64 lines
3 KiB
HTML
64 lines
3 KiB
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<head>
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<title>D30V-Subs - Using as</title>
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<meta name="description" content="Using as">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="D30V_002dSyntax.html#D30V_002dSyntax" title="D30V-Syntax">
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<link rel="prev" href="D30V_002dSize.html#D30V_002dSize" title="D30V-Size">
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<link rel="next" href="D30V_002dChars.html#D30V_002dChars" title="D30V-Chars">
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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, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
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2006, 2007 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 1.1
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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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--></style>
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</head>
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<body>
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<div class="node">
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<p>
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<a name="D30V_002dSubs"></a>Next: <a rel="next" accesskey="n" href="D30V_002dChars.html#D30V_002dChars">D30V-Chars</a>,
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Previous: <a rel="previous" accesskey="p" href="D30V_002dSize.html#D30V_002dSize">D30V-Size</a>,
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Up: <a rel="up" accesskey="u" href="D30V_002dSyntax.html#D30V_002dSyntax">D30V-Syntax</a>
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<hr><br>
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</div>
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<h5 class="subsubsection">9.9.2.2 Sub-Instructions</h5>
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<p><a name="index-D30V-sub_002dinstructions-756"></a><a name="index-sub_002dinstructions_002c-D30V-757"></a>The D30V assembler takes as input a series of instructions, either one-per-line,
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or in the special two-per-line format described in the next section. Some of these
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instructions will be short-form or sub-instructions. These sub-instructions can be packed
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into a single instruction. The assembler will do this automatically. It will also detect
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when it should not pack instructions. For example, when a label is defined, the next
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instruction will never be packaged with the previous one. Whenever a branch and link
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instruction is called, it will not be packaged with the next instruction so the return
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address will be valid. Nops are automatically inserted when necessary.
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<p>If you do not want the assembler automatically making these decisions, you can control
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the packaging and execution type (parallel or sequential) with the special execution
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symbols described in the next section.
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</body></html>
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