more tests passing

Author: tgross35

src/math/log.rs

@@ -402,11 +402,11 @@ impl DInt64 {
         }
 
         let c: u64 = if b < 0 { -b } else { b } as u64;
-        let sign = if b < 0 { !self.sign } else { self.sign };
+        let sign = if b < 0 { (self.sign == 0) as u64 } else { self.sign };
 
         let mut t = self.hi as u128 * c as u128;
 
-        let mut m = if t >> 64 != 0 { (t >> 64).leading_zeros() } else { 64 };
+        let mut m = if t >> 64 != 0 { t.hi().leading_zeros() } else { 64 };
 
         t <<= m;
 
@@ -415,8 +415,9 @@ impl DInt64 {
         let mut l: u128 = self.lo as u128 * c as u128;
         l = (l << (m - 1)) >> 63;
 
-        t = l + t;
-        if t != 0 {
+        let oflow;
+        (t, oflow) = l.overflowing_add(t);
+        if oflow {
             t += t & 0x1;
             t = 1u128 << 127 | t >> 1;
             m -= 1;