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| <h4 class="subsection">9.11.1 D10V Options</h4> |
| |
| <p><a name="index-options_002c-D10V-979"></a><a name="index-D10V-options-980"></a>The Mitsubishi D10V version of <code>as</code> has a few machine |
| dependent options. |
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| <dl> |
| <dt>‘<samp><span class="samp">-O</span></samp>’<dd>The D10V can often execute two sub-instructions in parallel. When this option |
| is used, <code>as</code> will attempt to optimize its output by detecting when |
| instructions can be executed in parallel. |
| <br><dt>‘<samp><span class="samp">--nowarnswap</span></samp>’<dd>To optimize execution performance, <code>as</code> will sometimes swap the |
| order of instructions. Normally this generates a warning. When this option |
| is used, no warning will be generated when instructions are swapped. |
| <br><dt>‘<samp><span class="samp">--gstabs-packing</span></samp>’<dt>‘<samp><span class="samp">--no-gstabs-packing</span></samp>’<dd><code>as</code> packs adjacent short instructions into a single packed |
| instruction. ‘<samp><span class="samp">--no-gstabs-packing</span></samp>’ turns instruction packing off if |
| ‘<samp><span class="samp">--gstabs</span></samp>’ is specified as well; ‘<samp><span class="samp">--gstabs-packing</span></samp>’ (the |
| default) turns instruction packing on even when ‘<samp><span class="samp">--gstabs</span></samp>’ is |
| specified. |
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