Ryujinx/ChocolArm64/Instructions/InstEmitCcmp.cs

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using ChocolArm64.Decoders;
using ChocolArm64.State;
using ChocolArm64.Translation;
using System;
using System.Reflection.Emit;
using static ChocolArm64.Instructions.InstEmitAluHelper;
namespace ChocolArm64.Instructions
{
static partial class InstEmit
{
private enum CcmpOp
{
Cmp,
Cmn
}
public static void Ccmn(ILEmitterCtx context) => EmitCcmp(context, CcmpOp.Cmn);
public static void Ccmp(ILEmitterCtx context) => EmitCcmp(context, CcmpOp.Cmp);
private static void EmitCcmp(ILEmitterCtx context, CcmpOp cmpOp)
{
OpCodeCcmp64 op = (OpCodeCcmp64)context.CurrOp;
ILLabel lblTrue = new ILLabel();
ILLabel lblEnd = new ILLabel();
context.EmitCondBranch(lblTrue, op.Cond);
context.EmitLdc_I4((op.Nzcv >> 0) & 1);
context.EmitStflg((int)PState.VBit);
context.EmitLdc_I4((op.Nzcv >> 1) & 1);
context.EmitStflg((int)PState.CBit);
context.EmitLdc_I4((op.Nzcv >> 2) & 1);
context.EmitStflg((int)PState.ZBit);
context.EmitLdc_I4((op.Nzcv >> 3) & 1);
context.EmitStflg((int)PState.NBit);
context.Emit(OpCodes.Br_S, lblEnd);
context.MarkLabel(lblTrue);
EmitDataLoadOpers(context);
if (cmpOp == CcmpOp.Cmp)
{
context.Emit(OpCodes.Sub);
context.EmitZnFlagCheck();
EmitSubsCCheck(context);
EmitSubsVCheck(context);
}
else if (cmpOp == CcmpOp.Cmn)
{
context.Emit(OpCodes.Add);
context.EmitZnFlagCheck();
EmitAddsCCheck(context);
EmitAddsVCheck(context);
}
else
{
throw new ArgumentException(nameof(cmpOp));
}
context.Emit(OpCodes.Pop);
context.MarkLabel(lblEnd);
}
}
}