[% setvar title Unrolling loops and tail recursion %]
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<a name='TITLE'></a><h1>TITLE</h1>
<p>Unrolling loops and tail recursion</p>
<a name='VERSION'></a><h1>VERSION</h1>
<pre>  Maintainer: Simon Cozens &lt;<a href='mailto:simon@brecon.co.uk'>simon@brecon.co.uk</a>&gt;
  Date: 25 Sep 2000
  Mailing List: <a href='mailto:perl6-internals@perl.org'>perl6-internals@perl.org</a>
  Number: 302
  Version: 1
  Status: Developing</pre>
<a name='ABSTRACT'></a><h1>ABSTRACT</h1>
<p>Implement loop unrolling and tail recursion elimination as optional
optimisations.</p>
<a name='DESCRIPTION'></a><h1>DESCRIPTION</h1>
<p>Tail recursion elimination is something which has been on the todo for a
long time, but I think nobody's done it because it's really really hard.
I'd suggest</p>
<pre>    use optimize 'recursion';</pre>
<p>would be a natural syntax, if <code>less</code> turns into <code>optimize</code>.</p>
<p>Unrolling of loops is something that becomes important for compiling to
standalone executables; I think</p>
<pre>    use optimize 'unroll-loops';</pre>
<p>would be the way to signify that. If we have a standalone compiler, I'd
suggest the cc-style <code>-f...</code> command-line options.</p>
<a name='IMPLEMENTATION'></a><h1>IMPLEMENTATION</h1>
<p>I have no idea how to implement tail recursion elimination, and I'd
dearly love to learn. Unrolling loops with constant indices shouldn't be
too hard.</p>
<a name='REFERENCES'></a><h1>REFERENCES</h1>
<p>RFC 303: Keep <code>use less</code>, but make it work.</p>
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