GCCasminline..docVIP

1. 简介 1.1 版权和证书. Copyright (C)2003 Sandeep S. This document is free; you can redistribute and/or modify this under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This document is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. 1.2 反馈和更正. Kindly forward feedback and criticism to Sandeep.S. I will be indebted to anybody who points out errors and inaccuracies in this document; I shall rectify them as soon as I am informed. 1.3 Acknowledgments. I express my sincere appreciation to GNU people for providing such a great feature. Thanks to Mr.Pramode C E for all the helps he did. Thanks to friends at the Govt Engineering College, Trichur for their moral-support and cooperation, especially to Nisha Kurur and Sakeeb S. Thanks to my dear teachers at Govt Engineering College, Trichur for their cooperation. Additionally, thanks to Phillip, Brennan Underwood and colin@nyx.net; Many things here are shamelessly stolen from their works. 2. 概述 We are here to learn about GCC inline assembly. 这里的inline表示什么? 我们可以通知编译器插入一段代码到调用函数里面，以表明在哪里被实际调用，这样的函数就是inline函数. 听起来像不像一个Macro? 确实他们相似. inline函数的好处? 这种inlining函数的方法减少了函数调用的开销，并且 And if any of the actual argument values are constant, their known values may permit simplifications at compile time so that not all of the inline function’s code needs to be included. The effect on code size is less predictable, it depends on the particular case. 声明一个内联函数，我们需要在声明的时候使用关键字inline. 现在我们要说什么是inline assembly，它仅仅是一些写成inline函数的assembly routines. 他们handy, speedy 并且在系统编程钟非常有用. 我们主要集中学些基本的格式和(GCC) inline assembly函数的使用.我们使用asm关键字声明inline assembly. Inline assembly is important primarily because of its ability to operate and make its output visible on C variable