using System;
using CPUx86 = Cosmos.Compiler.Assembler.X86;

namespace Cosmos.IL2CPU.X86.IL
{
	/// <summary>
	/// Convert top Stack element to Int32.
	/// </summary>
    [Cosmos.IL2CPU.OpCode( ILOpCode.Code.Conv_I4 )]
    public class Conv_I4 : ILOp
    {
        public Conv_I4( 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.SSE.MoveSS { DestinationReg = CPUx86.Registers.XMM0, SourceReg = CPUx86.Registers.ESP, SourceIsIndirect = true };
							new CPUx86.SSE.ConvertSS2SI { DestinationReg = CPUx86.Registers.EAX, SourceReg = CPUx86.Registers.XMM0 };
							new CPUx86.Move { DestinationReg = CPUx86.Registers.ESP, SourceReg = CPUx86.Registers.EAX, DestinationIsIndirect = true };
						}
                        break;
                    }
                case 8:
                    {
						if (xSource.IsFloat)
						{
							new CPUx86.SSE.MoveDoubleAndDupplicate { DestinationReg = CPUx86.Registers.XMM0, SourceReg = CPUx86.Registers.ESP, SourceIsIndirect = true };
							new CPUx86.SSE.ConvertSD2SI { DestinationReg = CPUx86.Registers.EAX, SourceReg = CPUx86.Registers.XMM0 };
							new CPUx86.Move { DestinationReg = CPUx86.Registers.ESP, SourceReg = CPUx86.Registers.EAX, DestinationIsIndirect = true };
						}
						
                        new CPUx86.Pop { DestinationReg = CPUx86.Registers.EAX };
                        new CPUx86.Add { DestinationReg = CPUx86.Registers.ESP, SourceValue = 4 };
                        new CPUx86.Push { DestinationReg = CPUx86.Registers.EAX };
                        break;

                    }
                default:
                    //EmitNotImplementedException( Assembler, GetServiceProvider(), "Conv_I4: SourceSize " + xSource + " not yet supported!", mCurLabel, mMethodInformation, mCurOffset, mNextLabel );
                    throw new NotImplementedException(); 
            }
            Assembler.Stack.Push(4, typeof(Int32));
        }
    }
}