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UPDATES

Beware of Unverified TLS Certificates in PHP & Python

TLS certificate verification when using third-party APIs. 4 years ago

Calculating day of week and Easter date

A branchless code for calculating day of week, Easter date, and Jewish holidays.
5 years ago

Using DAWG for predictive text input

How to find words by their prefix, which can be mistyped, and sort them by
frequency stored with the word. 11 years ago

Recommended books and sites

Intel® Architecture Instruction Set Extensions Programming Reference (PDF
reference). The description of new instructions in the upcoming Haswell
processor, including transactional memory support, hardware random number
generator, and 256-bit vector integer operations. The transactional memory
instructions should be useful for GIL (global interpreter lock) in Python and
Ruby. They tried to eliminate it with software TM, but it was too slow. 11 years
ago

Win32 Assembly Cheat Sheet

Added Serbo-Croatian translation 11 years ago


COMMENTS

Santiago Fiorino:

gracias capo 11 days ago

Chief Bridge Fuser:

Thank you! Your derivation saved me thinking! 23 days ago

Peter Kankowski:

Hi Nicolas, thank you so much. Yes, it's a good solution. The code will be a bit
longer, but no need to put the extra 3 bytes as you said 4 months ago

Nicolas :

1st check if the start of your string is sizeof(unsigned) aligned. If not check
the first few bytes that are not aligned one by one. Then check the aligned
unsigned... 4 months ago

Peter Kankowski:

ammendes, thank you so much 1 year ago



GENERAL

Discussion: the first language

Which programming language to learn first?

Recommended books and sites

The minimal reading list to become a good programmer.

New links: 2011

Important news, interesting finds.

Thoughts on Windows Phone 7

Why there are no serious WP7 apps.


ALGORITHMS

Hash functions: An empirical comparison

Benchmark program for hash tables and comparison of 15 popular hash functions.

Plural forms

Spelling messages like "1 file found" or "5 files found" correctly in any
language.

Two-stage tables for storing Unicode character properties

A data structure for storing the properties of Unicode characters.

Using ternary DAGs for spelling correction

A ternary structure for storing dictionaries is proposed. The structure is based
on ternary search trie that is "compressed" into a DAG by linking together equal
subtrees. By using it, you can eliminate affix stripping and implement a faster
spelling corrector.

Searching for duplicate files

Designing an effective algorithm for finding identical files.

Natural order sorting

How to sort filenames like Picture17.png.

Using DAWG for predictive text input

How to find words by their prefix, which can be mistyped, and sort them by
frequency stored with the word.

Calculating day of week and Easter date

A branchless code for calculating day of week, Easter date, and Jewish holidays.


ASSEMBLY LANGUAGE AND MACHINE CODE

Win32 Assembly Cheat Sheet

One-page reference for Win32 assembly language programming.

x86 Machine Code Statistics

Which instructions and addressing modes are used most often. What is the average
instruction length.

Redundancy of x86 Machine Code

One assembly language instruction can be encoded differently in machine code.
Possible applications are steganography and compiler identification.


INTERFACES

PHP database library

Designing a database interface for web programming.

Metaprogramming with aggressive inlining

Inlined and optimized functions can be used as macros.

Software interface design tips

How to design easy-to-use interfaces between modules of your program.


INTERPRETERS AND COMPILERS

Introduction: Writing a simple expression evaluator



Code generator



Reverse Polish Notation and Expression Compiler



Adding variables to expression evaluator

Four-part series about creating an expressing evaluator.

Python critique

You should choose between Python 2 and 3, find a good book, and keep in mind the
diverse data types.

The future of compilers

How programming languages may look in future.


WIN32 PROGRAMMING

Self-extracting executables

Techniques for creating SFX archives and interpreters.

Enabling additional compiler warnings

How to catch more bugs with MSVC++.

Detecting access to freed memory

Improving MSVC++ free function.

Debugging buffer overflows

A technique for debugging complex parsers.

Corrections to Raymond Chen's wheel scrolling code

For one rotation of the wheel, never scroll the window by more than one page.

Dark corners in Microsoft's documentation

Hexadecimal locale IDs, saving user data on shutdown, and other bugs.

The perils of alloca function

alloca is useful for small arrays or strings, but can be dangerous if the array
is larger than you expected.


LOW-LEVEL CODE OPTIMIZATION

What your compiler can do for you

You should not obfuscate you code with low-level optimizations: your compiler
can do them for you.

Performance measurements with RDTSC

A method for measuring performance with RDTSC instruction.

Optimized abs function

Branchless abs function for x86 processors.

Calculating standard deviation in one pass

An example of using algebraic transformations for code optimization.

Fast strlen function

Unrolling the loop in strlen function.

Using sentinel for string manipulation

A method for optimizing search functions.

Checking if the point belongs to an interval

How to replace two comparisons with one.

Implementing strcmp, strlen, and strstr using SSE 4.2 instructions

Using new Intel Core i7 instructions to speed up string manipulation.

SSE2 optimised strlen

Optimising strlen function using SSE2 SIMD instructions.

Table-driven approach

How to make you code shorter and easier to maintain by using arrays.

Benchmarking CRC32 and PopCnt instructions

Exploring new instructions in Core i7/i5.

Dynamic arrays in C

A new formula for linearly growing arrays.


WEB PROGRAMMING

JavaScript as the Next Big Language

Predictions and reality.

HTML 5

New features and showcase examples.

Share buttons

Create a widget for sharing your content on social networks.

Beware of Unverified TLS Certificates in PHP & Python

TLS certificate verification when using third-party APIs.
(c) Peter Kankowski, 2006—2023. Some rights reserved.