Unified ADC accumulator handlers into a single handler

X86Disassembler/X86/Handlers/Pop/PopRegHandler.cs

@@ -23,7 +23,9 @@ public class PopRegHandler : InstructionHandler
     /// <returns>True if this handler can decode the opcode</returns>
     public override bool CanHandle(byte opcode)
     {
-        return opcode >= 0x58 && opcode <= 0x5F;
+        // Only handle opcodes 0x58-0x5F when the operand size prefix is NOT present
+        // This ensures 16-bit handlers get priority when the prefix is present
+        return opcode >= 0x58 && opcode <= 0x5F && !Decoder.HasOperandSizePrefix();
     }
     
     /// <summary>

X86Disassembler/X86/Handlers/Pop/PopRm32Handler.cs

@@ -0,0 +1,77 @@
+using X86Disassembler.X86.Operands;
+
+namespace X86Disassembler.X86.Handlers.Pop;
+
+/// <summary>
+/// Handler for POP r/m32 instruction (0x8F /0)
+/// </summary>
+public class PopRm32Handler : InstructionHandler
+{
+    /// <summary>
+    /// Initializes a new instance of the PopRm32Handler class
+    /// </summary>
+    /// <param name="decoder">The instruction decoder that owns this handler</param>
+    public PopRm32Handler(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)
+    {
+        // POP r/m32 is encoded as 8F /0
+        if (opcode != 0x8F)
+        {
+            return false;
+        }
+        
+        // Check if we have enough bytes to read the ModR/M byte
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        var reg = ModRMDecoder.PeakModRMReg();
+        
+        // POP r/m32 is encoded as 8F /0 (reg field = 0)
+        // Only handle when the operand size prefix is NOT present
+        // This ensures 16-bit handlers get priority when the prefix is present
+        return reg == 0 && !Decoder.HasOperandSizePrefix();
+    }
+
+    /// <summary>
+    /// Decodes a POP 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.Pop;
+        
+        // Check if we have enough bytes for the ModR/M byte
+        if (!Decoder.CanReadByte())
+        {
+            return false;
+        }
+
+        // Read the ModR/M byte
+        // For POP r/m32 (8F /0):
+        // - The r/m field with mod specifies the operand (register or memory)
+        var (_, _, _, operand) = ModRMDecoder.ReadModRM();
+
+        // Set the structured operands
+        // POP has only one operand
+        instruction.StructuredOperands = 
+        [
+            operand
+        ];
+
+        return true;
+    }
+}