public static void Vmad(EmitterContext context)
{
InstVmad op = context.GetOp <InstVmad>();
// TODO: Implement properly.
context.Copy(GetDest(op.Dest), GetSrcReg(context, op.SrcC));
}
public static void Vmad(EmitterContext context)
{
InstVmad op = context.GetOp <InstVmad>();
bool aSigned = (op.ASelect & VectorSelect.S8B0) != 0;
bool bSigned = (op.BSelect & VectorSelect.S8B0) != 0;
Operand srcA = InstEmitAluHelper.Extend(context, GetSrcReg(context, op.SrcA), op.ASelect);
Operand srcC = context.INegate(GetSrcReg(context, op.SrcC), op.AvgMode == AvgMode.NegB);
Operand srcB;
if (op.BVideo)
{
srcB = InstEmitAluHelper.Extend(context, GetSrcReg(context, op.SrcB), op.BSelect);
}
else
{
int imm = op.Imm16;
if (bSigned)
{
imm = (imm << 16) >> 16;
}
srcB = Const(imm);
}
Operand productLow = context.IMultiply(srcA, srcB);
Operand productHigh;
if (aSigned == bSigned)
{
productHigh = aSigned
? context.MultiplyHighS32(srcA, srcB)
: context.MultiplyHighU32(srcA, srcB);
}
else
{
Operand temp = aSigned
? context.IMultiply(srcB, context.ShiftRightS32(srcA, Const(31)))
: context.IMultiply(srcA, context.ShiftRightS32(srcB, Const(31)));
productHigh = context.IAdd(temp, context.MultiplyHighU32(srcA, srcB));
}
if (op.AvgMode == AvgMode.NegA)
{
(productLow, productHigh) = InstEmitAluHelper.NegateLong(context, productLow, productHigh);
}
Operand resLow = InstEmitAluHelper.AddWithCarry(context, productLow, srcC, out Operand sumCarry);
Operand resHigh = context.IAdd(productHigh, sumCarry);
if (op.AvgMode == AvgMode.PlusOne)
{
resLow = InstEmitAluHelper.AddWithCarry(context, resLow, Const(1), out Operand poCarry);
resHigh = context.IAdd(resHigh, poCarry);
}
bool resSigned = op.ASelect == VectorSelect.S32 ||
op.BSelect == VectorSelect.S32 ||
op.AvgMode == AvgMode.NegB ||
op.AvgMode == AvgMode.NegA;
int shift = op.VideoScale switch
{
VideoScale.Shr7 => 7,
VideoScale.Shr15 => 15,
_ => 0
};
if (shift != 0)
{
// Low = (Low >> Shift) | (High << (32 - Shift))
// High >>= Shift
resLow = context.ShiftRightU32(resLow, Const(shift));
resLow = context.BitwiseOr(resLow, context.ShiftLeft(resHigh, Const(32 - shift)));
resHigh = resSigned
? context.ShiftRightS32(resHigh, Const(shift))
: context.ShiftRightU32(resHigh, Const(shift));
}
Operand res = resLow;
if (op.Sat)
{
Operand sign = context.ShiftRightS32(resHigh, Const(31));
if (resSigned)
{
Operand overflow = context.ICompareNotEqual(resHigh, context.ShiftRightS32(resLow, Const(31)));
Operand clampValue = context.ConditionalSelect(sign, Const(int.MinValue), Const(int.MaxValue));
res = context.ConditionalSelect(overflow, clampValue, resLow);
}
else
{
Operand overflow = context.ICompareNotEqual(resHigh, Const(0));
res = context.ConditionalSelect(overflow, context.BitwiseNot(sign), resLow);
}
}
context.Copy(GetDest(op.Dest), res);
// TODO: CC.
}
}
