diff --git a/src/simulator/high-precision-double.h b/src/simulator/high-precision-double.h
index d28120da1..091e37e5a 100644
--- a/src/simulator/high-precision-double.h
+++ b/src/simulator/high-precision-double.h
@@ -44,6 +44,8 @@ public:
   inline void Sub (HighPrecision const &o);
   inline void Mul (HighPrecision const &o);
   inline void Div (HighPrecision const &o);
+  inline void MulByInvert (const HighPrecision &o);
+  inline static HighPrecision Invert (uint64_t v);
 
   inline int Compare (HighPrecision const &o) const;
   inline static HighPrecision Zero (void);
@@ -101,6 +103,17 @@ HighPrecision::Div (HighPrecision const &o)
 {
   m_value /= o.m_value;
 }
+void 
+HighPrecision::MulByInvert (const HighPrecision &o)
+{
+  m_value *= o.m_value;
+}
+HighPrecision 
+HighPrecision::Invert (uint64_t v)
+{
+  return HighPrecision (1.0 / v);
+}
+
 int
 HighPrecision::Compare (HighPrecision const &o) const
 {