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<h4 class="section">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><code>;</code> is the line comment character.



   <p><code>!</code> can be used instead of a newline to separate statements.



   <p>Since <code>$</code> has no special meaning, you may use it in symbol names.



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