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This is libquadmath.info, produced by makeinfo version 4.12 from
/space/rguenther/gcc-5.2.0/gcc-5.2.0/libquadmath/libquadmath.texi.
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Copyright (C) 2010-2015 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU Free Documentation License,
Version 1.2 or any later version published by the Free Software
Foundation; with no Invariant Sections, with the Front-Cover Texts
being "A GNU Manual," and with the Back-Cover Texts as in (a)
below. A copy of the license is included in the section entitled
"GNU Free Documentation License."
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(a) The FSF's Back-Cover Text is: "You have the freedom to copy
and modify this GNU manual.
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INFO-DIR-SECTION GNU Libraries
START-INFO-DIR-ENTRY
* libquadmath: (libquadmath). GCC Quad-Precision Math Library
END-INFO-DIR-ENTRY
This manual documents the GCC Quad-Precision Math Library API.
Published by the Free Software Foundation 51 Franklin Street, Fifth
Floor Boston, MA 02110-1301 USA
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Copyright (C) 2010-2015 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU Free Documentation License,
Version 1.2 or any later version published by the Free Software
Foundation; with no Invariant Sections, with the Front-Cover Texts
being "A GNU Manual," and with the Back-Cover Texts as in (a)
below. A copy of the license is included in the section entitled
"GNU Free Documentation License."
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(a) The FSF's Back-Cover Text is: "You have the freedom to copy
and modify this GNU manual.
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File: libquadmath.info, Node: Top, Next: Typedef and constants, Up: (dir)
Introduction
************
This manual documents the usage of libquadmath, the GCC Quad-Precision
Math Library Application Programming Interface (API).
* Menu:
* Typedef and constants:: Defined data types and constants
* Math Library Routines:: The Libquadmath math runtime application
programming interface.
* I/O Library Routines:: The Libquadmath I/O runtime application
programming interface.
* GNU Free Documentation License::
How you can copy and share this manual.
* Reporting Bugs:: How to report bugs in GCC Libquadmath.

File: libquadmath.info, Node: Typedef and constants, Next: Math Library Routines, Prev: Top, Up: Top
1 Typedef and constants
***********************
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The following data type has been defined via `typedef'.
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`__complex128': `__float128'-based complex number
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The following macros are defined, which give the numeric limits of
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the `__float128' data type.
`FLT128_MAX': largest finite number
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`FLT128_MIN': smallest positive number with full precision
`FLT128_EPSILON': difference between 1 and the next larger
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representable number
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`FLT128_DENORM_MIN': smallest positive denormalized number
`FLT128_MANT_DIG': number of digits in the mantissa (bit precision)
`FLT128_MIN_EXP': maximal negative exponent
`FLT128_MAX_EXP': maximal positive exponent
`FLT128_DIG': number of decimal digits in the mantissa
`FLT128_MIN_10_EXP': maximal negative decimal exponent
`FLT128_MAX_10_EXP': maximal positive decimal exponent
The following mathematical constants of type `__float128' are
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defined.
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`M_Eq': the constant e (Euler's number)
`M_LOG2Eq': binary logarithm of 2
`M_LOG10Eq': common, decimal logarithm of 2
`M_LN2q': natural logarithm of 2
`M_LN10q': natural logarithm of 10
`M_PIq': pi
`M_PI_2q': pi divided by two
`M_PI_4q': pi divided by four
`M_1_PIq': one over pi
`M_2_PIq': one over two pi
`M_2_SQRTPIq': two over square root of pi
`M_SQRT2q': square root of 2
`M_SQRT1_2q': one over square root of 2
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File: libquadmath.info, Node: Math Library Routines, Next: I/O Library Routines, Prev: Typedef and constants, Up: Top
2 Math Library Routines
***********************
The following mathematical functions are available:
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`acosq': arc cosine function
`acoshq': inverse hyperbolic cosine function
`asinq': arc sine function
`asinhq': inverse hyperbolic sine function
`atanq': arc tangent function
`atanhq': inverse hyperbolic tangent function
`atan2q': arc tangent function
`cbrtq': cube root function
`ceilq': ceiling value function
`copysignq': copy sign of a number
`coshq': hyperbolic cosine function
`cosq': cosine function
`erfq': error function
`erfcq': complementary error function
`expq': exponential function
`expm1q': exponential minus 1 function
`fabsq': absolute value function
`fdimq': positive difference function
`finiteq': check finiteness of value
`floorq': floor value function
`fmaq': fused multiply and add
`fmaxq': determine maximum of two values
`fminq': determine minimum of two values
`fmodq': remainder value function
`frexpq': extract mantissa and exponent
`hypotq': Eucledian distance function
`ilogbq': get exponent of the value
`isinfq': check for infinity
`isnanq': check for not a number
`j0q': Bessel function of the first kind, first order
