Added two missing int64 methods (Abs64 and SubAbs64).

ints/math.go

@@ -10,6 +10,14 @@ func Abs(i int) int {
 	return i
 }
 
+// Abs64 returns the absolute value of i.
+func Abs64(i int64) int64 {
+	if 0 > i {
+		return -i
+	}
+	return i
+}
+
 // Min returns the minimum of a and b.
 func Min(a, b int) int {
 	if a < b {
@@ -72,6 +80,14 @@ func SubAbs(a, b int) int {
 	return b - a
 }
 
+// SubAbs64 subtracts a from b and returns the absolute value of the result.
+func SubAbs64(a, b int64) int64 {
+	if a > b {
+		return a - b
+	}
+	return b - a
+}
+
 // Pow returns the power of base b to the exponent e.
 func Pow(b, e int) int {
 	if 0 == e {