Remove hint.html and index.html
As per discussions on GitHub the index.html and hint.html files should be deleted in favour of README.md files (from any .text/.txt/.markdown/.md files which will be turned into README.md in an upcoming commit).
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta name="GENERATOR" content="mkd2html 2.1.3 DL=DISCOUNT">
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<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=utf-8">
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<link rel="stylesheet"
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type="text/css"
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href="../hint.css">
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<title>Most surprisingly portable</title>
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</head>
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<body>
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<h1>Most surprisingly portable</h1>
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<p>Gregor Richards<br>
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<a href="mailto:Richards@codu.org">Richards@codu.org</a></p>
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<h2>Judges' comments:</h2>
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<h3>To build:</h3>
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<pre><code>make richards
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</code></pre>
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<h3>To run:</h3>
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<pre><code>./richards
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</code></pre>
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<h3>Try:</h3>
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<pre><code>echo '10 9 8 7 6 5 4 3 2 1*p*p*p*p*p*p*p*p*p' | ./richards
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</code></pre>
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<h3>Selected Judges Remarks:</h3>
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<p>Oh no, yet another dc-style calculator? (see 2000/dlowe using an embedded Perl
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interpreter and deemed Worst Abuse of the Rules).
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Well, this one does it (expression calculation, that is, not the rule abuse) in a different way.
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The author claims that his calculator does just-in-time compilation.
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What would you do to prove or disprove his claim without attempting to unravel the source?</p>
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<h2>Author’s comments:</h2>
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<p>This is an implementation of the classic UNIX dc command, the reverse-polish
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calculator. Actually it’s a pretty bad implementation, since it only implements
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32-bit integers (well, sizeof(int)-sized integers). It only implements the
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commands +, -, *, /, p (only for numbers), register stacks, macros and
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comparisons. Wow, you’d think I could’ve done better in 2K of code.</p>
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<p>OH! I forgot to mention! It’s a JIT.</p>
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<p>Wait, don’t stop reading! I know what you’re thinking, platform-specific code
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is discouraged in IOCCC. But do you see any platform-specific code? There’s no
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assembler here! This JIT works on a dozen platforms, and the only
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platform-specific assumptions it makes are that the stack grows down and
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integers are at least 32-bit.</p>
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<p>You will probably get warnings while compiling the code. In particular:</p>
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<ul>
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<li>If your system requires the inclusion of alloca.h to use alloca, use the
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compile flag -DAH</li>
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<li>If your system cannot use mmap, use the compile flag -DNM</li>
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<li>I don’t include any headers I don’t strictly need to, so you’ll get warnings
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about (at least) memcpy, isdigit, atoi, calloc, malloc and alloca if you
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didn’t use -DAH.</li>
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<li>GCC likes to complain about while (a = b) (assignments as a condition).</li>
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<li>I don’t return from main, even though it’s declared to return int.</li>
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</ul>
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<p>Platforms on which all known/tested optimization levels work with no additional
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flags:</p>
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<ul>
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<li>gcc 4.6.2 + x86[_64] + GNU/Linux, Mac OS X or Windows</li>
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<li>clang 2.9-16 + x86[_64] + GNU/Linux or Mac OS X</li>
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<li>tcc 0.9.25</li>
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<li>gcc 4.4.5 + alpha, arm, mips[el], powerpc[64], s390x (IBM zSeries)</li>
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<li>gcc 4.1.3 + vax + NetBSD</li>
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</ul>
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<p>Platforms which work but not at all optimization levels or needing special
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flags:</p>
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<ul>
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<li>owcc 1.9 + x86 + Windows: Needs -DNM -DAH -fno-stack-check</li>
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<li>gcc 4.4.5 + sh4: -O0 works, higher optimization levels don’t work for unknown reasons.</li>
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</ul>
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<hr />
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<TABLE><TR>
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<TD><a rel="license" href="http://creativecommons.org/licenses/by-sa/3.0/"><img alt="Creative Commons License" style="border-width:0" src="http://i.creativecommons.org/l/by-sa/3.0/88x31.png" /></a></TD>
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<TD><P>© Copyright 1984-2012,
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<A HREF="/judges.html">Leo Broukhis, Simon Cooper, Landon Curt Noll</A>
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- All rights reserved<BR>
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This work is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-sa/3.0/">Creative Commons Attribution-ShareAlike 3.0 Unported License</a>.</P></TD>
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<TD> <!--<a href="http://validator.w3.org/check?uri=referer"><img src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01 Transitional" height="31" width="88"></a>--></TD>
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</TR></TABLE>
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</body>
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</html>
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