TOP2 probably illegal smart moves

By: Richard Cownie (tich.delete@this.pobox.com), September 29, 2009 10:31 am
Room: Moderated Discussions
David Kanter (dkanter@realworldtech.com) on 9/29/09 wrote:
---------------------------

>I don't think that P6 really stole much from Alpha. The really tricky part for
>P6 was figuring out how you might get x86-->uops efficiently with sufficient ILP for OOOE.

Yes. My impression was that it was Pentium (not PentiumPro)
that involved more, to put it politely, disputed technology.
The relative timing of the first Alpha AXP and the first
Pentium would suggest that was plausible. And since Intel
ended up paying about $700M to DEC (admittedly in a complex
deal which bought Intel a fab and various other stuff), I
tend to think there was some substance to DEC's claims.

Pentium was the first time Intel went superscalar; and it
was the first time they got in the same ballpark as RISC
(at least the weaker RISCs - Pentium overtook SPARCstation,
and stayed ahead as it ramped up clockspeed while
SuperSPARC flopped). If you see a mediocre hitter who
suddenly starts hitting 40+ home runs, you reckon he's
probably cheating. And Intel's cpu designs made that kind
of leap between 486 and Pentium.

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                (12nJ/cycle)*3GHz = 36W (NT)Michael S2009/09/29 08:31 AM
                  That's what I get for posting so early. (NT)slacker2009/09/29 06:17 PM
          TOP3 blunderskoby m.2009/09/29 07:26 AM
            TOP3 blundersJouni Osmala2009/09/29 11:05 PM
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    ISA extensions - tensilica?David Kanter2009/09/26 10:17 AM
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  TOP3 blundersanonymous2009/09/26 06:23 AM
  TOP3 smart movesanonib2009/09/26 07:11 PM
    TOP3 smart movesDavid W. Hess2009/09/26 07:55 PM
      TOP3 smart movesRichard Cownie2009/09/27 01:57 PM
        TOP3 smart movesRagingDragon2009/09/28 03:46 PM
    TOP3 smart movesa reader2009/09/27 08:44 AM
    TOP3 smart movesRichard Cownie2009/09/27 12:12 PM
      TOP2 probably illegal smart movesRichard Cownie2009/09/27 01:43 PM
        TOP2 probably illegal smart movesnn2009/09/27 07:27 PM
        TOP2 probably illegal smart movesDavid Kanter2009/09/29 01:48 AM
          TOP2 probably illegal smart movesRichard Cownie2009/09/29 10:31 AM
            TOP2 probably illegal smart movesMichael S2009/09/29 11:04 AM
              TOP2 probably illegal smart movesDavid Kanter2009/09/29 01:35 PM
              TOP2 probably illegal smart movesRichard Cownie2009/09/29 04:28 PM
              TOP2 probably illegal smart movesJouni Osmala2009/09/29 11:08 PM
              Link to good analysis on the matter.Jouni Osmala2009/09/29 11:22 PM
                Link to good analysis on the matter.Richard Cownie2009/09/30 09:59 AM
  TOP3 blunder of todayMichael S2009/09/29 04:31 AM
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