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<title>Using the GNU Compiler Collection (GCC): M32R/D Options</title>
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<a name="M32R_002fD-Options"></a>
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<div class="header">
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<p>
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Next: <a href="M680x0-Options.html#M680x0-Options" accesskey="n" rel="next">M680x0 Options</a>, Previous: <a href="M32C-Options.html#M32C-Options" accesskey="p" rel="prev">M32C 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="M32R_002fD-Options-1"></a>
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<h4 class="subsection">3.18.21 M32R/D Options</h4>
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<a name="index-M32R_002fD-options"></a>
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<p>These <samp>-m</samp> options are defined for Renesas M32R/D architectures:
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</p>
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<dl compact="compact">
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<dt><code>-m32r2</code></dt>
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<dd><a name="index-m32r2"></a>
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<p>Generate code for the M32R/2.
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</p>
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</dd>
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<dt><code>-m32rx</code></dt>
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<dd><a name="index-m32rx"></a>
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<p>Generate code for the M32R/X.
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</p>
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</dd>
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<dt><code>-m32r</code></dt>
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<dd><a name="index-m32r"></a>
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<p>Generate code for the M32R. This is the default.
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</p>
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</dd>
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<dt><code>-mmodel=small</code></dt>
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<dd><a name="index-mmodel_003dsmall"></a>
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<p>Assume all objects live in the lower 16MB of memory (so that their addresses
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can be loaded with the <code>ld24</code> instruction), and assume all subroutines
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are reachable with the <code>bl</code> instruction.
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This is the default.
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</p>
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<p>The addressability of a particular object can be set with the
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<code>model</code> attribute.
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</p>
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</dd>
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<dt><code>-mmodel=medium</code></dt>
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<dd><a name="index-mmodel_003dmedium"></a>
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<p>Assume objects may be anywhere in the 32-bit address space (the compiler
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generates <code>seth/add3</code> instructions to load their addresses), and
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assume all subroutines are reachable with the <code>bl</code> instruction.
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</p>
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</dd>
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<dt><code>-mmodel=large</code></dt>
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<dd><a name="index-mmodel_003dlarge"></a>
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<p>Assume objects may be anywhere in the 32-bit address space (the compiler
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generates <code>seth/add3</code> instructions to load their addresses), and
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assume subroutines may not be reachable with the <code>bl</code> instruction
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(the compiler generates the much slower <code>seth/add3/jl</code>
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instruction sequence).
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</p>
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</dd>
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<dt><code>-msdata=none</code></dt>
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<dd><a name="index-msdata_003dnone-1"></a>
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<p>Disable use of the small data area. Variables are put into
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one of <code>.data</code>, <code>.bss</code>, or <code>.rodata</code> (unless the
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<code>section</code> attribute has been specified).
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This is the default.
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</p>
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<p>The small data area consists of sections <code>.sdata</code> and <code>.sbss</code>.
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Objects may be explicitly put in the small data area with the
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<code>section</code> attribute using one of these sections.
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</p>
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</dd>
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<dt><code>-msdata=sdata</code></dt>
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<dd><a name="index-msdata_003dsdata"></a>
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<p>Put small global and static data in the small data area, but do not
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generate special code to reference them.
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</p>
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</dd>
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<dt><code>-msdata=use</code></dt>
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<dd><a name="index-msdata_003duse"></a>
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<p>Put small global and static data in the small data area, and generate
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special instructions to reference them.
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</p>
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</dd>
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<dt><code>-G <var>num</var></code></dt>
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<dd><a name="index-G"></a>
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<a name="index-smaller-data-references"></a>
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<p>Put global and static objects less than or equal to <var>num</var> bytes
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into the small data or BSS sections instead of the normal data or BSS
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sections. The default value of <var>num</var> is 8.
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The <samp>-msdata</samp> option must be set to one of ‘<samp>sdata</samp>’ or ‘<samp>use</samp>’
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for this option to have any effect.
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</p>
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<p>All modules should be compiled with the same <samp>-G <var>num</var></samp> value.
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Compiling with different values of <var>num</var> may or may not work; if it
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doesn’t the linker gives an error message—incorrect code is not
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generated.
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</p>
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</dd>
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<dt><code>-mdebug</code></dt>
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<dd><a name="index-mdebug"></a>
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<p>Makes the M32R-specific code in the compiler display some statistics
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that might help in debugging programs.
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</p>
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</dd>
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<dt><code>-malign-loops</code></dt>
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<dd><a name="index-malign_002dloops"></a>
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<p>Align all loops to a 32-byte boundary.
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</p>
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</dd>
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<dt><code>-mno-align-loops</code></dt>
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<dd><a name="index-mno_002dalign_002dloops"></a>
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<p>Do not enforce a 32-byte alignment for loops. This is the default.
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</p>
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</dd>
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<dt><code>-missue-rate=<var>number</var></code></dt>
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<dd><a name="index-missue_002drate_003dnumber"></a>
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<p>Issue <var>number</var> instructions per cycle. <var>number</var> can only be 1
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or 2.
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</p>
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</dd>
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<dt><code>-mbranch-cost=<var>number</var></code></dt>
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<dd><a name="index-mbranch_002dcost_003dnumber"></a>
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<p><var>number</var> can only be 1 or 2. If it is 1 then branches are
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preferred over conditional code, if it is 2, then the opposite applies.
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</p>
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</dd>
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<dt><code>-mflush-trap=<var>number</var></code></dt>
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<dd><a name="index-mflush_002dtrap_003dnumber"></a>
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<p>Specifies the trap number to use to flush the cache. The default is
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12. Valid numbers are between 0 and 15 inclusive.
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</p>
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</dd>
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<dt><code>-mno-flush-trap</code></dt>
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<dd><a name="index-mno_002dflush_002dtrap"></a>
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<p>Specifies that the cache cannot be flushed by using a trap.
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</p>
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</dd>
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<dt><code>-mflush-func=<var>name</var></code></dt>
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<dd><a name="index-mflush_002dfunc_003dname"></a>
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<p>Specifies the name of the operating system function to call to flush
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the cache. The default is ‘<samp>_flush_cache</samp>’, but a function call
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is only used if a trap is not available.
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</p>
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</dd>
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<dt><code>-mno-flush-func</code></dt>
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<dd><a name="index-mno_002dflush_002dfunc"></a>
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<p>Indicates that there is no OS function for flushing the cache.
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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="M680x0-Options.html#M680x0-Options" accesskey="n" rel="next">M680x0 Options</a>, Previous: <a href="M32C-Options.html#M32C-Options" accesskey="p" rel="prev">M32C 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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