64 lines
3.1 KiB
HTML
64 lines
3.1 KiB
HTML
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<html lang="en">
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<head>
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<title>D30V-Size - 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="next" href="D30V_002dSubs.html#D30V_002dSubs" title="D30V-Subs">
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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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<style type="text/css"><!--
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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="D30V-Size"></a>
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<a name="D30V_002dSize"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="D30V_002dSubs.html#D30V_002dSubs">D30V-Subs</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>
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</div>
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<h5 class="subsubsection">9.12.2.1 Size Modifiers</h5>
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<p><a name="index-D30V-size-modifiers-1010"></a><a name="index-size-modifiers_002c-D30V-1011"></a>The D30V version of <code>as</code> uses the instruction names in the D30V
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Architecture Manual. However, the names in the manual are sometimes ambiguous.
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There are instruction names that can assemble to a short or long form opcode.
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How does the assembler pick the correct form? <code>as</code> will always pick the
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smallest form if it can. When dealing with a symbol that is not defined yet when a
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line is being assembled, it will always use the long form. If you need to force the
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assembler to use either the short or long form of the instruction, you can append
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either ‘<samp><span class="samp">.s</span></samp>’ (short) or ‘<samp><span class="samp">.l</span></samp>’ (long) to it. For example, if you are writing
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an assembly program and you want to do a branch to a symbol that is defined later
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in your program, you can write ‘<samp><span class="samp">bra.s foo</span></samp>’.
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Objdump and GDB will always append ‘<samp><span class="samp">.s</span></samp>’ or ‘<samp><span class="samp">.l</span></samp>’ to instructions which
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have both short and long forms.
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</body></html>
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