1 files changed, 14 insertions, 0 deletions
diff --git a/mfbt/FloatingPoint.h b/mfbt/FloatingPoint.h
index 6a0e454ae7..7d73d7e848 100644
--- a/mfbt/FloatingPoint.h
+++ b/mfbt/FloatingPoint.h
@@ -396,6 +396,20 @@ NumbersAreIdentical(T aValue1, T aValue2)
   return BitwiseCast<Bits>(aValue1) == BitwiseCast<Bits>(aValue2);
 }
 
+/**
+ * Return true if |aValue| and |aValue2| are equal (ignoring sign if both are
+ * zero) or both NaN.
+ */
+template <typename T>
+static inline bool
+EqualOrBothNaN(T aValue1, T aValue2)
+{
+  if (IsNaN(aValue1)) {
+    return IsNaN(aValue2);
+  }
+  return aValue1 == aValue2;
+}
+
 namespace detail {
 
 template<typename T>