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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. void train‏ @rep_stosq_void 3 Aug 2018
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      (memset is also good, but it lacks panache, and it doesn't work if either null pointers or 0.0 are not represented with all bits zero)

      5 replies 0 retweets 2 likes
      Show this thread
    2. Joe Groff‏ @jckarter 3 Aug 2018
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      Replying to @rep_stosq_void

      Watch for those padding bytes though

      1 reply 0 retweets 1 like
    3. void train‏ @rep_stosq_void 3 Aug 2018
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      Replying to @jckarter

      Surely memset does not write to the struct but the the array of characters that represents the struct. So memset is not doing anything illegal. The padding values are guaranteed to be lost with memset, but you could hardly depend on them anyway when not using memset.

      1 reply 0 retweets 0 likes
    4. Joe Groff‏ @jckarter 3 Aug 2018
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      Replying to @rep_stosq_void

      Yeah memsetting padding bytes isn’t illegal, but like you said those zero bytes will get lost if any kind of store forwarding optimization happens. I’ve seen code bitten by assuming memset guarantees zero padding bytes a few times

      1 reply 0 retweets 3 likes
    5. JF Bastien‏ @jfbastien 3 Aug 2018
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      Replying to @jckarter

      I had a recent example, I owe @ohunt...

      2 replies 0 retweets 4 likes
    6. Joe Groff‏ @jckarter 3 Aug 2018
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      Replying to @jfbastien @ohunt

      We had a bunch of fun bugs in Swift on Ubuntu 14.04 because older glibc had padding bytes in significant parts of struct sockaddr

      1 reply 1 retweet 4 likes
    7. Patrick Walton‏ @pcwalton 3 Aug 2018
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      Replying to @jckarter @jfbastien @ohunt

      You want to talk about fun structure padding issues, wait until you try writing Xlib bindings ;)

      1 reply 0 retweets 2 likes
    8. Joe Groff‏ @jckarter 3 Aug 2018
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      Replying to @pcwalton @jfbastien @ohunt

      I would’ve hoped all the cool kids would use xcb by now

      1 reply 0 retweets 0 likes
    9. Patrick Walton‏ @pcwalton 3 Aug 2018
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      Replying to @jckarter @jfbastien @ohunt

      GLX doesn’t work on XCB (as of when I was writing this code a few years ago)

      1 reply 0 retweets 0 likes
    10. Joe Groff‏ @jckarter 3 Aug 2018
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      Replying to @pcwalton @jfbastien @ohunt

      Still?!

      1 reply 0 retweets 0 likes
      Patrick Walton‏ @pcwalton 3 Aug 2018
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      Replying to @jckarter @jfbastien @ohunt

      Looks like it :( https://stackoverflow.com/posts/50086463/revisions …

      11:01 AM - 3 Aug 2018 from Civic Center Tenderloin, San Francisco
      • 2 Likes
      • void train Joe Groff
      0 replies 0 retweets 2 likes

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