Download Hacker's Delight

Download Hacker's Delight

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Hacker's Delight

Download Hacker's Delight

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From the Back Cover

"This is the first book that promises to tell the deep, dark secrets of computer arithmetic, and it delivers in spades. It contains every trick I knew plus many, many more. A godsend for library developers, compiler writers, and lovers of elegant hacks, it deserves a spot on your shelf right next to Knuth." --Josh Bloch "When I first saw the title, I figured that the book must be either a cookbook for breaking into computers (unlikely) or some sort of compendium of little programming tricks. It's the latter, but it's thorough, almost encyclopedic, in its coverage." --Guy SteeleThese are the timesaving techniques relished by computer hackers--those devoted and persistent code developers who seek elegant and efficient ways to build better software. The truth is that much of the computer programmer's job involves a healthy mix of arithmetic and logic. In Hacker's Delight , veteran programmer Hank Warren shares the tricks he has collected from his considerable experience in the worlds of application and system programming. Most of these techniques are eminently practical, but a few are included just because they are interesting and unexpected. The resulting work is an irresistible collection that will help even the most seasoned programmers better their craft. Topics covered include: A broad collection of useful programming tricks Small algorithms for common tasks Power-of-2 boundaries and bounds checking Rearranging bits and bytes Integer division and division by constants Some elementary functions on integers Gray code Hilbert's space-filling curve And even formulas for prime numbers! This book is for anyone who wants to create efficient code. Hacker's Delight will help you learn to program at a higher level--well beyond what is generally taught in schools and training courses--and will advance you substantially further than is possible through ordinary self-study alone. 0201914654B06272002

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About the Author

Henry S. Warren, Jr., has had a forty-year career with IBM, spanning from the IBM 704 to the PowerPC. He has worked on various military command and control systems and on the SETL project under Jack Schwartz at New York University. Since 1973 he has been with IBM's Research Division, focusing on compilers and computer architectures. Hank currently works on the Blue Gene petaflop computer project. He received his Ph.D. in computer science from the Courant Institute at New York University. 0201914654AB06272002

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Product details

Hardcover: 306 pages

Publisher: Addison-Wesley; 1st edition (July 27, 2002)

Language: English

ISBN-10: 0201914654

ISBN-13: 978-0201914658

Product Dimensions:

6.5 x 0.8 x 9.4 inches

Shipping Weight: 1.3 pounds

Average Customer Review:

4.5 out of 5 stars

28 customer reviews

Amazon Best Sellers Rank:

#792,770 in Books (See Top 100 in Books)

The book is full of crazy cool tricks built of C/assembly code and magic values. If you need to optimize your bit twiddling and integer math, this has much to offer. Interestingly, its applications are broader than you'd originally think. Useful for squeezing the last bit of speed out of your library functions.

Warren was one of the editors of the PowerPC compiler guide and that book had two neat chapeters, "Clever Examples," and "Optimal Code Sequences," which introduced the use of the gnu superoptimzer. The PPC Compiler Writer's guide was useful for more than Compiler Writers! Warren's book Hacker's Delight is a greatly expanded version of that material. He introduces a basic RISC and proceeds to give C, pseudocode and basic RISC assembly for many different operations. What distinguishes Hacker's Delight is that he goes into cycle counts and optimzation strategies for some of the algorithims and analyzes tradeoffs for different solutions. Some of bits I have applied the techniques to my day job are in ch. 7: Rearranging Bits and Bytes and Chs. 5 & 6 "Counting Bits" and "Searching Words" There is some good material on computer arithmetic including using a radix -2 system, and a chapter on Hilbert's Curves as well as Primes, which I haven't gotten a chance to enjoy yet. Be sure to check his website for errata and some additional material. Highly Recommended.

I feel compelled to point out that this book is _not_ a few things: It's not a book that teaches you how to break into computers, or crack codes. It's also not the kind of book that teaches you how to do something which you don't know how to do.This book is a collection of tricks that show the reader better ways to do things they already know how to do. And it's also a book that can give the reader insight into different approaches and mechanisms for solving problems.Computer programmers translate their ideas and requirements into any of several computer languages. Those expressions are limited by the language the programmer is using, and maybe even the machine the programmer is targeting. But there is a wide continum of expressions that result in the same -- hopefully correct -- results. Choosing the most efficient, and most elegant, expression to some is "real" hacking.This book is for real hackers. It's a great collection of tricks for performing usually simple operations in an elegant way. What's elegant? Well, elegant is efficeint. If there's a side-effect of an elegant operation, it turns out that side-effect is probably useful and not simply discarded.This book catalogs insights into concrete binary math, shortcuts derived from different boolean operators, and even approaches some interesting numerical analysis problems.If you already know how to write software, and you already know you want to find faster or more efficient ways to check for overflows on integers, divide nubmers, count bits, search for binary patterns, or do other twiddling, then this book is for you.If the application of such techniques doesn't seem important to you, then this book probably isn't going to be of interest to you.

A few I'd seen over a (large) number of years. Many more I wouldn't have thought of.

Most of the stuff in this book, usually also more updated, is of course available on the web. I knew most of the tricks from Agner Fog's works, the 'aggregate magic algorithms' and other sources. But that is hardly a critique of this book.This book also *explains* the tricks very clearly. That's why it rocks. Warren doesn't talk to you like a professor, but like a good friend. He explains stuff, often in plain English, the way we all do when we really want someone to understand what we mean.He uses some math too, but only when really appropriate, never in a pedantic way or to impress us with his vast knowledge (like a professor would).This book sports a quick little introduction to RISC assembly, a couple of silly little poems, formulas for prime numbers... how can I explain it?

I really enjoy the information in this book. I am constantly writing programs for microcontrollers and books like one really aid the creative thinking.

This is great book that you must have somewhere around when you are writing some code. But I must say that this book is, in some way, Introduction to Donald Knuth's books: Concrete Mathematics: A Foundation for Computer Science (Concrete Mathematics: A Foundation for Computer Science (2nd Edition)) and The art of computer Programming (The Art of Computer Programming, Volumes 1-4A Boxed Set (Box Set)).In any way, buy this book, it is worth every penny and something you must read if you are CS student or you have interest in programming and math.

This is a truly exceptional book for learning fast implementations of the base-2 operations that are used to do arithmetic and comparison on computers. It's a great reference to have in my opinion.

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