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रञ्जित (Ranjit Mathew)A neat explanation:“That XOR Trick” [2020], Florian Hartmann (<a href="https://florian.github.io//xor-trick/" rel="nofollow noopener" translate="no" target="_blank">https://florian.github.io//xor-trick/</a>).On HN: <a href="https://news.ycombinator.com/item?id=25821718" rel="nofollow noopener" translate="no" target="_blank">https://news.ycombinator.com/item?id=25821718</a> & <a href="https://news.ycombinator.com/item?id=44425880" rel="nofollow noopener" translate="no" target="_blank">https://news.ycombinator.com/item?id=44425880</a><a href="https://mastodon.social/tags/XOR" class="mention hashtag" rel="nofollow noopener" target="_blank">#XOR</a> <a href="https://mastodon.social/tags/Bits" class="mention hashtag" rel="nofollow noopener" target="_blank">#Bits</a> <a href="https://mastodon.social/tags/BooleanLogic" class="mention hashtag" rel="nofollow noopener" target="_blank">#BooleanLogic</a> <a href="https://mastodon.social/tags/Tricks" class="mention hashtag" rel="nofollow noopener" target="_blank">#Tricks</a> <a href="https://mastodon.social/tags/BitTwiddling" class="mention hashtag" rel="nofollow noopener" target="_blank">#BitTwiddling</a> <a href="https://mastodon.social/tags/Programming" class="mention hashtag" rel="nofollow noopener" target="_blank">#Programming</a>

रञ्जित (Ranjit Mathew)The mother lode of <a href="https://mastodon.social/tags/BitTwiddling" class="mention hashtag" rel="nofollow noopener" target="_blank">#BitTwiddling</a> tips (apart from the <a href="https://mastodon.social/tags/book" class="mention hashtag" rel="nofollow noopener" target="_blank">#book</a> “Hacker’s Delight”, by Henry S. Warren Jr, and “HAKMEM” by the MIT hackers):“Bit Twiddling Hacks”, Sean Eron Anderson (<a href="https://graphics.stanford.edu/~seander/bithacks.html" rel="nofollow noopener" translate="no" target="_blank">https://graphics.stanford.edu/~seander/bithacks.html</a>).On HN: <a href="https://hn.algolia.com/?dateRange=all&page=0&prefix=false&query=Bit%20Twiddling%20Hacks&sort=byPopularity&type=story" rel="nofollow noopener" translate="no" target="_blank">https://hn.algolia.com/?dateRange=all&page=0&prefix=false&query=Bit%20Twiddling%20Hacks&sort=byPopularity&type=story</a><a href="https://mastodon.social/tags/Math" class="mention hashtag" rel="nofollow noopener" target="_blank">#Math</a> <a href="https://mastodon.social/tags/Optimization" class="mention hashtag" rel="nofollow noopener" target="_blank">#Optimization</a> <a href="https://mastodon.social/tags/Compilers" class="mention hashtag" rel="nofollow noopener" target="_blank">#Compilers</a>

रञ्जित (Ranjit Mathew)This 👇🏽 is good 👌🏽:“A Leap Year Check In Three Instructions”, Falk Hüffner (<a href="https://hueffner.de/falk/blog/a-leap-year-check-in-three-instructions.html" rel="nofollow noopener" translate="no" target="_blank">https://hueffner.de/falk/blog/a-leap-year-check-in-three-instructions.html</a>).Via HN: <a href="https://news.ycombinator.com/item?id=43999748" rel="nofollow noopener" translate="no" target="_blank">https://news.ycombinator.com/item?id=43999748</a>On Lobsters: <a href="https://lobste.rs/s/ybjgex/leap_year_check_three_instructions" rel="nofollow noopener" translate="no" target="_blank">https://lobste.rs/s/ybjgex/leap_year_check_three_instructions</a><a href="https://mastodon.social/tags/Optimization" class="mention hashtag" rel="nofollow noopener" target="_blank">#Optimization</a> <a href="https://mastodon.social/tags/Assembly" class="mention hashtag" rel="nofollow noopener" target="_blank">#Assembly</a> <a href="https://mastodon.social/tags/Compilers" class="mention hashtag" rel="nofollow noopener" target="_blank">#Compilers</a> <a href="https://mastodon.social/tags/GCC" class="mention hashtag" rel="nofollow noopener" target="_blank">#GCC</a> <a href="https://mastodon.social/tags/Math" class="mention hashtag" rel="nofollow noopener" target="_blank">#Math</a> <a href="https://mastodon.social/tags/LeapYear" class="mention hashtag" rel="nofollow noopener" target="_blank">#LeapYear</a> <a href="https://mastodon.social/tags/GregorianCalendar" class="mention hashtag" rel="nofollow noopener" target="_blank">#GregorianCalendar</a> <a href="https://mastodon.social/tags/BitTwiddling" class="mention hashtag" rel="nofollow noopener" target="_blank">#BitTwiddling</a> <a href="https://mastodon.social/tags/Speed" class="mention hashtag" rel="nofollow noopener" target="_blank">#Speed</a>

