Earnings from semiconductor bellwether Nvidia on Wednesday are set to provide the latest test for a U.S. stock market rally that has taken indexes to record highs this year. A 90% run in Nvidia’s shares this year has made it the third-biggest U.S. company by market value, trailing only Microsoft and Apple. Because Nvidia’s chips are the gold standard in artificial intelligence, its results are widely seen as a barometer for the burgeoning AI industry, whose evolution has stoked investor enthusiasm and helped drive the bull run in U.S. stocks.