📄 expressions.html
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<HTML>
<HEAD>
<TITLE>Mappy VM Help - Expressions</TITLE>
<META NAME="Author" CONTENT="Michael Noland">
<META NAME="Copyright" CONTENT="(C) 2001-2003 Bottled Light, Inc.">
</HEAD>
<BODY>
<P>
<H1>Expressions</H1>
</P>
<HR><!------------------------------------------------------------------------->
<ul>
<li>The expression parser understands both integer and hexadecimal literals, which
can be specified using either <code>0x</code> or <code>$</code> as a prefix.</li>
<li>The CPU registers are pre-defined and available in expressions as r0-r15.</li>
<li>A memory access can be performed using the syntax:<pre>
[expression]:size where size is one of 8,16,32
</pre>
For instance, [$04000000]:16 returns the halfword at $04000000.
</li>
</ul>
<h3>The operators are, in order of precedence:</h3>
<p>
Multiplication Operations:
<code>
<ul>
<li> * performs integer multiplication </li>
<li> / performs integer division </li>
<li> & performs bitwise and </li>
<li> % performs modulo division </li>
</ul>
</code>
</p>
<p>
Addition Operations:
<code>
<ul>
<li> + performs integer addition </li>
<li> - performs integer subtraction </li>
<li> | performs bitwise inclusive-or </li>
<li> ^ performs bitwise exclusive-or </li>
</ul>
</code>
</p>
<p>
Relational Operations:
<code>
<ul>
<li> < less than </li>
<li> <= less than or equal to </li>
<li> > greater than </li>
<li> >= greater than or equal to </li>
<li> <> not equal to </li>
<li> ! boolean not </li>
</ul>
</code>
</p>
<HR><!------------------------------------------------------------------------->
<P ALIGN="center">Copyright © 2001 to 2003, Bottled Light, Inc.</P>
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