<html lang="en"> <head> <title>MMIX-Syntax - Using as</title> <meta http-equiv="Content-Type" content="text/html"> <meta name="description" content="Using as"> <meta name="generator" content="makeinfo 4.13"> <link title="Top" rel="start" href="index.html#Top"> <link rel="up" href="MMIX_002dDependent.html#MMIX_002dDependent" title="MMIX-Dependent"> <link rel="prev" href="MMIX_002dExpand.html#MMIX_002dExpand" title="MMIX-Expand"> <link rel="next" href="MMIX_002dmmixal.html#MMIX_002dmmixal" title="MMIX-mmixal"> <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> <!-- This file documents the GNU Assembler "as". Copyright (C) 1991-2015 Free Software Foundation, Inc. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, with no Front-Cover Texts, and with no Back-Cover Texts. A copy of the license is included in the section entitled ``GNU Free Documentation License''. --> <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 } span.sc { font-variant:small-caps } span.roman { font-family:serif; font-weight:normal; } span.sansserif { font-family:sans-serif; font-weight:normal; } --></style> </head> <body> <div class="node"> <a name="MMIX-Syntax"></a> <a name="MMIX_002dSyntax"></a> <p> Next: <a rel="next" accesskey="n" href="MMIX_002dmmixal.html#MMIX_002dmmixal">MMIX-mmixal</a>, Previous: <a rel="previous" accesskey="p" href="MMIX_002dExpand.html#MMIX_002dExpand">MMIX-Expand</a>, Up: <a rel="up" accesskey="u" href="MMIX_002dDependent.html#MMIX_002dDependent">MMIX-Dependent</a> <hr> </div> <h4 class="subsection">9.28.3 Syntax</h4> <p>The assembly syntax is supposed to be upward compatible with that described in Sections 1.3 and 1.4 of ‘<samp><span class="samp">The Art of Computer Programming, Volume 1</span></samp>’. Draft versions of those chapters as well as other MMIX information is located at <a name="mmixsite"></a><a href="http://www-cs-faculty.stanford.edu/~knuth/mmix-news.html">http://www-cs-faculty.stanford.edu/~knuth/mmix-news.html</a>. Most code examples from the mmixal package located there should work unmodified when assembled and linked as single files, with a few noteworthy exceptions (see <a href="MMIX_002dmmixal.html#MMIX_002dmmixal">MMIX-mmixal</a>). <p>Before an instruction is emitted, the current location is aligned to the next four-byte boundary. If a label is defined at the beginning of the line, its value will be the aligned value. <p>In addition to the traditional hex-prefix ‘<samp><span class="samp">0x</span></samp>’, a hexadecimal number can also be specified by the prefix character ‘<samp><span class="samp">#</span></samp>’. <p>After all operands to an MMIX instruction or directive have been specified, the rest of the line is ignored, treated as a comment. <ul class="menu"> <li><a accesskey="1" href="MMIX_002dChars.html#MMIX_002dChars">MMIX-Chars</a>: Special Characters <li><a accesskey="2" href="MMIX_002dSymbols.html#MMIX_002dSymbols">MMIX-Symbols</a>: Symbols <li><a accesskey="3" href="MMIX_002dRegs.html#MMIX_002dRegs">MMIX-Regs</a>: Register Names <li><a accesskey="4" href="MMIX_002dPseudos.html#MMIX_002dPseudos">MMIX-Pseudos</a>: Assembler Directives </ul> </body></html>