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132 lines
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<title>Comparison functions for poly_int (GNU Compiler Collection (GCC) Internals)</title>
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<a name="Comparison-functions-for-poly_005fint"></a>
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<p>
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Next: <a href="Properties-of-the-poly_005fint-comparisons.html#Properties-of-the-poly_005fint-comparisons" accesskey="n" rel="next">Properties of the <code>poly_int</code> comparisons</a>, Up: <a href="Comparisons-involving-poly_005fint.html#Comparisons-involving-poly_005fint" accesskey="u" rel="up">Comparisons involving <code>poly_int</code></a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="Comparison-functions-for-poly_005fint-1"></a>
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<h4 class="subsection">10.3.1 Comparison functions for <code>poly_int</code></h4>
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<p><code>poly_int</code> provides the following routines for checking whether
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a particular condition “may be” (might be) true:
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</p>
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<div class="example">
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<pre class="example">maybe_lt maybe_le maybe_eq maybe_ge maybe_gt
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maybe_ne
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</pre></div>
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<p>The functions have their natural meaning:
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</p>
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<dl compact="compact">
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<dt>‘<samp>maybe_lt(<var>a</var>, <var>b</var>)</samp>’</dt>
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<dd><p>Return true if <var>a</var> might be less than <var>b</var>.
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</p>
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</dd>
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<dt>‘<samp>maybe_le(<var>a</var>, <var>b</var>)</samp>’</dt>
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<dd><p>Return true if <var>a</var> might be less than or equal to <var>b</var>.
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</p>
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</dd>
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<dt>‘<samp>maybe_eq(<var>a</var>, <var>b</var>)</samp>’</dt>
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<dd><p>Return true if <var>a</var> might be equal to <var>b</var>.
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</p>
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</dd>
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<dt>‘<samp>maybe_ne(<var>a</var>, <var>b</var>)</samp>’</dt>
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<dd><p>Return true if <var>a</var> might not be equal to <var>b</var>.
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</p>
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</dd>
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<dt>‘<samp>maybe_ge(<var>a</var>, <var>b</var>)</samp>’</dt>
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<dd><p>Return true if <var>a</var> might be greater than or equal to <var>b</var>.
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</p>
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</dd>
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<dt>‘<samp>maybe_gt(<var>a</var>, <var>b</var>)</samp>’</dt>
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<dd><p>Return true if <var>a</var> might be greater than <var>b</var>.
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</p></dd>
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</dl>
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<p>For readability, <code>poly_int</code> also provides “known” inverses of these
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functions:
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</p>
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<div class="example">
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<pre class="example">known_lt (<var>a</var>, <var>b</var>) == !maybe_ge (<var>a</var>, <var>b</var>)
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known_le (<var>a</var>, <var>b</var>) == !maybe_gt (<var>a</var>, <var>b</var>)
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known_eq (<var>a</var>, <var>b</var>) == !maybe_ne (<var>a</var>, <var>b</var>)
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known_ge (<var>a</var>, <var>b</var>) == !maybe_lt (<var>a</var>, <var>b</var>)
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known_gt (<var>a</var>, <var>b</var>) == !maybe_le (<var>a</var>, <var>b</var>)
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known_ne (<var>a</var>, <var>b</var>) == !maybe_eq (<var>a</var>, <var>b</var>)
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</pre></div>
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