AMD Processors Forums - AMD Wide Floating Point Accelerator

AMD Processors

search : help : calendar : home login :

Latest News: ***AMD Processors Forum has been centralized under the AMD Support and Game Forum on October 1st, 2012***

Categories:

latest topics : statistics

AMD Processors » Desktop Products (Phenom™, Athlon 64, Athlon XP & Sempron) » AMD Phenom™ General Info and Specs » AMD Wide Floating Point Accelerator

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
Status: Read Only

Linear : Threading : Single : Branch

Search Topic

Topic Tools

	View similar topics
	Print this topic.

01/08/2008 09:10 AM
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?
Top : Bottom

01/16/2008 11:59 AM
scareduck Junior Member Posts: 2 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.
Top : Bottom

01/16/2008 12:09 PM
MD - Moderator Deployer of Mjölnir - House Keeping Posts: 11102 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. ------------------------- *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!* MODERATOR Edited: 01/16/2008 at 12:09 PM by MD - Moderator
Top : Bottom

01/16/2008 12:52 PM
scareduck Junior Member Posts: 2 Joined: 01/16/2008	Where are the developer forums?
Top : Bottom

01/17/2008 11:44 PM
Decembermouse Mad Scientist Posts: 2149 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? ------------------------- ASRock M3A785GMH/128M Phenom II X4 925c2 @ 2.80GHz (95W) OCZ Platinum PC3-1333 2x2GB 7-7-7-21 WD5000AADS Raidmax RX-500AF Check it out.
Top : Bottom

AMD Processors » Desktop Products (Phenom™, Athlon 64, Athlon XP & Sempron) » AMD Phenom™ General Info and Specs » AMD Wide Floating Point Accelerator

Topic Tools

Statistics

112018 users are registered to the AMD Processors forum.

There are currently 0 users logged in.