Investors see Nvidia’s quarterly report, coming after the bell, as a barometer for the strength of the boom in artificial intelligence because the company makes most of the chips that power the technology. Its heavy weighting also gives Nvidia outsized influence as a bellwether for the broader market. Its shares were flat.

Investors will be looking out for how much Nvidia expects its China business to play into its revenue for the October quarter. But one analyst isn’t expecting the chip maker to share much about the uncertain situation.

The main U.S. stock indexes were mixed on Wednesday as investors took a breather ahead of Nvidia's earnings, which are expected to test the momentum of Wall Street's AI-driven rally.