1 files changed, 64 insertions, 0 deletions
diff --git a/contrib/llvm-project/libcxx/include/experimental/__simd/reference.h b/contrib/llvm-project/libcxx/include/experimental/__simd/reference.h
new file mode 100644
index 000000000000..7efbba96ec71
--- /dev/null
+++ b/contrib/llvm-project/libcxx/include/experimental/__simd/reference.h
@@ -0,0 +1,64 @@
+// -*- 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_EXPERIMENTAL___SIMD_REFERENCE_H
+#define _LIBCPP_EXPERIMENTAL___SIMD_REFERENCE_H
+
+#include <__type_traits/is_assignable.h>
+#include <__type_traits/is_same.h>
+#include <__utility/forward.h>
+#include <cstddef>
+#include <experimental/__config>
+#include <experimental/__simd/utility.h>
+
+#if _LIBCPP_STD_VER >= 17 && defined(_LIBCPP_ENABLE_EXPERIMENTAL)
+
+_LIBCPP_BEGIN_NAMESPACE_EXPERIMENTAL
+inline namespace parallelism_v2 {
+template <class _Tp, class _Storage, class _Vp>
+class __simd_reference {
+  template <class, class>
+  friend class simd;
+  template <class, class>
+  friend class simd_mask;
+
+  _Storage& __s_;
+  size_t __idx_;
+
+  _LIBCPP_HIDE_FROM_ABI __simd_reference(_Storage& __s, size_t __idx) : __s_(__s), __idx_(__idx) {}
+
+  _LIBCPP_HIDE_FROM_ABI _Vp __get() const noexcept { return __s_.__get(__idx_); }
+
+  _LIBCPP_HIDE_FROM_ABI void __set(_Vp __v) {
+    if constexpr (is_same_v<_Vp, bool>)
+      __s_.__set(__idx_, experimental::__set_all_bits<_Tp>(__v));
+    else
+      __s_.__set(__idx_, __v);
+  }
+
+public:
+  using value_type = _Vp;
+
+  __simd_reference()                        = delete;
+  __simd_reference(const __simd_reference&) = delete;
+
+  _LIBCPP_HIDE_FROM_ABI operator value_type() const noexcept { return __get(); }
+
+  template <class _Up, enable_if_t<is_assignable_v<value_type&, _Up&&>, int> = 0>
+  _LIBCPP_HIDE_FROM_ABI __simd_reference operator=(_Up&& __v) && noexcept {
+    __set(static_cast<value_type>(std::forward<_Up>(__v)));
+    return {__s_, __idx_};
+  }
+};
+
+} // namespace parallelism_v2
+_LIBCPP_END_NAMESPACE_EXPERIMENTAL
+
+#endif // _LIBCPP_STD_VER >= 17 && defined(_LIBCPP_ENABLE_EXPERIMENTAL)
+#endif // _LIBCPP_EXPERIMENTAL___SIMD_REFERENCE_H