cauldron
libcperciva
cauldron | libcperciva | |
---|---|---|
25 | 3 | |
117 | 111 | |
- | 0.0% | |
1.2 | 7.9 | |
about 1 year ago | 10 days ago | |
C | C | |
MIT License | GNU General Public License v3.0 or later |
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cauldron
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Many floating-point numbers are in the interval (2017) [0,1]
I've previously written an algorithm that generates random floats in any [a,b], which can generate all possible floating point values, including subnormals, with the proper probability, and does so quickly for any choice of a and b. [0]
[0] https://github.com/camel-cdr/cauldron/blob/main/cauldron/ran...
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Let's implement buffered, formatted output
The major advantage here is that you don't need to parse a dsl, and you can still have formatting options. A final api would probably use automatic compound literal struct arguments to implement default arguments with names parameters.
Type detection should also be possible, although you would need to register all print functions in a global macro.
This is just a proof of concept: https://github.com/camel-cdr/cauldron/blob/main/ideas/fmt.c
This is just a proof of concept: https://github.com/camel-cdr/cauldron/blob/main/ideas/fmt.c
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SIMD-oriented Fast Mersenne Twister in C and non STD library discussion
It really depends on your use case, but I've written a header only PRNG library that might be interesting to you. I've also held a presentation about it, if you are interested in the specifics: "How computers generate random numbers (A guide for programmers)"
- C Posix complaint argument parsing in 42 loc, inspired by Duff's device
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Fast Approximate Gaussian Generator
I've put it through an adapted version of testgauss.c, and it passed the test.
- Single header argument parsing, inspired by plan9's arg(3), in 45 loc
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Designing a new PRNG (Jan 2021)
The entire romu-random.org family is faster than xoshiro256++, atleast in my benchmark:
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Fast (pseudo) RNG?
Now for the self promo: If you are interested in random number generation, check out my presentation on the topic: https://www.youtube.com/watch?v=VHJUlRiRDCY You can also check out my random number library: https://github.com/camel-cdr/cauldron/blob/main/cauldron/random.h
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How to Properly Benchmark C Code
For my benchmarking library, I use macros to tell the compiler not to optimize away a value, pre-running the benchmark to "warm up" the CPU/scheduler and calculate the average and deviation of multiple runs of the benchmark.
libcperciva
- C Posix complaint argument parsing in 42 loc, inspired by Duff's device
- Type-safe generic data structures in C
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Compilers Are Hard
On the topic of compilers being hard: In my repositories I'm carrying around a 5 year old workaround (https://github.com/Tarsnap/libcperciva/commit/92e666e59503de...) for a 6 year old bug (https://bugs.llvm.org/show_bug.cgi?id=21183) in clang/LLVM.
You might think that "incorrect code gets generated" would be a maximum-priority must-fix-before-the-next-release bug in a compiler, but apparently not.
What are some alternatives?
prvhash - PRVHASH - Pseudo-Random-Value Hash. Hash functions, PRNG with unlimited period, randomness extractor, and a glimpse into abyss. (inline C/C++) (Codename Gradilac/Градилак)
stage0 - A set of minimal dependency bootstrap binaries
mersenne-twister-predictor - Predict MT19937 PRNG, from preceding 624 generated numbers. There is a specialization for the "random" of Python standard library.
bug - Scala 2 bug reports only. Please, no questions — proper bug reports only.
frand - A fast userspace CSPRNG
ctl - The C Template Library
Criterion - A cross-platform C and C++ unit testing framework for the 21st century
c4 - C in four functions
STC - A modern, user friendly, generic, type-safe and fast C99 container library: String, Vector, Sorted and Unordered Map and Set, Deque, Forward List, Smart Pointers, Bitset and Random numbers.
ctl - My variant of the C Template Library
dieharder - A fixed version of Robert G. Brown's "dieharder" tests for random number generators.
Klib - A standalone and lightweight C library