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393 lines
28 KiB
HTML
393 lines
28 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>Soft float library routines (GNU Compiler Collection (GCC) Internals)</title>
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<meta name="description" content="Soft float library routines (GNU Compiler Collection (GCC) Internals)">
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<meta name="keywords" content="Soft float library routines (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="Libgcc.html#Libgcc" rel="up" title="Libgcc">
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<link href="Decimal-float-library-routines.html#Decimal-float-library-routines" rel="next" title="Decimal float library routines">
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<link href="Integer-library-routines.html#Integer-library-routines" rel="prev" title="Integer library routines">
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<style type="text/css">
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a.summary-letter {text-decoration: none}
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div.display {margin-left: 3.2em}
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div.example {margin-left: 3.2em}
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kbd {font-style: oblique}
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pre.display {font-family: inherit}
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Soft-float-library-routines"></a>
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<div class="header">
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<p>
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Next: <a href="Decimal-float-library-routines.html#Decimal-float-library-routines" accesskey="n" rel="next">Decimal float library routines</a>, Previous: <a href="Integer-library-routines.html#Integer-library-routines" accesskey="p" rel="prev">Integer library routines</a>, Up: <a href="Libgcc.html#Libgcc" accesskey="u" rel="up">Libgcc</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="Routines-for-floating-point-emulation"></a>
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<h3 class="section">4.2 Routines for floating point emulation</h3>
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<a name="index-soft-float-library"></a>
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<a name="index-arithmetic-library"></a>
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<a name="index-math-library"></a>
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<a name="index-msoft_002dfloat"></a>
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<p>The software floating point library is used on machines which do not
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have hardware support for floating point. It is also used whenever
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<samp>-msoft-float</samp> is used to disable generation of floating point
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instructions. (Not all targets support this switch.)
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</p>
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<p>For compatibility with other compilers, the floating point emulation
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routines can be renamed with the <code>DECLARE_LIBRARY_RENAMES</code> macro
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(see <a href="Library-Calls.html#Library-Calls">Library Calls</a>). In this section, the default names are used.
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</p>
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<p>Presently the library does not support <code>XFmode</code>, which is used
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for <code>long double</code> on some architectures.
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</p>
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<a name="Arithmetic-functions-1"></a>
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<h4 class="subsection">4.2.1 Arithmetic functions</h4>
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<dl>
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<dt><a name="index-_005f_005faddsf3"></a>Runtime Function: <em>float</em> <strong>__addsf3</strong> <em>(float <var>a</var>, float <var>b</var>)</em></dt>
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<dt><a name="index-_005f_005fadddf3"></a>Runtime Function: <em>double</em> <strong>__adddf3</strong> <em>(double <var>a</var>, double <var>b</var>)</em></dt>
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<dt><a name="index-_005f_005faddtf3"></a>Runtime Function: <em>long double</em> <strong>__addtf3</strong> <em>(long double <var>a</var>, long double <var>b</var>)</em></dt>
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<dt><a name="index-_005f_005faddxf3"></a>Runtime Function: <em>long double</em> <strong>__addxf3</strong> <em>(long double <var>a</var>, long double <var>b</var>)</em></dt>
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<dd><p>These functions return the sum of <var>a</var> and <var>b</var>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005fsubsf3"></a>Runtime Function: <em>float</em> <strong>__subsf3</strong> <em>(float <var>a</var>, float <var>b</var>)</em></dt>
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<dt><a name="index-_005f_005fsubdf3"></a>Runtime Function: <em>double</em> <strong>__subdf3</strong> <em>(double <var>a</var>, double <var>b</var>)</em></dt>
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<dt><a name="index-_005f_005fsubtf3"></a>Runtime Function: <em>long double</em> <strong>__subtf3</strong> <em>(long double <var>a</var>, long double <var>b</var>)</em></dt>
