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| <h4 class="subsection">9.15.3 Syntax</h4> |
| |
| <p>The assembler syntax closely follows the HPPA instruction set |
| reference manual; assembler directives and general syntax closely follow the |
| HPPA assembly language reference manual, with a few noteworthy differences. |
| |
| <p>First, a colon may immediately follow a label definition. This is |
| simply for compatibility with how most assembly language programmers |
| write code. |
| |
| <p>Some obscure expression parsing problems may affect hand written code which |
| uses the <code>spop</code> instructions, or code which makes significant |
| use of the <code>!</code> line separator. |
| |
| <p><code>as</code> is much less forgiving about missing arguments and other |
| similar oversights than the HP assembler. <code>as</code> notifies you |
| of missing arguments as syntax errors; this is regarded as a feature, not a |
| bug. |
| |
| <p>Finally, <code>as</code> allows you to use an external symbol without |
| explicitly importing the symbol. <em>Warning:</em> in the future this will be |
| an error for HPPA targets. |
| |
| <p>Special characters for HPPA targets include: |
| |
| <p>‘<samp><span class="samp">;</span></samp>’ is the line comment character. |
| |
| <p>‘<samp><span class="samp">!</span></samp>’ can be used instead of a newline to separate statements. |
| |
| <p>Since ‘<samp><span class="samp">$</span></samp>’ has no special meaning, you may use it in symbol names. |
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