diff --git a/tmv.h b/tmv.h
index 610e7c6..e6689f0 100644
--- a/tmv.h
+++ b/tmv.h
@@ -51,11 +51,21 @@ static inline tmv_t tmv_div(tmv_t a, int divisor)
 	return a / divisor;
 }
 
+static inline int tmv_is_zero(tmv_t x)
+{
+	return x == ((tmv_t) 0) ? 1 : 0;
+}
+
 static inline tmv_t tmv_sub(tmv_t a, tmv_t b)
 {
 	return a - b;
 }
 
+static inline tmv_t tmv_zero(void)
+{
+	return (tmv_t) 0;
+}
+
 static inline tmv_t correction_to_tmv(Integer64 c)
 {
 	return c >> 16;