private static void LehmerCore(ref BitsBuffer xBuffer,
ref BitsBuffer yBuffer,
long a, long b,
long c, long d)
{
Debug.Assert(xBuffer.GetLength() >= 1);
Debug.Assert(yBuffer.GetLength() >= 1);
Debug.Assert(xBuffer.GetLength() >= yBuffer.GetLength());
Debug.Assert(a <= 0x7FFFFFFF && b <= 0x7FFFFFFF);
Debug.Assert(c <= 0x7FFFFFFF && d <= 0x7FFFFFFF);
// Executes the combined calculation of Lehmer's step.
uint[] x = xBuffer.GetBits();
uint[] y = yBuffer.GetBits();
int length = yBuffer.GetLength();
long xCarry = 0L, yCarry = 0L;
for (int i = 0; i < length; i++)
{
long xDigit = a * x[i] - b * y[i] + xCarry;
long yDigit = d * y[i] - c * x[i] + yCarry;
xCarry = xDigit >> 32;
yCarry = yDigit >> 32;
x[i] = unchecked ((uint)xDigit);
y[i] = unchecked ((uint)yDigit);
}
xBuffer.Refresh(length);
yBuffer.Refresh(length);
}
private static void LehmerCore(ref BitsBuffer xBuffer,
ref BitsBuffer yBuffer,
long a, long b,
long c, long d)
{
Debug.Assert(xBuffer.GetLength() >= 1);
Debug.Assert(yBuffer.GetLength() >= 1);
Debug.Assert(xBuffer.GetLength() >= yBuffer.GetLength());
Debug.Assert(a <= 0x7FFFFFFF && b <= 0x7FFFFFFF);
Debug.Assert(c <= 0x7FFFFFFF && d <= 0x7FFFFFFF);
// Executes the combined calculation of Lehmer's step.
uint[] x = xBuffer.GetBits();
uint[] y = yBuffer.GetBits();
int length = yBuffer.GetLength();
long xCarry = 0L, yCarry = 0L;
for (int i = 0; i < length; i++)
{
long xDigit = a * x[i] - b * y[i] + xCarry;
long yDigit = d * y[i] - c * x[i] + yCarry;
xCarry = xDigit >> 32;
yCarry = yDigit >> 32;
x[i] = (uint)xDigit;
y[i] = (uint)yDigit;
}
xBuffer.Refresh(length);
yBuffer.Refresh(length);
}