wefx
vectrig
wefx | vectrig | |
---|---|---|
4 | 1 | |
28 | 6 | |
- | - | |
4.9 | 10.0 | |
4 months ago | almost 13 years ago | |
C | C | |
GNU General Public License v3.0 or later | - |
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wefx
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Cheerp 3.0: The most advanced C++ compiler for the Web now permissively licensed
I'm particularly curious on what parts cheerp adds to their clang+llvm base. Presumably it's something like the C standard target library for WASM/JS?
For reference, here's examples of what you could do with the baseline clang with wasm (but not JS?) [1] [2] [3], referenced from a similar thread on HN.
[1] https://github.com/ern0/howto-wasm-minimal
[2] https://github.com/robrohan/wefx
[3] https://github.com/PetterS/clang-wasm
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The Tools I Use to Write Books (2018)
I've used a similar pipeline to create "books for code and infrastructure". A/k/a coding in a somewhat literate programming style. Similar to what is described here:
gemini://gemini.robrohan.com/2022-04-23-narrative-programming.md
With output that looks similar to this: https://github.com/robrohan/wefx/blob/main/docs/manual.pdf
Using a github action like this: https://github.com/robrohan/wefx/blob/main/.github/workflows...
(most of the code borrowed from those projects)
You can do it with just plain markdown files and use directories for chapters / organization if you're just going for prose.
I've thought about using the process to try to make open textbooks where you can mix and match chapters, but I don't have any experience in that field.
Anyway, can confirm, it's an incredibly useful process.
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Show HN: How to compile C/C++ for WASM, pure Clang, no libs, no framework
Not trying to steal your thunder, but here is another nostdlib clang -> wasm example with malloc, a few math functions, rand, and writing to a canvas doing animation.
=> https://github.com/robrohan/wefx
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Implementing Cosine in C from Scratch
I haven’t seen this version mentioned in the thread - if you don’t need a lot of precision, here is a simple 4 line version[1] and here’s how it works[2].
Not sure who initially came up with it.
[1] https://github.com/robrohan/wefx/blob/1a918cc2d5ad87402a3830...
[2] https://www.desmos.com/calculator/lo7cf60mjz
vectrig
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Implementing Cosine in C from Scratch
Thanks for explaining this. I actually wrote a SIMD implementation of trig functions years ago, using the techniques you describe.
You can check it out: https://github.com/jeremysalwen/vectrig
I compared several different methods of generating polynomials of different sizes for speed and precision (spoilers: taylor series were the worst and minimax polynomials (Remez algorithm) were the best).
Another (surprising) thing which I learned during the project was that the range reduction was just as (if not more) important to the accuracy of the implementation than the polynomial. If you think about it, you will realize that it's actually pretty difficult to quickly and accurately compute the sin of large numbers like 2^50.
I also tried to directly optimize the coefficients for the accuracy of the polynomial on the required range, but that experiment was unsuccessful.
It's all there in the repository, the implementations, notes about the different polynomials used, and the accuracy/speed statistics for the different methods.
What are some alternatives?
pure-data - Pure Data - a free real-time computer music system
v7unix - Version 7 Unix for a POSIX world
chip8-book - An introduction to Chip-8 emulation using Rust
musl - unofficial musl mirror git://git.musl-libc.org/musl
cib - clang running in browser (wasm)
clang-wasm - How to build webassembly files with nothing other than standard Clang/llvm.
scratch-www - Standalone web client for Scratch
wasm-fizzbuzz - WebAssembly from Scratch: From FizzBuzz to DooM.
supercollider - An audio server, programming language, and IDE for sound synthesis and algorithmic composition.