libcxx/test/std/experimental/simd/simd.class/simd_ctor_generator.pass.cpp

   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 // XFAIL: target=powerpc{{.*}}le-unknown-linux-gnu
  11
  12 // <experimental/simd>
  13 //
  14 // [simd.class]
  15 // template<class G> explicit simd(G&& gen) noexcept;
  16
  17 #include "../test_utils.h"
  18 #include <experimental/simd>
  19
  20 namespace ex = std::experimental::parallelism_v2;
  21
  22 template <class T, std::size_t>
  23 struct CheckGenerateSimdCtor {
  24   template <class SimdAbi>
  25   void operator()() {
  26     ex::simd<T, SimdAbi> origin_simd([](T i) { return i; });
  27     constexpr size_t array_size = origin_simd.size();
  28     std::array<T, array_size> expected_value;
  29     for (size_t i = 0; i < array_size; ++i)
  30       expected_value[i] = static_cast<T>(i);
  31     assert_simd_values_equal<array_size>(origin_simd, expected_value);
  32   }
  33 };
  34
  35 template <class U, class T, class SimdAbi = ex::simd_abi::compatible<T>, class = void>
  36 struct has_generate_ctor : std::false_type {};
  37
  38 template <class U, class T, class SimdAbi>
  39 struct has_generate_ctor<U, T, SimdAbi, std::void_t<decltype(ex::simd<T, SimdAbi>(std::declval<U>()))>>
  40     : std::true_type {};
  41
  42 template <class T, std::size_t>
  43 struct CheckGenerateCtorTraits {
  44   template <class SimdAbi>
  45   void operator()() {
  46     static_assert(!has_generate_ctor<SimdAbi, T, SimdAbi>::value);
  47
  48     auto func = [](T i) { return i; };
  49     static_assert(has_generate_ctor<decltype(func), T, SimdAbi>::value);
  50   }
  51 };
  52
  53 int main(int, char**) {
  54   test_all_simd_abi<CheckGenerateSimdCtor>();
  55   test_all_simd_abi<CheckGenerateCtorTraits>();
  56   return 0;
  57 }