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tavianator.com

Personal blog · tavianator.comsystemsprogramming

tavianator.com is a personal blog at tavianator.com about systems and programming. Since 2011, 27 different Hacker News readers have linked it 37 times, most often “Proving that 1 plus 1 equals 10 in Rust”. It is still writing: the last post was on 2025-08-08, and you can follow it by feed.

Visit the blog
37mentions?
27HN people?
2011–2025first – last linked?
Links on Hacker News per year · peak 7 in 2023

Most-linked posts?

  1. Proving that 1 plus 1 equals 10 in Rust
    3 people · 3 mentions · first linked 2020-10-20
  2. Irregular Expressions
    3 people · 3 mentions · first linked 2023-03-08
  3. /2011/ray_box.html
    2 people · 3 mentions · first linked 2021-08-22
  4. You could have invented futexes
    2 people · 2 mentions · first linked 2023-04-26
  5. Cracking DHCE (Diffie-Hellman color exchange)
    2 people · 2 mentions · first linked 2018-01-17
  6. The Alder Lake anomaly, explained
    2 people · 2 mentions · first linked 2025-01-04
  7. The Alder Lake SHLX Anomaly
    2 people · 2 mentions · first linked 2025-01-02

What Hacker News says?

  1. magicalhippo · 2018-08-10
    And in other cases you really do want the infinities. For example fast ray-AABB tests like https://tavianator.com/fast-branchless-raybounding-box-inter...

    Comment linking /fast-branchless-raybounding-box-intersections/

    on “1/0 = 0”
  2. todsacerdoti · 2024-03-20

    Submitted Bug hunting in Btrfs as a story · 243 points

    HN discussion
  3. remexre · 2025-09-08
    > Maybe RISC-V? RISC-V is specified as a RISC (and allows very space-/power-efficient lower-end designs with the classic RISC design), but designed with macro-op fusion in mind, which gets you closer to a CISC decoder and EUs. It's a nice place to be in tooling-wise, but it seems too early to say definitively what extensions will need to be added to get 12900K/9950X/M4 -tier performance-per-core. In either case thou…

    Comment linking /2025/shlx.html

    on “I am giving up on Intel and have bought an AMD Ryzen 9950X3D”
  4. panic · 2025-01-02

    Submitted The Alder Lake SHLX Anomaly as a story · 234 points

    HN discussion
  5. tavianator · 2025-01-04
    Wrote up the presumed explanation here: https://tavianator.com/2025/shlxplained.html

    Comment linking /2025/shlxplained.html

    on “The Alder Lake SHLX Anomaly”
  6. brooke2k · 2025-04-25

    Submitted Parallel ./configure as a story · 219 points

    HN discussion
  7. ChrisLomont · 2021-10-20
    There are algorithms that behave correctly but require intermediate Inf or NaN to work. If I recall there is one related to finding bounding box intersections in ray tracing. I know when I introduce such code into a codebase I put a large "DO NOT CHANGE THIS..." style comment with an explanation so some enterprising programmer doesn't put some if statements in to remove what they think is an error, when it is not. I…

    Comment linking /2011/ray_box.html

    on “Optimizations Enabled by -ffast-Math”
  8. tavianator · 2024-06-27

    Submitted Rounding Percentages as a story · 47 points

    HN discussion
  9. magicalhippo · 2021-08-22
    And there are algorithms that rely on this, like this[1] branchless axis-aligned bounding box intersection test. It exploits the division by zero sign logic of IEEE-754, so that the min/max operations used also handles the edge cases where the ray is parallel to an axis. [1]: https://tavianator.com/2011/ray_box.html

    Comment linking /2011/ray_box.html

    on “One does not simply calculate the absolute value”
  10. signa11 · 2023-04-09

    Submitted Irregular Expressions as a story · 10 points

    HN discussion
  11. magicalhippo · 2023-09-27
    In IEEE 754, division by zero is well defined[1], and some algorithms rely on this[2]. Not sure how it relates to frame lag, some less-than-ideally-implemented iterative routine? [1]: https://en.wikipedia.org/wiki/IEEE_754#Infinities [2]: https://tavianator.com/2011/ray_box.html

    Comment linking /2011/ray_box.html

    on “Why should we not divide by zero?”
  12. thunderbong · 2025-08-11

    Submitted Sneaky Git Commits as a story · 8 points

    HN discussion
  13. bo0tzz · 2025-01-04

    Submitted The Alder Lake anomaly, explained as a story · 8 points

    HN discussion
  14. theamk · 2019-01-18

    Submitted BFS – “find” replacement which does breadth-first search (2016) as a story · 5 points

    HN discussion
  15. based2 · 2018-01-20

    Submitted Cracking DHCE (Diffie-Hellman color exchange) as a story · 4 points

    HN discussion
  16. tavianator · 2022-01-16

    Submitted Long Division as a story · 3 points

    HN discussion
  17. upofadown · 2022-01-04

    Submitted Cracking DHCE (Diffie-Hellman color exchange) (2018) as a story · 3 points

    HN discussion
  18. tavianator · 2020-05-23

    Submitted Porting k-d forests to Rust as a story · 3 points

    HN discussion
  19. ScottWRobinson · 2018-09-22

    Submitted Spawn() of Satan as a story · 3 points

    HN discussion
  20. gregorymichael · 2018-01-17

    Submitted Cracking DHCE (Diffie-Hellman color exchange) as a story · 3 points

    HN discussion
  21. fanf2 · 2025-07-21

    Submitted Remote reboots with encrypted disks on Arch Linux as a story · 2 points

    HN discussion
  22. ingve · 2023-07-19

    Submitted Spawn() of Satan as a story · 2 points

    HN discussion
  23. agluszak · 2020-10-20

    Submitted Proving that 1 plus 1 equals 10 in Rust as a story · 2 points

    HN discussion
  24. javinpaul · 2015-07-12

    Submitted Java autoboxing performance as a story · 2 points

    HN discussion
  25. ethereal · 2011-12-26

    Submitted Solving Cubic Polynomials as a story · 2 points

    HN discussion
  26. fanf2 · 2024-08-12

    Submitted You could have invented futexes as a story · 1 points

    HN discussion
  27. rurban · 2023-07-19

    Submitted Bfs 3.0: The Fastest Find Yet as a story · 1 points

    HN discussion
  28. dmarto · 2023-04-26

    Submitted You could have invented futexes as a story · 1 points

    HN discussion
  29. GarethX · 2023-03-08

    Submitted Irregular Expressions as a story · 1 points

    HN discussion
  30. asicsp · 2023-03-08

    Submitted Irregular expressions (lookahead/lookbehind without backtracking) as a story · 1 points

    HN discussion

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