aarch64-linux-gnu-4.9/share/doc/gcc/MeP-Options.html - toolchains/linux-x86/gcc - Git at Google

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 <body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
 <a name="MeP-Options"></a>
 <div class="header">
 <p>
 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> &nbsp; [<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>
 </div>
 <hr>
 <a name="MeP-Options-1"></a>
 <h4 class="subsection">3.17.25 MeP Options</h4>
 <a name="index-MeP-options"></a>

 <dl compact="compact">
 <dt><code>-mabsdiff</code></dt>
 <dd><a name="index-mabsdiff"></a>
 <p>Enables the <code>abs</code> instruction, which is the absolute difference
 between two registers.
 </p>
 </dd>
 <dt><code>-mall-opts</code></dt>
 <dd><a name="index-mall_002dopts"></a>
 <p>Enables all the optional instructions&mdash;average, multiply, divide, bit
 operations, leading zero, absolute difference, min/max, clip, and
 saturation.
 </p>

 </dd>
 <dt><code>-maverage</code></dt>
 <dd><a name="index-maverage"></a>
 <p>Enables the <code>ave</code> instruction, which computes the average of two
 registers.
 </p>
 </dd>
 <dt><code>-mbased=<var>n</var></code></dt>
 <dd><a name="index-mbased_003d"></a>
 <p>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.
 </p>
 </dd>
 <dt><code>-mbitops</code></dt>
 <dd><a name="index-mbitops"></a>
 <p>Enables the bit operation instructions&mdash;bit test (<code>btstm</code>), set
 (<code>bsetm</code>), clear (<code>bclrm</code>), invert (<code>bnotm</code>), and
 test-and-set (<code>tas</code>).
 </p>
 </dd>
 <dt><code>-mc=<var>name</var></code></dt>
 <dd><a name="index-mc_003d"></a>
 <p>Selects which section constant data is placed in.  <var>name</var> may
 be <code>tiny</code>, <code>near</code>, or <code>far</code>.
 </p>
 </dd>
 <dt><code>-mclip</code></dt>
 <dd><a name="index-mclip"></a>
 <p>Enables the <code>clip</code> instruction.  Note that <code>-mclip</code> is not
 useful unless you also provide <code>-mminmax</code>.
 </p>
 </dd>
 <dt><code>-mconfig=<var>name</var></code></dt>
 <dd><a name="index-mconfig_003d"></a>
 <p>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 <code>default</code>.
 </p>
 </dd>
 <dt><code>-mcop</code></dt>
 <dd><a name="index-mcop"></a>
 <p>Enables the coprocessor instructions.  By default, this is a 32-bit
 coprocessor.  Note that the coprocessor is normally enabled via the
 <code>-mconfig=</code> option.
 </p>
 </dd>
 <dt><code>-mcop32</code></dt>
 <dd><a name="index-mcop32"></a>
 <p>Enables the 32-bit coprocessor&rsquo;s instructions.
 </p>
 </dd>
 <dt><code>-mcop64</code></dt>
 <dd><a name="index-mcop64"></a>
 <p>Enables the 64-bit coprocessor&rsquo;s instructions.
 </p>
 </dd>
 <dt><code>-mivc2</code></dt>
 <dd><a name="index-mivc2"></a>
 <p>Enables IVC2 scheduling.  IVC2 is a 64-bit VLIW coprocessor.
 </p>
 </dd>
 <dt><code>-mdc</code></dt>
 <dd><a name="index-mdc"></a>
