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cmuratori's profile
Casey Muratori
Casey Muratori
Casey Muratori
@cmuratori

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Casey Muratori

@cmuratori

I'm worried that the baby thinks people can't change.

Seattle
caseymuratori.com
Joined March 2009

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    Casey Muratori‏ @cmuratori 18 Apr 2019

    Casey Muratori Retweeted Green Lightning

    This paper is a must-read for C/C++ programmers.https://twitter.com/MGreenLightning/status/1118823644627709953 …

    Casey Muratori added,

    Green Lightning @MGreenLightning
    Great paper: „Optimization“ based on undefined behavior hurts performance: http://www.complang.tuwien.ac.at/kps2015/proceedings/KPS_2015_submission_29.pdf … (cc @Jonathan_Blow @cmuratori @AbnerCoimbre @handmade_net)
    10:34 PM - 18 Apr 2019
    • 46 Retweets
    • 210 Likes
    • math destroy (quasi monte carlo simulated) VonnegutVhan суфьян сименс V Omid Ghavami Zeitooni Mehmet Cemil Özkaya Jace Cear lostplesed SulfurDookie
    5 replies 46 retweets 210 likes
      1. New conversation
      2. Marcos‏ @marcos_don 18 Apr 2019
        Replying to @cmuratori

        Even if it did not hurt performance, it hurts the very idea of programming: express our ideas and algorithms, not those of the compiler authors or random emergent behaviours.

        1 reply 0 retweets 6 likes
      3. Jeroen Baert‏Verified account @jbaert 19 Apr 2019
        Replying to @marcos_don @cmuratori

        It's also a very shaky foundation to base your optimization on. Someone recompiling x years from now could shoot themselves in the foot.

        0 replies 0 retweets 1 like
      4. End of conversation
      1. Nick Marinelli‏ @NickTheNewbie 19 Apr 2019
        Replying to @cmuratori @Jonathan_Blow

        BUT I DON'T WANNAAAAAAAAAAAA

        0 replies 0 retweets 0 likes
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      1. if you love video games so much why dont you mario‏ @zakedodead 19 Apr 2019
        Replying to @cmuratori

        Even if it DID produce better optimizations, I really don't want to be treated like a child because someone over at clang HQ noticed a slight opening that they could attack my code with.

        0 replies 0 retweets 1 like
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      1. New conversation
      2. if you love video games so much why dont you mario‏ @zakedodead 19 Apr 2019
        Replying to @cmuratori

        Is there a known-good compiler (tinycc?) for using what this paper calls C* ? Or are there real security implications when you go too far back? @nothings uses VS 6 right, are these concerns part of his reasoning or is he worried more about the IDE?

        1 reply 0 retweets 0 likes
      3. (BLM) Sean Barrett‏ @nothings 19 Apr 2019
        Replying to @zakedodead @cmuratori

        It's just the IDE for me. In general VS hasn't gone down the "C" path so much. Yet.

        0 replies 0 retweets 0 likes
      4. End of conversation
      1. Andrew J. Bromage‏ @deguerre 20 Apr 2019
        Replying to @cmuratori

        With my former compiler writer hat on, I have to agree. Compiler writers should spend less time on getting another 0.05% on SPEC* benchmarks and start providing some optimisation GUARANTEES. Where's the C++ compiler that promises that copy elision always happens when it applies?

        0 replies 0 retweets 0 likes
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