))}}}
173 all_dependent(four_ints, four_uints, four_doubles); // expected-note {{in instantiation of}}
174
175 // expected-error@165 {{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))}}}
176 all_dependent(four_ints, four_uints, two_uints); // expected-note {{in instantiation of}}
177 all_dependent(four_ints, four_uints, four_uints);
178 }
179