`j1q': Bessel function of the first kind, second order
`jnq': Bessel function of the first kind, N-th order
`ldexpq': load exponent of the value
`lgammaq': logarithmic gamma function
`llrintq': round to nearest integer value
`llroundq': round to nearest integer value away from zero
`logq': natural logarithm function
`log10q': base 10 logarithm function
`log1pq': compute natural logarithm of the value plus one
`log2q': base 2 logarithm function
`lrintq': round to nearest integer value
`lroundq': round to nearest integer value away from zero
`modfq': decompose the floating-point number
`nanq': return quiet NaN
`nearbyintq': round to nearest integer
`nextafterq': next representable floating-point number
`powq': power function
`remainderq': remainder function
`remquoq': remainder and part of quotient
`rintq': round-to-nearest integral value
`roundq': round-to-nearest integral value, return `__float128'
`scalblnq': compute exponent using `FLT_RADIX'
`scalbnq': compute exponent using `FLT_RADIX'
`signbitq': return sign bit
`sincosq': calculate sine and cosine simultaneously
`sinhq': hyperbolic sine function
`sinq': sine function
`sqrtq': square root function
`tanq': tangent function
`tanhq': hyperbolic tangent function
`tgammaq': true gamma function
`truncq': round to integer, towards zero
`y0q': Bessel function of the second kind, first order
`y1q': Bessel function of the second kind, second order
`ynq': Bessel function of the second kind, N-th order
`cabsq' complex absolute value function
`cargq': calculate the argument
`cimagq' imaginary part of complex number
`crealq': real part of complex number
`cacoshq': complex arc hyperbolic cosine function
`cacosq': complex arc cosine function
`casinhq': complex arc hyperbolic sine function
`casinq': complex arc sine function
`catanhq': complex arc hyperbolic tangent function
`catanq': complex arc tangent function
`ccosq' complex cosine function:
`ccoshq': complex hyperbolic cosine function
`cexpq': complex exponential function
`cexpiq': computes the exponential function of "i" times a
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real value
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`clogq': complex natural logarithm
`clog10q': complex base 10 logarithm
`conjq': complex conjugate function
`cpowq': complex power function
`cprojq': project into Riemann Sphere
`csinq': complex sine function
`csinhq': complex hyperbolic sine function
`csqrtq': complex square root
`ctanq': complex tangent function
`ctanhq': complex hyperbolic tangent function
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File: libquadmath.info, Node: I/O Library Routines, Next: GNU Free Documentation License, Prev: Math Library Routines, Up: Top
3 I/O Library Routines
**********************
* Menu:
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* `strtoflt128': strtoflt128, Convert from string
* `quadmath_snprintf': quadmath_snprintf, Convert to string
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File: libquadmath.info, Node: strtoflt128, Next: quadmath_snprintf, Up: I/O Library Routines
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3.1 `strtoflt128' -- Convert from string
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========================================
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The function `strtoflt128' converts a string into a `__float128' number.
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Syntax
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`__float128 strtoflt128 (const char *s, char **sp)'
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_Arguments_:
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S input string
SP the address of the next character in the string
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The argument SP contains, if not `NULL', the address of the next
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character following the parts of the string, which have been read.
Example
#include <quadmath.h>
int main ()
{
__float128 r;
r = strtoflt128 ("1.2345678", NULL);
return 0;
}

File: libquadmath.info, Node: quadmath_snprintf, Prev: strtoflt128, Up: I/O Library Routines
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3.2 `quadmath_snprintf' -- Convert to string
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============================================
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The function `quadmath_snprintf' converts a `__float128' floating-point
number into a string. It is a specialized alternative to `snprintf',
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where the format string is restricted to a single conversion specifier
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with `Q' modifier and conversion specifier `e', `E', `f', `F', `g',
`G', `a' or `A', with no extra characters before or after the
conversion specifier. The `%m$' or `*m$' style must not be used in the
format.
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Syntax
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`int quadmath_snprintf (char *s, size_t size, const char *format,
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...)'
_Arguments_:
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S output string
SIZE byte size of the string, including tailing NUL
FORMAT conversion specifier string
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Note
On some targets when supported by the C library hooks are installed
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for `printf' family of functions, so that `printf ("%Qe", 1.2Q);'
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etc. works too.
