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127 lines
6.0 KiB
HTML
127 lines
6.0 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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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>Division of poly_ints (GNU Compiler Collection (GCC) Internals)</title>
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<meta name="description" content="Division of poly_ints (GNU Compiler Collection (GCC) Internals)">
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<meta name="keywords" content="Division of poly_ints (GNU Compiler Collection (GCC) Internals)">
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<meta name="distribution" content="global">
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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="Other-poly_005fint-arithmetic.html#Other-poly_005fint-arithmetic" rel="next" title="Other poly_int arithmetic">
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<link href="wi-arithmetic-on-poly_005fints.html#wi-arithmetic-on-poly_005fints" rel="prev" title="wi arithmetic on 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="Division-of-poly_005fints"></a>
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<div class="header">
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<p>
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Next: <a href="Other-poly_005fint-arithmetic.html#Other-poly_005fint-arithmetic" accesskey="n" rel="next">Other <code>poly_int</code> arithmetic</a>, Previous: <a href="wi-arithmetic-on-poly_005fints.html#wi-arithmetic-on-poly_005fints" accesskey="p" rel="prev"><code>wi</code> arithmetic on <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="Division-of-poly_005fints-1"></a>
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<h4 class="subsection">10.4.3 Division of <code>poly_int</code>s</h4>
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<p>Division of <code>poly_int</code>s is possible for certain inputs. The functions
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for division return true if the operation is possible and in most cases
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return the results by pointer. The routines are:
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</p>
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<dl compact="compact">
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<dt>‘<samp>multiple_p (<var>a</var>, <var>b</var>)</samp>’</dt>
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<dt>‘<samp>multiple_p (<var>a</var>, <var>b</var>, &<var>quotient</var>)</samp>’</dt>
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<dd><p>Return true if <var>a</var> is an exact multiple of <var>b</var>, storing the result
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in <var>quotient</var> if so. There are overloads for various combinations
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of polynomial and constant <var>a</var>, <var>b</var> and <var>quotient</var>.
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</p>
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</dd>
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<dt>‘<samp>constant_multiple_p (<var>a</var>, <var>b</var>)</samp>’</dt>
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<dt>‘<samp>constant_multiple_p (<var>a</var>, <var>b</var>, &<var>quotient</var>)</samp>’</dt>
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<dd><p>Like <code>multiple_p</code>, but also test whether the multiple is a
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compile-time constant.
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</p>
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</dd>
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<dt>‘<samp>can_div_trunc_p (<var>a</var>, <var>b</var>, &<var>quotient</var>)</samp>’</dt>
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<dt>‘<samp>can_div_trunc_p (<var>a</var>, <var>b</var>, &<var>quotient</var>, &<var>remainder</var>)</samp>’</dt>
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<dd><p>Return true if we can calculate ‘<samp>trunc (<var>a</var> / <var>b</var>)</samp>’ at compile
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time, storing the result in <var>quotient</var> and <var>remainder</var> if so.
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</p>
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</dd>
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<dt>‘<samp>can_div_away_from_zero_p (<var>a</var>, <var>b</var>, &<var>quotient</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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rounding away from zero. Store the result in <var>quotient</var> if so.
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</p>
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<p>Note that this is true if and only if <code>can_div_trunc_p</code> is true.
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The only difference is in the rounding of the result.
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</p></dd>
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</dl>
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<p>There is also an asserting form of division:
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</p>
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<dl compact="compact">
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<dt>‘<samp>exact_div (<var>a</var>, <var>b</var>)</samp>’</dt>
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<dd><p>Assert that <var>a</var> is a multiple of <var>b</var> and return
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‘<samp><var>a</var> / <var>b</var></samp>’. The result is a <code>poly_int</code> if <var>a</var>
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is a <code>poly_int</code>.
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</p></dd>
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</dl>
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</body>
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</html>
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