Hello, please review this small change . On s390x we have an unused function pd_zero_to_words_large in the code that can be removed, this is done here . Bug/webrev : https://bugs.openjdk.java.net/browse/JDK-8237819 http://cr.openjdk.java.net/~mbaesken/webrevs/8237819.0/ Thanks, Matthias