| --- Log opened Thu Jul 20 00:00:30 2017 |
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| 03:01 | | * Vornicus fiddles with shenzhen i/o, needs apparently two bits. gnah! |
| 03:08 | <~Vornicus> | ah, of course, I get three easily, duh |
| 03:36 | <~Vornicus> | this would be easy but there's too many damn signals. |
| 03:41 | <~Vornicus> | just one too many. |
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| 06:03 | <~Vornicus> | there we are. more code and stuff than y'alls but less power usage |
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| 11:54 | <@Tamber> | "You know how there's that thing going around on the Internet where people say that computers are basically a rock we've tricked into holding lightning? Does that mean people who fix computers are literally rock support?" "...a hard day at the rock-face." |
| 12:17 | < Emmy> | Does that make me a lithomancer? |
| 12:17 | < Emmy> | that sounds pretty damn cool, actually. |
| 12:17 | < Emmy> | BRB adding some details to my job title |
| 12:22 | <@TheWatcher> | I tend to prefer technomancer~ |
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| 13:40 | <&ToxicFrog> | Emmy: I think lithomancers are the people designing the chips themselves |
| 13:41 | < Emmy> | hmmh |
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| 15:33 | <&ToxicFrog> | What the fuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuck: https://github.com/tangxunye/android_vendor_qcom_proprietary/blob/e0666c398903d3 8e72aeda7042ec2836cd3dba68/mm-camera/mm-camera2/media-controller/modules/isp/hw/ modules/rolloff/mlro_to_plro/mlro_utils.c |
| 15:36 | <@Tamber> | ...wait, what. |
| 15:36 | <@Tamber> | ...whaaaaat |
| 15:37 | <@abudhabi> | Hahahaha. |
| 15:38 | <&ToxicFrog> | QualComm, fellow sophonts! Gaze upon their works and despair! |
| 15:38 | <@abudhabi> | Maybe they were working against some hardware-based timing issues, requiring slow sorting. |
| 15:38 | <&ToxicFrog> | abudhabi: the choice of sorting algorithm is so far from being the worst thing wrong with this code |
| 15:53 | <@abudhabi> | Well, the sorting is about the only thing about that code that I understand without spending some time analyzing it, because one-letter variable names and no comments. :V |
| 15:54 | <&ToxicFrog> | abudhabi: so, breaking it down, the actual thing it's computing is (->> x (map abs) (reduce max)), i.e. find the maximum absolute value in x |
| 15:54 | <&ToxicFrog> | It does this by: |
| 15:54 | <&ToxicFrog> | - allocating two new arrays of the same size as x |
| 15:55 | <&ToxicFrog> | - filling one of them with (map abs x) |
| 15:55 | <&ToxicFrog> | - bubble-sorting that array, a process that as a side effect fills the second array with a mapping from [index in sorted array] to [index in original array], so if y[0] is the largest* element, l[0] is the index that y[0] originally occupied in x |
| 15:56 | <&ToxicFrog> | * the bubblesort orders things largest to smallest; this is not documented |
| 15:56 | <&ToxicFrog> | - throwing away the sorted array and instead using the index-to-index mapping to look up the value that ended up at the head of the sorted array in the original array, then returning the abs of that |
| 15:57 | <&ToxicFrog> | Oh, and their bubblesort is O(n^2) and not O(n^2/2) since it doesn't bound the inner loop based on what's already been sorted. |
| 15:58 | <&ToxicFrog> | The whole thing with the array-of-indexes is unnecessarily convoluted and could be replaced with `bubblesort(y, n); double result = y[0]; free(y); return result;` |
| 15:59 | <&ToxicFrog> | But that loses sight of the fact that the entire file could be replaced with `double result = 0.0; for (size_t i = 0; i < n; ++i) { result = max(result, abs(x[i])); } return result;` |
| 16:00 | <@Tamber> | So the bubblesort is just the turd icing on a shit-cake~? |
| 16:03 | <@abudhabi> | Why did they do this? |
| 16:03 | <&ToxicFrog> | abudhabi: I have no idea, but there's a reason everyone who has to work with them hates qualcomm |
| 16:04 | <&ToxicFrog> | Tamber: the turd icing which is itself iced with other, smaller turds, like the fact that it edits one array in-place while also populating a second completely superfluous one and sorting things in reverse order |
| 16:05 | <&ToxicFrog> | I mean, if we know the arrays are going to be small bubblesort might not even be an awful choice for the sorting algorithm, if you can get past the fact that they're using a sort for this at all |
| 16:05 | <@Tamber> | So it's a really really fancy shit-cake! |
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| 18:35 | <&[R]> | https://twitter.com/EmiratesNBD/status/886863729547149312 |
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| 20:26 | <~Vornicus> | bah. can't *quite* fit it into a single chip. |
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| 21:36 | <@gnolam> | https://twitter.com/i/moments/886241619992862720 |
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| --- Log closed Fri Jul 21 00:00:31 2017 |