 <p>Causes constant variables to be placed in the <code>.near</code> section.
 </p>
 </dd>
 <dt><code>-mdiv</code></dt>
 <dd><a name="index-mdiv-2"></a>
 <p>Enables the <code>div</code> and <code>divu</code> instructions.
 </p>
 </dd>
 <dt><code>-meb</code></dt>
 <dd><a name="index-meb"></a>
 <p>Generate big-endian code.
 </p>
 </dd>
 <dt><code>-mel</code></dt>
 <dd><a name="index-mel"></a>
 <p>Generate little-endian code.
 </p>
 </dd>
 <dt><code>-mio-volatile</code></dt>
 <dd><a name="index-mio_002dvolatile"></a>
 <p>Tells the compiler that any variable marked with the <code>io</code>
 attribute is to be considered volatile.
 </p>
 </dd>
 <dt><code>-ml</code></dt>
 <dd><a name="index-ml"></a>
 <p>Causes variables to be assigned to the <code>.far</code> section by default.
 </p>
 </dd>
 <dt><code>-mleadz</code></dt>
 <dd><a name="index-mleadz"></a>
 <p>Enables the <code>leadz</code> (leading zero) instruction.
 </p>
 </dd>
 <dt><code>-mm</code></dt>
 <dd><a name="index-mm"></a>
 <p>Causes variables to be assigned to the <code>.near</code> section by default.
 </p>
 </dd>
 <dt><code>-mminmax</code></dt>
 <dd><a name="index-mminmax"></a>
 <p>Enables the <code>min</code> and <code>max</code> instructions.
 </p>
 </dd>
 <dt><code>-mmult</code></dt>
 <dd><a name="index-mmult"></a>
 <p>Enables the multiplication and multiply-accumulate instructions.
 </p>
 </dd>
 <dt><code>-mno-opts</code></dt>
 <dd><a name="index-mno_002dopts"></a>
 <p>Disables all the optional instructions enabled by <code>-mall-opts</code>.
 </p>
 </dd>
 <dt><code>-mrepeat</code></dt>
 <dd><a name="index-mrepeat"></a>
 <p>Enables the <code>repeat</code> and <code>erepeat</code> instructions, used for
 low-overhead looping.
 </p>
 </dd>
 <dt><code>-ms</code></dt>
 <dd><a name="index-ms-1"></a>
 <p>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.
 </p>
 </dd>
 <dt><code>-msatur</code></dt>
 <dd><a name="index-msatur"></a>
 <p>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>.
 </p>
 </dd>
 <dt><code>-msdram</code></dt>
 <dd><a name="index-msdram-1"></a>
 <p>Link the SDRAM-based runtime instead of the default ROM-based runtime.
 </p>
 </dd>
 <dt><code>-msim</code></dt>
 <dd><a name="index-msim-4"></a>
 <p>Link the simulator run-time libraries.
 </p>
 </dd>
 <dt><code>-msimnovec</code></dt>
 <dd><a name="index-msimnovec"></a>
 <p>Link the simulator runtime libraries, excluding built-in support
 for reset and exception vectors and tables.
 </p>
 </dd>
 <dt><code>-mtf</code></dt>
 <dd><a name="index-mtf"></a>
 <p>Causes all functions to default to the <code>.far</code> section.  Without
 this option, functions default to the <code>.near</code> section.
 </p>
 </dd>
 <dt><code>-mtiny=<var>n</var></code></dt>
 <dd><a name="index-mtiny_003d"></a>
 <p>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&rsquo;s a
 65536-byte limit to the <code>.tiny</code> section.
 </p>
 </dd>
 </dl>

