using System;
using CPUx86 = Cosmos.Compiler.Assembler.X86;
using Cosmos.Compiler.Assembler.X86;
namespace Cosmos.IL2CPU.X86.IL
{
	/// <summary>
	/// Convert top Stack element to UInt64 and change its type to Int64.
	/// </summary>
	[Cosmos.IL2CPU.OpCode(ILOpCode.Code.Conv_U8)]
	public class Conv_U8: ILOp
	{
		public Conv_U8(Cosmos.Compiler.Assembler.Assembler aAsmblr):base(aAsmblr)
		{
		}

    public override void Execute(MethodInfo aMethod, ILOpCode aOpCode) {
        var xSource = Assembler.Stack.Pop();
        switch( xSource.Size )
        {
            case 1:
            case 2:
            case 4:
                {
                    if (xSource.IsFloat)
                    {
                        new CPUx86.x87.FloatLoad { DestinationReg = Registers.ESP, Size = 32, DestinationIsIndirect = true };
                        new CPUx86.x87.FloatABS();
                        new CPUx86.x87.FloatRound();
                        new CPUx86.x87.FloatStore { DestinationReg = Registers.ESP, Size = 32, DestinationIsIndirect = true };
                    }
                    else
                    {
                        new CPUx86.Pop { DestinationReg = CPUx86.Registers.EAX };
                        new CPUx86.Push { DestinationValue = 0 };
                        new CPUx86.Push { DestinationReg = CPUx86.Registers.EAX };
                    }
                    break;
                }
            case 8:
                {
                    if (xSource.IsFloat)
                    {
                        new CPUx86.x87.FloatLoad { DestinationReg = Registers.ESP, Size = 64, DestinationIsIndirect = true };
                        new CPUx86.x87.FloatABS();
                        new CPUx86.x87.FloatRound();
                        new CPUx86.x87.FloatStore { DestinationReg = Registers.ESP, Size = 64, DestinationIsIndirect = true };
                    }
                    break;
                }
            default:
                //EmitNotImplementedException( Assembler, GetServiceProvider(), "Conv_U8: SourceSize " + xSource + " not supported!", mCurLabel, mMethodInformation, mCurOffset, mNextLabel );
                throw new NotImplementedException();
			}
			Assembler.Stack.Push(8, typeof(UInt64));
		}
	}
}