common/bit_cast: Add function matching std::bit_cast without constexpr

Add a std::bit_cast-like function archiving the same runtime results as
the standard function, without compile time support.

This allows us to use bit_cast while we wait for compiler support, it
can be trivially replaced in the future.

2 files changed, 23 insertions, 0 deletions

diff --git a/src/common/CMakeLists.txt b/src/common/CMakeLists.txt
index 207c7a0a6..d20e6c3b5 100644
--- a/src/common/CMakeLists.txt
+++ b/src/common/CMakeLists.txt
@@ -102,6 +102,7 @@ add_library(common STATIC
     atomic_ops.h
     detached_tasks.cpp
     detached_tasks.h
+    bit_cast.h
     bit_field.h
     bit_util.h
     cityhash.cpp
diff --git a/src/common/bit_cast.h b/src/common/bit_cast.h
new file mode 100644
index 000000000..a32a063d1
--- /dev/null
+++ b/src/common/bit_cast.h
@@ -0,0 +1,22 @@
+// Copyright 2020 yuzu emulator team
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <cstring>
+#include <type_traits>
+
+namespace Common {
+
+template <typename To, typename From>
+[[nodiscard]] std::enable_if_t<sizeof(To) == sizeof(From) && std::is_trivially_copyable_v<From> &&
+                                   std::is_trivially_copyable_v<To>,
+                               To>
+BitCast(const From& src) noexcept {
+    To dst;
+    std::memcpy(&dst, &src, sizeof(To));
+    return dst;
+}
+
+} // namespace Common