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AMD retires 3DNow! instruction set



 
 
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  #1  
Old August 23rd 10, 04:35 PM posted to comp.sys.ibm.pc.hardware.chips,comp.arch,comp.sys.intel
Yousuf Khan[_2_]
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Posts: 1,222
Default AMD retires 3DNow! instruction set

I think it's good that somebody isn't afraid to remove support for
certain legacy instruction sets in the x86 world. It's not that software
will fail because of it, since the proper way to implement support for
it was to check its flag with the CPUID instructions.

Yousuf Khan

***

HEXUS.net - News :: AMD retires 3DNow! instruction set : Page - 1/1
"There are two commands that will survive the retirement, though, and
those are PREFETCH and PREFETCHW. AMD is integrating these commands
into a class of their own and will continue to include them in future CPUs."
http://www.hexus.net/content/item.php?item=26063
  #2  
Old August 24th 10, 09:15 AM posted to comp.sys.ibm.pc.hardware.chips,comp.arch,comp.sys.intel
Jim[_28_]
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Posts: 112
Default AMD retires 3DNow! instruction set

"Yousuf Khan" wrote in message
...
I think it's good that somebody isn't afraid to remove support for certain
legacy instruction sets in the x86 world. It's not that software will fail
because of it, since the proper way to implement support for it was to
check its flag with the CPUID instructions.

A few programs did an Intel check for SSE not allowing the AthlonXP to use
them so never under estimate the lazyness of a programmer. But 3DNow was
only useful on the K6-2 (Quake, video drivers, and some encoders are the
only things I know that used it) which could be run on a K6 so
if CPUID==AuthenicAMD (use 3DNow! is unlikely. Running LAME with --noasm
3dnow make no speed difference on my A64.
AMD optimized GCC compiled (-m3dnow/-march=k6-2/athlon) programs might not
run but that shouldn't be a problem.


 




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