fp: Extract common RoundingMode enum

src/common/fp/rounding_mode.h

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+/* This file is part of the dynarmic project.
+ * Copyright (c) 2018 MerryMage
+ * This software may be used and distributed according to the terms of the GNU
+ * General Public License version 2 or any later version.
+ */
+
+#pragma once
+
+#include "common/common_types.h"
+
+namespace Dynarmic::FP {
+
+/// Ordering of first four values is important as they correspond to bits in FPCR.
+enum class RoundingMode {
+    /// Round to nearest floating point. If there is a tie, round to nearest even digit in required position.
+    ToNearest_TieEven,
+    /// Round up towards positive infinity.
+    TowardsPlusInfinity,
+    /// Round downwards towards negative infinity.
+    TowardsMinusInfinity,
+    /// Truncate towards zero.
+    TowardsZero,
+    /// Round to nearest floating point. If there is a tie, round away from zero.
+    ToNearest_TieAwayFromZero,
+    /// Von Neumann rounding (as modified by Brent). Also known as sticky rounding.
+    /// Set the least significant bit to 1 if the result is not exact.
+    ToOdd,
+};
+
+} // namespace Dynarmic::FP