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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    1. Patrick Walton‏ @pcwalton 7 Mar 2019
      • Report Tweet
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      x86 is space efficient, you say? AArch64: sub x9,x10,x11: 4 bytes. x86-64: mov r9,r10; sub r9,r11: 6 bytes. (Can’t use LEA here.) AArch64: sub x9,x10,#1234: 4 bytes. x86-64: lea r9,[r10-1234]: 7 bytes.

      5 replies 2 retweets 25 likes
    2. Joe Groff‏ @jckarter 7 Mar 2019
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      Replying to @pcwalton

      Well arm64 is pretty good as far as load/store isas go too

      1 reply 0 retweets 0 likes
    3. Slava Pestov‏ @slava_pestov 7 Mar 2019
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      Replying to @jckarter @pcwalton

      And while x86 may have been space optimized once, decades of extensions and prefixes completely ruined it

      2 replies 0 retweets 11 likes
    4. Patrick Walton‏ @pcwalton 7 Mar 2019
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      Replying to @slava_pestov @jckarter

      Yep. I keep saying this, but it feels like nobody believes me :)

      3 replies 0 retweets 2 likes
    5. Joe Groff‏ @jckarter 7 Mar 2019
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      Replying to @pcwalton @slava_pestov

      Probably a legacy of the i386 vs PowerPC days. There are better RISC ISAs, and x86 has gotten heftier, since then

      2 replies 0 retweets 0 likes
    6. Patrick Walton‏ @pcwalton 7 Mar 2019
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      Replying to @jckarter @slava_pestov

      I think it’s because Linus had a rant back in the Pentium 4 days about how awesome and space efficient x86 was and people still have that impression

      2 replies 0 retweets 10 likes
    7. Graydon Hoare‏ @graydon_pub 7 Mar 2019
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      Replying to @pcwalton @jckarter @slava_pestov

      Yep. Context was actually bashing ia64: https://yarchive.net/comp/linux/x86.html … Which, I mean, in fairness:pic.twitter.com/WFog1zNTja

      3 replies 0 retweets 4 likes
    8. Patrick Walton‏ @pcwalton 7 Mar 2019
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      Replying to @graydon_pub @jckarter @slava_pestov

      “And last I heard, by the time Itanium 2 is up at 2GHz, the P4 is apparently going to be at 5GHz” 🤪

      1 reply 0 retweets 2 likes
      Patrick Walton‏ @pcwalton 7 Mar 2019
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      Replying to @pcwalton @graydon_pub and

      The 31-stage pipelining in NetBurst is a sight to behold…Intel sure loves design heroics :)

      9:17 PM - 7 Mar 2019
      • 5 Likes
      • Marcus Akhil Indurti Joe Groff iximeow eddyb, thriving in isolation,
      2 replies 0 retweets 5 likes
        1. New conversation
        2. eddyb, thriving in isolation,‏ @eddyb_r 7 Mar 2019
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          Replying to @pcwalton @graydon_pub and

          did they call it that because the netlist was bursting at the seams?

          1 reply 0 retweets 1 like
        3. Patrick Walton‏ @pcwalton 7 Mar 2019
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          Replying to @eddyb_r @graydon_pub and

          It’s because if it mispredicts a branch your CPU explodes

          0 replies 1 retweet 7 likes
        4. End of conversation
        1. New conversation
        2. Graydon Hoare‏ @graydon_pub 7 Mar 2019
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          Replying to @pcwalton @jckarter @slava_pestov

          Haha I remember well! Bought one for the oprofile work and heated my apartment through a couple winters with it.

          1 reply 0 retweets 3 likes
        3. Bruce Mitchener‏ @ArmyOfBruce 7 Mar 2019
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          Replying to @graydon_pub @pcwalton and

          Wearing shorts in winter because you had one under your desk.

          0 replies 0 retweets 0 likes
        4. End of conversation

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