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279 lines
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4 years ago
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<!-- Copyright (C) 1988-2018 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 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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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>MeP Options (Using the GNU Compiler Collection (GCC))</title>
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<meta name="description" content="MeP Options (Using the GNU Compiler Collection (GCC))">
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<meta name="keywords" content="MeP Options (Using the GNU Compiler Collection (GCC))">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Submodel-Options.html#Submodel-Options" rel="up" title="Submodel Options">
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<link href="MicroBlaze-Options.html#MicroBlaze-Options" rel="next" title="MicroBlaze Options">
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<link href="MCore-Options.html#MCore-Options" rel="prev" title="MCore Options">
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</head>
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<body lang="en">
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<a name="MeP-Options"></a>
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<div class="header">
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<p>
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Next: <a href="MicroBlaze-Options.html#MicroBlaze-Options" accesskey="n" rel="next">MicroBlaze Options</a>, Previous: <a href="MCore-Options.html#MCore-Options" accesskey="p" rel="prev">MCore Options</a>, Up: <a href="Submodel-Options.html#Submodel-Options" accesskey="u" rel="up">Submodel Options</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="MeP-Options-1"></a>
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<h4 class="subsection">3.18.24 MeP Options</h4>
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<a name="index-MeP-options"></a>
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<dl compact="compact">
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<dt><code>-mabsdiff</code></dt>
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<dd><a name="index-mabsdiff"></a>
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<p>Enables the <code>abs</code> instruction, which is the absolute difference
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between two registers.
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</p>
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</dd>
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<dt><code>-mall-opts</code></dt>
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<dd><a name="index-mall_002dopts"></a>
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<p>Enables all the optional instructions—average, multiply, divide, bit
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operations, leading zero, absolute difference, min/max, clip, and
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saturation.
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</p>
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</dd>
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<dt><code>-maverage</code></dt>
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<dd><a name="index-maverage"></a>
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<p>Enables the <code>ave</code> instruction, which computes the average of two
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registers.
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</p>
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</dd>
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<dt><code>-mbased=<var>n</var></code></dt>
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<dd><a name="index-mbased_003d"></a>
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<p>Variables of size <var>n</var> bytes or smaller are placed in the
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<code>.based</code> section by default. Based variables use the <code>$tp</code>
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register as a base register, and there is a 128-byte limit to the
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<code>.based</code> section.
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</p>
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</dd>
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<dt><code>-mbitops</code></dt>
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<dd><a name="index-mbitops"></a>
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<p>Enables the bit operation instructions—bit test (<code>btstm</code>), set
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(<code>bsetm</code>), clear (<code>bclrm</code>), invert (<code>bnotm</code>), and
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test-and-set (<code>tas</code>).
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</p>
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</dd>
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<dt><code>-mc=<var>name</var></code></dt>
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<dd><a name="index-mc_003d"></a>
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<p>Selects which section constant data is placed in. <var>name</var> may
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be ‘<samp>tiny</samp>’, ‘<samp>near</samp>’, or ‘<samp>far</samp>’.
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</p>
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</dd>
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<dt><code>-mclip</code></dt>
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<dd><a name="index-mclip"></a>
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<p>Enables the <code>clip</code> instruction. Note that <samp>-mclip</samp> is not
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useful unless you also provide <samp>-mminmax</samp>.
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</p>
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</dd>
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<dt><code>-mconfig=<var>name</var></code></dt>
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<dd><a name="index-mconfig_003d"></a>
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<p>Selects one of the built-in core configurations. Each MeP chip has
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one or more modules in it; each module has a core CPU and a variety of
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coprocessors, optional instructions, and peripherals. The
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<code>MeP-Integrator</code> tool, not part of GCC, provides these
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configurations through this option; using this option is the same as
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using all the corresponding command-line options. The default
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configuration is ‘<samp>default</samp>’.
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</p>
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</dd>
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<dt><code>-mcop</code></dt>
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<dd><a name="index-mcop"></a>
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<p>Enables the coprocessor instructions. By default, this is a 32-bit
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coprocessor. Note that the coprocessor is normally enabled via the
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<samp>-mconfig=</samp> option.
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</p>
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</dd>
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<dt><code>-mcop32</code></dt>
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<dd><a name="index-mcop32"></a>
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<p>Enables the 32-bit coprocessor’s instructions.
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</p>
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</dd>
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<dt><code>-mcop64</code></dt>
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<dd><a name="index-mcop64"></a>
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<p>Enables the 64-bit coprocessor’s instructions.
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</p>
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</dd>
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<dt><code>-mivc2</code></dt>
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<dd><a name="index-mivc2"></a>
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<p>Enables IVC2 scheduling. IVC2 is a 64-bit VLIW coprocessor.
