cuda::std::simd load and store functionalities

libcudacxx/include/cuda/std/__simd/abi.h

@@ -0,0 +1,51 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of libcu++ in the CUDA C++ Core Libraries,
+// 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
+// SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _CUDA_STD___SIMD_ABI_H
+#define _CUDA_STD___SIMD_ABI_H
+
+#include <cuda/std/detail/__config>
+
+#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
+#  pragma GCC system_header
+#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
+#  pragma clang system_header
+#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
+#  pragma system_header
+#endif // no system header
+
+#include <cuda/std/__cstddef/types.h>
+
+#include <cuda/std/__cccl/prologue.h>
+
+namespace cuda::std::simd
+{
+using __simd_size_type = ::cuda::std::ptrdiff_t;
+
+// [simd.expos.abi], simd ABI tags
+namespace simd_abi
+{
+template <__simd_size_type _Np>
+struct __fixed_size_simple; // internal ABI tag
+
+template <__simd_size_type _Np>
+using fixed_size_simple = __fixed_size_simple<_Np>; // implementation-defined ABI
+
+template <typename>
+using native = fixed_size_simple<1>; // implementation-defined ABI
+
+template <typename, __simd_size_type _Np>
+using __deduce_abi_t = fixed_size_simple<_Np>; // exposition-only
+} // namespace simd_abi
+} // namespace cuda::std::simd
+
+#include <cuda/std/__cccl/epilogue.h>
+
+#endif // _CUDA_STD___SIMD_ABI_H