digit_t is now unsigned, asm division for 1 digit

We now do the "two's complement" in SubBasic by hand. It is maybe even
correct.

diff --git a/src/arbint.cpp b/src/arbint.cpp
index ac39942..696dcd0 100644 (file)
--- a/src/arbint.cpp
+++ b/src/arbint.cpp
@@ -119,6 +119,13 @@ void Arbint::Division(const Arbint & div, Arbint & result, Arbint & remainder) c
                result = *this;
                return;
        }
+       else if (div.m_digits.size() == 1)
+       {
+               result.m_digits.resize(m_digits.size(), 0L);
+               remainder = Arbint(div_digits((digit_t*)&m_digits[0], div.m_digits[0], m_digits.size(), result.m_digits.data()));
+               result.m_sign = !(m_sign == div.m_sign);
+               return;
+       }
        for (int i = 8*sizeof(digit_t)*m_digits.size(); i >= 0; --i)
        {
                remainder <<= 1;
@@ -196,7 +203,7 @@ Arbint & Arbint::SubBasic(const Arbint & sub)
        {
                m_sign = !m_sign;
                for (unsigned i = 0; i < m_digits.size(); ++i)
-                       m_digits[i] = -m_digits[i];
+                       m_digits[i] = (~m_digits[i]) + 1;
        }
        return *this;
 }