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📁 自己收集的linux入门到学懂高级编程书集包括linux程序设计第三版
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<html lang="en"><head><title>Using the GNU Compiler Collection (GCC)</title><meta http-equiv="Content-Type" content="text/html"><meta name="description" content="Using the GNU Compiler Collection (GCC)"><meta name="generator" content="makeinfo 4.6"><!--Copyright &copy; 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.   <p>Permission is granted to copy, distribute and/or modify this documentunder the terms of the GNU Free Documentation License, Version 1.2 orany later version published by the Free Software Foundation; with theInvariant Sections being "GNU General Public License" and "FundingFree Software", the Front-Cover texts being (a) (see below), and withthe Back-Cover Texts being (b) (see below).  A copy of the license isincluded in the section entitled "GNU Free Documentation License".   <p>(a) The FSF's Front-Cover Text is:   <p>A GNU Manual   <p>(b) The FSF's Back-Cover Text is:   <p>You have freedom to copy and modify this GNU Manual, like GNU     software.  Copies published by the Free Software Foundation raise     funds for GNU development.--><meta http-equiv="Content-Style-Type" content="text/css"><style type="text/css"><!--  pre.display { font-family:inherit }  pre.format  { font-family:inherit }  pre.smalldisplay { font-family:inherit; font-size:smaller }  pre.smallformat  { font-family:inherit; font-size:smaller }  pre.smallexample { font-size:smaller }  pre.smalllisp    { font-size:smaller }--></style></head><body><div class="node"><p>Node:&nbsp;<a name="Hints%20implementation">Hints implementation</a>,Next:&nbsp;<a rel="next" accesskey="n" href="Structures-unions-enumerations-and-bit-fields-implementation.html#Structures%20unions%20enumerations%20and%20bit-fields%20implementation">Structures unions enumerations and bit-fields implementation</a>,Previous:&nbsp;<a rel="previous" accesskey="p" href="Arrays-and-pointers-implementation.html#Arrays%20and%20pointers%20implementation">Arrays and pointers implementation</a>,Up:&nbsp;<a rel="up" accesskey="u" href="C-Implementation.html#C%20Implementation">C Implementation</a><hr><br></div><h3 class="section">Hints</h3>     <ul><li><cite>The extent to which suggestions made by using the </cite><code>register</code><cite>storage-class specifier are effective (6.7.1).</cite>     <p>The <code>register</code> specifier affects code generation only in these ways:          <ul><li>When used as part of the register variable extension, see<a href="Explicit-Reg-Vars.html#Explicit%20Reg%20Vars">Explicit Reg Vars</a>.          <li>When <code>-O0</code> is in use, the compiler allocates distinct stackmemory for all variables that do not have the <code>register</code>storage-class specifier; if <code>register</code> is specified, the variablemay have a shorter lifespan than the code would indicate and may neverbe placed in memory.          <li>On some rare x86 targets, <code>setjmp</code> doesn't save the registers inall circumstances.  In those cases, GCC doesn't allocate any variablesin registers unless they are marked <code>register</code>.     </ul>     <li><cite>The extent to which suggestions made by using the inline functionspecifier are effective (6.7.4).</cite>     <p>GCC will not inline any functions if the <code>-fno-inline</code> option isused or if <code>-O0</code> is used.  Otherwise, GCC may still be unable toinline a function for many reasons; the <code>-Winline</code> option may beused to determine if a function has not been inlined and why not.</ul>   </body></html>
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