NEW YORK — U.S. stocks drifted around their records in a mixed day of trading Wednesday.

The S&P 500 added 0.1 percent and neared its all-time high set a couple weeks ago. The Dow Jones Industrial Average jumped 327 points, or 0.7 percent, to set a record for the second straight day, while the Nasdaq composite slipped 0.3 percent.

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Advanced Micro Devices was at the front of the market. It rallied 9 percent after CEO Lisa Su said the chip company is expecting better than 35 percent of annual compounded revenue growth over the next three to five years. She credited “accelerating AI momentum.”

Stocks benefiting from the artificial-intelligence frenzy have been shaky recently, as investors question whether how much more they can add to already spectacular gains.

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