<html lang="en"> <head> <title>MIPS autoextend - 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="MIPS_002dDependent.html#MIPS_002dDependent" title="MIPS-Dependent"> <link rel="prev" href="MIPS-assembly-options.html#MIPS-assembly-options" title="MIPS assembly options"> <link rel="next" href="MIPS-insn.html#MIPS-insn" title="MIPS insn"> <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="MIPS-autoextend"></a> <p> Next: <a rel="next" accesskey="n" href="MIPS-insn.html#MIPS-insn">MIPS insn</a>, Previous: <a rel="previous" accesskey="p" href="MIPS-assembly-options.html#MIPS-assembly-options">MIPS assembly options</a>, Up: <a rel="up" accesskey="u" href="MIPS_002dDependent.html#MIPS_002dDependent">MIPS-Dependent</a> <hr> </div> <h4 class="subsection">9.27.7 Directives for extending MIPS 16 bit instructions</h4> <p><a name="index-g_t_0040code_007b_002eset-autoextend_007d-1505"></a><a name="index-g_t_0040code_007b_002eset-noautoextend_007d-1506"></a>By default, MIPS 16 instructions are automatically extended to 32 bits when necessary. The directive <code>.set noautoextend</code> will turn this off. When <code>.set noautoextend</code> is in effect, any 32 bit instruction must be explicitly extended with the <code>.e</code> modifier (e.g., <code>li.e $4,1000</code>). The directive <code>.set autoextend</code> may be used to once again automatically extend instructions when necessary. <p>This directive is only meaningful when in MIPS 16 mode. Traditional MIPS assemblers do not support this directive. </body></html>