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94 lines
5.5 KiB
HTML
94 lines
5.5 KiB
HTML
15 years ago
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<title>Xtensa Options - Using as</title>
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<meta name="description" content="Using as">
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<meta name="generator" content="makeinfo 4.7">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Xtensa_002dDependent.html#Xtensa_002dDependent" title="Xtensa-Dependent">
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<link rel="next" href="Xtensa-Syntax.html#Xtensa-Syntax" title="Xtensa Syntax">
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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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man end-->
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<style type="text/css"><!--
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span.roman { font-family: 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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<p>
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<a name="Xtensa-Options"></a>Next: <a rel="next" accesskey="n" href="Xtensa-Syntax.html#Xtensa-Syntax">Xtensa Syntax</a>,
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Up: <a rel="up" accesskey="u" href="Xtensa_002dDependent.html#Xtensa_002dDependent">Xtensa-Dependent</a>
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<hr><br>
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</div>
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<h4 class="subsection">9.36.1 Command Line Options</h4>
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<p>The Xtensa version of the <span class="sc">gnu</span> assembler supports these
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special options:
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<dl>
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<dt><code>--text-section-literals | --no-text-section-literals</code><dd><a name="index-_002d_002dtext_002dsection_002dliterals-1837"></a><a name="index-_002d_002dno_002dtext_002dsection_002dliterals-1838"></a>Control the treatment of literal pools. The default is
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<span class="samp">--no-text-section-literals</span>, which places literals in
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separate sections in the output file. This allows the literal pool to be
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placed in a data RAM/ROM. With <span class="samp">--text-section-literals</span>, the
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literals are interspersed in the text section in order to keep them as
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close as possible to their references. This may be necessary for large
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assembly files, where the literals would otherwise be out of range of the
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<code>L32R</code> instructions in the text section. These options only affect
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literals referenced via PC-relative <code>L32R</code> instructions; literals
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for absolute mode <code>L32R</code> instructions are handled separately.
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See <a href="Literal-Directive.html#Literal-Directive">literal</a>.
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<br><dt><code>--absolute-literals | --no-absolute-literals</code><dd><a name="index-_002d_002dabsolute_002dliterals-1839"></a><a name="index-_002d_002dno_002dabsolute_002dliterals-1840"></a>Indicate to the assembler whether <code>L32R</code> instructions use absolute
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or PC-relative addressing. If the processor includes the absolute
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addressing option, the default is to use absolute <code>L32R</code>
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relocations. Otherwise, only the PC-relative <code>L32R</code> relocations
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can be used.
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<br><dt><code>--target-align | --no-target-align</code><dd><a name="index-_002d_002dtarget_002dalign-1841"></a><a name="index-_002d_002dno_002dtarget_002dalign-1842"></a>Enable or disable automatic alignment to reduce branch penalties at some
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expense in code size. See <a href="Xtensa-Automatic-Alignment.html#Xtensa-Automatic-Alignment">Automatic Instruction Alignment</a>. This optimization is enabled by default. Note
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that the assembler will always align instructions like <code>LOOP</code> that
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have fixed alignment requirements.
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<br><dt><code>--longcalls | --no-longcalls</code><dd><a name="index-_002d_002dlongcalls-1843"></a><a name="index-_002d_002dno_002dlongcalls-1844"></a>Enable or disable transformation of call instructions to allow calls
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across a greater range of addresses. See <a href="Xtensa-Call-Relaxation.html#Xtensa-Call-Relaxation">Function Call Relaxation</a>. This option should be used when call
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targets can potentially be out of range. It may degrade both code size
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and performance, but the linker can generally optimize away the
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unnecessary overhead when a call ends up within range. The default is
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<span class="samp">--no-longcalls</span>.
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<br><dt><code>--transform | --no-transform</code><dd><a name="index-_002d_002dtransform-1845"></a><a name="index-_002d_002dno_002dtransform-1846"></a>Enable or disable all assembler transformations of Xtensa instructions,
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including both relaxation and optimization. The default is
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<span class="samp">--transform</span>; <span class="samp">--no-transform</span> should only be used in the
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rare cases when the instructions must be exactly as specified in the
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assembly source. Using <span class="samp">--no-transform</span> causes out of range
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instruction operands to be errors.
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<br><dt><code>--rename-section </code><var>oldname</var><code>=</code><var>newname</var><dd><a name="index-_002d_002drename_002dsection-1847"></a>Rename the <var>oldname</var> section to <var>newname</var>. This option can be used
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multiple times to rename multiple sections.
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</dl>
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</body></html>
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