Misc. CPU improvements (#519)

* Fix and simplify TranslatorCache

* Fix some assignment alignments, remove some unused usings

* Changes to ILEmitter, separate it from ILEmitterCtx

* Rename ILEmitter to ILMethodBuilder

* Rename LdrLit and *_Fix opcodes

* Revert TranslatorCache impl to the more performant one, fix a few issues with it

* Allow EmitOpCode to be called even after everything has been emitted

* Make Emit and AdvanceOpCode private, simplify it a bit now that it starts emiting from the entry point

* Remove unneeded temp use

* Add missing exit call on TestExclusive

* Use better hash

* Implement the == and != operators

ChocolArm64/Translation/ILMethodBuilder.cs

@@ -0,0 +1,144 @@
+using ChocolArm64.State;
+using System;
+using System.Collections.Generic;
+using System.Reflection.Emit;
+using System.Runtime.Intrinsics;
+
+namespace ChocolArm64.Translation
+{
+    class ILMethodBuilder
+    {
+        public LocalAlloc LocalAlloc { get; private set; }
+
+        public ILGenerator Generator { get; private set; }
+
+        private Dictionary<Register, int> _locals;
+
+        private ILBlock[] _ilBlocks;
+
+        private string _subName;
+
+        private int _localsCount;
+
+        public ILMethodBuilder(ILBlock[] ilBlocks, string subName)
+        {
+            _ilBlocks = ilBlocks;
+            _subName  = subName;
+        }
+
+        public TranslatedSub GetSubroutine()
+        {
+            LocalAlloc = new LocalAlloc(_ilBlocks, _ilBlocks[0]);
+
+            List<Register> subArgs = new List<Register>();
+
+            void SetArgs(long inputs, RegisterType baseType)
+            {
+                for (int bit = 0; bit < 64; bit++)
+                {
+                    long mask = 1L << bit;
+
+                    if ((inputs & mask) != 0)
+                    {
+                        subArgs.Add(GetRegFromBit(bit, baseType));
+                    }
+                }
+            }
+
+            SetArgs(LocalAlloc.GetIntInputs(_ilBlocks[0]), RegisterType.Int);
+            SetArgs(LocalAlloc.GetVecInputs(_ilBlocks[0]), RegisterType.Vector);
+
+            DynamicMethod method = new DynamicMethod(_subName, typeof(long), GetArgumentTypes(subArgs));
+
+            Generator = method.GetILGenerator();
+
+            TranslatedSub subroutine = new TranslatedSub(method, subArgs);
+
+            int argsStart = TranslatedSub.FixedArgTypes.Length;
+
+            _locals = new Dictionary<Register, int>();
+
+            _localsCount = 0;
+
+            for (int index = 0; index < subroutine.SubArgs.Count; index++)
+            {
+                Register reg = subroutine.SubArgs[index];
+
+                Generator.EmitLdarg(index + argsStart);
+                Generator.EmitStloc(GetLocalIndex(reg));
+            }
+
+            foreach (ILBlock ilBlock in _ilBlocks)
+            {
+                ilBlock.Emit(this);
+            }
+
+            return subroutine;
+        }
+
+        private Type[] GetArgumentTypes(IList<Register> Params)
+        {
+            Type[] fixedArgs = TranslatedSub.FixedArgTypes;
+
+            Type[] output = new Type[Params.Count + fixedArgs.Length];
+
+            fixedArgs.CopyTo(output, 0);
+
+            int typeIdx = fixedArgs.Length;
+
+            for (int index = 0; index < Params.Count; index++)
+            {
+                output[typeIdx++] = GetFieldType(Params[index].Type);
+            }
+
+            return output;
+        }
+
+        public int GetLocalIndex(Register reg)
+        {
+            if (!_locals.TryGetValue(reg, out int index))
+            {
+                Generator.DeclareLocal(GetFieldType(reg.Type));
+
+                index = _localsCount++;
+
+                _locals.Add(reg, index);
+            }
+
+            return index;
+        }
+
+        private static Type GetFieldType(RegisterType regType)
+        {
+            switch (regType)
+            {
+                case RegisterType.Flag:   return typeof(bool);
+                case RegisterType.Int:    return typeof(ulong);
+                case RegisterType.Vector: return typeof(Vector128<float>);
+            }
+
+            throw new ArgumentException(nameof(regType));
+        }
+
+        public static Register GetRegFromBit(int bit, RegisterType baseType)
+        {
+            if (bit < 32)
+            {
+                return new Register(bit, baseType);
+            }
+            else if (baseType == RegisterType.Int)
+            {
+                return new Register(bit & 0x1f, RegisterType.Flag);
+            }
+            else
+            {
+                throw new ArgumentOutOfRangeException(nameof(bit));
+            }
+        }
+
+        public static bool IsRegIndex(int index)
+        {
+            return (uint)index < 32;
+        }
+    }
+}