shithub: rgbds

ref: a18b65de21e56b6aa5120d09a3b613f5b9226ead
dir: /doc/asm/rept.htm/

View raw version
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
	<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
	<title>xAsm REPT, ENDR</title>
        <link rel="stylesheet" type="text/css" href="../style.css">
</head>
<body>
<h1>REPT, ENDR</h1>
<p>Suppose you’re feeling lazy and you want to unroll a time consuming loop. <dfn>REPT</dfn> is here for that purpose. Everything between REPT and ENDR will be repeated a number of times just as if you done a copy/paste operation yourself</p>
<pre>REPT 4
add  a,c
ENDR</pre>
<p>This will assemble <code>add a,c</code> four times.</p>
<p>You can also use REPT to generate tables on the fly:</p>
<pre>; --
; -- Generate a 256 byte sine table with values between 0 and 128
; --
ANGLE   SET     0.0
        REPT    256
        DB      (MUL(64.0,SIN(ANGLE))+64.0)>>16
ANGLE   SET     ANGLE+256.0
        ENDR</pre>
<p>REPT is also very useful in recursive macros and as in macros you can also use the special label operator \@. REPT-blocks can be nested.<p>
<h1>See also:</h1>
<ul>
<li><a href="macro.htm#labelsuffix">\@</a>
</ul>
<hr>
<p>Last updated 21 June 1997 by <a href="mailto:[email protected]">Carsten Sorensen</a></p>
</body>
</html>