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124 lines
5.4 KiB
HTML
124 lines
5.4 KiB
HTML
4 years ago
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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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<!-- Copyright (C) 1988-2018 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Other poly_int arithmetic (GNU Compiler Collection (GCC) Internals)</title>
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<meta name="description" content="Other poly_int arithmetic (GNU Compiler Collection (GCC) Internals)">
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<meta name="keywords" content="Other poly_int arithmetic (GNU Compiler Collection (GCC) Internals)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Arithmetic-on-poly_005fints.html#Arithmetic-on-poly_005fints" rel="up" title="Arithmetic on poly_ints">
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<link href="Alignment-of-poly_005fints.html#Alignment-of-poly_005fints" rel="next" title="Alignment of poly_ints">
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<link href="Division-of-poly_005fints.html#Division-of-poly_005fints" rel="prev" title="Division of poly_ints">
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</style>
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</head>
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<body lang="en">
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<a name="Other-poly_005fint-arithmetic"></a>
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<div class="header">
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<p>
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Previous: <a href="Division-of-poly_005fints.html#Division-of-poly_005fints" accesskey="p" rel="prev">Division of <code>poly_int</code>s</a>, Up: <a href="Arithmetic-on-poly_005fints.html#Arithmetic-on-poly_005fints" accesskey="u" rel="up">Arithmetic on <code>poly_int</code>s</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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</div>
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<hr>
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<a name="Other-poly_005fint-arithmetic-1"></a>
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<h4 class="subsection">10.4.4 Other <code>poly_int</code> arithmetic</h4>
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<p>There are tentative routines for other operations besides division:
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</p>
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<dl compact="compact">
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<dt>‘<samp>can_ior_p (<var>a</var>, <var>b</var>, &<var>result</var>)</samp>’</dt>
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<dd><p>Return true if we can calculate ‘<samp><var>a</var> | <var>b</var></samp>’ at compile time,
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storing the result in <var>result</var> if so.
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</p></dd>
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</dl>
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<p>Also, ANDs with a value ‘<samp>(1 << <var>y</var>) - 1</samp>’ or its inverse can be
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treated as alignment operations. See <a href="Alignment-of-poly_005fints.html#Alignment-of-poly_005fints">Alignment of <code>poly_int</code>s</a>.
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</p>
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<p>In addition, the following miscellaneous routines are available:
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</p>
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<dl compact="compact">
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<dt>‘<samp>coeff_gcd (<var>a</var>)</samp>’</dt>
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<dd><p>Return the greatest common divisor of all nonzero coefficients in
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<var>a</var>, or zero if <var>a</var> is known to be zero.
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</p>
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</dd>
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<dt>‘<samp>common_multiple (<var>a</var>, <var>b</var>)</samp>’</dt>
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<dd><p>Return a value that is a multiple of both <var>a</var> and <var>b</var>, where
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one value is a <code>poly_int</code> and the other is a scalar. The result
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will be the least common multiple for some indeterminate values but
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not necessarily for all.
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</p>
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</dd>
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<dt>‘<samp>force_common_multiple (<var>a</var>, <var>b</var>)</samp>’</dt>
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<dd><p>Return a value that is a multiple of both <code>poly_int</code> <var>a</var> and
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<code>poly_int</code> <var>b</var>, asserting that such a value exists. The
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result will be the least common multiple for some indeterminate values
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but not necessarily for all.
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</p>
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<p>When using this routine, please add a comment explaining why the
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assertion is known to hold.
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</p></dd>
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</dl>
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<p>Please add any other operations that you find to be useful.
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</p>
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</body>
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</html>
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