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. Fiora @ mandatory homestuck!‏ @FioraAeterna 16 Aug 2019
      • Report Tweet
      • Report NetzDG Violation
      Replying to @stephentyrone @johnregehr @moyix

      new optimization levels: -O0 -O1 -Os -O2 -OGentoo

      2 replies 1 retweet 21 likes
    2. Fabian Giesen‏ @rygorous 16 Aug 2019
      • Report Tweet
      • Report NetzDG Violation
      Replying to @FioraAeterna @stephentyrone and

      -Ohno

      2 replies 0 retweets 15 likes
    3. Agent Darkbooty‏ @jeeger 16 Aug 2019
      • Report Tweet
      • Report NetzDG Violation
      Replying to @rygorous @FioraAeterna and

      -Ohgod

      1 reply 0 retweets 6 likes
    4. Steve Canon‏ @stephentyrone 16 Aug 2019
      • Report Tweet
      • Report NetzDG Violation
      Replying to @jeeger @rygorous and

      -Olordhecomin

      1 reply 0 retweets 7 likes
    5. Brendan Dolan-Gavitt‏ @moyix 16 Aug 2019
      • Report Tweet
      • Report NetzDG Violation
      Replying to @stephentyrone @jeeger and

      My original question is really about optimizing for maximum number of opcodes, or -Oops

      2 replies 0 retweets 9 likes
    6. Fiora @ mandatory homestuck!‏ @FioraAeterna 16 Aug 2019
      • Report Tweet
      • Report NetzDG Violation
      Replying to @moyix @stephentyrone and

      brb building a superoptimizer that saves opcodes by doing incredibly slow and horrible things that thrash the pipeline

      2 replies 0 retweets 9 likes
    7. Steve Canon‏ @stephentyrone 16 Aug 2019
      • Report Tweet
      • Report NetzDG Violation
      Replying to @FioraAeterna @moyix and

      LOOP will ride again!

      3 replies 0 retweets 4 likes
    8. Patrick Walton‏ @pcwalton 16 Aug 2019
      • Report Tweet
      • Report NetzDG Violation
      Replying to @stephentyrone @FioraAeterna and

      Has someone filed a bug on getting LLVM to emit XLAT where possible yet

      1 reply 0 retweets 4 likes
    9. iximeow‏ @iximeow 16 Aug 2019
      • Report Tweet
      • Report NetzDG Violation
      Replying to @pcwalton @stephentyrone and

      my favorite x86 instruction, to be quite honest. right up there with xadd

      2 replies 0 retweets 4 likes
    10. Patrick Walton‏ @pcwalton 16 Aug 2019
      • Report Tweet
      • Report NetzDG Violation
      Replying to @iximeow @stephentyrone and

      I wanted to "suggest" using AAD with arbitrary base to save code size but Intel is apparently hell bent on ruining all my funpic.twitter.com/bJfVCLVOiT

      1 reply 0 retweets 5 likes
      Patrick Walton‏ @pcwalton 16 Aug 2019
      • Report Tweet
      • Report NetzDG Violation
      Replying to @pcwalton @iximeow and

      Fun fact: There is a piece of popular software out there that uses DAA. …it’s ZSNES, to implement the SNES CPU’s BCD mode.

      2:56 PM - 16 Aug 2019
      • 6 Likes
      • Jed Davis 🏳️‍🌈 John Regehr Matt Erin ✨💽 iximeow Brendan Dolan-Gavitt
      2 replies 0 retweets 6 likes
        1. New conversation
        2. Tom Seddon‏ @tom_seddon 16 Aug 2019
          • Report Tweet
          • Report NetzDG Violation
          Replying to @pcwalton @iximeow and

          I wonder if this is the right thing? - it looks like DAA might not do exactly the same thing for all inputs as 6502 BCD mode, but I only gave it a quick glance. Might write some test code for this, if this thought is still bothering me tomorrow...

          1 reply 0 retweets 1 like
        3. Patrick Walton‏ @pcwalton 16 Aug 2019
          • Report Tweet
          • Report NetzDG Violation
          Replying to @tom_seddon @iximeow and

          Well, here’s the ZSNES code: https://github.com/ericpearson/zsnes/blob/db4a54f3e1336a9789995eb0c794ecb76a2c7b86/src/cpu/65816d.inc#L236 …

          0 replies 0 retweets 1 like
        4. End of conversation
        1. iximeow‏ @iximeow 16 Aug 2019
          • Report Tweet
          • Report NetzDG Violation
          Replying to @pcwalton @stephentyrone and

          thankfully i can't imagine zsnes ever needing >4gb of memory .. :D

          0 replies 0 retweets 2 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