Skip to content
  • Home Home Home, current page.
  • Moments Moments Moments, current page.

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
comex's profile
comex
comex
comex
@comex

Tweets

comex

@comex

Views expressed here do not necessarily belong to my employer. Or to me.

agoranomic.org
Joined April 2008

Tweets

  • © 2018 Twitter
  • About
  • Help Center
  • Terms
  • Privacy policy
  • 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.

    comex‏ @comex Oct 17

    Wow, this is such a cool idea. Translating regular instructions to SIMD instructions in order to run 16 copies of the same program at once, for fuzzing!https://gamozolabs.github.io/fuzzing/2018/10/14/vectorized_emulation.html …

    1:09 PM - 17 Oct 2018
    • 71 Retweets
    • 189 Likes
    • Markus Wagner L0NGC47 Sami Samhuri The Hash Slinging Cache Thrasher (Miguel Salinas) defunct Peter webmastir mem::forget(cldfire) diadatp
    7 replies 71 retweets 189 likes
      1. comex‏ @comex Oct 17

        (Also, the ‘soft MMU’ thing makes me wonder how expensive it would be for Intel or others to support *optional* byte-wise access permissions in their CPUs. It would allow for so many cool hacks for emulators of all kinds, as well as debuggers…)

        3 replies 1 retweet 3 likes
        Show this thread
        Thanks. Twitter will use this to make your timeline better. Undo
        Undo
      1. New conversation
      2. Patrick Walton‏ @pcwalton Oct 18
        Replying to @comex @RichFelker

        Yeah, AVX-512 is really powerful. I wonder if the endgame of AVX-512 is using it for their GPU ISA, Larrabee-style.

        1 reply 0 retweets 2 likes
      3. andreasgal‏Verified account @andreasgal Oct 18
        Replying to @pcwalton @comex @RichFelker

        Is the x86 pipeline really suitable for GPU workloads?

        1 reply 0 retweets 0 likes
      4. Patrick Walton‏ @pcwalton Oct 18
        Replying to @andreasgal @comex @RichFelker

        I’m not sure that they’ll literally share the same *cores* anytime soon. But sharing the same ISA (at least in part) seems reasonable to me. What I was imagining was CPU-like “big” x86 cores and GPU-like “little” x86 cores on the same die sharing a single SIMD ISA.

        1 reply 0 retweets 3 likes
      5. comex‏ @comex Oct 18
        Replying to @pcwalton @andreasgal @RichFelker

        Isn’t that pretty much exactly Larrabee though? Larrabee was a separate chip rather than on-die, and its 512-bit instructions were slightly different from AVX-512, but other than that it’s the same idea. I guess a new attempt could be less minimalist wrt graphics-specific HW.

        3 replies 0 retweets 2 likes
      6. comex‏ @comex Oct 18
        Replying to @comex @pcwalton and

        …and admittedly, http://tomforsyth1000.github.io/blog.wiki.html#%5B%5BWhy%20didn%27t%20Larrabee%20fail%3F%5D%5D … says Larrabee failed at graphics “mainly for reasons of time and politics”, so perhaps a new attempt could succeed. Oh, and modern GPUs do more compute, so Larrabee’s relative strength at compute would be better suited to today’s games.

        1 reply 0 retweets 0 likes
      7. comex‏ @comex Oct 18
        Replying to @comex @pcwalton and

        Still, I feel like Intel would want to stay far away from anything that looks like just a repeat of Larrabee.

        0 replies 0 retweets 0 likes
      8. End of conversation
      1. New conversation
      2. Brandon Falk‏ @gamozolabs Oct 17
        Replying to @comex

        Thanks for the kind words! Let me know if there is anything you would like to hear more about. I'm getting some great feedback on what people are looking for. The SoftMMU seems to be what people are most interested in. It also applies to QEMU as well which makes it portable

        1 reply 0 retweets 3 likes
      3. Tom Forsyth‏ @tom_forsyth Oct 17
        Replying to @gamozolabs @comex

        This is pretty much what languages like ISPC do with scalar kernels. Unstructured flow control gets pretty hairy, and divergent addresses mean you're going to thrash the caches. But it's certainly interesting to try out.

        0 replies 0 retweets 3 likes
      4. End of conversation
      1. Stephane HLLZI‏ @stephanefr Oct 19
        Replying to @comex @brouhaha

        It reminds me of the great TMC computers.

        0 replies 0 retweets 0 likes
        Thanks. Twitter will use this to make your timeline better. Undo
        Undo
      1. mork  👽‏ @corkmork Oct 17
        Replying to @comex

        Wow. There is EPT sub-pages which supports 64 byte granularity iirc. I have been working on something vaguely similar but not quite as wow: https://rv8.io  (also I am one of the RISC-V port maintainers for QEMU). I’m interested in doing a Hard MMU port of RISC-V on x86.

        0 replies 0 retweets 0 likes
        Thanks. Twitter will use this to make your timeline better. Undo
        Undo
      1. New conversation
      2. Joshua Yanovski‏ @awesomeintheory Oct 17
        Replying to @comex

        Wait, you can still by Xeon Phis? I thought they were (sadly) discontinued.

        1 reply 0 retweets 0 likes
      3. mork  👽‏ @corkmork Oct 17
        Replying to @awesomeintheory @comex

        You can buy a Skylake-X (i9-9980XE) or Cannonlake-U (i3-8121U), both of which have the latest generation of AVX-512. I would like to map the RISC-V vector extension to AVX-512 in binary translation. Variable length Vector on Packed SIMD. An ISA simplification layer essentially.

        0 replies 0 retweets 0 likes
      4. End of conversation
      1. —(••÷[ Đ₳₦₦Ɏ฿Øł ]÷••)—‏ @D4NY44L Oct 17
        Replying to @comex @stroughtonsmith

        Or...u could use a quantum computer to find a load of exploits and bugs by fuzzing in just a few seconds!

        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

      • © 2018 Twitter
      • About
      • Help Center
      • Terms
      • Privacy policy
      • Cookies
      • Ads info