📄 constraints.html
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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 © 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: <a name="Constraints">Constraints</a>,Next: <a rel="next" accesskey="n" href="Asm-Labels.html#Asm%20Labels">Asm Labels</a>,Previous: <a rel="previous" accesskey="p" href="Extended-Asm.html#Extended%20Asm">Extended Asm</a>,Up: <a rel="up" accesskey="u" href="C-Extensions.html#C%20Extensions">C Extensions</a><hr><br></div><h3 class="section">Constraints for <code>asm</code> Operands</h3><p>Here are specific details on what constraint letters you can use with<code>asm</code> operands. Constraints can say whetheran operand may be in a register, and which kinds of register; whether theoperand can be a memory reference, and which kinds of address; whether theoperand may be an immediate constant, and which possible values it mayhave. Constraints can also require two operands to match.<ul class="menu"><li><a accesskey="1" href="Simple-Constraints.html#Simple%20Constraints">Simple Constraints</a>: Basic use of constraints. <li><a accesskey="2" href="Multi-Alternative.html#Multi-Alternative">Multi-Alternative</a>: When an insn has two alternative constraint-patterns. <li><a accesskey="3" href="Modifiers.html#Modifiers">Modifiers</a>: More precise control over effects of constraints. <li><a accesskey="4" href="Machine-Constraints.html#Machine%20Constraints">Machine Constraints</a>: Special constraints for some particular machines. </ul> </body></html>⌨️ 快捷键说明
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