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Q: floating-point, losslessness from http://www.wavpack.com/technical.
Porcus
post Feb 17 2012, 17:00
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I quote:
QUOTE
I have decided to not use any floating-point arithmetic in WavPack's data path because I believe that integer operations are less susceptible to subtle chip to chip variations that could corrupt the lossless nature of the compression, the recent Pentium floating point bug being a blatant example of this.


Is this obsoleted, in the sense that Bryant has found that one can now trust floating-point arithmetic, or does it mean that even floating-point .WV files are created using fixed-point arithmetic, without any use of the processor's floating-point internals?


(Edited for clarification.)

This post has been edited by Porcus: Feb 17 2012, 17:37


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saratoga
post Feb 17 2012, 17:06
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QUOTE (Porcus @ Feb 17 2012, 11:00) *
Is this obsoleted, or does it mean that one does not use the processor's floating-point internals?


I don't know about wavpack specifically, but lossless formats tend not to use floating point since addition and multiplication is subject to a somewhat difficult to predict rounding error, which complicates using them for lossless compression.
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