subtract_multiple()

void subtract_multiple	(	int &	result,
		int	a,
		int	b )

Definition at line 41 of file godboltTest.cpp.

  {
    // we assume: a, b are NONZERO!!
    // result -= a*b
    int ab = a + b;
    if (ab > p1) ab -= p1;
    int n = exp_table[result] - exp_table[ab];
    if (n < 0) n += p;
    result = log_table[n];
  }

References exp_table, log_table, p, p1, and result().