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<h4 class="subsection">3.17.23 MeP Options</h4>
<p><a name="index-MeP-options-1878"></a>
<dl>
<dt><code>-mabsdiff</code><dd><a name="index-mabsdiff-1879"></a>Enables the <code>abs</code> instruction, which is the absolute difference
between two registers.
<br><dt><code>-mall-opts</code><dd><a name="index-mall_002dopts-1880"></a>Enables all the optional instructions—average, multiply, divide, bit
operations, leading zero, absolute difference, min/max, clip, and
saturation.
<br><dt><code>-maverage</code><dd><a name="index-maverage-1881"></a>Enables the <code>ave</code> instruction, which computes the average of two
registers.
<br><dt><code>-mbased=</code><var>n</var><dd><a name="index-mbased_003d-1882"></a>Variables of size <var>n</var> bytes or smaller are placed in the
<code>.based</code> section by default. Based variables use the <code>$tp</code>
register as a base register, and there is a 128-byte limit to the
<code>.based</code> section.
<br><dt><code>-mbitops</code><dd><a name="index-mbitops-1883"></a>Enables the bit operation instructions—bit test (<code>btstm</code>), set
(<code>bsetm</code>), clear (<code>bclrm</code>), invert (<code>bnotm</code>), and
test-and-set (<code>tas</code>).
<br><dt><code>-mc=</code><var>name</var><dd><a name="index-mc_003d-1884"></a>Selects which section constant data is placed in. <var>name</var> may
be ‘<samp><span class="samp">tiny</span></samp>’, ‘<samp><span class="samp">near</span></samp>’, or ‘<samp><span class="samp">far</span></samp>’.
<br><dt><code>-mclip</code><dd><a name="index-mclip-1885"></a>Enables the <code>clip</code> instruction. Note that <samp><span class="option">-mclip</span></samp> is not
useful unless you also provide <samp><span class="option">-mminmax</span></samp>.
<br><dt><code>-mconfig=</code><var>name</var><dd><a name="index-mconfig_003d-1886"></a>Selects one of the built-in core configurations. Each MeP chip has
one or more modules in it; each module has a core CPU and a variety of
coprocessors, optional instructions, and peripherals. The
<code>MeP-Integrator</code> tool, not part of GCC, provides these
configurations through this option; using this option is the same as
using all the corresponding command-line options. The default
configuration is ‘<samp><span class="samp">default</span></samp>’.
<br><dt><code>-mcop</code><dd><a name="index-mcop-1887"></a>Enables the coprocessor instructions. By default, this is a 32-bit
coprocessor. Note that the coprocessor is normally enabled via the
<samp><span class="option">-mconfig=</span></samp> option.
<br><dt><code>-mcop32</code><dd><a name="index-mcop32-1888"></a>Enables the 32-bit coprocessor's instructions.
<br><dt><code>-mcop64</code><dd><a name="index-mcop64-1889"></a>Enables the 64-bit coprocessor's instructions.
<br><dt><code>-mivc2</code><dd><a name="index-mivc2-1890"></a>Enables IVC2 scheduling. IVC2 is a 64-bit VLIW coprocessor.
<br><dt><code>-mdc</code><dd><a name="index-mdc-1891"></a>Causes constant variables to be placed in the <code>.near</code> section.
<br><dt><code>-mdiv</code><dd><a name="index-mdiv-1892"></a>Enables the <code>div</code> and <code>divu</code> instructions.
<br><dt><code>-meb</code><dd><a name="index-meb-1893"></a>Generate big-endian code.
<br><dt><code>-mel</code><dd><a name="index-mel-1894"></a>Generate little-endian code.
<br><dt><code>-mio-volatile</code><dd><a name="index-mio_002dvolatile-1895"></a>Tells the compiler that any variable marked with the <code>io</code>
attribute is to be considered volatile.
<br><dt><code>-ml</code><dd><a name="index-ml-1896"></a>Causes variables to be assigned to the <code>.far</code> section by default.
<br><dt><code>-mleadz</code><dd><a name="index-mleadz-1897"></a>Enables the <code>leadz</code> (leading zero) instruction.
<br><dt><code>-mm</code><dd><a name="index-mm-1898"></a>Causes variables to be assigned to the <code>.near</code> section by default.
<br><dt><code>-mminmax</code><dd><a name="index-mminmax-1899"></a>Enables the <code>min</code> and <code>max</code> instructions.
<br><dt><code>-mmult</code><dd><a name="index-mmult-1900"></a>Enables the multiplication and multiply-accumulate instructions.
<br><dt><code>-mno-opts</code><dd><a name="index-mno_002dopts-1901"></a>Disables all the optional instructions enabled by <samp><span class="option">-mall-opts</span></samp>.
<br><dt><code>-mrepeat</code><dd><a name="index-mrepeat-1902"></a>Enables the <code>repeat</code> and <code>erepeat</code> instructions, used for
low-overhead looping.
<br><dt><code>-ms</code><dd><a name="index-ms-1903"></a>Causes all variables to default to the <code>.tiny</code> section. Note
that there is a 65536-byte limit to this section. Accesses to these
variables use the <code>%gp</code> base register.
<br><dt><code>-msatur</code><dd><a name="index-msatur-1904"></a>Enables the saturation instructions. Note that the compiler does not
currently generate these itself, but this option is included for
compatibility with other tools, like <code>as</code>.
<br><dt><code>-msdram</code><dd><a name="index-msdram-1905"></a>Link the SDRAM-based runtime instead of the default ROM-based runtime.
<br><dt><code>-msim</code><dd><a name="index-msim-1906"></a>Link the simulator run-time libraries.
<br><dt><code>-msimnovec</code><dd><a name="index-msimnovec-1907"></a>Link the simulator runtime libraries, excluding built-in support
for reset and exception vectors and tables.
<br><dt><code>-mtf</code><dd><a name="index-mtf-1908"></a>Causes all functions to default to the <code>.far</code> section. Without
this option, functions default to the <code>.near</code> section.
<br><dt><code>-mtiny=</code><var>n</var><dd><a name="index-mtiny_003d-1909"></a>Variables that are <var>n</var> bytes or smaller are allocated to the
<code>.tiny</code> section. These variables use the <code>$gp</code> base
register. The default for this option is 4, but note that there's a
65536-byte limit to the <code>.tiny</code> section.
</dl>
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