Ryujinx/ChocolArm64/Instruction/AInstEmitCcmp.cs

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2018-02-05 00:08:20 +01:00
using ChocolArm64.Decoder;
using ChocolArm64.State;
using ChocolArm64.Translation;
using System;
using System.Reflection.Emit;
using static ChocolArm64.Instruction.AInstEmitAluHelper;
namespace ChocolArm64.Instruction
{
static partial class AInstEmit
{
private enum CcmpOp
{
Cmp,
Cmn
}
public static void Ccmn(AILEmitterCtx Context) => EmitCcmp(Context, CcmpOp.Cmn);
public static void Ccmp(AILEmitterCtx Context) => EmitCcmp(Context, CcmpOp.Cmp);
private static void EmitCcmp(AILEmitterCtx Context, CcmpOp CmpOp)
{
AOpCodeCcmp Op = (AOpCodeCcmp)Context.CurrOp;
AILLabel LblTrue = new AILLabel();
AILLabel LblEnd = new AILLabel();
Context.EmitCondBranch(LblTrue, Op.Cond);
Context.EmitLdc_I4((Op.NZCV >> 0) & 1);
Context.EmitStflg((int)APState.VBit);
Context.EmitLdc_I4((Op.NZCV >> 1) & 1);
Context.EmitStflg((int)APState.CBit);
Context.EmitLdc_I4((Op.NZCV >> 2) & 1);
Context.EmitStflg((int)APState.ZBit);
Context.EmitLdc_I4((Op.NZCV >> 3) & 1);
Context.EmitStflg((int)APState.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);
}
}
}