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<dt><a name="index-_005f_005fsubxf3"></a>Runtime Function: <em>long double</em> <strong>__subxf3</strong> <em>(long double <var>a</var>, long double <var>b</var>)</em></dt>
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<dd><p>These functions return the difference between <var>b</var> and <var>a</var>;
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that is, <em><var>a</var> - <var>b</var></em><!-- /@w -->.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005fmulsf3"></a>Runtime Function: <em>float</em> <strong>__mulsf3</strong> <em>(float <var>a</var>, float <var>b</var>)</em></dt>
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<dt><a name="index-_005f_005fmuldf3"></a>Runtime Function: <em>double</em> <strong>__muldf3</strong> <em>(double <var>a</var>, double <var>b</var>)</em></dt>
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<dt><a name="index-_005f_005fmultf3"></a>Runtime Function: <em>long double</em> <strong>__multf3</strong> <em>(long double <var>a</var>, long double <var>b</var>)</em></dt>
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<dt><a name="index-_005f_005fmulxf3"></a>Runtime Function: <em>long double</em> <strong>__mulxf3</strong> <em>(long double <var>a</var>, long double <var>b</var>)</em></dt>
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<dd><p>These functions return the product of <var>a</var> and <var>b</var>.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005fdivsf3"></a>Runtime Function: <em>float</em> <strong>__divsf3</strong> <em>(float <var>a</var>, float <var>b</var>)</em></dt>
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<dt><a name="index-_005f_005fdivdf3"></a>Runtime Function: <em>double</em> <strong>__divdf3</strong> <em>(double <var>a</var>, double <var>b</var>)</em></dt>
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<dt><a name="index-_005f_005fdivtf3"></a>Runtime Function: <em>long double</em> <strong>__divtf3</strong> <em>(long double <var>a</var>, long double <var>b</var>)</em></dt>
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<dt><a name="index-_005f_005fdivxf3"></a>Runtime Function: <em>long double</em> <strong>__divxf3</strong> <em>(long double <var>a</var>, long double <var>b</var>)</em></dt>
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<dd><p>These functions return the quotient of <var>a</var> and <var>b</var>; that is,
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<em><var>a</var> / <var>b</var></em><!-- /@w -->.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005fnegsf2"></a>Runtime Function: <em>float</em> <strong>__negsf2</strong> <em>(float <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005fnegdf2"></a>Runtime Function: <em>double</em> <strong>__negdf2</strong> <em>(double <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005fnegtf2"></a>Runtime Function: <em>long double</em> <strong>__negtf2</strong> <em>(long double <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005fnegxf2"></a>Runtime Function: <em>long double</em> <strong>__negxf2</strong> <em>(long double <var>a</var>)</em></dt>
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<dd><p>These functions return the negation of <var>a</var>. They simply flip the
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sign bit, so they can produce negative zero and negative NaN.
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</p></dd></dl>
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<a name="Conversion-functions"></a>
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<h4 class="subsection">4.2.2 Conversion functions</h4>
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<dl>
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<dt><a name="index-_005f_005fextendsfdf2"></a>Runtime Function: <em>double</em> <strong>__extendsfdf2</strong> <em>(float <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005fextendsftf2"></a>Runtime Function: <em>long double</em> <strong>__extendsftf2</strong> <em>(float <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005fextendsfxf2"></a>Runtime Function: <em>long double</em> <strong>__extendsfxf2</strong> <em>(float <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005fextenddftf2"></a>Runtime Function: <em>long double</em> <strong>__extenddftf2</strong> <em>(double <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005fextenddfxf2"></a>Runtime Function: <em>long double</em> <strong>__extenddfxf2</strong> <em>(double <var>a</var>)</em></dt>
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<dd><p>These functions extend <var>a</var> to the wider mode of their return
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type.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005ftruncxfdf2"></a>Runtime Function: <em>double</em> <strong>__truncxfdf2</strong> <em>(long double <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005ftrunctfdf2"></a>Runtime Function: <em>double</em> <strong>__trunctfdf2</strong> <em>(long double <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005ftruncxfsf2"></a>Runtime Function: <em>float</em> <strong>__truncxfsf2</strong> <em>(long double <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005ftrunctfsf2"></a>Runtime Function: <em>float</em> <strong>__trunctfsf2</strong> <em>(long double <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005ftruncdfsf2"></a>Runtime Function: <em>float</em> <strong>__truncdfsf2</strong> <em>(double <var>a</var>)</em></dt>
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<dd><p>These functions truncate <var>a</var> to the narrower mode of their return
