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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 |
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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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