5.44 Built-in functions for atomic memory access The following builtins are intended to be compatible with those described in the Intel Itanium Processor-specific Application Binary Interface, section 7.4. As such, they depart from the normal GCC practice of using the “__builtin_” prefix, and further that they are overloaded such that they work on multiple types. The definition given in the Intel

CellPerformance Sharing tips and experience with the cell processor, performance, data design and game programming. Recently I've been doing some presentations as well as just general sketches of some things I've been thinking about regarding optimization, concurrency and data design. I've been posting them on Twitter to gather feedback from my pals there. A couple have caused a little controversy

Global Offset TablesYou might have noticed a critical problem with relocations when thinking about the goals of a shared library. We mentioned previously that the big advantage of a shared library with virtual memory is that multiple programs can use the code in memory by sharing of pages.The problem stems from the fact that libraries have no guarantee about where they will be put into memory. The

Welcome to the Linux Assembly website! If you are looking for information on assembly programming under UNIX-like operating systems (Linux/BSD/BeOS/etc), this is the right place to be. Here you can find various resources, ranging from tutorials and documentation, to actual programs written in assembly language. As time passes, we will try to provide as much information on the subject as possible,

Startup state of a Linux/i386 ELF binary Copyright (C) 1999-2000 by Konstantin Boldyshev All information provided here has derived from my own research. So, mistakes and deficiencies could exist. If you find any -- please contact me. Contents 1. Introduction 2. Overview 3. Stack layout 4. Registers 4.1 Linux 2.0 4.2 Linux 2.2 5. Other info 6. Summary 7. Contact 1. Introduction The objective of thi

この上限の値を超過すると数値計算上は無限大と扱われてInfとなります． (上記の記述はSun Forte Developerのマニュアルの「数値計算ガイド」を参考にしました．) (発生場所の特定方法) InfやNaNが発生する場所を特定したい． 演算の結果が上記のInfやNaNとなる時の検出のために SigFPE(Floating Point Exception, 日本語では演算例外もしくは浮動小数点例外) というシグナルがあるのですが，数値計算を行う上では不合理なことに， デフォルトでは演算例外が起こってもSigFPEを発生せずに計算が続行されます． そのため，InfやNanの発生場所の特定のためには， 演算例外でこのSigFPEが発生するようにすればよいことになります． (すると，Kernel側でシグナルを検出してプログラムが停止します．) しかし，デバッグのためにプログラムをわざわざ