private void _FindDivModSolution(RawNum left, RawNum right)
{
if (_IsTrivial(left, right))
{
m_modRaw.CopyFrom(left);
return;
}
m_buffer = OmgPool.GetRawZero();
_CalcDivMod(left, right);
OmgPool.ReleaseNumber(m_buffer);
m_divRaw.Digits.Reverse();
m_modRaw.Digits.Reverse();
}
internal RawNum ExtendedGcd(RawNum left, RawNum right, out OmgNum x, out OmgNum y)
{
if (left.IsZero())
{
x = 0.ToOmgNum();
y = 1.ToOmgNum();
RawNum gcd = OmgPool.GetRawZero();
gcd.CopyFrom(right);
return(gcd);
}
var divModRes = OmgOp.DivMod(right.OmgWrapper(), left.OmgWrapper());
RawNum gcdRes = ExtendedGcd(divModRes.mod.Raw, left, out OmgNum x2, out OmgNum y2);
divModRes.mod.Release();
OmgNum multRes = OmgOp.Multiply(divModRes.div, x2);
divModRes.div.Release();
x = OmgOp.Subtract(y2, multRes);
y2.Release();
multRes.Release();
y = x2;
return(gcdRes);
}
private void _DivModByTwo(OmgNum num)
{
var rawNum = num.Raw;
if (!rawNum.IsZero() && ((rawNum.Digits[0] & 1) == 1))
{
m_modRaw.Digits.Add(1);
}
m_divRaw.CopyFrom(rawNum);
m_divRaw.DivByTwo();
}
internal RawNum FindGcd(RawNum left, RawNum right)
{
if (left.IsZero())
{
RawNum gcd = OmgPool.GetRawZero();
gcd.CopyFrom(right);
return(gcd);
}
var divModRes = OmgOp.DivMod(right.OmgWrapper(), left.OmgWrapper());
divModRes.div.Release();
RawNum gcdRes = FindGcd(divModRes.mod.Raw, left);
divModRes.mod.Release();
return(gcdRes);
}
internal RawNum MultiplyKaratsuba(RawNum left, RawNum right)
{
if (left.IsZero() || right.IsZero())
{
return(OmgPool.GetRawZero());
}
int n = Math.Min(left.Size, right.Size);
(RawNum head, RawNum tail)leftSep = _SeparateHead(left, n);
(RawNum head, RawNum tail)rightSep = _SeparateHead(right, n);
RawNum headsProd = Multiply(leftSep.head, rightSep.head);
RawNum tailsProd = Multiply(leftSep.tail, rightSep.tail);
RawNum headTail = Multiply(leftSep.head, rightSep.tail);
RawNum tailHead = Multiply(leftSep.tail, rightSep.head);
OmgNum midSum = OmgOp.Add(new OmgNum(headTail), new OmgNum(tailHead));
m_multRaw = OmgPool.GetRawZero();
m_multRaw.CopyFrom(tailsProd);
midSum.Raw.Digits.InsertRange(0, Enumerable.Repeat <uint>(0, n));
headsProd.Digits.InsertRange(0, Enumerable.Repeat <uint>(0, 2 * n));
OmgNum res = OmgOp.Add(new OmgNum(tailsProd), midSum);
OmgNum finalRes = OmgOp.Add(new OmgNum(headsProd), res);
midSum.Release();
res.Release();
OmgPool.ReleaseNumber(headTail);
OmgPool.ReleaseNumber(tailHead);
return(finalRes.Raw);
}