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</p>
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</dd>
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<dt><code>-mdc</code></dt>
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<dd><a name="index-mdc"></a>
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<p>Causes constant variables to be placed in the <code>.near</code> section.
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</p>
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</dd>
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<dt><code>-mdiv</code></dt>
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<dd><a name="index-mdiv-2"></a>
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<p>Enables the <code>div</code> and <code>divu</code> instructions.
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</p>
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</dd>
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<dt><code>-meb</code></dt>
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<dd><a name="index-meb"></a>
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<p>Generate big-endian code.
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</p>
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</dd>
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<dt><code>-mel</code></dt>
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<dd><a name="index-mel"></a>
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<p>Generate little-endian code.
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</p>
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</dd>
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<dt><code>-mio-volatile</code></dt>
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<dd><a name="index-mio_002dvolatile"></a>
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<p>Tells the compiler that any variable marked with the <code>io</code>
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attribute is to be considered volatile.
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</p>
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</dd>
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<dt><code>-ml</code></dt>
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<dd><a name="index-ml"></a>
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<p>Causes variables to be assigned to the <code>.far</code> section by default.
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</p>
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</dd>
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<dt><code>-mleadz</code></dt>
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<dd><a name="index-mleadz"></a>
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<p>Enables the <code>leadz</code> (leading zero) instruction.
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</p>
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</dd>
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<dt><code>-mm</code></dt>
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<dd><a name="index-mm"></a>
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<p>Causes variables to be assigned to the <code>.near</code> section by default.
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</p>
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</dd>
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<dt><code>-mminmax</code></dt>
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<dd><a name="index-mminmax"></a>
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<p>Enables the <code>min</code> and <code>max</code> instructions.
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</p>
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</dd>
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<dt><code>-mmult</code></dt>
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<dd><a name="index-mmult"></a>
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<p>Enables the multiplication and multiply-accumulate instructions.
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</p>
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</dd>
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<dt><code>-mno-opts</code></dt>
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<dd><a name="index-mno_002dopts"></a>
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<p>Disables all the optional instructions enabled by <samp>-mall-opts</samp>.
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</p>
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</dd>
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<dt><code>-mrepeat</code></dt>
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<dd><a name="index-mrepeat"></a>
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<p>Enables the <code>repeat</code> and <code>erepeat</code> instructions, used for
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low-overhead looping.
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</p>
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</dd>
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<dt><code>-ms</code></dt>
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<dd><a name="index-ms-1"></a>
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<p>Causes all variables to default to the <code>.tiny</code> section. Note
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that there is a 65536-byte limit to this section. Accesses to these
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variables use the <code>%gp</code> base register.
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</p>
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</dd>
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<dt><code>-msatur</code></dt>
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<dd><a name="index-msatur"></a>
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<p>Enables the saturation instructions. Note that the compiler does not
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currently generate these itself, but this option is included for
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compatibility with other tools, like <code>as</code>.
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</p>
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</dd>
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<dt><code>-msdram</code></dt>
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<dd><a name="index-msdram-1"></a>
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<p>Link the SDRAM-based runtime instead of the default ROM-based runtime.
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</p>
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</dd>
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<dt><code>-msim</code></dt>
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<dd><a name="index-msim-5"></a>
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<p>Link the simulator run-time libraries.
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</p>
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</dd>
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<dt><code>-msimnovec</code></dt>
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<dd><a name="index-msimnovec"></a>
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<p>Link the simulator runtime libraries, excluding built-in support
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for reset and exception vectors and tables.
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</p>
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</dd>
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<dt><code>-mtf</code></dt>
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<dd><a name="index-mtf"></a>
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<p>Causes all functions to default to the <code>.far</code> section. Without
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this option, functions default to the <code>.near</code> section.
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</p>
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</dd>
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<dt><code>-mtiny=<var>n</var></code></dt>
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<dd><a name="index-mtiny_003d"></a>
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<p>Variables that are <var>n</var> bytes or smaller are allocated to the
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<code>.tiny</code> section. These variables use the <code>$gp</code> base
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register. The default for this option is 4, but note that there’s a
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65536-byte limit to the <code>.tiny</code> section.
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</p>
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</dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="MicroBlaze-Options.html#MicroBlaze-Options" accesskey="n" rel="next">MicroBlaze Options</a>, Previous: <a href="MCore-Options.html#MCore-Options" accesskey="p" rel="prev">MCore Options</a>, Up: <a href="Submodel-Options.html#Submodel-Options" accesskey="u" rel="up">Submodel Options</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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