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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 ‘<samp><span class="samp">.data</span></samp>’, ‘<samp><span class="samp">bss</span></samp>’, or ‘<samp><span class="samp">.rodata</span></samp>’ (unless the |
| <code>section</code> attribute has been specified). |
| This is the default. |
| |
| <p>The small data area consists of sections ‘<samp><span class="samp">.sdata</span></samp>’ and ‘<samp><span class="samp">.sbss</span></samp>’. |
| 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 ‘<samp><span class="samp">sdata</span></samp>’ or ‘<samp><span class="samp">use</span></samp>’ |
| 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—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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