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type, rounding toward zero.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005ffixsfsi"></a>Runtime Function: <em>int</em> <strong>__fixsfsi</strong> <em>(float <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005ffixdfsi"></a>Runtime Function: <em>int</em> <strong>__fixdfsi</strong> <em>(double <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005ffixtfsi"></a>Runtime Function: <em>int</em> <strong>__fixtfsi</strong> <em>(long double <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005ffixxfsi"></a>Runtime Function: <em>int</em> <strong>__fixxfsi</strong> <em>(long double <var>a</var>)</em></dt>
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<dd><p>These functions convert <var>a</var> to a signed integer, rounding toward zero.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005ffixsfdi"></a>Runtime Function: <em>long</em> <strong>__fixsfdi</strong> <em>(float <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005ffixdfdi"></a>Runtime Function: <em>long</em> <strong>__fixdfdi</strong> <em>(double <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005ffixtfdi"></a>Runtime Function: <em>long</em> <strong>__fixtfdi</strong> <em>(long double <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005ffixxfdi"></a>Runtime Function: <em>long</em> <strong>__fixxfdi</strong> <em>(long double <var>a</var>)</em></dt>
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<dd><p>These functions convert <var>a</var> to a signed long, rounding toward zero.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005ffixsfti"></a>Runtime Function: <em>long long</em> <strong>__fixsfti</strong> <em>(float <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005ffixdfti"></a>Runtime Function: <em>long long</em> <strong>__fixdfti</strong> <em>(double <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005ffixtfti"></a>Runtime Function: <em>long long</em> <strong>__fixtfti</strong> <em>(long double <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005ffixxfti"></a>Runtime Function: <em>long long</em> <strong>__fixxfti</strong> <em>(long double <var>a</var>)</em></dt>
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<dd><p>These functions convert <var>a</var> to a signed long long, rounding toward zero.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005ffixunssfsi"></a>Runtime Function: <em>unsigned int</em> <strong>__fixunssfsi</strong> <em>(float <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005ffixunsdfsi"></a>Runtime Function: <em>unsigned int</em> <strong>__fixunsdfsi</strong> <em>(double <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005ffixunstfsi"></a>Runtime Function: <em>unsigned int</em> <strong>__fixunstfsi</strong> <em>(long double <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005ffixunsxfsi"></a>Runtime Function: <em>unsigned int</em> <strong>__fixunsxfsi</strong> <em>(long double <var>a</var>)</em></dt>
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<dd><p>These functions convert <var>a</var> to an unsigned integer, rounding
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toward zero. Negative values all become zero.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005ffixunssfdi"></a>Runtime Function: <em>unsigned long</em> <strong>__fixunssfdi</strong> <em>(float <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005ffixunsdfdi"></a>Runtime Function: <em>unsigned long</em> <strong>__fixunsdfdi</strong> <em>(double <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005ffixunstfdi"></a>Runtime Function: <em>unsigned long</em> <strong>__fixunstfdi</strong> <em>(long double <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005ffixunsxfdi"></a>Runtime Function: <em>unsigned long</em> <strong>__fixunsxfdi</strong> <em>(long double <var>a</var>)</em></dt>
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<dd><p>These functions convert <var>a</var> to an unsigned long, rounding
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toward zero. Negative values all become zero.
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</p></dd></dl>
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<dl>
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<dt><a name="index-_005f_005ffixunssfti"></a>Runtime Function: <em>unsigned long long</em> <strong>__fixunssfti</strong> <em>(float <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005ffixunsdfti"></a>Runtime Function: <em>unsigned long long</em> <strong>__fixunsdfti</strong> <em>(double <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005ffixunstfti"></a>Runtime Function: <em>unsigned long long</em> <strong>__fixunstfti</strong> <em>(long double <var>a</var>)</em></dt>
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<dt><a name="index-_005f_005ffixunsxfti"></a>Runtime Function: <em>unsigned long long</em> <strong>__fixunsxfti</strong> <em>(long double <var>a</var>)</em></dt>
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<dd><p>These functions convert <var>a</var> to an unsigned long long, rounding
|
||
|
|
toward zero. Negative values all become zero.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-_005f_005ffloatsisf"></a>Runtime Function: <em>float</em> <strong>__floatsisf</strong> <em>(int <var>i</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005ffloatsidf"></a>Runtime Function: <em>double</em> <strong>__floatsidf</strong> <em>(int <var>i</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005ffloatsitf"></a>Runtime Function: <em>long double</em> <strong>__floatsitf</strong> <em>(int <var>i</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005ffloatsixf"></a>Runtime Function: <em>long double</em> <strong>__floatsixf</strong> <em>(int <var>i</var>)</em></dt>
|
||
|
|
