Added hack with null-check for escaping extra boxing for non-nullable keys in HashMap (#4174)

2020-05-15 17:45:33 +03:00
parent 6d5edf01bf
commit c485511f1b
1 changed files with 2 additions and 1 deletions
@@ -190,7 +190,8 @@ actual class HashMap<K, V> private constructor(
        return newValuesArray
    }

-    private fun hash(key: K) = (key.hashCode() * MAGIC) ushr hashShift
+    // Null-check for escaping extra boxing for non-nullable keys.
+    private fun hash(key: K) = if (key == null) 0 else (key.hashCode() * MAGIC) ushr hashShift

    private fun compact() {
        var i = 0