 <hr>
 <div class="header">
 <p>
 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> &nbsp; [<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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	<a name="MeP-Options"></a>
	<div class="header">
	<p>
	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>
	</div>
	<hr>
	<a name="MeP-Options-1"></a>
	<h4 class="subsection">3.17.25 MeP Options</h4>
	<a name="index-MeP-options"></a>

	<dl compact="compact">
	<dt><code>-mabsdiff</code></dt>
	<dd><a name="index-mabsdiff"></a>
	<p>Enables the <code>abs</code> instruction, which is the absolute difference
	between two registers.
	</p>
	</dd>
	<dt><code>-mall-opts</code></dt>
	<dd><a name="index-mall_002dopts"></a>
	<p>Enables all the optional instructions—average, multiply, divide, bit
	operations, leading zero, absolute difference, min/max, clip, and
	saturation.
	</p>

	</dd>
	<dt><code>-maverage</code></dt>
	<dd><a name="index-maverage"></a>
	<p>Enables the <code>ave</code> instruction, which computes the average of two
	registers.
	</p>
	</dd>
	<dt><code>-mbased=<var>n</var></code></dt>
	<dd><a name="index-mbased_003d"></a>
	<p>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.
	</p>
	</dd>
	<dt><code>-mbitops</code></dt>
	<dd><a name="index-mbitops"></a>
	<p>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>).
	</p>
	</dd>
	<dt><code>-mc=<var>name</var></code></dt>
	<dd><a name="index-mc_003d"></a>
	<p>Selects which section constant data is placed in. <var>name</var> may
	be <code>tiny</code>, <code>near</code>, or <code>far</code>.
	</p>
	</dd>
	<dt><code>-mclip</code></dt>
	<dd><a name="index-mclip"></a>
	<p>Enables the <code>clip</code> instruction. Note that <code>-mclip</code> is not
	useful unless you also provide <code>-mminmax</code>.
	</p>
	</dd>
	<dt><code>-mconfig=<var>name</var></code></dt>
	<dd><a name="index-mconfig_003d"></a>
	<p>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 <code>default</code>.
	</p>
	</dd>
	<dt><code>-mcop</code></dt>
	<dd><a name="index-mcop"></a>
	<p>Enables the coprocessor instructions. By default, this is a 32-bit
	coprocessor. Note that the coprocessor is normally enabled via the
	<code>-mconfig=</code> option.
	</p>
	</dd>
	<dt><code>-mcop32</code></dt>
	<dd><a name="index-mcop32"></a>
	<p>Enables the 32-bit coprocessor’s instructions.
	</p>
	</dd>
	<dt><code>-mcop64</code></dt>
	<dd><a name="index-mcop64"></a>
	<p>Enables the 64-bit coprocessor’s instructions.
	</p>
	</dd>
	<dt><code>-mivc2</code></dt>
	<dd><a name="index-mivc2"></a>
	<p>Enables IVC2 scheduling. IVC2 is a 64-bit VLIW coprocessor.
	</p>
	</dd>
	<dt><code>-mdc</code></dt>
	<dd><a name="index-mdc"></a>
	<p>Causes constant variables to be placed in the <code>.near</code> section.
	</p>
	</dd>
	<dt><code>-mdiv</code></dt>
	<dd><a name="index-mdiv-2"></a>
	<p>Enables the <code>div</code> and <code>divu</code> instructions.
	</p>
	</dd>
	<dt><code>-meb</code></dt>
	<dd><a name="index-meb"></a>
	<p>Generate big-endian code.
	</p>
	</dd>
	<dt><code>-mel</code></dt>
	<dd><a name="index-mel"></a>
	<p>Generate little-endian code.
	</p>
	</dd>
	<dt><code>-mio-volatile</code></dt>
	<dd><a name="index-mio_002dvolatile"></a>
	<p>Tells the compiler that any variable marked with the <code>io</code>
	attribute is to be considered volatile.
	</p>
	</dd>
	<dt><code>-ml</code></dt>
	<dd><a name="index-ml"></a>
	<p>Causes variables to be assigned to the <code>.far</code> section by default.
	</p>
	</dd>
	<dt><code>-mleadz</code></dt>
	<dd><a name="index-mleadz"></a>
	<p>Enables the <code>leadz</code> (leading zero) instruction.
	</p>
	</dd>
	<dt><code>-mm</code></dt>
	<dd><a name="index-mm"></a>
	<p>Causes variables to be assigned to the <code>.near</code> section by default.
	</p>
	</dd>
	<dt><code>-mminmax</code></dt>
	<dd><a name="index-mminmax"></a>
	<p>Enables the <code>min</code> and <code>max</code> instructions.
	</p>
	</dd>
	<dt><code>-mmult</code></dt>
	<dd><a name="index-mmult"></a>
	<p>Enables the multiplication and multiply-accumulate instructions.
	</p>
	</dd>
	<dt><code>-mno-opts</code></dt>
	<dd><a name="index-mno_002dopts"></a>
	<p>Disables all the optional instructions enabled by <code>-mall-opts</code>.
	</p>
	</dd>
	<dt><code>-mrepeat</code></dt>
	<dd><a name="index-mrepeat"></a>
	<p>Enables the <code>repeat</code> and <code>erepeat</code> instructions, used for
	low-overhead looping.
	</p>
	</dd>
	<dt><code>-ms</code></dt>
	<dd><a name="index-ms-1"></a>
	<p>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.
	</p>
	</dd>
	<dt><code>-msatur</code></dt>
	<dd><a name="index-msatur"></a>
	<p>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>.
	</p>
	</dd>
	<dt><code>-msdram</code></dt>
	<dd><a name="index-msdram-1"></a>
	<p>Link the SDRAM-based runtime instead of the default ROM-based runtime.
	</p>
	</dd>
	<dt><code>-msim</code></dt>
	<dd><a name="index-msim-4"></a>
	<p>Link the simulator run-time libraries.
	</p>
	</dd>
	<dt><code>-msimnovec</code></dt>
	<dd><a name="index-msimnovec"></a>
	<p>Link the simulator runtime libraries, excluding built-in support
	for reset and exception vectors and tables.
	</p>
	</dd>
	<dt><code>-mtf</code></dt>
	<dd><a name="index-mtf"></a>
	<p>Causes all functions to default to the <code>.far</code> section. Without
	this option, functions default to the <code>.near</code> section.
	</p>
	</dd>
	<dt><code>-mtiny=<var>n</var></code></dt>
	<dd><a name="index-mtiny_003d"></a>
	<p>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.
	</p>
	</dd>
	</dl>

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