<dd><p>These functions convert <var>i</var>, a signed integer, to floating point.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-_005f_005ffloatdisf"></a>Runtime Function: <em>float</em> <strong>__floatdisf</strong> <em>(long <var>i</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005ffloatdidf"></a>Runtime Function: <em>double</em> <strong>__floatdidf</strong> <em>(long <var>i</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005ffloatditf"></a>Runtime Function: <em>long double</em> <strong>__floatditf</strong> <em>(long <var>i</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005ffloatdixf"></a>Runtime Function: <em>long double</em> <strong>__floatdixf</strong> <em>(long <var>i</var>)</em></dt>
|
||
|
|
<dd><p>These functions convert <var>i</var>, a signed long, to floating point.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-_005f_005ffloattisf"></a>Runtime Function: <em>float</em> <strong>__floattisf</strong> <em>(long long <var>i</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005ffloattidf"></a>Runtime Function: <em>double</em> <strong>__floattidf</strong> <em>(long long <var>i</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005ffloattitf"></a>Runtime Function: <em>long double</em> <strong>__floattitf</strong> <em>(long long <var>i</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005ffloattixf"></a>Runtime Function: <em>long double</em> <strong>__floattixf</strong> <em>(long long <var>i</var>)</em></dt>
|
||
|
|
<dd><p>These functions convert <var>i</var>, a signed long long, to floating point.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-_005f_005ffloatunsisf"></a>Runtime Function: <em>float</em> <strong>__floatunsisf</strong> <em>(unsigned int <var>i</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005ffloatunsidf"></a>Runtime Function: <em>double</em> <strong>__floatunsidf</strong> <em>(unsigned int <var>i</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005ffloatunsitf"></a>Runtime Function: <em>long double</em> <strong>__floatunsitf</strong> <em>(unsigned int <var>i</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005ffloatunsixf"></a>Runtime Function: <em>long double</em> <strong>__floatunsixf</strong> <em>(unsigned int <var>i</var>)</em></dt>
|
||
|
|
<dd><p>These functions convert <var>i</var>, an unsigned integer, to floating point.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-_005f_005ffloatundisf"></a>Runtime Function: <em>float</em> <strong>__floatundisf</strong> <em>(unsigned long <var>i</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005ffloatundidf"></a>Runtime Function: <em>double</em> <strong>__floatundidf</strong> <em>(unsigned long <var>i</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005ffloatunditf"></a>Runtime Function: <em>long double</em> <strong>__floatunditf</strong> <em>(unsigned long <var>i</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005ffloatundixf"></a>Runtime Function: <em>long double</em> <strong>__floatundixf</strong> <em>(unsigned long <var>i</var>)</em></dt>
|
||
|
|
<dd><p>These functions convert <var>i</var>, an unsigned long, to floating point.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-_005f_005ffloatuntisf"></a>Runtime Function: <em>float</em> <strong>__floatuntisf</strong> <em>(unsigned long long <var>i</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005ffloatuntidf"></a>Runtime Function: <em>double</em> <strong>__floatuntidf</strong> <em>(unsigned long long <var>i</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005ffloatuntitf"></a>Runtime Function: <em>long double</em> <strong>__floatuntitf</strong> <em>(unsigned long long <var>i</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005ffloatuntixf"></a>Runtime Function: <em>long double</em> <strong>__floatuntixf</strong> <em>(unsigned long long <var>i</var>)</em></dt>
|
||
|
|
<dd><p>These functions convert <var>i</var>, an unsigned long long, to floating point.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<a name="Comparison-functions-1"></a>
|
||
|
|
<h4 class="subsection">4.2.3 Comparison functions</h4>
|
||
|
|
|
||
|
|
<p>There are two sets of basic comparison functions.
|
||
|
|
</p>
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-_005f_005fcmpsf2"></a>Runtime Function: <em>int</em> <strong>__cmpsf2</strong> <em>(float <var>a</var>, float <var>b</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005fcmpdf2"></a>Runtime Function: <em>int</em> <strong>__cmpdf2</strong> <em>(double <var>a</var>, double <var>b</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005fcmptf2"></a>Runtime Function: <em>int</em> <strong>__cmptf2</strong> <em>(long double <var>a</var>, long double <var>b</var>)</em></dt>
|
||
|
|
<dd><p>These functions calculate <em>a <=> b</em>. That is, if <var>a</var> is less
|
||
|
|
than <var>b</var>, they return -1; if <var>a</var> is greater than <var>b</var>, they
|
||
|
|
return 1; and if <var>a</var> and <var>b</var> are equal they return 0. If
|
||
|
|
either argument is NaN they return 1, but you should not rely on this;
|
||
|
|
if NaN is a possibility, use one of the higher-level comparison
|
||
|
|
functions.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-_005f_005funordsf2"></a>Runtime Function: <em>int</em> <strong>__unordsf2</strong> <em>(float <var>a</var>, float <var>b</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005funorddf2"></a>Runtime Function: <em>int</em> <strong>__unorddf2</strong> <em>(double <var>a</var>, double <var>b</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005funordtf2"></a>Runtime Function: <em>int</em> <strong>__unordtf2</strong> <em>(long double <var>a</var>, long double <var>b</var>)</em></dt>
|
||
|
|
<dd><p>These functions return a nonzero value if either argument is NaN, otherwise 0.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<p>There is also a complete group of higher level functions which
|
||
|
|
correspond directly to comparison operators. They implement the ISO C
|
||
|
|
semantics for floating-point comparisons, taking NaN into account.
