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#ieee754

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FCLC<p>Channeling my inner <span class="h-card" translate="no"><a href="https://hachyderm.io/@shafik" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>shafik</span></a></span>, assuming a standard, compliant <a href="https://mast.hpc.social/tags/riscv" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>riscv</span></a> processor, what kind of float instructions can be executed on the vector unit of a processor that advertises </p><p>"RV32IMFDZve64f"</p><p><a href="https://mast.hpc.social/tags/HPC" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>HPC</span></a> <a href="https://mast.hpc.social/tags/IEEE754" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>IEEE754</span></a> <a href="https://mast.hpc.social/tags/SIMD" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>SIMD</span></a> <a href="https://mast.hpc.social/tags/RISCV" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>RISCV</span></a> <a href="https://mast.hpc.social/tags/RVV" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>RVV</span></a> </p><p><a href="https://github.com/riscvarchive/riscv-v-spec/releases/download/v1.0/riscv-v-spec-1.0.pdf" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">github.com/riscvarchive/riscv-</span><span class="invisible">v-spec/releases/download/v1.0/riscv-v-spec-1.0.pdf</span></a></p>
Faith Ekstrand<p>How it started:</p><p>I should write a nifty NIR helper for doing format conversion.</p><p>How it's going:</p><p>Why doesn't our pack function for R11G11B10_FLOAT round or handle denorms properly?!? I should fix that.</p><p>Cursed to understand <a href="https://mastodon.gamedev.place/tags/IEEE754" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>IEEE754</span></a>...</p>
Victor<p><a href="https://mastodon.gamedev.place/tags/Programming" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Programming</span></a> pop quiz. In C++, if you encounter one of the following sections of code. What is the author trying to do?</p><p>// Example 1<br>f += 0.0f;</p><p>// Example 2<br>if( f == 0.0f )<br> f = 0.0f;</p><p><a href="https://mastodon.gamedev.place/tags/cpp" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>cpp</span></a><br><a href="https://mastodon.gamedev.place/tags/IEEE754" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>IEEE754</span></a></p>
Tomasz Nurkiewicz<p><span class="h-card"><a href="https://aus.social/@gurtt" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>gurtt</span></a></span> check out this almost legendary talk about <a href="https://fosstodon.org/tags/JavaScript" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>JavaScript</span></a> and <a href="https://fosstodon.org/tags/Ruby" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Ruby</span></a> quirks: <a href="https://www.destroyallsoftware.com/talks/wat" rel="nofollow noopener" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">destroyallsoftware.com/talks/w</span><span class="invisible">at</span></a>. Just keep in mind that some of them are related to Standard for Floating-Point Arithmetic (<a href="https://fosstodon.org/tags/IEEE754" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>IEEE754</span></a>) not JS per se</p>
Ben Clifford<p>Can I call NaN != NaN a controversy? or how should I describe it.</p><p><a href="https://mastodon.hawaga.org.uk/tags/ieee754" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ieee754</span></a> <a href="https://mastodon.hawaga.org.uk/tags/float" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>float</span></a> <a href="https://mastodon.hawaga.org.uk/tags/controversy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>controversy</span></a></p>
Jens Hannemann<p><span class="h-card"><a href="https://ioc.exchange/@matthew_d_green" class="u-url mention" rel="nofollow noopener" target="_blank">@<span>matthew_d_green</span></a></span> I like to scare my students with the this little gem (and then I explain to them that every computer with an <a href="https://mastodon.online/tags/IEEE" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>IEEE</span></a> 754 compliant <a href="https://mastodon.online/tags/FPU" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>FPU</span></a> will give you the same answer, and for a very good reason)</p><p><a href="https://mastodon.online/tags/FloatingPoint" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>FloatingPoint</span></a> <a href="https://mastodon.online/tags/IEEE754" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>IEEE754</span></a> <a href="https://mastodon.online/tags/STEM" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>STEM</span></a></p>
IT News<p>The Fastest Fourier Transform in the West - An interesting aspect of time-varying waveforms is that by using a trick called a ... - <a href="https://hackaday.com/2022/11/23/the-fastest-fourier-transform-in-the-west/" rel="nofollow noopener" target="_blank"><span class="invisible">https://</span><span class="ellipsis">hackaday.com/2022/11/23/the-fa</span><span class="invisible">stest-fourier-transform-in-the-west/</span></a> <a href="https://schleuss.online/tags/fastfouriertransform" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>fastfouriertransform</span></a> <a href="https://schleuss.online/tags/signalprocessing" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>signalprocessing</span></a> <a href="https://schleuss.online/tags/softwarehacks" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>softwarehacks</span></a> <a href="https://schleuss.online/tags/arduinohacks" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>arduinohacks</span></a> <a href="https://schleuss.online/tags/optimisation" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>optimisation</span></a> <a href="https://schleuss.online/tags/trigonometry" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>trigonometry</span></a> <a href="https://schleuss.online/tags/ieee754" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ieee754</span></a> <a href="https://schleuss.online/tags/julia" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>julia</span></a> <a href="https://schleuss.online/tags/fft" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>fft</span></a></p>
Xe :verified:<p>The Go WebAssembly ABI at a Low Level</p><p><a href="https://xeiaso.net/talks/wasm-abi" rel="nofollow noopener" target="_blank"><span class="invisible">https://</span><span class="">xeiaso.net/talks/wasm-abi</span><span class="invisible"></span></a></p><p><a href="https://pony.social/tags/wasm" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>wasm</span></a> <a href="https://pony.social/tags/golang" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>golang</span></a> <a href="https://pony.social/tags/go" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>go</span></a> <a href="https://pony.social/tags/ieee754" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>ieee754</span></a></p>
JordiGH<p>I think I want to give an in-depth talk about <a href="https://mathstodon.xyz/tags/ieee754" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>IEEE754</span></a> for our local <a href="https://mathstodon.xyz/tags/paperswelove" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>PapersWeLove</span></a> meetup. Rounding modes, NaN bit-patterns, denormalised numbers. The real gory details.</p><p>A standards document is a paper, right?</p>
Yes, I Know IT ! 🎓<p>Understanding "posits", an alternative to the IEEE-754 floating point formats for representing reals:</p><p><a href="https://www.johndcook.com/blog/2018/04/11/anatomy-of-a-posit-number/" rel="nofollow noopener" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">johndcook.com/blog/2018/04/11/</span><span class="invisible">anatomy-of-a-posit-number/</span></a> <a href="https://mastodon.social/tags/floatingpoint" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>FloatingPoint</span></a> <a href="https://mastodon.social/tags/ieee754" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>IEEE754</span></a> <a href="https://mastodon.social/tags/posit" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Posit</span></a></p>
JordiGH<p>Why <a href="https://mathstodon.xyz/tags/nan" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>NaN</span></a> is unequal to itself:</p><p>In <a href="https://mathstodon.xyz/tags/ieee754" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>IEEE754</span></a> <a href="https://mathstodon.xyz/tags/floatingpoint" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>FloatingPoint</span></a> arithmetic, NaN has two meanings: one, the result of an erroneous calculation, and two, missing data. Calculations can be wrong in many ways and data can be missing for many reasons. You can get NaN from calculations such as inf-inf or 0/0, the so-called "indeterminate forms" from calculus.</p><p>So, because NaN is this catch-all for wrong or missing, this collapsed state of multiple states, it's unequal to itself.</p>
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