mirror of
https://github.com/danbulant/Cosmos
synced 2026-05-27 22:12:25 +00:00
49 lines
2.7 KiB
C#
49 lines
2.7 KiB
C#
using System;
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using CPU = Indy.IL2CPU.Assembler;
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using CPUx86 = Indy.IL2CPU.Assembler.X86;
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namespace Cosmos.IL2CPU.X86.IL
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{
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[Cosmos.IL2CPU.OpCode(ILOpCode.Code.Shr)]
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public class Shr: ILOp
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{
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public Shr(Cosmos.IL2CPU.Assembler aAsmblr):base(aAsmblr)
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{
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}
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public override void Execute(uint aMethodUID, ILOpCode aOpCode) {
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string xLabelName = AssemblerNasm.TmpPosLabel(aMethodUID, aOpCode);
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var xStackItem_ShiftAmount = OldAsmblr.StackContents.Pop();
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var xStackItem_Value = OldAsmblr.StackContents.Pop();
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if (xStackItem_Value.IsFloat) {
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throw new NotImplementedException("Floats not yet supported!");
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}
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if (xStackItem_Value.Size <= 4) {
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new CPUx86.Pop{DestinationReg = CPUx86.Registers.EAX}; // shift amount
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new CPUx86.Pop { DestinationReg = CPUx86.Registers.EBX }; // value
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new CPUx86.Move { DestinationReg = CPUx86.Registers.CL, SourceReg = CPUx86.Registers.AL };
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new CPUx86.ShiftRight { DestinationReg = CPUx86.Registers.EBX, SourceReg=CPUx86.Registers.CL };
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new CPUx86.Push { DestinationReg = CPUx86.Registers.EBX };
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OldAsmblr.StackContents.Push(xStackItem_Value);
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} else if (xStackItem_Value.Size <= 8) {
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new CPUx86.Pop { DestinationReg = CPUx86.Registers.EDX };
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new CPUx86.Move { DestinationReg = CPUx86.Registers.EAX, SourceValue=0 };
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new CPU.Label(xLabelName + "__StartLoop");
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new CPUx86.Compare { DestinationReg = CPUx86.Registers.EDX, SourceReg=CPUx86.Registers.EAX};
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new CPUx86.ConditionalJump { Condition = CPUx86.ConditionalTestEnum.Equal, DestinationLabel = xLabelName + "__EndLoop" };
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new CPUx86.Move { DestinationReg = CPUx86.Registers.EBX, SourceReg = CPUx86.Registers.ESP, SourceIsIndirect=true };
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new CPUx86.Move { DestinationReg = CPUx86.Registers.CL, SourceValue = 1 };
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new CPUx86.ShiftRight { DestinationReg = CPUx86.Registers.EBX, SourceReg = CPUx86.Registers.CL };
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new CPUx86.Move { DestinationReg = CPUx86.Registers.ESP, DestinationIsIndirect=true, SourceReg = CPUx86.Registers.EBX };
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new CPUx86.Move { DestinationReg = CPUx86.Registers.CL, SourceValue = 1 };
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new CPUx86.RotateThroughCarryRight { DestinationReg = CPUx86.Registers.ESP, DestinationIsIndirect = true, DestinationDisplacement = 4, Size = 32, SourceReg=CPUx86.Registers.CL };
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new CPUx86.Add { DestinationReg = CPUx86.Registers.EAX, SourceValue = 1 };
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new CPUx86.Jump { DestinationLabel = xLabelName + "__StartLoop" };
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new CPU.Label(xLabelName + "__EndLoop");
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OldAsmblr.StackContents.Push(xStackItem_Value);
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}
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}
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}
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}
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