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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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    Patrick Walton‏ @pcwalton 8 Mar 2016
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    I'm still confused by the way it's become fashionable lately to bash optimizing compilers, of all things. They're important!

    1:57 PM - 8 Mar 2016
    • 13 Retweets
    • 20 Likes
    • Rich Felker Raymond Hammarling Sunil Pai Sander 🕵️‍♂️🕵️‍♂️🕵️‍♂️ Donald Pipowitch Manish Steve McGuire mr. waddlesplash Alexander Cherepanov
    7 replies 13 retweets 20 likes
      1. New conversation
      2. Scott Michaud‏ @scottmichaud 8 Mar 2016
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        Replying to @pcwalton

        @pcwalton That's a thing now?

        1 reply 0 retweets 0 likes
      3. Brendan G Bohannon‏ @cr88192 8 Mar 2016
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        Replying to @scottmichaud

        @scottmichaud @pcwalton I think the issue is more with compilers doing optimizations which violate common assumptions about C's semantics.

        3 replies 0 retweets 0 likes
      4. 21 more replies
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      2. Fabian Giesen‏ @rygorous 8 Mar 2016
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        Replying to @pcwalton

        @pcwalton The backlash isn't about optimizing compilers per se, but about creeping semantic shifts to enable new opts that break old code.

        1 reply 0 retweets 0 likes
      3. Fabian Giesen‏ @rygorous 8 Mar 2016
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        Replying to @rygorous

        @pcwalton The biggest offender for sure is overzealous UB exploitation (primarily a C/C++ issue), but there are other issues like that.

        2 replies 0 retweets 0 likes
      4. 12 more replies
      1. Patrick Walton‏ @pcwalton 8 Mar 2016
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        @jamiiecb @davecheney Sure, but that doesn't mean we don't need optimizations. :)

        0 replies 0 retweets 0 likes
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      1. New conversation
      2. Dave Cheney‏ @davecheney 8 Mar 2016
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        Replying to @pcwalton

        @pcwalton it's very much a case of throwing the baby out with the bath water, the problem is not -O, but undefined behaviour.

        2 replies 5 retweets 8 likes
      3. Bálint Szilakszi‏ @szbalint 9 Mar 2016
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        Replying to @davecheney

        @davecheney @pcwalton undefined behaviour which compilers interpret as a licence to kill. They need to pick safety/correctness over speed.

        1 reply 0 retweets 0 likes
      4. 5 more replies
      1. New conversation
      2. comex‏ @comex 9 Mar 2016
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        Replying to @johnregehr

        @johnregehr have you tried reading unoptimized Rust assembly :)

        2 replies 0 retweets 2 likes
      3. Graham Sutherland (Polynomial^DSS)‏ @gsuberland 9 Mar 2016
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        Replying to @comex

        @comex @johnregehr Can't be any worse than unoptimized Haskell assembly.

        0 replies 0 retweets 1 like
      4. End of conversation
      1. Billy O'Neal‏ @MalwareMinigun 8 Mar 2016
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        Replying to @pcwalton

        @pcwalton @sehetw it's the "assume undefined behavior that real programs used is license to change stuff" being bashed; not optimizers

        0 replies 0 retweets 2 likes
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