feature: .NET 10 (ryubing/ryujinx!214)

See merge request ryubing/ryujinx!214

src/ARMeilleure/Instructions/SoftFloat/SoftFloat.cs

@@ -0,0 +1,111 @@
+using ARMeilleure.State;
+using System;
+using System.Diagnostics;
+
+namespace ARMeilleure.Instructions
+{
+    static class SoftFloat
+    {
+        static SoftFloat()
+        {
+            RecipEstimateTable = BuildRecipEstimateTable();
+            RecipSqrtEstimateTable = BuildRecipSqrtEstimateTable();
+        }
+
+        public static readonly byte[] RecipEstimateTable;
+        public static readonly byte[] RecipSqrtEstimateTable;
+
+        private static byte[] BuildRecipEstimateTable()
+        {
+            byte[] tbl = new byte[256];
+
+            for (int idx = 0; idx < 256; idx++)
+            {
+                uint src = (uint)idx + 256u;
+
+                Debug.Assert(src is >= 256u and < 512u);
+
+                src = (src << 1) + 1u;
+
+                uint aux = (1u << 19) / src;
+
+                uint dst = (aux + 1u) >> 1;
+
+                Debug.Assert(dst is >= 256u and < 512u);
+
+                tbl[idx] = (byte)(dst - 256u);
+            }
+
+            return tbl;
+        }
+
+        private static byte[] BuildRecipSqrtEstimateTable()
+        {
+            byte[] tbl = new byte[384];
+
+            for (int idx = 0; idx < 384; idx++)
+            {
+                uint src = (uint)idx + 128u;
+
+                Debug.Assert(src is >= 128u and < 512u);
+
+                if (src < 256u)
+                {
+                    src = (src << 1) + 1u;
+                }
+                else
+                {
+                    src = (src >> 1) << 1;
+                    src = (src + 1u) << 1;
+                }
+
+                uint aux = 512u;
+
+                while (src * (aux + 1u) * (aux + 1u) < (1u << 28))
+                {
+                    aux++;
+                }
+
+                uint dst = (aux + 1u) >> 1;
+
+                Debug.Assert(dst is >= 256u and < 512u);
+
+                tbl[idx] = (byte)(dst - 256u);
+            }
+
+            return tbl;
+        }
+
+        public static void FPProcessException(FPException exc, ExecutionContext context)
+        {
+            FPProcessException(exc, context, context.Fpcr);
+        }
+
+        public static void FPProcessException(FPException exc, ExecutionContext context, FPCR fpcr)
+        {
+            int enable = (int)exc + 8;
+
+            if ((fpcr & (FPCR)(1 << enable)) != 0)
+            {
+                throw new NotImplementedException("Floating-point trap handling.");
+            }
+            else
+            {
+                context.Fpsr |= (FPSR)(1 << (int)exc);
+            }
+        }
+
+        extension(FPCR fpcr)
+        {
+            public FPRoundingMode RoundingMode 
+            {
+                get 
+                {
+                    const int RModeShift = 22;
+                    
+                    return (FPRoundingMode)(((uint)fpcr >> RModeShift) & 3u);
+                }
+            }
+        }
+    }
+}