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jinx/ChocolArm64/Instructions/InstEmitAluHelper.cs

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using ChocolArm64.Decoders;
using ChocolArm64.State;
using ChocolArm64.Translation;
using System.Reflection.Emit;
namespace ChocolArm64.Instructions
{
static class InstEmitAluHelper
{
public static void EmitAdcsCCheck(ILEmitterCtx context)
{
//C = (Rd == Rn && CIn) || Rd < Rn
context.EmitSttmp();
context.EmitLdtmp();
context.EmitLdtmp();
EmitDataLoadRn(context);
context.Emit(OpCodes.Ceq);
context.EmitLdflg((int)PState.CBit);
context.Emit(OpCodes.And);
context.EmitLdtmp();
EmitDataLoadRn(context);
context.Emit(OpCodes.Clt_Un);
context.Emit(OpCodes.Or);
context.EmitStflg((int)PState.CBit);
}
public static void EmitAddsCCheck(ILEmitterCtx context)
{
//C = Rd < Rn
context.Emit(OpCodes.Dup);
EmitDataLoadRn(context);
context.Emit(OpCodes.Clt_Un);
context.EmitStflg((int)PState.CBit);
}
public static void EmitAddsVCheck(ILEmitterCtx context)
{
//V = (Rd ^ Rn) & ~(Rn ^ Rm) < 0
context.Emit(OpCodes.Dup);
EmitDataLoadRn(context);
context.Emit(OpCodes.Xor);
EmitDataLoadOpers(context);
context.Emit(OpCodes.Xor);
context.Emit(OpCodes.Not);
context.Emit(OpCodes.And);
context.EmitLdc_I(0);
context.Emit(OpCodes.Clt);
context.EmitStflg((int)PState.VBit);
}
public static void EmitSbcsCCheck(ILEmitterCtx context)
{
//C = (Rn == Rm && CIn) || Rn > Rm
EmitDataLoadOpers(context);
context.Emit(OpCodes.Ceq);
context.EmitLdflg((int)PState.CBit);
context.Emit(OpCodes.And);
EmitDataLoadOpers(context);
context.Emit(OpCodes.Cgt_Un);
context.Emit(OpCodes.Or);
context.EmitStflg((int)PState.CBit);
}
public static void EmitSubsCCheck(ILEmitterCtx context)
{
//C = Rn == Rm || Rn > Rm = !(Rn < Rm)
EmitDataLoadOpers(context);
context.Emit(OpCodes.Clt_Un);
context.EmitLdc_I4(1);
context.Emit(OpCodes.Xor);
context.EmitStflg((int)PState.CBit);
}
public static void EmitSubsVCheck(ILEmitterCtx context)
{
//V = (Rd ^ Rn) & (Rn ^ Rm) < 0
context.Emit(OpCodes.Dup);
EmitDataLoadRn(context);
context.Emit(OpCodes.Xor);
EmitDataLoadOpers(context);
context.Emit(OpCodes.Xor);
context.Emit(OpCodes.And);
context.EmitLdc_I(0);
context.Emit(OpCodes.Clt);
context.EmitStflg((int)PState.VBit);
}
public static void EmitDataLoadRm(ILEmitterCtx context)
{
context.EmitLdintzr(((IOpCodeAluRs64)context.CurrOp).Rm);
}
public static void EmitDataLoadOpers(ILEmitterCtx context)
{
EmitDataLoadRn(context);
EmitDataLoadOper2(context);
}
public static void EmitDataLoadRn(ILEmitterCtx context)
{
IOpCodeAlu64 op = (IOpCodeAlu64)context.CurrOp;
if (op.DataOp == DataOp.Logical || op is IOpCodeAluRs64)
{
context.EmitLdintzr(op.Rn);
}
else
{
context.EmitLdint(op.Rn);
}
}
public static void EmitDataLoadOper2(ILEmitterCtx context)
{
switch (context.CurrOp)
{
case IOpCodeAluImm64 op:
context.EmitLdc_I(op.Imm);
break;
case IOpCodeAluRs64 op:
context.EmitLdintzr(op.Rm);
switch (op.ShiftType)
{
case ShiftType.Lsl: context.EmitLsl(op.Shift); break;
case ShiftType.Lsr: context.EmitLsr(op.Shift); break;
case ShiftType.Asr: context.EmitAsr(op.Shift); break;
case ShiftType.Ror: context.EmitRor(op.Shift); break;
}
break;
case IOpCodeAluRx64 op:
context.EmitLdintzr(op.Rm);
context.EmitCast(op.IntType);
context.EmitLsl(op.Shift);
break;
}
}
public static void EmitDataStore(ILEmitterCtx context) => EmitDataStore(context, false);
public static void EmitDataStoreS(ILEmitterCtx context) => EmitDataStore(context, true);
public static void EmitDataStore(ILEmitterCtx context, bool setFlags)
{
IOpCodeAlu64 op = (IOpCodeAlu64)context.CurrOp;
if (setFlags || op is IOpCodeAluRs64)
{
context.EmitStintzr(op.Rd);
}
else
{
context.EmitStint(op.Rd);
}
}
public static void EmitSetNzcv(ILEmitterCtx context, int nzcv)
{
context.EmitLdc_I4((nzcv >> 0) & 1);
context.EmitStflg((int)PState.VBit);
context.EmitLdc_I4((nzcv >> 1) & 1);
context.EmitStflg((int)PState.CBit);
context.EmitLdc_I4((nzcv >> 2) & 1);
context.EmitStflg((int)PState.ZBit);
context.EmitLdc_I4((nzcv >> 3) & 1);
context.EmitStflg((int)PState.NBit);
}
}
}