Cosmos/source/Compiler/Indy.IL2CPU.X86/IL/x86/Sub.cs

//using System;

//using CPUx86 = Indy.IL2CPU.Assembler.X86;

//namespace Indy.IL2CPU.IL.X86 {
//    [OpCode(OpCodeEnum.Sub)]
//    public class Sub: Op {
//        private string mNextLabel;
//        private string mCurLabel;
//        private uint mCurOffset;
//        private MethodInformation mMethodInformation;
//        public Sub(ILReader aReader, MethodInformation aMethodInfo)
//            : base(aReader, aMethodInfo) {
//             mMethodInformation = aMethodInfo;
//            mCurOffset = aReader.Position;
//            mCurLabel = IL.Op.GetInstructionLabel(aReader);
//            mNextLabel = IL.Op.GetInstructionLabel(aReader.NextPosition);
//        }
//        public override void DoAssemble() {
//            var stackTop = Assembler.StackContents.Pop();

//            if (stackTop.IsFloat)
//            {
//                EmitNotImplementedException(Assembler, GetServiceProvider(), "Sub: Float support not yet implemented!", mCurLabel, mMethodInformation, mCurOffset, mNextLabel);
//                return;
//            }

//            switch (stackTop.Size) {
//                case 1:
//                case 2:
//                case 4:
//                    new CPUx86.Pop { DestinationReg = CPUx86.Registers.ECX }; 
//                    new CPUx86.Pop { DestinationReg = CPUx86.Registers.EAX };
//                    new CPUx86.Sub { DestinationReg = CPUx86.Registers.EAX, SourceReg = CPUx86.Registers.ECX };
//                    new CPUx86.Push { DestinationReg = CPUx86.Registers.EAX };
//                    break;
//                case 8:
//                    new CPUx86.Pop { DestinationReg = CPUx86.Registers.EAX };
//                    new CPUx86.Pop { DestinationReg = CPUx86.Registers.EDX };
//                    new CPUx86.Sub { DestinationReg = CPUx86.Registers.ESP, DestinationIsIndirect = true, SourceReg = CPUx86.Registers.EAX };
//                    new CPUx86.SubWithCarry { DestinationReg = CPUx86.Registers.ESP, DestinationIsIndirect = true, DestinationDisplacement = 4, SourceReg = CPUx86.Registers.EDX };
//                    break;
//                default:
//                    EmitNotImplementedException(Assembler, GetServiceProvider(), "Sub: Size not supported: " + stackTop.Size, mCurLabel, mMethodInformation, mCurOffset, mNextLabel);
//                    return;
//            }
//        }
//    }
//}