Unified ADC accumulator handlers into a single handler

X86Disassembler/X86/Handlers/Bit/BtsRm32ImmHandler.cs

@@ -0,0 +1,101 @@
+namespace X86Disassembler.X86.Handlers.Bit;
+
+using Operands;
+
+/// <summary>
+/// Handler for BTS r/m32, imm8 instruction (0F BA /5)
+/// </summary>
+public class BtsRm32ImmHandler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the BtsRm32ImmHandler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public BtsRm32ImmHandler(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)
+    {
+        // BTS r/m32, imm8 is encoded as 0F BA /5
+        if (opcode != 0x0F)
+        {
+            return false;
+        }
+
+        // Check if we have enough bytes to read the second opcode byte
+        if (!Decoder.CanRead(2))
+        {
+            return false;
+        }
+
+        var (secondByte, modRm) = Decoder.PeakTwoBytes();
+
+        // Check if the second byte is BA
+        if (secondByte != 0xBA)
+        {
+            return false;
+        }
+
+        // Check if the reg field of the ModR/M byte is 5 (BTS)
+        var reg = ModRMDecoder.GetRegFromModRM(modRm);
+        
+        // Only handle when the operand size prefix is NOT present
+        // This ensures 16-bit handlers get priority when the prefix is present
+        return reg == 5 && !Decoder.HasOperandSizePrefix();
+    }
+
+    /// <summary>
+    /// Decodes a BTS r/m32, imm8 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.Bts;
+        
+        // Read the second opcode byte (BA)
+        Decoder.ReadByte();
+
+        // Check if we have enough bytes for the ModR/M byte
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Read the ModR/M byte
+        // For BTS r/m32, imm8 (0F BA /5):
+        // - The r/m field with mod specifies the destination operand (register or memory)
+        // - The immediate value specifies the bit index
+        var (_, _, _, destinationOperand) = ModRMDecoder.ReadModRM();
+
+        // Check if we have enough bytes for the immediate value
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Read the immediate byte for the bit position
+        byte imm8 = Decoder.ReadByte();
+
+        // Create the immediate operand
+        var bitIndexOperand = OperandFactory.CreateImmediateOperand(imm8, 8);
+
+        // Set the structured operands
+        instruction.StructuredOperands = 
+        [
+            destinationOperand,
+            bitIndexOperand
+        ];
+
+        return true;
+    }
+}