Shane CelisI'm sure this has been done many times before, but I'm still happy to be bit-twiddling in <a href="https://mastodon.gamedev.place/tags/shaders" class="mention hashtag" rel="nofollow noopener" target="_blank">#shaders</a>. The star is this line:(vertex_index & 3u) + (vertex_index >> 2u)"Give me the first two bits but add one if the third bit is set.” The shader generates a UV-mapped quad (right-triangle pair) from the 0 through 5 vertex indices. The screenshot code is abridged; full code is at the link.<a href="https://github.com/shanecelis/bevy/blob/add-viewport-post-processing/crates/bevy_core_pipeline/src/viewport_vertex_shader/viewport.wgsl" rel="nofollow noopener" translate="no" target="_blank">https://github.com/shanecelis/bevy/blob/add-viewport-post-processing/crates/bevy_core_pipeline/src/viewport_vertex_shader/viewport.wgsl</a> <a href="https://mastodon.gamedev.place/tags/gamedev" class="mention hashtag" rel="nofollow noopener" target="_blank">#gamedev</a> <a href="https://mastodon.gamedev.place/tags/bevyengine" class="mention hashtag" rel="nofollow noopener" target="_blank">#bevyengine</a> <a href="https://mastodon.gamedev.place/tags/bittwiddling" class="mention hashtag" rel="nofollow noopener" target="_blank">#bittwiddling</a> <a href="https://mastodon.gamedev.place/tags/wgsl" class="mention hashtag" rel="nofollow noopener" target="_blank">#wgsl</a>

Kernel BobIn 2013, past me wrote some mysterious code. Effectively, it was this. uint8_t decay(uint8_t x) { return (x >> 1) | (x >> 2); }Sort of a low level multiply by 0.75, but with an | instead of a +. The target was an 8 bit AVR. Is there any good reason for using | here? I vaguely remember a bug where certain values didn't decay, but testing shows all 255 nonzero values of x do decay.Any thoughts?<a href="https://chaos.social/tags/CProgramming" class="mention hashtag" rel="nofollow noopener" target="_blank">#CProgramming</a> <a href="https://chaos.social/tags/BitTwiddling" class="mention hashtag" rel="nofollow noopener" target="_blank">#BitTwiddling</a>

Blippy the Wonder Slug (MOVED)Re: coding.If it ain't native ASM, it ain't shit.POP!<a href="https://social.cologne/tags/BitTwiddling" class="mention hashtag" rel="nofollow noopener" target="_blank">#BitTwiddling</a>**scampers away cackling maniacally**

Matthew FlintI made a tiny <a href="https://mastodon.me.uk/tags/Swift" class="mention hashtag" rel="nofollow noopener" target="_blank">#Swift</a> package for decoding Base32 values.<a href="https://gitlab.com/mflint/base32" rel="nofollow noopener" target="_blank">https://gitlab.com/mflint/base32</a><a href="https://mastodon.me.uk/tags/iOSDev" class="mention hashtag" rel="nofollow noopener" target="_blank">#iOSDev</a> <a href="https://mastodon.me.uk/tags/BitTwiddling" class="mention hashtag" rel="nofollow noopener" target="_blank">#BitTwiddling</a>

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