Stephen Canon, Pope Santa IIII

@stephentyrone

Friendly neighborhood math library author at Apple.

Lebanon, NH
Joined June 2010
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  1. Pinned Tweet
    19 Dec 2017
    Replying to and

    3 likes
  2. 2 hours ago

    Put another way: they pay-as-you-can admission policy is *why* I pay extra. If you make everyone pay $25, that’s what I’ll pay from now on, too.

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  3. 2 hours ago

    . $25 is an awful lot of money for a lot of folks that scrounge together a trip to NYC. As someone who paid $1 as a broke college kid and pays $100 now, I hope you reconsider. If it was mandatory when I was in school, I wouldn’t go now.

    1 reply 1 like
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  4. Retweeted
    Jan 4

    FWIW I see nothing about Meltdown that requires OoO execution to leak data. The exact same approach should work on in-order cores that have caches and branch prediction. (Read, basically all but the tiniest microcontrollers.)

    8 replies 40 retweets 101 likes
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  5. Retweeted
    Jan 3

    I’m suspicious of the claim that some CPUs aren’t vulnerable to Spectre attacks. The paper puts it really well. Spectre is like ROP, but the gadgets affect microarch state (caches, branch predictors) instead of architected state (registers, memory) 1/

    3 replies 6 retweets 18 likes
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  6. Jan 3

    Enjoying vacation while the world burns (Geiger Cafe in Gruyères, R has been mollified with a few spoons of the excellent double crème)

    4 replies 13 likes
  7. Jan 3

    I’ve said it before, I’ll say it again.

    Replying to @stephentyrone
    Of course, I'm also of the opinion that side-channel resistance is not actually possible on a general\
    3 replies 1 retweet 4 likes
  8. Dec 31

    (Current status: why am I not sleeping? I should be sleeping.)

    2 likes
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  9. Dec 31

    2 replies 10 likes
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  10. 31 Dec 2017

    YUL✈️GVA🚅🚅🚞🚠🏔⛷

    2 replies 3 likes
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  11. 31 Dec 2017

    Trap doors beneath the Q&A mic stands with a slide that deposits them in a ball pit or shark tank.

    Female speaker gives (great) talk. Male during Q&A gets up and starts to "actually." Female moderator: "Questions only, not comments." Male: finishes his comment, ends by saying "No question." Female moderator: "Does everyone know what a question is?" 🙄🙄🙄🙄🙄☠️
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    3 replies 1 retweet 22 likes
  12. 30 Dec 2017

    I’m a fast walker, but even for me this is pretty ambitious, Maps:

    1 reply 1 like
  13. Retweeted
    30 Dec 2017
    Replying to

    Stating the obvious for the sake of people seeing only your tweet. The problem is not the compiler. The problem is the source language definition. Define a programming language with guarantees about copies of secret data and execution time, then we'll compile it.

    1 reply 7 retweets 28 likes
  14. 30 Dec 2017

    Current status: sewing rabbit fur and imagining life as an early 20th c. arctic explorer.

    1 like
  15. 29 Dec 2017

    so there's no real win here on systems with vaguely reasonable VM.

    3 replies 2 likes
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  16. 29 Dec 2017

    consecutive rows keeps increasing/decreasing by 1). This is a big mass of extra interface weight that AFAIK almost no one actually uses--all it buys you is the ability to represent a matrix 2x larger in the same memory footprint, but blocked LAPACK routines always hit cache, \

    1 reply 1 like
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  17. 29 Dec 2017

    Explanation for the derp crowd: you can represent a symmetric matrix in half the storage (because you get the other half by symmetry). LAPACK and BLAS have a roughly parallel set of interfaces that use such a half-matrix densely packed in memory (i.e. the offset between \

    1 reply 4 likes
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  18. 29 Dec 2017

    Show of hands: have you ever used the hermitian/symmetric *packed* interfaces in LAPACK or BLAS?

    6 replies 1 like
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  19. 29 Dec 2017

    Controversial opinion: if your language cannot encode and check a proof that the carries are correct, it's not "safe" in any sense useful for implementing crypto.

    Your language may be "safe" and you may pass test vectors but reimplementing crypto is *still* a bad idea.
    1 reply 4 retweets 24 likes
  20. 28 Dec 2017

    We have a late contender for peak HN of 2017: "I've never understood the point of Michelin stars or their relative value, compared to, for example, 500 5-star yelp or trip advisor reviews. The last thing I care about is advice on food from a tire company."

    8 replies 14 retweets 77 likes
  21. 28 Dec 2017

    Current status: just explained the geometry of the Borromean Rings to some folks at Walmart.

    1 reply 7 likes

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