65 lines
2.8 KiB
HTML
65 lines
2.8 KiB
HTML
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<html lang="en">
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<head>
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<title>Nops - Using as</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="Using as">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Pseudo-Ops.html#Pseudo-Ops" title="Pseudo Ops">
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<link rel="prev" href="Nolist.html#Nolist" title="Nolist">
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<link rel="next" href="Octa.html#Octa" title="Octa">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled ``GNU Free Documentation License''.
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-->
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<meta http-equiv="Content-Style-Type" content="text/css">
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<style type="text/css"><!--
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pre.display { font-family:inherit }
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span.sansserif { font-family:sans-serif; font-weight:normal; }
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--></style>
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</head>
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<body>
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<div class="node">
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<a name="Nops"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Octa.html#Octa">Octa</a>,
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Previous: <a rel="previous" accesskey="p" href="Nolist.html#Nolist">Nolist</a>,
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Up: <a rel="up" accesskey="u" href="Pseudo-Ops.html#Pseudo-Ops">Pseudo Ops</a>
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<hr>
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</div>
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<h3 class="section">7.65 <code>.nops </code><var>size</var><code>[, </code><var>control</var><code>]</code></h3>
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<p><a name="index-g_t_0040code_007bnops_007d-directive-421"></a><a name="index-filling-memory-with-no_002dop-instructions-422"></a>This directive emits <var>size</var> bytes filled with no-op instructions.
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<var>size</var> is absolute expression, which must be a positve value.
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<var>control</var> controls how no-op instructions should be generated. If
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the comma and <var>control</var> are omitted, <var>control</var> is assumed to be
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zero.
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<p>Note: For Intel 80386 and AMD x86-64 targets, <var>control</var> specifies
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the size limit of a no-op instruction. The valid values of <var>control</var>
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are between 0 and 4 in 16-bit mode, between 0 and 7 when tuning for
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older processors in 32-bit mode, between 0 and 11 in 64-bit mode or when
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tuning for newer processors in 32-bit mode. When 0 is used, the no-op
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instruction size limit is set to the maximum supported size.
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</body></html>
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