Ref implementation of FP8

src/api/include/migraphx/migraphx.h

@@ -44,7 +44,8 @@
     m(int32_type, int32_t) \
     m(int64_type, int64_t) \
     m(uint32_type, uint32_t) \
-    m(uint64_type, uint64_t)
+    m(uint64_type, uint64_t) \
+    m(fp8e4m3fnuz_type, migraphx::fp8::fp8e4m3fnuz)
 // clang-format on
 
 #ifdef __cplusplus

src/include/migraphx/bit_cast.hpp

@@ -0,0 +1,50 @@
+/* ************************************************************************
+ * Copyright (C) 2016-2023 Advanced Micro Devices, Inc. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell cop-
+ * ies of the Software, and to permit persons to whom the Software is furnished
+ * to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IM-
+ * PLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNE-
+ * CTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * ************************************************************************ */
+#ifndef MIGRAPHX_GUARD_RTGLIB_BITCAST_HPP
+#define MIGRAPHX_GUARD_RTGLIB_BITCAST_HPP
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wstrict-aliasing"
+#endif
+#include <migraphx/config.hpp>
+
+// NOLINTNEXTLINE(cppcoreguidelines-macro-usage)
+#define MIGRAPHX_CONST_FOLD(x) (__builtin_constant_p(x) ? (x) : (x))
+
+namespace migraphx {
+inline namespace MIGRAPHX_INLINE_NS {
+template <typename To, typename From>
+inline constexpr To bit_cast(From fr) noexcept
+{
+    static_assert(sizeof(To) == sizeof(From));
+#if defined(__GNUC__) and !defined(__clang__)
+    return MIGRAPHX_CONST_FOLD(*reinterpret_cast<To*>(&fr));
+#else
+    return __builtin_bit_cast(To, fr);
+#endif
+}
+} // namespace MIGRAPHX_INLINE_NS
+} // namespace migraphx
+#if defined(__GNUC__) && !defined(__clang__)
+#pragma GCC diagnostic pop
+#endif
+#endif // MIGRAPHX_GUARD_RTGLIB_BITCAST_HPP