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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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    1. John Regehr‏ @johnregehr 26 Sep 2019
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      Replying to @lindsey

      there are a lot of good choices depending on what you want to emphasize. I like the Bansal/Aiken paper from ASPLOS '06 a lot, and also "Synthesis of Loop Free Programs" from like PLDI '14

      2 replies 0 retweets 6 likes
    2. JF Bastien‏ @jfbastien 26 Sep 2019
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      Replying to @johnregehr @lindsey

      No STOKE?

      1 reply 0 retweets 1 like
    3. John Regehr‏ @johnregehr 26 Sep 2019
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      Replying to @jfbastien @lindsey

      sorry JF!!!! link a paper man

      1 reply 0 retweets 2 likes
    4. JF Bastien‏ @jfbastien 26 Sep 2019
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      Replying to @johnregehr @lindsey

      I liked this class when I took it in 2012: http://web.stanford.edu/class/cs357/  Alex and David gave the class, with Clark as guest. I'm thinking of this paper: https://raw.githubusercontent.com/StanfordPL/stoke/develop/docs/papers/asplos13.pdf … I still have some notes and the readings. Looks like I did this for the class:https://github.com/jfbastien/BitBlast …

      4 replies 1 retweet 7 likes
    5. Patrick Walton‏ @pcwalton 26 Sep 2019
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      Replying to @jfbastien @johnregehr @lindsey

      I used STOKE once to generate some SIMD code! It was fun

      1 reply 0 retweets 4 likes
    6. Lindsey Kuper‏ @lindsey 26 Sep 2019
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      Replying to @pcwalton @jfbastien @johnregehr

      I think it's so cool that it actually works

      1 reply 0 retweets 1 like
    7. Patrick Walton‏ @pcwalton 26 Sep 2019
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      Replying to @lindsey @jfbastien @johnregehr

      I found STOKE useful as sort of a guide to give me a rough idea of the best way to do something, which I then implemented manually. There’s more work to be done before I’d be comfortable actually shipping the generated code verbatim.

      1 reply 0 retweets 1 like
    8. John Regehr‏ @johnregehr 26 Sep 2019
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      Replying to @pcwalton @lindsey @jfbastien

      basically all superoptimizers to date have this issue, that a human should be in the loop somewhere. it's something I'd like to fix.

      2 replies 0 retweets 1 like
    9. Patrick Walton‏ @pcwalton 26 Sep 2019
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      Replying to @johnregehr @lindsey @jfbastien

      I’m actually OK with this, though. I think I want an “algorithm idea generator” more than a superoptimizer.

      3 replies 0 retweets 1 like
    10. John Regehr‏ @johnregehr 26 Sep 2019
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      Replying to @pcwalton @lindsey @jfbastien

      yeah there's room for a lot of different tools here! the ones I want are those that displace hand-written instcombine and isel.

      1 reply 0 retweets 1 like
      Patrick Walton‏ @pcwalton 26 Sep 2019
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      Replying to @johnregehr @lindsey @jfbastien

      Another example: I just wrote a fragment shader to draw a checkerboard pattern for debugging. There are a lot of ways I can think of to do this and if I actually cared about perf it would be annoying. Would be nice for a tool to just tell me which technique is fastest.

      8:33 PM - 26 Sep 2019
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      • John Regehr
      2 replies 0 retweets 1 like
        1. Patrick Walton‏ @pcwalton 26 Sep 2019
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          Replying to @pcwalton @johnregehr and

          e.g. what I came up with is this. A quick Google search suggests that most people abuse the sign function instead. Which is faster? ¯\_(ツ)_/¯pic.twitter.com/CuvlXQezMU

          0 replies 0 retweets 0 likes
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        1. JF Bastien‏ @jfbastien 26 Sep 2019
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          Replying to @pcwalton @johnregehr @lindsey

          I liked some of what Halide tried to do in that direction, with auto tuning.

          0 replies 0 retweets 0 likes
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