bits.stephan-brumme.com
the bit twiddlerBit manipulation explained: the bit twiddler
http://bits.stephan-brumme.com/
Bit manipulation explained: the bit twiddler
http://bits.stephan-brumme.com/
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the bit twiddler | bits.stephan-brumme.com Reviews
https://bits.stephan-brumme.com
Bit manipulation explained: the bit twiddler
bits.stephan-brumme.com
Swap two values
http://bits.stephan-brumme.com/swap.html
For several years, the XOR swap trick served as a common example of bit twiddling. Nowadays, its performance advantage is completely gone, nevertheless, the clever idea behind it remains worth looking at. 0 XOR 0 → 0. 0 XOR 1 → 1. 1 XOR 0 → 1. 1 XOR 1 → 0. That means XORing any bit with itself always gives zero: y XOR y → 0. Moreover, XORing any bit with zero always keeps the bit in its current state: y XOR 0 → 0 XOR y → y. Now it follows: a XOR b XOR a → b. Line 3, line 4. B XOR (a XOR b) = a. The full ...
Position of lowest bit set
http://bits.stephan-brumme.com/lowestBitSet.html
Position of lowest bit set. Only lowest bit will remain 1, all others become 0. The upper 5 bits are unique, skip the rest (32 - 5 = 27). Convert to actual position. X=0 is not properly handled by while-loop. A negative number is usually represented by the two-complement: − x. 1) deletes all but the lowest set bit ( line 11. That means after line 11. We have a power of 2 and there are obviously only 32 possibilities left. When multiplied by the DeBruijn constant 0x077CB531 ( line 13. To 6, line 17. Bull;...
Endianess
http://bits.stephan-brumme.com/endianess.html
16 bit value, represented as 0x0100 on Intel, and 0x0001 else. Access first byte, will be 1 on Intel, and 0 else. The memory layout of numbers depends on the CPU and has to be considered when designing a bit twiddler. Intel's x86 chips (and of cause compatible chips from AMD etc.) rely on "little endian":. Numeric values consisting of multiple bytes have increasing numeric significance with increasing memory addresses. A few CPUs can even switch at runtime like ARM or newer PowerPC or x64. Help me to pay.
Is power of two
http://bits.stephan-brumme.com/isPowerOfTwo.html
Is power of two. The binary representation of a power-of-two 2. Is a 1 followed only by 0s. In such a case, x. Minus; 1 generates a binary number where the 1s turn into 0s and the former 0s turn into 1s. For example, 8 = 1000b and 8 − 1 = 7 = 0111b. Minus; 1 are binary ANDed then the result is only 0 if x. Is a power of two ( line 3. Bull; the algorithm returns true for x. 1, ie they are considered to be a power of two. Help me to pay. Bull; constant time, data independent. Intel Pentium™ D:. Several nam...
Extend bit width
http://bits.stephan-brumme.com/bitExtension.html
Ie to extend from 5 to 8 bits, use extend(x,5,8). Extend and fill lower bits smartly. Especially for graphic cards, values are often truncated to a few bits, i.e. 5 bits per color channel. When used to actually draw pixels, these values have to be extended to 8 bits while preserving three important properties:. 1 scaling must be as linear as possible. 2 zero must remain zero. 3 the maximum possible input must be mapped to the maximum possible output. In the example given, 0x1F is the maximum value. The f...
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The Mersenne Twister Pseudo Random Number Generator
http://create.stephan-brumme.com/mersenne-twister
The Mersenne Twister Pseudo Random Number Generator. August 19, 2014. Is often regarded as the fastest pseudo-random number generator which passes almost all statistical tests. The original C code. Isn't exactly beautiful, therefore I decided to write my one C class. And for the fun of it, I converted the code to Javascript and added a two live demos, too (scroll down. This demo will give you the first 10. Random numbers generated by the Mersenne Twister. Value will change the sequence of random numbers.
Fast CRC32
http://create.stephan-brumme.com/crc32
November 10, 2011. By Stephan Brumme, updated. February 4, 2015. Real life data tends to get corrupted because machines (and humans) are never as reliable as we wish for. One efficient way is make sure your data wasn't unintendedly modifiied is to generate some kind of hash. That hash shall be unique, compact and efficient:. Any kind of modification to the data shall generate a different hash. As few bits or bytes as possible to keep the overhead low. On my blog, too. CRC32 algorithm in C/C . If you aren...
Petit Casse-tête… | L'aventure à Waterloo University
https://ktangao.wordpress.com/2009/04/21/petit-casse-tete
L'aventure à Waterloo University. Avril 21, 2009 à 4:30 · Filed under Tabletops Internship. Nous voulons donc construire une bijection entre l’ensemble fini des entiers. J’attends vos propositions de solutions. Vous pouvez la publier en tant que commentaire a cet post. La solution sera fourni la semaine prochaine! Sur le même thème. Rel="bookmark" title="Permanent link to Petit Casse-tête…" class="permalink" Permalien. 15 commentaires ». Avril 21, 2009 @ 6:00. Avril 21, 2009 @ 7:04. B = n % 256. Une dern...
ritter.vg
https://ritter.vg/resources.html
This obviously is not an exhaustive list of everything, but I tend to use it as a reference point for things that are hard to search for that I want to jot down somewhere. For building a trust path between two keys. Exposes a ton of information across Android devices including sysctls, files, libraries. Mike's Toolbox Enhanced Multi-Threaded SSL/TLS Test Server. A nice site that exposes nearly everything about your client's SSL session: ciphers, extensions, and secrets. Mod rewrite Rule Tester. An awesom...
