xref: /llvm-project/libcxx/include/__cxx03/experimental/__simd/scalar.h (revision ce7771902dc50d900de639d499a60486b83f70e0)

// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___CXX03_EXPERIMENTAL___SIMD_SCALAR_H
#define _LIBCPP___CXX03_EXPERIMENTAL___SIMD_SCALAR_H

#include <__cxx03/__assert>
#include <__cxx03/cstddef>
#include <__cxx03/experimental/__config>
#include <__cxx03/experimental/__simd/declaration.h>
#include <__cxx03/experimental/__simd/traits.h>

#if _LIBCPP_STD_VER >= 17 && defined(_LIBCPP_ENABLE_EXPERIMENTAL)

_LIBCPP_BEGIN_NAMESPACE_EXPERIMENTAL
inline namespace parallelism_v2 {
namespace simd_abi {
struct __scalar {
  static constexpr size_t __simd_size = 1;
};
} // namespace simd_abi

template <>
inline constexpr bool is_abi_tag_v<simd_abi::__scalar> = true;

template <class _Tp>
struct __simd_storage<_Tp, simd_abi::__scalar> {
  _Tp __data;

  _LIBCPP_HIDE_FROM_ABI _Tp __get([[maybe_unused]] size_t __idx) const noexcept {
    _LIBCPP_ASSERT_UNCATEGORIZED(__idx == 0, "Index is out of bounds");
    return __data;
  }
  _LIBCPP_HIDE_FROM_ABI void __set([[maybe_unused]] size_t __idx, _Tp __v) noexcept {
    _LIBCPP_ASSERT_UNCATEGORIZED(__idx == 0, "Index is out of bounds");
    __data = __v;
  }
};

template <class _Tp>
struct __mask_storage<_Tp, simd_abi::__scalar> : __simd_storage<bool, simd_abi::__scalar> {};

template <class _Tp>
struct __simd_operations<_Tp, simd_abi::__scalar> {
  using _SimdStorage = __simd_storage<_Tp, simd_abi::__scalar>;
  using _MaskStorage = __mask_storage<_Tp, simd_abi::__scalar>;

  static _LIBCPP_HIDE_FROM_ABI _SimdStorage __broadcast(_Tp __v) noexcept { return {__v}; }

  template <class _Generator>
  static _LIBCPP_HIDE_FROM_ABI _SimdStorage __generate(_Generator&& __g) noexcept {
    return {__g(std::integral_constant<size_t, 0>())};
  }

  template <class _Up>
  static _LIBCPP_HIDE_FROM_ABI void __load(_SimdStorage& __s, const _Up* __mem) noexcept {
    __s.__data = static_cast<_Tp>(__mem[0]);
  }

  template <class _Up>
  static _LIBCPP_HIDE_FROM_ABI void __store(_SimdStorage __s, _Up* __mem) noexcept {
    *__mem = static_cast<_Up>(__s.__data);
  }
};

template <class _Tp>
struct __mask_operations<_Tp, simd_abi::__scalar> {
  using _MaskStorage = __mask_storage<_Tp, simd_abi::__scalar>;

  static _LIBCPP_HIDE_FROM_ABI _MaskStorage __broadcast(bool __v) noexcept { return {__v}; }

  static _LIBCPP_HIDE_FROM_ABI void __load(_MaskStorage& __s, const bool* __mem) noexcept { __s.__data = __mem[0]; }

  static _LIBCPP_HIDE_FROM_ABI void __store(_MaskStorage __s, bool* __mem) noexcept { __mem[0] = __s.__data; }
};

} // namespace parallelism_v2
_LIBCPP_END_NAMESPACE_EXPERIMENTAL

#endif // _LIBCPP_STD_VER >= 17 && defined(_LIBCPP_ENABLE_EXPERIMENTAL)
#endif // _LIBCPP___CXX03_EXPERIMENTAL___SIMD_SCALAR_H