Berkeley CSUA MOTD:Entry 14073
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2025/07/08 [General] UID:1000 Activity:popular
7/8     

1998/5/8 [Computer/SW/OS/OsX, Computer/HW/CPU] UID:14073 Activity:nil
5/7     Motorola's High-Performance Vector Parallel Processing
        Expansion to the PowerPC Architecture
        http://www.mot.com/SPS/PowerPC/AltiVec/facts.html --jon
        \_ Is this really going to help, if the CPU can't stream data
           in and out fast enough?  I thought existing CPU's all had
           trouble keeping their units fed, let alone a vector unit. --PeterM
           \_ Real vector units (which this is not) are much more efficient
              at keeping functional units fed for a given memory bandwidth,
              as a vector processor can pipeline memory much more efficiently
              than a cache based machine.  Unfortunately, the vector leinght
              on this proposed ISA is WAY WAY WAY too small for this to work.
           \_ I think that's why it only exists on backside-cache CPUs?
           \_ It'll probably help as much as MMX.  -tom
                   \_ And that's the important thing, isn't it?  Because now
                      future Macs and Mac software can have an "Now optimized
                      for AltiVec(tm)!" sticker on the outside of them,
                      thereby assuring sticker and I-dont-know-what-it-means-
                      but-damn-I-the-consumer-sure-need-it parity with Intel.
                      Macintosh forever!
                      \_ and cdaveb can say, "Oh _yeah_?  But yer PC's don't
                         have _AltiVec_!!  Neener-neener!"
           \_ If you want to read more, MacKido has an article:
                http://www.MacKiDo.com/Dojo/AltiVecVsMMX.html
2025/07/08 [General] UID:1000 Activity:popular
7/8     

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