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<h4 class="subsection">3.17.20 M32R/D Options</h4>

<p><a name="index-M32R_002fD-options-1433"></a>
These <samp><span class="option">-m</span></samp> options are defined for Renesas M32R/D architectures:

     <dl>
<dt><code>-m32r2</code><dd><a name="index-m32r2-1434"></a>Generate code for the M32R/2.

     <br><dt><code>-m32rx</code><dd><a name="index-m32rx-1435"></a>Generate code for the M32R/X.

     <br><dt><code>-m32r</code><dd><a name="index-m32r-1436"></a>Generate code for the M32R.  This is the default.

     <br><dt><code>-mmodel=small</code><dd><a name="index-mmodel_003dsmall-1437"></a>Assume all objects live in the lower 16MB of memory (so that their addresses
can be loaded with the <code>ld24</code> instruction), and assume all subroutines
are reachable with the <code>bl</code> instruction. 
This is the default.

     <p>The addressability of a particular object can be set with the
<code>model</code> attribute.

     <br><dt><code>-mmodel=medium</code><dd><a name="index-mmodel_003dmedium-1438"></a>Assume objects may be anywhere in the 32-bit address space (the compiler
will generate <code>seth/add3</code> instructions to load their addresses), and
assume all subroutines are reachable with the <code>bl</code> instruction.

     <br><dt><code>-mmodel=large</code><dd><a name="index-mmodel_003dlarge-1439"></a>Assume objects may be anywhere in the 32-bit address space (the compiler
will generate <code>seth/add3</code> instructions to load their addresses), and
assume subroutines may not be reachable with the <code>bl</code> instruction
(the compiler will generate the much slower <code>seth/add3/jl</code>
instruction sequence).

     <br><dt><code>-msdata=none</code><dd><a name="index-msdata_003dnone-1440"></a>Disable use of the small data area.  Variables will be put into
one of &lsquo;<samp><span class="samp">.data</span></samp>&rsquo;, &lsquo;<samp><span class="samp">bss</span></samp>&rsquo;, or &lsquo;<samp><span class="samp">.rodata</span></samp>&rsquo; (unless the
<code>section</code> attribute has been specified). 
This is the default.

     <p>The small data area consists of sections &lsquo;<samp><span class="samp">.sdata</span></samp>&rsquo; and &lsquo;<samp><span class="samp">.sbss</span></samp>&rsquo;. 
Objects may be explicitly put in the small data area with the
<code>section</code> attribute using one of these sections.

     <br><dt><code>-msdata=sdata</code><dd><a name="index-msdata_003dsdata-1441"></a>Put small global and static data in the small data area, but do not
generate special code to reference them.

     <br><dt><code>-msdata=use</code><dd><a name="index-msdata_003duse-1442"></a>Put small global and static data in the small data area, and generate
special instructions to reference them.

     <br><dt><code>-G </code><var>num</var><dd><a name="index-G-1443"></a><a name="index-smaller-data-references-1444"></a>Put global and static objects less than or equal to <var>num</var> bytes
into the small data or bss sections instead of the normal data or bss
sections.  The default value of <var>num</var> is 8. 
The <samp><span class="option">-msdata</span></samp> option must be set to one of &lsquo;<samp><span class="samp">sdata</span></samp>&rsquo; or &lsquo;<samp><span class="samp">use</span></samp>&rsquo;
for this option to have any effect.

     <p>All modules should be compiled with the same <samp><span class="option">-G </span><var>num</var></samp> value. 
Compiling with different values of <var>num</var> may or may not work; if it
doesn't the linker will give an error message&mdash;incorrect code will not be
generated.

     <br><dt><code>-mdebug</code><dd><a name="index-mdebug-1445"></a>Makes the M32R specific code in the compiler display some statistics
that might help in debugging programs.

     <br><dt><code>-malign-loops</code><dd><a name="index-malign_002dloops-1446"></a>Align all loops to a 32-byte boundary.

     <br><dt><code>-mno-align-loops</code><dd><a name="index-mno_002dalign_002dloops-1447"></a>Do not enforce a 32-byte alignment for loops.  This is the default.

     <br><dt><code>-missue-rate=</code><var>number</var><dd><a name="index-missue_002drate_003d_0040var_007bnumber_007d-1448"></a>Issue <var>number</var> instructions per cycle.  <var>number</var> can only be 1
or 2.

     <br><dt><code>-mbranch-cost=</code><var>number</var><dd><a name="index-mbranch_002dcost_003d_0040var_007bnumber_007d-1449"></a><var>number</var> can only be 1 or 2.  If it is 1 then branches will be
preferred over conditional code, if it is 2, then the opposite will
apply.

     <br><dt><code>-mflush-trap=</code><var>number</var><dd><a name="index-mflush_002dtrap_003d_0040var_007bnumber_007d-1450"></a>Specifies the trap number to use to flush the cache.  The default is
12.  Valid numbers are between 0 and 15 inclusive.

     <br><dt><code>-mno-flush-trap</code><dd><a name="index-mno_002dflush_002dtrap-1451"></a>Specifies that the cache cannot be flushed by using a trap.

     <br><dt><code>-mflush-func=</code><var>name</var><dd><a name="index-mflush_002dfunc_003d_0040var_007bname_007d-1452"></a>Specifies the name of the operating system function to call to flush
the cache.  The default is <em>_flush_cache</em>, but a function call
will only be used if a trap is not available.

     <br><dt><code>-mno-flush-func</code><dd><a name="index-mno_002dflush_002dfunc-1453"></a>Indicates that there is no OS function for flushing the cache.

 </dl>

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