|
||
|
|
Pay careful attention to the return values defined for each set.
|
||
|
|
Under the hood, all of these routines are implemented as
|
||
|
|
</p>
|
||
|
|
<div class="smallexample">
|
||
|
|
<pre class="smallexample"> if (__unord<var>X</var>f2 (a, b))
|
||
|
|
return <var>E</var>;
|
||
|
|
return __cmp<var>X</var>f2 (a, b);
|
||
|
|
</pre></div>
|
||
|
|
|
||
|
|
<p>where <var>E</var> is a constant chosen to give the proper behavior for
|
||
|
|
NaN. Thus, the meaning of the return value is different for each set.
|
||
|
|
Do not rely on this implementation; only the semantics documented
|
||
|
|
below are guaranteed.
|
||
|
|
</p>
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-_005f_005feqsf2"></a>Runtime Function: <em>int</em> <strong>__eqsf2</strong> <em>(float <var>a</var>, float <var>b</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005feqdf2"></a>Runtime Function: <em>int</em> <strong>__eqdf2</strong> <em>(double <var>a</var>, double <var>b</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005feqtf2"></a>Runtime Function: <em>int</em> <strong>__eqtf2</strong> <em>(long double <var>a</var>, long double <var>b</var>)</em></dt>
|
||
|
|
<dd><p>These functions return zero if neither argument is NaN, and <var>a</var> and
|
||
|
|
<var>b</var> are equal.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-_005f_005fnesf2"></a>Runtime Function: <em>int</em> <strong>__nesf2</strong> <em>(float <var>a</var>, float <var>b</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005fnedf2"></a>Runtime Function: <em>int</em> <strong>__nedf2</strong> <em>(double <var>a</var>, double <var>b</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005fnetf2"></a>Runtime Function: <em>int</em> <strong>__netf2</strong> <em>(long double <var>a</var>, long double <var>b</var>)</em></dt>
|
||
|
|
<dd><p>These functions return a nonzero value if either argument is NaN, or
|
||
|
|
if <var>a</var> and <var>b</var> are unequal.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-_005f_005fgesf2"></a>Runtime Function: <em>int</em> <strong>__gesf2</strong> <em>(float <var>a</var>, float <var>b</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005fgedf2"></a>Runtime Function: <em>int</em> <strong>__gedf2</strong> <em>(double <var>a</var>, double <var>b</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005fgetf2"></a>Runtime Function: <em>int</em> <strong>__getf2</strong> <em>(long double <var>a</var>, long double <var>b</var>)</em></dt>
|
||
|
|
<dd><p>These functions return a value greater than or equal to zero if
|
||
|
|
neither argument is NaN, and <var>a</var> is greater than or equal to
|
||
|
|
<var>b</var>.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-_005f_005fltsf2"></a>Runtime Function: <em>int</em> <strong>__ltsf2</strong> <em>(float <var>a</var>, float <var>b</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005fltdf2"></a>Runtime Function: <em>int</em> <strong>__ltdf2</strong> <em>(double <var>a</var>, double <var>b</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005flttf2"></a>Runtime Function: <em>int</em> <strong>__lttf2</strong> <em>(long double <var>a</var>, long double <var>b</var>)</em></dt>
|
||
|
|
<dd><p>These functions return a value less than zero if neither argument is
|
||
|
|
NaN, and <var>a</var> is strictly less than <var>b</var>.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-_005f_005flesf2"></a>Runtime Function: <em>int</em> <strong>__lesf2</strong> <em>(float <var>a</var>, float <var>b</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005fledf2"></a>Runtime Function: <em>int</em> <strong>__ledf2</strong> <em>(double <var>a</var>, double <var>b</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005fletf2"></a>Runtime Function: <em>int</em> <strong>__letf2</strong> <em>(long double <var>a</var>, long double <var>b</var>)</em></dt>
|
||
|
|
<dd><p>These functions return a value less than or equal to zero if neither
|
||
|
|
argument is NaN, and <var>a</var> is less than or equal to <var>b</var>.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-_005f_005fgtsf2"></a>Runtime Function: <em>int</em> <strong>__gtsf2</strong> <em>(float <var>a</var>, float <var>b</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005fgtdf2"></a>Runtime Function: <em>int</em> <strong>__gtdf2</strong> <em>(double <var>a</var>, double <var>b</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005fgttf2"></a>Runtime Function: <em>int</em> <strong>__gttf2</strong> <em>(long double <var>a</var>, long double <var>b</var>)</em></dt>
