Reorganize floating point handlers into logical subfolders

X86Disassembler/X86/Handlers/FloatingPoint/Control/FnstswHandler.cs

@@ -0,0 +1,76 @@
+using X86Disassembler.X86.Operands;
+
+namespace X86Disassembler.X86.Handlers.FloatingPoint.Control;
+
+/// <summary>
+/// Handler for FNSTSW AX instruction (0xDF 0xE0)
+/// </summary>
+public class FnstswHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the FnstswHandler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public FnstswHandler(InstructionDecoder decoder)
+        : base(decoder)
+    {
+    }
+
+    /// <summary>
+    /// Checks if this handler can decode the given opcode
+    /// </summary>
+    /// <param name="opcode">The opcode to check</param>
+    /// <returns>True if this handler can decode the opcode</returns>
+    public override bool CanHandle(byte opcode)
+    {
+        // FNSTSW is a two-byte opcode (0xDF 0xE0)
+        if (opcode != 0xDF) return false;
+
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        if (Decoder.PeakByte() != 0xE0) 
+            return false;
+        
+        return true;
+
+    }
+    
+    /// <summary>
+    /// Decodes an FNSTSW instruction
+    /// </summary>
+    /// <param name="opcode">The opcode of the instruction</param>
+    /// <param name="instruction">The instruction object to populate</param>
+    /// <returns>True if the instruction was successfully decoded</returns>
+    public override bool Decode(byte opcode, Instruction instruction)
+    {
+        // Check if we can read the second byte of the opcode
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+        
+        // Verify the second byte is 0xE0
+        byte secondByte = Decoder.ReadByte();
+        if (secondByte != 0xE0)
+        {
+            return false;
+        }
+        
+        // Set the instruction type
+        instruction.Type = InstructionType.Fnstsw;
+        
+        // Create the AX register operand
+        var axOperand = OperandFactory.CreateRegisterOperand(RegisterIndex.A, 16);
+        
+        // Set the structured operands
+        instruction.StructuredOperands = 
+        [
+            axOperand
+        ];
+        
+        return true;
+    }
+}