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Subject: is this really faster?

Author: Anthony Cozzie

Date: 14:03:00 04/17/03

Go up one level in this thread

I ask because

1) mmx instructions have a 2-cycle latency on the athlon,
2) getting the data over to the MMX pipe and back takes at *least* 6 cycles
3) this is not really a 64 bit operation
4) I tried AMDs 'optimized' version and it turned out to be much slower than the
simple C hack

I'd be very interested in any performance numbers you have.

anthony

• Re: is this really faster? Gerd Isenberg 00:17:52 04/18/03
  • Re: is this really faster? Dieter Buerssner 12:11:34 04/18/03
    • Re: is this really faster? Gerd Isenberg 02:29:13 04/19/03
      • Re: is this really faster? Dieter Buerssner 09:34:22 04/19/03
        • Re: is this really faster? Filip Tvrzsky 16:31:15 04/21/03
          • Re: is this really faster? Filip Tvrzsky 16:58:42 04/21/03
            • Re: is this really faster? Dieter Buerssner 13:00:05 04/22/03
        • Re: is this really faster? Gerd Isenberg 06:44:30 04/21/03
    • Re: is this really faster? Uri Blass 12:43:02 04/18/03
      • Re: is this really faster? Dieter Buerssner 12:50:26 04/18/03
  • Re: is this really faster? Gerd Isenberg 01:51:06 04/18/03
    • Re: is this really faster? Tim Foden 02:16:04 04/18/03
      • Re: is this really faster? Gerd Isenberg 03:50:53 04/18/03

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