FOREX-Dollar slumps vs Swiss franc, yen on GDP, debt woes

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* U.S. 2nd-quarter GDP data paints dismal economic picture

* No breakthrough in U.S. debt talks, vote pushed back

* Worst monthly performance for dollar/yen since Dec. 2008

* Greece uncertainty, Spain downgrade risk weigh on euro
(Adds quote, U.S. data, updates prices)

By Gertrude Chavez-Dreyfuss

NEW YORK, July 29 (Reuters) - The dollar tumbled to
all-time lows against the Swiss franc and four-month troughs
versus the yen on Friday as data showing lackluster U.S. growth
and debt worries on both sides of the Atlantic prompted
investors to seek refuge in traditional safe havens.

The greenback, however, gained against commodity-linked
currencies such as the Australian, Canadian and New Zealand
dollars, which typically struggle when there is heightened risk
aversion.

Gains in the U.S. dollar, Swiss franc and yen accelerated
after data was released showing the U.S. economy grew at a 1.3
percent annual rate in the second quarter, well below the
expected 1.8 percent pace. First-quarter growth was also
revised sharply lower, to 0.3 percent from 1.9 percent.

Read more at the link: http://www.reuters.com/article/2011/07/29/markets-forex-idUSN1E76S0V020110729