fp: Extract common RoundingMode enum

src/CMakeLists.txt

@@ -17,6 +17,7 @@ add_library(dynarmic
     common/crc32.cpp
     common/crc32.h
     common/fp_util.h
+    common/fp/rounding_mode.h
     common/intrusive_list.h
     common/iterator_util.h
     common/llvm_disassemble.cpp

src/backend_x64/a32_emit_x64.cpp

@@ -59,7 +59,7 @@ A32::LocationDescriptor A32EmitContext::Location() const {
 }
 
 bool A32EmitContext::FPSCR_RoundTowardsZero() const {
-    return Location().FPSCR().RMode() != A32::FPSCR::RoundingMode::TowardsZero;
+    return Location().FPSCR().RMode() != FP::RoundingMode::TowardsZero;
 }
 
 bool A32EmitContext::FPSCR_FTZ() const {

src/backend_x64/a64_emit_x64.cpp

@@ -41,7 +41,7 @@ A64::LocationDescriptor A64EmitContext::Location() const {
 }
 
 bool A64EmitContext::FPSCR_RoundTowardsZero() const {
-    return Location().FPCR().RMode() != A64::FPCR::RoundingMode::TowardsZero;
+    return Location().FPCR().RMode() != FP::RoundingMode::TowardsZero;
 }
 
 bool A64EmitContext::FPSCR_FTZ() const {

src/common/fp/rounding_mode.h

@@ -0,0 +1,30 @@
+/* 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

src/frontend/A32/FPSCR.h

@@ -10,6 +10,7 @@
 
 #include "common/bit_util.h"
 #include "common/common_types.h"
+#include "common/fp/rounding_mode.h"
 
 namespace Dynarmic::A32 {
 
@@ -19,13 +20,6 @@ namespace Dynarmic::A32 {
 class FPSCR final
 {
 public:
-    enum class RoundingMode {
-        ToNearest,
-        TowardsPlusInfinity,
-        TowardsMinusInfinity,
-        TowardsZero
-    };
-
     FPSCR() = default;
     FPSCR(const FPSCR&) = default;
     FPSCR(FPSCR&&) = default;
@@ -79,8 +73,8 @@ public:
     }
 
     /// Rounding mode control field.
-    RoundingMode RMode() const {
+    FP::RoundingMode RMode() const {
-        return static_cast<RoundingMode>(Common::Bits<22, 23>(value));
+        return static_cast<FP::RoundingMode>(Common::Bits<22, 23>(value));
     }
 
     /// Indicates the stride of a vector.

src/frontend/A64/FPCR.h

@@ -10,6 +10,7 @@
 
 #include "common/bit_util.h"
 #include "common/common_types.h"
+#include "common/fp/rounding_mode.h"
 
 namespace Dynarmic::A64 {
 
@@ -19,13 +20,6 @@ namespace Dynarmic::A64 {
 class FPCR final
 {
 public:
-    enum class RoundingMode {
-        ToNearest,
-        TowardsPlusInfinity,
-        TowardsMinusInfinity,
-        TowardsZero
-    };
-
     FPCR() = default;
     FPCR(const FPCR&) = default;
     FPCR(FPCR&&) = default;
@@ -54,8 +48,8 @@ public:
     }
 
     /// Rounding mode control field.
-    RoundingMode RMode() const {
+    FP::RoundingMode RMode() const {
-        return static_cast<RoundingMode>(Common::Bits<22, 23>(value));
+        return static_cast<FP::RoundingMode>(Common::Bits<22, 23>(value));
     }
 
     /// Input denormal exception trap enable flag.