Unified ADC accumulator handlers into a single handler

X86Disassembler/X86/Handlers/Bit/BtR32Rm32Handler.cs

@@ -0,0 +1,84 @@
+namespace X86Disassembler.X86.Handlers.Bit;
+
+using Operands;
+
+/// <summary>
+/// Handler for BT r32, r/m32 instruction (0F A3)
+/// </summary>
+public class BtR32Rm32Handler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the BtR32Rm32Handler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public BtR32Rm32Handler(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)
+    {
+        // BT r32, r/m32 is a two-byte opcode: 0F A3
+        if (opcode != 0x0F)
+        {
+            return false;
+        }
+
+        // Check if we have enough bytes to read the second opcode byte
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Check if the second byte is A3
+        var secondByte = Decoder.PeakByte();
+        
+        // Only handle when the operand size prefix is NOT present
+        // This ensures 16-bit handlers get priority when the prefix is present
+        return secondByte == 0xA3 && !Decoder.HasOperandSizePrefix();
+    }
+
+    /// <summary>
+    /// Decodes a BT r32, r/m32 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)
+    {
+        // Set the instruction type
+        instruction.Type = InstructionType.Bt;
+        
+        // Read the second opcode byte (A3)
+        Decoder.ReadByte();
+
+        // Check if we have enough bytes for the ModR/M byte
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Read the ModR/M byte
+        // For BT r/m32, r32 (0F A3):
+        // - The r/m field with mod specifies the destination operand (register or memory)
+        // - The reg field specifies the bit index register
+        var (_, reg, _, destinationOperand) = ModRMDecoder.ReadModRM();
+
+        // Create the register operand for the reg field
+        var bitIndexOperand = OperandFactory.CreateRegisterOperand(reg);
+
+        // Set the structured operands
+        instruction.StructuredOperands = 
+        [
+            destinationOperand,
+            bitIndexOperand
+        ];
+
+        return true;
+    }
+}