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Topic Title: AMD Wide Floating Point Accelerator
Topic Summary: Does "128-bit floating point unit (FPU)" Support ~ 34 decimal digits of precision?
Created On: 01/08/2008 09:10 AM
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 01/08/2008 09:10 AM
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joseph1110
Junior Member

Posts: 1
Joined: 12/17/2007

I quote form the Phenom literature:
"
AMD Wide Floating Point Accelerator

* 128-bit floating point unit (FPU)
* High performance (128bit internal data path) floating point unit per core.
o BENEFIT : Larger data paths for quicker floating point calculations and better performance.
"
.
Does the "128-bit floating point unit (FPU)" support ~ 34 - NOT just ~ 19 - significant decimal digits of floating-point precision from a "long double" C/C++, or FORTRAN REAL*16, declared variable by means of a dedicated single EXTENDED-PRECISION hardware instruction suite, please?
 01/16/2008 11:59 AM
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scareduck
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Joined: 01/16/2008

Dollars to donuts the answer is that this is NOT the IEEE-754r 128-bit float = quad precision = FORTRAN REAL*16. This just describes the internal data path.

The AMD documentation is pitiful.
 01/16/2008 12:09 PM
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MD - Moderator
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Joined: 11/05/2003

You know, you two should take this to the developers forum...

Since this is the enthusiast forum, and a not a lot of developers hang out here...

Although the site is occasionally moderated by AMD employees, it is intended only as a way for visitors to get answers from other visitors, and not to get answers from AMD. Although AMD employees MAY occasionally offer help or suggestions, when you post a problem or a request for help, it will most likely be other AMD customers or users who respond at whatever level they are able, according to their own experience and level of technical expertise.


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The opinions expressed above do not represent those of Advanced Micro Devices or any of their affiliates.

Physics? Ha! This is clearly magic and devilry at work. Prepare firewood! We have witches to burn!


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Edited: 01/16/2008 at 12:09 PM by MD - Moderator
 01/16/2008 12:52 PM
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scareduck
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Where are the developer forums?
 01/17/2008 11:44 PM
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Decembermouse
Mad Scientist

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Joined: 03/31/2004

As long as we're on the topic of developers, I'm curious, are you technically on the clock when you post as a Mod?

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