(Reuters) -U.S. stock index futures on Wednesday pointed to an extension in the record-breaking rally on Wall Street after Netflix surged on smashing expectations for subscriber growth, while ASML's strong earnings helped drive gains in chip stocks. Shares of Netflix rose 9.6% in premarket trading after the streaming pioneer's largest-ever fourth-quarter subscriber growth indicated that it had won the streaming wars with its password-sharing crackdown and a strong content slate. "Original content has higher retention rates, making it a serious weapon in the streaming wars," Hargreaves Lansdown's lead equity analyst Sophie Lund-Yates said in a note.