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Re: GPULib on my 64-bit WinXP machine [message #63252 is a reply to message #63155]

Wed, 29 October 2008 15:16

Kenneth P. Bowman
Messages: 585
Registered: May 2000

Senior Member

In article
<ce93a812-3421-47b0-88ad-3772836a72c0@p58g2000hsb.googlegroups.com>,
Vince Hradil <vincehradil@gmail.com> wrote:

>> Do GPUs do IEEE arithmetic (single precision)?
>>
>> Ken Bowman
>
> I believe that is what Peter Messmer said at the user meeting. Of
> course, we're talking specific the CUDA tools on the NVIDIA cards.
>
> More details at: http://en.wikipedia.org/wiki/CUDA
>
> including this "limitation"
> Various deviations from the IEEE 754 standard. Denormals and
> signalling NaNs are not supported; only two IEEE rounding modes are
> supported (chop and round-to-nearest even), and those are specified on
> a per-instruction basis rather than in a control word (whether this is
> a limitation is arguable); and the precision of division/square root
> is slightly lower than single precision.

This is like a flashback to the paleocomputing erra of attached array
processors. (Anyone want to admit that they remember FPS, Inc.?)

Also, Crays had their own floating point units (pre-IEEE) with somewhat
different divide/square root units. Maybe NVIDIA is using the same ideas.

Software has gotten so much more powerful now that this is probably
much more transparent. I'll look at the presentation from the UG meeting
when it's posted.

Ken

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[Message index]

		GPULib on my 64-bit WinXP machine By: Vince Hradil on Thu, 23 October 2008 09:11
		Re: GPULib on my 64-bit WinXP machine By: David Fanning on Mon, 27 October 2008 20:04
		Re: GPULib on my 64-bit WinXP machine By: Kenneth P. Bowman on Tue, 28 October 2008 06:58
		Re: GPULib on my 64-bit WinXP machine By: R.Bauer on Thu, 30 October 2008 03:25
		Re: GPULib on my 64-bit WinXP machine By: Vince Hradil on Tue, 28 October 2008 19:23
		Re: GPULib on my 64-bit WinXP machine By: Kenneth P. Bowman on Wed, 29 October 2008 15:16
		Re: GPULib on my 64-bit WinXP machine By: David Fanning on Wed, 29 October 2008 21:57
		Re: GPULib on my MacBook Pro By: Brian Larsen on Mon, 03 November 2008 15:41
		Re: GPULib on my MacBook Pro By: Marshall Perrin on Sat, 08 November 2008 16:39
		Re: GPULib on my 64-bit WinXP machine By: b_gom on Fri, 07 November 2008 15:30

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