Messages in this thread | | | From | Michael Cummins <> | Subject | RE: [patch]K6-2/K-III compile option | Date | Fri, 1 Oct 1999 12:54:02 +1000 |
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> -----Original Message----- > From: Meelis Roos [mailto:mroos@tartu.cyber.ee] > Sent: Friday, 1 October 1999 11:21 > To: mjcumm@isa.mim.com.au > Subject: Re: [patch]K6-2/K-III compile option > > > MC> Maybe I'm mixed up but I thought the K6 didn't have > anything like mmx, > MC> But the 3DNow instructions set in the -2 and -3 version was AMD's > MC> alternative to mmx. > MC> And the Athlon was just adding an extra instruction set > which is similar > MC> to Intel SIMD implementation. > > K6 was essentially like P5-MMX. It had the MMX commands but P5-MMX had > faster MMX and FPU. MMX==additional integer commands. K6 had normal > integer commands quite fast but not the MMX ones. I don't know whether > MMX commands are SIMD. No they aren't pretty sure on this one. MMX-Integer-multiple data single instruction SIMD-Floating Point-multiple data single instruction :-) Michael > > So AMD develoed 3dnow and K6-2 and K6-3 have 3dnow. These are floating > point commands for multimedia operations. SIMD AFAIK. > > Intel saw the benefits and added similar FPU SIMD to PIII. > > Now AMD rebuilt the K* family for better speed and K7 has both integer > and FP operations fast. Even faster than PIII. It's again the fastest > x86 cpu vendor for a short period (like woth K6 when PII was not out > yet). > > -- > Meelis Roos (mroos@tartu.cyber.ee) > ************************************************************** The information contained in this E-Mail is confidential and is intended only for the use of the addressee(s). If you receive this E-Mail in error, any use, distribution or copying of this E-Mail is not permitted. You are requested to forward unwanted E-Mail and address any problems to the MIM Holdings Limited Help Desk. E-Mail: helpdesk@mim.com.au or phone: Australia 07 3833 8042. **************************************************************
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