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| <a name="Argument-Types-1"></a> |
| <h4 class="subsubsection">6.57.11.1 Argument Types</h4> |
| |
| <p>The arguments to the built-in functions can be divided into three groups: |
| register numbers, compile-time constants and run-time values. In order |
| to make this classification clear at a glance, the arguments and return |
| values are given the following pseudo types: |
| </p> |
| <table> |
| <tr><td width="20%">Pseudo type</td><td width="30%">Real C type</td><td width="15%">Constant?</td><td width="35%">Description</td></tr> |
| <tr><td width="20%"><code>uh</code></td><td width="30%"><code>unsigned short</code></td><td width="15%">No</td><td width="35%">an unsigned halfword</td></tr> |
| <tr><td width="20%"><code>uw1</code></td><td width="30%"><code>unsigned int</code></td><td width="15%">No</td><td width="35%">an unsigned word</td></tr> |
| <tr><td width="20%"><code>sw1</code></td><td width="30%"><code>int</code></td><td width="15%">No</td><td width="35%">a signed word</td></tr> |
| <tr><td width="20%"><code>uw2</code></td><td width="30%"><code>unsigned long long</code></td><td width="15%">No</td><td width="35%">an unsigned doubleword</td></tr> |
| <tr><td width="20%"><code>sw2</code></td><td width="30%"><code>long long</code></td><td width="15%">No</td><td width="35%">a signed doubleword</td></tr> |
| <tr><td width="20%"><code>const</code></td><td width="30%"><code>int</code></td><td width="15%">Yes</td><td width="35%">an integer constant</td></tr> |
| <tr><td width="20%"><code>acc</code></td><td width="30%"><code>int</code></td><td width="15%">Yes</td><td width="35%">an ACC register number</td></tr> |
| <tr><td width="20%"><code>iacc</code></td><td width="30%"><code>int</code></td><td width="15%">Yes</td><td width="35%">an IACC register number</td></tr> |
| </table> |
| |
| <p>These pseudo types are not defined by GCC, they are simply a notational |
| convenience used in this manual. |
| </p> |
| <p>Arguments of type <code>uh</code>, <code>uw1</code>, <code>sw1</code>, <code>uw2</code> |
| and <code>sw2</code> are evaluated at run time. They correspond to |
| register operands in the underlying FR-V instructions. |
| </p> |
| <p><code>const</code> arguments represent immediate operands in the underlying |
| FR-V instructions. They must be compile-time constants. |
| </p> |
| <p><code>acc</code> arguments are evaluated at compile time and specify the number |
| of an accumulator register. For example, an <code>acc</code> argument of 2 |
| selects the ACC2 register. |
| </p> |
| <p><code>iacc</code> arguments are similar to <code>acc</code> arguments but specify the |
| number of an IACC register. See see <a href="Other-Built_002din-Functions.html#Other-Built_002din-Functions">Other Built-in Functions</a> |
| for more details. |
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