Skip to content
By using Twitter’s services you agree to our Cookies Use. We and our partners operate globally and use cookies, including for analytics, personalisation, and ads.

This is the legacy version of twitter.com. We will be shutting it down on June 1, 2020. Please switch to a supported browser, or disable the extension which masks your browser. You can see a list of supported browsers in our Help Center.

  • Home Home Home, current page.
  • About

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @
  • Language: English
    • Bahasa Indonesia
    • Bahasa Melayu
    • Català
    • Čeština
    • Dansk
    • Deutsch
    • English UK
    • Español
    • Filipino
    • Français
    • Hrvatski
    • Italiano
    • Magyar
    • Nederlands
    • Norsk
    • Polski
    • Português
    • Română
    • Slovenčina
    • Suomi
    • Svenska
    • Tiếng Việt
    • Türkçe
    • Ελληνικά
    • Български език
    • Русский
    • Српски
    • Українська мова
    • עִבְרִית
    • العربية
    • فارسی
    • मराठी
    • हिन्दी
    • বাংলা
    • ગુજરાતી
    • தமிழ்
    • ಕನ್ನಡ
    • ภาษาไทย
    • 한국어
    • 日本語
    • 简体中文
    • 繁體中文
  • Have an account? Log in
    Have an account?
    · Forgot password?

    New to Twitter?
    Sign up
pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

Tweets

Patrick Walton

@pcwalton

Research engineer at Mozilla

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

Tweets

  • © 2020 Twitter
  • About
  • Help Center
  • Terms
  • Privacy policy
  • Imprint
  • Cookies
  • Ads info
Dismiss
Previous
Next

Go to a person's profile

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @

Promote this Tweet

Block

  • Tweet with a location

    You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more

    Your lists

    Create a new list


    Under 100 characters, optional

    Privacy

    Copy link to Tweet

    Embed this Tweet

    Embed this Video

    Add this Tweet to your website by copying the code below. Learn more

    Add this video to your website by copying the code below. Learn more

    Hmm, there was a problem reaching the server.

    By embedding Twitter content in your website or app, you are agreeing to the Twitter Developer Agreement and Developer Policy.

    Preview

    Why you're seeing this ad

    Log in to Twitter

    · Forgot password?
    Don't have an account? Sign up »

    Sign up for Twitter

    Not on Twitter? Sign up, tune into the things you care about, and get updates as they happen.

    Sign up
    Have an account? Log in »

    Two-way (sending and receiving) short codes:

    Country Code For customers of
    United States 40404 (any)
    Canada 21212 (any)
    United Kingdom 86444 Vodafone, Orange, 3, O2
    Brazil 40404 Nextel, TIM
    Haiti 40404 Digicel, Voila
    Ireland 51210 Vodafone, O2
    India 53000 Bharti Airtel, Videocon, Reliance
    Indonesia 89887 AXIS, 3, Telkomsel, Indosat, XL Axiata
    Italy 4880804 Wind
    3424486444 Vodafone
    » See SMS short codes for other countries

    Confirmation

     

    Welcome home!

    This timeline is where you’ll spend most of your time, getting instant updates about what matters to you.

    Tweets not working for you?

    Hover over the profile pic and click the Following button to unfollow any account.

    Say a lot with a little

    When you see a Tweet you love, tap the heart — it lets the person who wrote it know you shared the love.

    Spread the word

    The fastest way to share someone else’s Tweet with your followers is with a Retweet. Tap the icon to send it instantly.

    Join the conversation

    Add your thoughts about any Tweet with a Reply. Find a topic you’re passionate about, and jump right in.

    Learn the latest

    Get instant insight into what people are talking about now.

    Get more of what you love

    Follow more accounts to get instant updates about topics you care about.

    Find what's happening

    See the latest conversations about any topic instantly.

    Never miss a Moment

    Catch up instantly on the best stories happening as they unfold.

    1. Claire Xen  🏳️‍🌈 🏳️‍⚧️ 🧙🏻‍♀️‏ @oe1cxw 11 Oct 2019
      • Report Tweet
      • Report NetzDG Violation

      What I find most funny about ARM moving to allow custom ISA extensions is that in last year's "risc-v basics" smear campaign one of their main arguments against RISC-V was that it'd be unfathomably bad that RISC-V allows custom ISA extensions bc that would lead to fragmentation.

