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<html lang="en"><head><title>Using the GNU Compiler Collection (GCC)</title><meta http-equiv="Content-Type" content="text/html"><meta name="description" content="Using the GNU Compiler Collection (GCC)"><meta name="generator" content="makeinfo 4.6"><!--Copyright © 1988, 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,1999, 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. <p>Permission is granted to copy, distribute and/or modify this documentunder the terms of the GNU Free Documentation License, Version 1.2 orany later version published by the Free Software Foundation; with theInvariant Sections being "GNU General Public License" and "FundingFree Software", the Front-Cover texts being (a) (see below), and withthe Back-Cover Texts being (b) (see below). A copy of the license isincluded in the section entitled "GNU Free Documentation License". <p>(a) The FSF's Front-Cover Text is: <p>A GNU Manual <p>(b) The FSF's Back-Cover Text is: <p>You have freedom to copy and modify this GNU Manual, like GNU software. Copies published by the Free Software Foundation raise funds for GNU development.--><meta http-equiv="Content-Style-Type" content="text/css"><style type="text/css"><!-- pre.display { font-family:inherit } pre.format { font-family:inherit } pre.smalldisplay { font-family:inherit; font-size:smaller } pre.smallformat { font-family:inherit; font-size:smaller } pre.smallexample { font-size:smaller } pre.smalllisp { font-size:smaller }--></style></head><body><div class="node"><p>Node: <a name="Floating%20point%20implementation">Floating point implementation</a>,Next: <a rel="next" accesskey="n" href="Arrays-and-pointers-implementation.html#Arrays%20and%20pointers%20implementation">Arrays and pointers implementation</a>,Previous: <a rel="previous" accesskey="p" href="Integers-implementation.html#Integers%20implementation">Integers implementation</a>,Up: <a rel="up" accesskey="u" href="C-Implementation.html#C%20Implementation">C Implementation</a><hr><br></div><h3 class="section">Floating point</h3> <ul><li><cite>The accuracy of the floating-point operations and of the libraryfunctions in </cite><code><math.h></code><cite> and </cite><code><complex.h></code><cite> that return floating-pointresults (5.2.4.2.2).</cite> <li><cite>The rounding behaviors characterized by non-standard valuesof </cite><code>FLT_ROUNDS</code><cite> (5.2.4.2.2).</cite> <li><cite>The evaluation methods characterized by non-standard negativevalues of </cite><code>FLT_EVAL_METHOD</code><cite> (5.2.4.2.2).</cite> <li><cite>The direction of rounding when an integer is converted to afloating-point number that cannot exactly represent the originalvalue (6.3.1.4).</cite> <li><cite>The direction of rounding when a floating-point number isconverted to a narrower floating-point number (6.3.1.5).</cite> <li><cite>How the nearest representable value or the larger or smallerrepresentable value immediately adjacent to the nearest representablevalue is chosen for certain floating constants (6.4.4.2).</cite> <li><cite>Whether and how floating expressions are contracted when notdisallowed by the </cite><code>FP_CONTRACT</code><cite> pragma (6.5).</cite> <li><cite>The default state for the </cite><code>FENV_ACCESS</code><cite> pragma (7.6.1).</cite> <li><cite>Additional floating-point exceptions, rounding modes, environments,and classifications, and their macro names (7.6, 7.12).</cite> <li><cite>The default state for the </cite><code>FP_CONTRACT</code><cite> pragma (7.12.2).</cite> <li><cite>Whether the "inexact" floating-point exception can be raisedwhen the rounded result actually does equal the mathematical resultin an IEC 60559 conformant implementation (F.9).</cite> <li><cite>Whether the "underflow" (and "inexact") floating-pointexception can be raised when a result is tiny but not inexact in anIEC 60559 conformant implementation (F.9).</cite></ul> </body></html>⌨️ 快捷键说明
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