Also I have recently found this paper
http://www.mathematik.uni-dortmund.de/lsiii/static/showpdffile_GoeddekeStrzodkaTurek2006.pdf.

Some citations:
"The double-single emulation on the GPU is not always sufficient, as
the double format has a clearly larger mantissa and exponent range
than the emulated
format: 52/46 = 1.13, 211/28 = 8, and three term emulations become
truly expensive. Therefore, we perform the high precision corrections
on the CPU rather than emulating them on the GPU ...  Instead, the GPU
accelerates the more regular, most demanding parts of the algorithms,
and leaves the subsequent processing of the results to the well
tested, higher abstraction code on the CPU"

Jernej


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