TOKYO (Reuters) - Asian stocks edged up on Wednesday after data showing the U.S. economy growing at a relatively solid pace calmed investor anxiety over slowing global growth, while the Australian dollar languished near four-year lows against the US dollar.

Oil prices were also under pressure as major oil producing nations failed to agree on curbs to output ahead of an OPEC meeting on Thursday.

The U.S. government upgraded its reading on third quarter gross domestic product to 3.9 per cent on Tuesday from 3.5 per cent reported last month. Economists polled by Reuters had expected growth would be cut to 3.3 per cent.

"The gap between actual and estimated third quarter GDP was a big one, but what is of increasing import is the gap between the economy of the U.S. and the rest of the world especially Europe and Japan," Jasper Lawler, analyst at CMC Markets, said in a note.

MSCI's broadest index of Asia-Pacific shares outside Japan gained 0.3 per cent. South Korea's Kospi tacked on 0.1 per cent and Australian shares rose 0.9 per cent.

Tokyo's Nikkei retreated 0.3 per cent, weighed by the yen's bounce.

The dollar remained on the defensive against the yen as the encouraging GDP news was partially offset by an unexpected drop in U.S. consumer confidence, which also pushed U.S. Treasury yields lower.

The greenback was down 0.1 per cent at 117.82 yen, pulling further away from a seven-year high of 118.98 reached the previous week.

The euro was little changed at $1.2477.

In contrast, the Australian dollar hovered near a four-year low of US$0.8514. The Aussie has been under pressure amid the recent tumble in the price of iron ore, Australia's key export commodity.

Crude oil extended losses after a meeting of Saudi Arabia and three other nations ahead of Thursday's closely-watched OPEC summit ended with no deal to curb crude output.

U.S. crude was down 32 cents at US$73.77 a barrel, near a four-year low of US$73.25 hit a little more than a week ago.