|
||
|
|
<dd><p>These functions return a value greater than zero if neither argument
|
||
|
|
is NaN, and <var>a</var> is strictly greater than <var>b</var>.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<a name="Other-floating_002dpoint-functions"></a>
|
||
|
|
<h4 class="subsection">4.2.4 Other floating-point functions</h4>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-_005f_005fpowisf2"></a>Runtime Function: <em>float</em> <strong>__powisf2</strong> <em>(float <var>a</var>, int <var>b</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005fpowidf2"></a>Runtime Function: <em>double</em> <strong>__powidf2</strong> <em>(double <var>a</var>, int <var>b</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005fpowitf2"></a>Runtime Function: <em>long double</em> <strong>__powitf2</strong> <em>(long double <var>a</var>, int <var>b</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005fpowixf2"></a>Runtime Function: <em>long double</em> <strong>__powixf2</strong> <em>(long double <var>a</var>, int <var>b</var>)</em></dt>
|
||
|
|
<dd><p>These functions convert raise <var>a</var> to the power <var>b</var>.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-_005f_005fmulsc3"></a>Runtime Function: <em>complex float</em> <strong>__mulsc3</strong> <em>(float <var>a</var>, float <var>b</var>, float <var>c</var>, float <var>d</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005fmuldc3"></a>Runtime Function: <em>complex double</em> <strong>__muldc3</strong> <em>(double <var>a</var>, double <var>b</var>, double <var>c</var>, double <var>d</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005fmultc3"></a>Runtime Function: <em>complex long double</em> <strong>__multc3</strong> <em>(long double <var>a</var>, long double <var>b</var>, long double <var>c</var>, long double <var>d</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005fmulxc3"></a>Runtime Function: <em>complex long double</em> <strong>__mulxc3</strong> <em>(long double <var>a</var>, long double <var>b</var>, long double <var>c</var>, long double <var>d</var>)</em></dt>
|
||
|
|
<dd><p>These functions return the product of <em><var>a</var> + i<var>b</var></em> and
|
||
|
|
<em><var>c</var> + i<var>d</var></em>, following the rules of C99 Annex G.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<dl>
|
||
|
|
<dt><a name="index-_005f_005fdivsc3"></a>Runtime Function: <em>complex float</em> <strong>__divsc3</strong> <em>(float <var>a</var>, float <var>b</var>, float <var>c</var>, float <var>d</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005fdivdc3"></a>Runtime Function: <em>complex double</em> <strong>__divdc3</strong> <em>(double <var>a</var>, double <var>b</var>, double <var>c</var>, double <var>d</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005fdivtc3"></a>Runtime Function: <em>complex long double</em> <strong>__divtc3</strong> <em>(long double <var>a</var>, long double <var>b</var>, long double <var>c</var>, long double <var>d</var>)</em></dt>
|
||
|
|
<dt><a name="index-_005f_005fdivxc3"></a>Runtime Function: <em>complex long double</em> <strong>__divxc3</strong> <em>(long double <var>a</var>, long double <var>b</var>, long double <var>c</var>, long double <var>d</var>)</em></dt>
|
||
|
|
<dd><p>These functions return the quotient of <em><var>a</var> + i<var>b</var></em> and
|
||
|
|
<em><var>c</var> + i<var>d</var></em> (i.e., <em>(<var>a</var> + i<var>b</var>) / (<var>c</var>
|
||
|
|
+ i<var>d</var>)</em>), following the rules of C99 Annex G.
|
||
|
|
</p></dd></dl>
|
||
|
|
|
||
|
|
<hr>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
Next: <a href="Decimal-float-library-routines.html#Decimal-float-library-routines" accesskey="n" rel="next">Decimal float library routines</a>, Previous: <a href="Integer-library-routines.html#Integer-library-routines" accesskey="p" rel="prev">Integer library routines</a>, Up: <a href="Libgcc.html#Libgcc" accesskey="u" rel="up">Libgcc</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>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
</body>
|
||
|
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</html>
|