Sorting STL Containers
http://create.stephan-brumme.com/stl-sort
September 7, 2011. By Stephan Brumme, updated. February 27, 2014. Yes, there is. Yes, it's pretty much the most efficient way to sort generic STL containers. No, it's not perfect. What if the data is already almost sorted? Doesn't benefit a lot from processing already sorted data. However, it's quite common to have (partially) sorted data. Which are sometimes not available for custom containers. The syntax is completely different:. Fill mylist with data . Must use this instead:. Most routines work with.
Drawing Antialiased Circles and Ellipses
http://create.stephan-brumme.com/antialiased-circle
Drawing Antialiased Circles and Ellipses. December 1, 2011. PHP's GD image library can draw all kinds of circles and ellipses. But they look rather ugly because they lack proper antialiasing:. Aside from GD image handling stuff, it's a single line of code:. Img, $width/ 2. Width,$height, $color);. The image above was created by the following PHP file (click show. Draw red ellipse, 2*10px border. Duration = number format. Send PNG to browser. PNG ALL FILTERS);. To be the zoom factor):. Img, $scale);.
vendu/wizardcode
http://vendu.twodots.nl/wizardcode.html
If you want to donate with Paypal. My contact address is tuomoster AT gmail DOT com. Wizard Code on Reddit. Note that I keep updating the book without necessarily changing the draft number so please re-download the file now and again if you are interested. :). If you like the idea of Wizard Code, please read the whole book and send some feedback to tuomoster AT gmail DOT com. This way, the book could be a pleasure to both write and read. Thank you. Button above. :). Useful new features in C99. MMX exampl...
Read-Only Git Access Available
http://create.stephan-brumme.com/misc/git.html
Read-Only Git Access Available. February 15, 2013. If you don't know. Grab one of tutorials on the web. Using My Git Repositories. I added a git repository to these projects on create.stephan-brumme.com. That already came with a big yellow download button, e.g.:. Git clone http:/ create.stephan-brumme.com/crc32/.git. You have read-only access via http and any push will produce an error message. Whenever I update my projects (bugfixes, enhancements, .), you can get the latest version:. Add web server's URL.
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shutterbits
The tech bits of shutterstock. Taking Control of Your Own Curriculum. May 20, 2015. Throughout my career as a software engineer and technology leader, I’ve helped companies find and develop talent. The one constant: how unprepared most college grads are when entering the industry. The process of obtaining a Bachelor’s Degree exposes engineers to new ideas and most importantly, to how to learn. To gain real world skills, developers have to create and take control of their own curriculum. Focus on a specif...
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BITS - IT riešenia pre Vašu firmu | Business IT Solutions
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SmartFoxBits: Flex and Flash UI components for SmartFoxServer
Click here to see how you can create and run a full chat application in a few minutes. Read the detailed features description of the SmartFoxBits components. Download the SmartFoxBits Community Edition right now and start creating your multiuser app or game. Are a set of fully skinnable Flex and Flash UI components specifically designed to be used in conjunction with SmartFoxServer. Check the video linked in the header boxes, showing how to create a complete chat application in just 5 minutes!
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the bit twiddler
What's This Web Site About? Before saying anything else, let's declare the legal stuff: I collected all these little helpful pieces of code on the internet. I, STEPHAN BRUMME, DIDN'T ORIGINALLY INVENT THEM. However, the authors put them into the public domain, which is absolutely great. Do whatever you want with the code, it's okay for commercial stuff, too. Let's call it "tellware" - if you find it useful, tell all your colleagues about it. From the University of Kentucky and "Bit Twiddling Hacks".
אקלקטיקה אהובתי
בעקבות הפח הכחול: למחזר אלקטרוניקה בתל אביב. מאת אבנר שחר קשתן. גם לכם יש את הקופסה הזו במטבח? הקופסה עם הסוללות הגמורות, הטלפון הקודם שנשבר, אולי עוד חלקי אלקטרוניקה שעברו זמנם שלא נעים לזרוק אבל גם אף פעם לא יודעים מה לעשות איתם? במקרה שלי זה כלל גם סנן ונורת UV של מכשיר תמי 4, וגם מוניטור-אינטרקום ישן מהחדר של הילדה, ששרד יפה מאד גם כשהילדה השליכה אותו מהחלון בקומה השניה, אבל בסופו של דבר הלך בדרך כל חשמל, אל השקית העמוסה והמתפוררת שעל שולחן המטבח. ומה אפשר לעשות עם כל הדברים הללו? לאחר היסוסים, העזתי...
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Genom Svenska Bowlingfrbundets satsning p IT och utvecklingen av vrt egna system BITS, kan vi inte bara gra administrationen enklare utan ven gra den tillgnglig fr alla. Nedan fljer en kortare beskrivning om varje sida s du lttare vet var du hittar vilken information. Du kommer tillbaka till startsidan. Hr kan du som administratr loggas in i systemet. Hr finner du aktiva licenser, du kan ska p enstaka personer eller p en hel klubb. Hr finns den faststllda verksamhetsplanen. Manual fr att matchrapportera.
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