81 lines
2 KiB
C#
81 lines
2 KiB
C#
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using ChocolArm64.Decoder;
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using ChocolArm64.State;
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using ChocolArm64.Translation;
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using System;
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using System.Reflection.Emit;
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using static ChocolArm64.Instruction.AInstEmitAluHelper;
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namespace ChocolArm64.Instruction
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{
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static partial class AInstEmit
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{
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private enum CcmpOp
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{
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Cmp,
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Cmn
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}
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public static void Ccmn(AILEmitterCtx Context) => EmitCcmp(Context, CcmpOp.Cmn);
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public static void Ccmp(AILEmitterCtx Context) => EmitCcmp(Context, CcmpOp.Cmp);
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private static void EmitCcmp(AILEmitterCtx Context, CcmpOp CmpOp)
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{
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AOpCodeCcmp Op = (AOpCodeCcmp)Context.CurrOp;
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AILLabel LblTrue = new AILLabel();
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AILLabel LblEnd = new AILLabel();
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Context.EmitCondBranch(LblTrue, Op.Cond);
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Context.EmitLdc_I4((Op.NZCV >> 0) & 1);
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Context.EmitStflg((int)APState.VBit);
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Context.EmitLdc_I4((Op.NZCV >> 1) & 1);
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Context.EmitStflg((int)APState.CBit);
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Context.EmitLdc_I4((Op.NZCV >> 2) & 1);
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Context.EmitStflg((int)APState.ZBit);
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Context.EmitLdc_I4((Op.NZCV >> 3) & 1);
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Context.EmitStflg((int)APState.NBit);
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Context.Emit(OpCodes.Br_S, LblEnd);
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Context.MarkLabel(LblTrue);
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EmitDataLoadOpers(Context);
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if (CmpOp == CcmpOp.Cmp)
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{
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Context.Emit(OpCodes.Sub);
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Context.EmitZNFlagCheck();
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EmitSubsCCheck(Context);
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EmitSubsVCheck(Context);
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}
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else if (CmpOp == CcmpOp.Cmn)
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{
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Context.Emit(OpCodes.Add);
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Context.EmitZNFlagCheck();
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EmitAddsCCheck(Context);
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EmitAddsVCheck(Context);
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}
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else
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{
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throw new ArgumentException(nameof(CmpOp));
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}
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Context.Emit(OpCodes.Pop);
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Context.MarkLabel(LblEnd);
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}
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}
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}
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