1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 // UNSUPPORTED: c++03, c++11, c++14
10
11 // <experimental/simd>
12 //
13 // [simd.traits]
14 // template <class T, class U = typename T::value_type> struct memory_alignment;
15 // template <class T, class U = typename T::value_type>
16 // inline constexpr std::size_t memory_alignment_v = memory_alignment<T, U>::value;
17
18 #include "../test_utils.h"
19
20 namespace ex = std::experimental::parallelism_v2;
21
22 template <class T, std::size_t N>
23 struct CheckMemoryAlignmentMask {
24 template <class SimdAbi>
operator ()CheckMemoryAlignmentMask25 void operator()() {
26 LIBCPP_STATIC_ASSERT(
27 ex::memory_alignment<ex::simd_mask<T, SimdAbi>>::value == bit_ceil(sizeof(bool) * ex::simd_size_v<T, SimdAbi>));
28 LIBCPP_STATIC_ASSERT(
29 ex::memory_alignment_v<ex::simd_mask<T, SimdAbi>> == bit_ceil(sizeof(bool) * ex::simd_size_v<T, SimdAbi>));
30 }
31 };
32
33 template <class T, std::size_t N>
34 struct CheckMemoryAlignmentLongDouble {
35 template <class SimdAbi>
operator ()CheckMemoryAlignmentLongDouble36 void operator()() {
37 if constexpr (std::is_same_v<T, long double>) {
38 // on i686-w64-mingw32-clang++, the size of long double is 12 bytes. Disambiguation is needed.
39 static_assert(
40 ex::memory_alignment<ex::simd<T, SimdAbi>>::value == bit_ceil(sizeof(T) * ex::simd_size_v<T, SimdAbi>));
41 static_assert(ex::memory_alignment_v<ex::simd<T, SimdAbi>> == bit_ceil(sizeof(T) * ex::simd_size_v<T, SimdAbi>));
42 }
43 }
44 };
45
46 struct CheckMemAlignmentFixedDeduce {
47 template <class T, std::size_t N>
checkCheckMemAlignmentFixedDeduce48 void check() {
49 if constexpr (!std::is_same_v<T, long double>) {
50 static_assert(ex::memory_alignment_v<ex::simd<T, ex::simd_abi::fixed_size<N>>> == sizeof(T) * bit_ceil(N),
51 "Memory Alignment mismatch with abi fixed_size");
52 static_assert(ex::memory_alignment<ex::simd<T, ex::simd_abi::fixed_size<N>>>::value == sizeof(T) * bit_ceil(N),
53 "Memory Alignment mismatch with abi fixed_size");
54
55 static_assert(ex::memory_alignment_v<ex::simd<T, ex::simd_abi::deduce_t<T, N>>> == sizeof(T) * bit_ceil(N),
56 "Memory Alignment mismatch with abi deduce");
57 static_assert(ex::memory_alignment<ex::simd<T, ex::simd_abi::deduce_t<T, N>>>::value == sizeof(T) * bit_ceil(N),
58 "Memory Alignment mismatch with abi deduce");
59 }
60 }
61
62 template <class T, std::size_t... N>
performChecksCheckMemAlignmentFixedDeduce63 void performChecks(std::index_sequence<N...>) {
64 (check<T, N + 1>(), ...);
65 }
66
67 template <class T>
operator ()CheckMemAlignmentFixedDeduce68 void operator()() {
69 performChecks<T>(std::make_index_sequence<max_simd_size>{});
70 }
71 };
72
73 struct CheckMemAlignmentScalarNativeCompatible {
74 template <class T>
operator ()CheckMemAlignmentScalarNativeCompatible75 void operator()() {
76 if constexpr (!std::is_same_v<T, long double>) {
77 static_assert(ex::memory_alignment<ex::simd<T, ex::simd_abi::scalar>>::value == sizeof(T));
78 static_assert(ex::memory_alignment_v<ex::simd<T, ex::simd_abi::scalar>> == sizeof(T));
79
80 LIBCPP_STATIC_ASSERT(ex::memory_alignment<ex::simd<T, ex::simd_abi::compatible<T>>>::value == 16);
81 LIBCPP_STATIC_ASSERT(ex::memory_alignment_v<ex::simd<T, ex::simd_abi::compatible<T>>> == 16);
82
83 LIBCPP_STATIC_ASSERT(
84 ex::memory_alignment<ex::simd<T, ex::simd_abi::native<T>>>::value == _LIBCPP_NATIVE_SIMD_WIDTH_IN_BYTES);
85 LIBCPP_STATIC_ASSERT(
86 ex::memory_alignment_v<ex::simd<T, ex::simd_abi::native<T>>> == _LIBCPP_NATIVE_SIMD_WIDTH_IN_BYTES);
87 }
88 }
89 };
90
91 template <class T, class U = typename T::value_type, class = void>
92 struct has_memory_alignment : std::false_type {};
93
94 template <class T, class U>
95 struct has_memory_alignment<T, U, std::void_t<decltype(ex::memory_alignment<T, U>::value)>> : std::true_type {};
96
97 struct CheckMemoryAlignmentTraits {
98 template <class T>
operator ()CheckMemoryAlignmentTraits99 void operator()() {
100 static_assert(has_memory_alignment<ex::native_simd<T>>::value);
101 static_assert(has_memory_alignment<ex::fixed_size_simd_mask<T, 4>>::value);
102 static_assert(has_memory_alignment<ex::native_simd<T>, T>::value);
103 static_assert(has_memory_alignment<ex::fixed_size_simd_mask<T, 4>, bool>::value);
104
105 static_assert(!has_memory_alignment<T, T>::value);
106 static_assert(!has_memory_alignment<T, bool>::value);
107 static_assert(!has_memory_alignment<ex::native_simd<T>, bool>::value);
108 static_assert(!has_memory_alignment<ex::fixed_size_simd_mask<T, 4>, T>::value);
109 }
110 };
111
main(int,char **)112 int main(int, char**) {
113 types::for_each(arithmetic_no_bool_types(), CheckMemAlignmentFixedDeduce());
114 types::for_each(arithmetic_no_bool_types(), CheckMemAlignmentScalarNativeCompatible());
115 test_all_simd_abi<CheckMemoryAlignmentMask>();
116 test_all_simd_abi<CheckMemoryAlignmentLongDouble>();
117 types::for_each(arithmetic_no_bool_types(), CheckMemoryAlignmentTraits());
118 return 0;
119 }
120