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| <h4 class="subsection">3.17.39 V850 Options</h4> |
| |
| <p><a name="index-V850-Options-2043"></a> |
| These ‘<samp><span class="samp">-m</span></samp>’ options are defined for V850 implementations: |
| |
| <dl> |
| <dt><code>-mlong-calls</code><dt><code>-mno-long-calls</code><dd><a name="index-mlong_002dcalls-2044"></a><a name="index-mno_002dlong_002dcalls-2045"></a>Treat all calls as being far away (near). If calls are assumed to be |
| far away, the compiler will always load the functions address up into a |
| register, and call indirect through the pointer. |
| |
| <br><dt><code>-mno-ep</code><dt><code>-mep</code><dd><a name="index-mno_002dep-2046"></a><a name="index-mep-2047"></a>Do not optimize (do optimize) basic blocks that use the same index |
| pointer 4 or more times to copy pointer into the <code>ep</code> register, and |
| use the shorter <code>sld</code> and <code>sst</code> instructions. The <samp><span class="option">-mep</span></samp> |
| option is on by default if you optimize. |
| |
| <br><dt><code>-mno-prolog-function</code><dt><code>-mprolog-function</code><dd><a name="index-mno_002dprolog_002dfunction-2048"></a><a name="index-mprolog_002dfunction-2049"></a>Do not use (do use) external functions to save and restore registers |
| at the prologue and epilogue of a function. The external functions |
| are slower, but use less code space if more than one function saves |
| the same number of registers. The <samp><span class="option">-mprolog-function</span></samp> option |
| is on by default if you optimize. |
| |
| <br><dt><code>-mspace</code><dd><a name="index-mspace-2050"></a>Try to make the code as small as possible. At present, this just turns |
| on the <samp><span class="option">-mep</span></samp> and <samp><span class="option">-mprolog-function</span></samp> options. |
| |
| <br><dt><code>-mtda=</code><var>n</var><dd><a name="index-mtda-2051"></a>Put static or global variables whose size is <var>n</var> bytes or less into |
| the tiny data area that register <code>ep</code> points to. The tiny data |
| area can hold up to 256 bytes in total (128 bytes for byte references). |
| |
| <br><dt><code>-msda=</code><var>n</var><dd><a name="index-msda-2052"></a>Put static or global variables whose size is <var>n</var> bytes or less into |
| the small data area that register <code>gp</code> points to. The small data |
| area can hold up to 64 kilobytes. |
| |
| <br><dt><code>-mzda=</code><var>n</var><dd><a name="index-mzda-2053"></a>Put static or global variables whose size is <var>n</var> bytes or less into |
| the first 32 kilobytes of memory. |
| |
| <br><dt><code>-mv850</code><dd><a name="index-mv850-2054"></a>Specify that the target processor is the V850. |
| |
| <br><dt><code>-mbig-switch</code><dd><a name="index-mbig_002dswitch-2055"></a>Generate code suitable for big switch tables. Use this option only if |
| the assembler/linker complain about out of range branches within a switch |
| table. |
| |
| <br><dt><code>-mapp-regs</code><dd><a name="index-mapp_002dregs-2056"></a>This option will cause r2 and r5 to be used in the code generated by |
| the compiler. This setting is the default. |
| |
| <br><dt><code>-mno-app-regs</code><dd><a name="index-mno_002dapp_002dregs-2057"></a>This option will cause r2 and r5 to be treated as fixed registers. |
| |
| <br><dt><code>-mv850e1</code><dd><a name="index-mv850e1-2058"></a>Specify that the target processor is the V850E1. The preprocessor |
| constants ‘<samp><span class="samp">__v850e1__</span></samp>’ and ‘<samp><span class="samp">__v850e__</span></samp>’ will be defined if |
| this option is used. |
| |
| <br><dt><code>-mv850e</code><dd><a name="index-mv850e-2059"></a>Specify that the target processor is the V850E. The preprocessor |
| constant ‘<samp><span class="samp">__v850e__</span></samp>’ will be defined if this option is used. |
| |
| <p>If neither <samp><span class="option">-mv850</span></samp> nor <samp><span class="option">-mv850e</span></samp> nor <samp><span class="option">-mv850e1</span></samp> |
| are defined then a default target processor will be chosen and the |
| relevant ‘<samp><span class="samp">__v850*__</span></samp>’ preprocessor constant will be defined. |
| |
| <p>The preprocessor constants ‘<samp><span class="samp">__v850</span></samp>’ and ‘<samp><span class="samp">__v851__</span></samp>’ are always |
| defined, regardless of which processor variant is the target. |
| |
| <br><dt><code>-mdisable-callt</code><dd><a name="index-mdisable_002dcallt-2060"></a>This option will suppress generation of the CALLT instruction for the |
| v850e and v850e1 flavors of the v850 architecture. The default is |
| <samp><span class="option">-mno-disable-callt</span></samp> which allows the CALLT instruction to be used. |
| |
| </dl> |
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