ircd::simd: Add pointer cast template w/ alignment assertion.

include/ircd/simd/cast.h

@@ -0,0 +1,43 @@
+// The Construct
+//
+// Copyright (C) The Construct Developers, Authors & Contributors
+// Copyright (C) 2016-2020 Jason Volk <jason@zemos.net>
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice is present in all copies. The
+// full license for this software is available in the LICENSE file.
+
+#pragma once
+#define HAVE_IRCD_CAST_H
+
+namespace ircd::simd
+{
+	template<class R,
+	         class T>
+	const R *cast(const T *const &) noexcept;
+
+	template<class R,
+	         class T>
+	R *cast(T *const &) noexcept;
+}
+
+template<class R,
+         class T>
+inline R *
+ircd::simd::cast(T *const &in)
+noexcept
+{
+	assert(uintptr_t(in) % std::alignment_of<R>::value == 0);
+	return reinterpret_cast<R *>(in);
+}
+
+template<class R,
+         class T>
+inline const R *
+ircd::simd::cast(const T *const &in)
+noexcept
+{
+	assert(uintptr_t(in) % std::alignment_of<R>::value == 0);
+	return reinterpret_cast<const R *>(in);
+}

include/ircd/simd/simd.h

@@ -14,6 +14,7 @@
 #include "type.h"
 #include "unaligned.h"
 #include "traits.h"
+#include "cast.h"
 #include "lane_cast.h"
 #include "broad_cast.h"
 #include "split.h"