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102 lines
4.4 KiB
HTML
102 lines
4.4 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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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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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>CRIS-Expand (Using as)</title>
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<meta name="description" content="CRIS-Expand (Using as)">
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<meta name="keywords" content="CRIS-Expand (Using as)">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="CRIS_002dDependent.html#CRIS_002dDependent" rel="up" title="CRIS-Dependent">
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<link href="CRIS_002dSymbols.html#CRIS_002dSymbols" rel="next" title="CRIS-Symbols">
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<link href="CRIS_002dOpts.html#CRIS_002dOpts" rel="prev" title="CRIS-Opts">
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</head>
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<body lang="en">
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<a name="CRIS_002dExpand"></a>
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<div class="header">
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<p>
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Next: <a href="CRIS_002dSymbols.html#CRIS_002dSymbols" accesskey="n" rel="next">CRIS-Symbols</a>, Previous: <a href="CRIS_002dOpts.html#CRIS_002dOpts" accesskey="p" rel="prev">CRIS-Opts</a>, Up: <a href="CRIS_002dDependent.html#CRIS_002dDependent" accesskey="u" rel="up">CRIS-Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Instruction-expansion"></a>
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<h4 class="subsection">9.8.2 Instruction expansion</h4>
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<a name="index-instruction-expansion_002c-CRIS"></a>
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<a name="index-CRIS-instruction-expansion"></a>
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<p><code>as</code> will silently choose an instruction that fits
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the operand size for ‘<samp>[register+constant]</samp>’ operands. For
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example, the offset <code>127</code> in <code>move.d [r3+127],r4</code> fits
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in an instruction using a signed-byte offset. Similarly,
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<code>move.d [r2+32767],r1</code> will generate an instruction using a
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16-bit offset. For symbolic expressions and constants that do
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not fit in 16 bits including the sign bit, a 32-bit offset is
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generated.
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</p>
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<p>For branches, <code>as</code> will expand from a 16-bit branch
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instruction into a sequence of instructions that can reach a
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full 32-bit address. Since this does not correspond to a single
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instruction, such expansions can optionally be warned about.
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See <a href="CRIS_002dOpts.html#CRIS_002dOpts">CRIS-Opts</a>.
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</p>
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<p>If the operand is found to fit the range, a <code>lapc</code> mnemonic
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will translate to a <code>lapcq</code> instruction. Use <code>lapc.d</code>
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to force the 32-bit <code>lapc</code> instruction.
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</p>
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<p>Similarly, the <code>addo</code> mnemonic will translate to the
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shortest fitting instruction of <code>addoq</code>, <code>addo.w</code> and
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<code>addo.d</code>, when used with a operand that is a constant known
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at assembly time.
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</p>
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</body>
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</html>
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