      5 replies 18 retweets 95 likes
    2. Rich Felker‏ @RichFelker 11 Oct 2019
      • Report Tweet
      • Report NetzDG Violation
      Replying to @oe1cxw

      FWIW, I think the argument was correct. I wish RISC-V and others would explore ways to do custom extensions that don't clash with ISA encoding space.

      3 replies 0 retweets 4 likes
    3. Patrick Walton‏ @pcwalton 11 Oct 2019
      • Report Tweet
      • Report NetzDG Violation
      Replying to @RichFelker @oe1cxw

      It would be nice if we could have a RISC-V do-over that’s just an average, boring ISA, nothing weird or experimental.

      1 reply 0 retweets 3 likes
    4. Rich Felker‏ @RichFelker 11 Oct 2019
      • Report Tweet
      • Report NetzDG Violation
      Replying to @pcwalton @oe1cxw

      I don't see much of it as weird or experimental, just reasonable risc without all the mips badness copied like everyone else did.

      3 replies 0 retweets 3 likes
      Patrick Walton‏ @pcwalton 11 Oct 2019
      • Report Tweet
      • Report NetzDG Violation
      Replying to @RichFelker @oe1cxw

      What are your thoughts on https://gist.github.com/erincandescent/8a10eeeea1918ee4f9d9982f7618ef68 … ?

      4:10 PM - 11 Oct 2019
      • 5 Likes
      • Thomas Kindler John Regehr whitequark Dougall Rich Felker
      3 replies 0 retweets 5 likes
        1. New conversation
        2. Rich Felker‏ @RichFelker 11 Oct 2019
          • Report Tweet
          • Report NetzDG Violation
          Replying to @pcwalton @oe1cxw

          Roughly half is moderately serious, half is pointless pedantry about things that don't matter or complaints about good choices.

          1 reply 0 retweets 2 likes
        3. Rich Felker‏ @RichFelker 11 Oct 2019
          • Report Tweet
          • Report NetzDG Violation
          Replying to @RichFelker @pcwalton @oe1cxw

          Atomics being optional is absolutely wrong. Non-SMP core can implement lr/sc trivially and should be required to. Likewise for mul but not quite as serious since it *can* be emulated in sw.

          3 replies 0 retweets 1 like
        4. 12 more replies
        1. New conversation
        2. Tony “Abolish ICE” Arcieri  🦀‏ @bascule 11 Oct 2019
          • Report Tweet
          • Report NetzDG Violation
          Replying to @pcwalton @RichFelker @oe1cxw

          As a general statement, the common theme of most of these complaints is the minimalist core they standardized and froze for all time does not contain many desirable instructions. But many of these complaints have been resolved by instructions added in draft versions of the ISA

          1 reply 0 retweets 1 like
        3. Tony “Abolish ICE” Arcieri  🦀‏ @bascule 11 Oct 2019
          • Report Tweet
          • Report NetzDG Violation
          Replying to @bascule @pcwalton and

          In that regard, I'd say it can be likened to the "batteries included std" debate. To get to the point of a permanently frozen core ISA, they pursued a minimum viable product, perhaps to a fault, but that isn't intended to be the steady state.

          1 reply 0 retweets 2 likes
        4. 1 more reply
        1. Brendan G Bohannon‏ @cr88192 11 Oct 2019
          • Report Tweet
          • Report NetzDG Violation
          Replying to @pcwalton @RichFelker @oe1cxw

          A lot of this matches my own thoughts as well (wrt DIV, lack of Reg+Reg*Sc, ...). In an ISA: I have found I prefer a True/False status flag (like in SuperH), which also allows predicated ops to be encoded cheaper (2b vs 4b). Also nifty: sticking the FPU in GPR space; ...

          0 replies 0 retweets 0 likes
          Thanks. Twitter will use this to make your timeline better. Undo
          Undo

      Loading seems to be taking a while.

      Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.

        Promoted Tweet

        false

        • © 2020 Twitter
        • About
        • Help Center
        • Terms
        • Privacy policy
        • Imprint
        • Cookies
        • Ads info