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| <title>Using the GNU Compiler Collection (GCC): Paired-Single Arithmetic</title> |
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| <h4 class="subsubsection">6.57.16.1 Paired-Single Arithmetic</h4> |
| |
| <p>The table below lists the <code>v2sf</code> operations for which hardware |
| support exists. <code>a</code>, <code>b</code> and <code>c</code> are <code>v2sf</code> |
| values and <code>x</code> is an integral value. |
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| <table> |
| <tr><td width="50%">C code</td><td width="50%">MIPS instruction</td></tr> |
| <tr><td width="50%"><code>a + b</code></td><td width="50%"><code>add.ps</code></td></tr> |
| <tr><td width="50%"><code>a - b</code></td><td width="50%"><code>sub.ps</code></td></tr> |
| <tr><td width="50%"><code>-a</code></td><td width="50%"><code>neg.ps</code></td></tr> |
| <tr><td width="50%"><code>a * b</code></td><td width="50%"><code>mul.ps</code></td></tr> |
| <tr><td width="50%"><code>a * b + c</code></td><td width="50%"><code>madd.ps</code></td></tr> |
| <tr><td width="50%"><code>a * b - c</code></td><td width="50%"><code>msub.ps</code></td></tr> |
| <tr><td width="50%"><code>-(a * b + c)</code></td><td width="50%"><code>nmadd.ps</code></td></tr> |
| <tr><td width="50%"><code>-(a * b - c)</code></td><td width="50%"><code>nmsub.ps</code></td></tr> |
| <tr><td width="50%"><code>x ? a : b</code></td><td width="50%"><code>movn.ps</code>/<code>movz.ps</code></td></tr> |
| </table> |
| |
| <p>Note that the multiply-accumulate instructions can be disabled |
| using the command-line option <code>-mno-fused-madd</code>. |
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