private static void EmitDoublingMultiplyHighHalf(AILEmitterCtx Context, bool Round)
{
AOpCodeSimdReg Op = (AOpCodeSimdReg)Context.CurrOp;
int ESize = 8 << Op.Size;
Context.Emit(OpCodes.Mul);
if (!Round)
{
Context.EmitAsr(ESize - 1);
}
else
{
long RoundConst = 1L << (ESize - 1);
AILLabel LblTrue = new AILLabel();
Context.EmitLsl(1);
Context.EmitLdc_I8(RoundConst);
Context.Emit(OpCodes.Add);
Context.EmitAsr(ESize);
Context.Emit(OpCodes.Dup);
Context.EmitLdc_I8((long)int.MinValue);
Context.Emit(OpCodes.Bne_Un_S, LblTrue);
Context.Emit(OpCodes.Neg);
Context.MarkLabel(LblTrue);
}
}
public static void Sbfm(AILEmitterCtx Context)
{
AOpCodeBfm Op = (AOpCodeBfm)Context.CurrOp;
int BitsCount = Op.GetBitsCount();
if (Op.Pos + 1 == BitsCount)
{
EmitSbfmShift(Context);
}
else if (Op.Pos < Op.Shift)
{
EmitSbfiz(Context);
}
else if (Op.Pos == 7 && Op.Shift == 0)
{
EmitSbfmCast(Context, OpCodes.Conv_I1);
}
else if (Op.Pos == 15 && Op.Shift == 0)
{
EmitSbfmCast(Context, OpCodes.Conv_I2);
}
else if (Op.Pos == 31 && Op.Shift == 0)
{
EmitSbfmCast(Context, OpCodes.Conv_I4);
}
else if (Op.Shift == 0)
{
Context.EmitLdintzr(Op.Rn);
Context.EmitLsl(BitsCount - 1 - Op.Pos);
Context.EmitAsr(BitsCount - 1);
Context.EmitStintzr(Op.Rd);
}
else
{
EmitBfmLoadRn(Context);
Context.EmitLdintzr(Op.Rn);
Context.EmitLsl(BitsCount - 1 - Op.Pos);
Context.EmitAsr(BitsCount - 1);
Context.EmitLdc_I(~Op.TMask);
Context.Emit(OpCodes.And);
Context.Emit(OpCodes.Or);
Context.EmitStintzr(Op.Rd);
}
}
public static void EmitDataLoadOper2(AILEmitterCtx Context)
{
switch (Context.CurrOp)
{
case IAOpCodeAluImm Op:
Context.EmitLdc_I(Op.Imm);
break;
case IAOpCodeAluRs Op:
Context.EmitLdintzr(Op.Rm);
switch (Op.ShiftType)
{
case AShiftType.Lsl: Context.EmitLsl(Op.Shift); break;
case AShiftType.Lsr: Context.EmitLsr(Op.Shift); break;
case AShiftType.Asr: Context.EmitAsr(Op.Shift); break;
case AShiftType.Ror: Context.EmitRor(Op.Shift); break;
}
break;
case IAOpCodeAluRx Op:
Context.EmitLdintzr(Op.Rm);
Context.EmitCast(Op.IntType);
Context.EmitLsl(Op.Shift);
break;
}
}
private static void EmitBfiz(AILEmitterCtx Context, bool Signed)
{
AOpCodeBfm Op = (AOpCodeBfm)Context.CurrOp;
int Width = Op.Pos + 1;
Context.EmitLdintzr(Op.Rn);
Context.EmitLsl(Op.GetBitsCount() - Width);
if (Signed)
{
Context.EmitAsr(Op.Shift - Width);
}
else
{
Context.EmitLsr(Op.Shift - Width);
}
Context.EmitStintzr(Op.Rd);
}