US stocks finished higher Wednesday, propelled by resurgent optimism about AI, and fading concern about the economic threat posed by US President Donald Trump's tariffs.

The Dow Jones Industrial Average rose 0.7 percent to 44,873.28, while the broad-based S&P 500 climbed 0.4 percent to close at 6,061.48.

The tech-rich Nasdaq Composite Index edged up 0.2 percent to 19,692.33, held down by a 7.3 percent fall in the share price of Google's parent company Alphabet following disappointing quarterly results.

There was some good news for companies linked to the artificial intelligence (AI) revolution, after Alphabet's pledge to invest $75 billion in capital expenditure (CapEx) related to AI.