Example
#include <quadmath.h>
#include <stdlib.h>
#include <stdio.h>
int main ()
{
__float128 r;
int prec = 20;
int width = 46;
char buf[128];
r = 2.0q;
r = sqrtq (r);
int n = quadmath_snprintf (buf, sizeof buf, "%+-#*.20Qe", width, r);
if ((size_t) n < sizeof buf)
printf ("%s\n", buf);
/* Prints: +1.41421356237309504880e+00 */
quadmath_snprintf (buf, sizeof buf, "%Qa", r);
if ((size_t) n < sizeof buf)
printf ("%s\n", buf);
/* Prints: 0x1.6a09e667f3bcc908b2fb1366ea96p+0 */
n = quadmath_snprintf (NULL, 0, "%+-#46.*Qe", prec, r);
if (n > -1)
{
char *str = malloc (n + 1);
if (str)
{
quadmath_snprintf (str, n + 1, "%+-#46.*Qe", prec, r);
printf ("%s\n", str);
/* Prints: +1.41421356237309504880e+00 */
}
free (str);
}
return 0;
}
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File: libquadmath.info, Node: GNU Free Documentation License, Next: Reporting Bugs, Prev: I/O Library Routines, Up: Top
GNU Free Documentation License
******************************
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multiple identical Invariant Sections may be replaced with a single
copy. If there are multiple Invariant Sections with the same name
but different contents, make the title of each such section unique
by adding at the end of it, in parentheses, the name of the
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unique number. Make the same adjustment to the section titles in
the list of Invariant Sections in the license notice of the
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In the combination, you must combine any sections Entitled
"History" in the various original documents, forming one section
Entitled "History"; likewise combine any sections Entitled
"Acknowledgements", and any sections Entitled "Dedications". You
must delete all sections Entitled "Endorsements."
6. COLLECTIONS OF DOCUMENTS
You may make a collection consisting of the Document and other
documents released under this License, and replace the individual
copies of this License in the various documents with a single copy
that is included in the collection, provided that you follow the
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rules of this License for verbatim copying of each of the
documents in all other respects.
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You may extract a single document from such a collection, and
distribute it individually under this License, provided you insert
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a copy of this License into the extracted document, and follow
this License in all other respects regarding verbatim copying of
that document.
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7. AGGREGATION WITH INDEPENDENT WORKS
A compilation of the Document or its derivatives with other
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separate and independent documents or works, in or on a volume of
a storage or distribution medium, is called an "aggregate" if the
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copyright resulting from the compilation is not used to limit the
legal rights of the compilation's users beyond what the individual
works permit. When the Document is included in an aggregate, this
License does not apply to the other works in the aggregate which
are not themselves derivative works of the Document.
If the Cover Text requirement of section 3 is applicable to these
copies of the Document, then if the Document is less than one half
of the entire aggregate, the Document's Cover Texts may be placed
on covers that bracket the Document within the aggregate, or the
electronic equivalent of covers if the Document is in electronic
form. Otherwise they must appear on printed covers that bracket
the whole aggregate.
8. TRANSLATION
Translation is considered a kind of modification, so you may
distribute translations of the Document under the terms of section
4. Replacing Invariant Sections with translations requires special
permission from their copyright holders, but you may include
translations of some or all Invariant Sections in addition to the
original versions of these Invariant Sections. You may include a
translation of this License, and all the license notices in the
Document, and any Warranty Disclaimers, provided that you also
include the original English version of this License and the
original versions of those notices and disclaimers. In case of a
disagreement between the translation and the original version of
this License or a notice or disclaimer, the original version will
prevail.
If a section in the Document is Entitled "Acknowledgements",
"Dedications", or "History", the requirement (section 4) to
Preserve its Title (section 1) will typically require changing the
actual title.
9. TERMINATION
You may not copy, modify, sublicense, or distribute the Document
except as expressly provided under this License. Any attempt
otherwise to copy, modify, sublicense, or distribute it is void,
and will automatically terminate your rights under this License.
However, if you cease all violation of this License, then your
license from a particular copyright holder is reinstated (a)
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provisionally, unless and until the copyright holder explicitly
and finally terminates your license, and (b) permanently, if the
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copyright holder fails to notify you of the violation by some
reasonable means prior to 60 days after the cessation.
Moreover, your license from a particular copyright holder is
reinstated permanently if the copyright holder notifies you of the
violation by some reasonable means, this is the first time you have
received notice of violation of this License (for any work) from
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after your receipt of the notice.
Termination of your rights under this section does not terminate
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the licenses of parties who have received copies or rights from
you under this License. If your rights have been terminated and
not permanently reinstated, receipt of a copy of some or all of
the same material does not give you any rights to use it.
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10. FUTURE REVISIONS OF THIS LICENSE
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The Free Software Foundation may publish new, revised versions of
the GNU Free Documentation License from time to time. Such new
versions will be similar in spirit to the present version, but may
differ in detail to address new problems or concerns. See
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`http://www.gnu.org/copyleft/'.
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Each version of the License is given a distinguishing version
number. If the Document specifies that a particular numbered
version of this License "or any later version" applies to it, you
have the option of following the terms and conditions either of
that specified version or of any later version that has been
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published (not as a draft) by the Free Software Foundation. If
the Document does not specify a version number of this License,
you may choose any version ever published (not as a draft) by the
Free Software Foundation. If the Document specifies that a proxy
can decide which future versions of this License can be used, that
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proxy's public statement of acceptance of a version permanently
authorizes you to choose that version for the Document.
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11. RELICENSING
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"Massive Multiauthor Collaboration Site" (or "MMC Site") means any
World Wide Web server that publishes copyrightable works and also
provides prominent facilities for anybody to edit those works. A
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A "Massive Multiauthor Collaboration" (or "MMC") contained in the
site means any set of copyrightable works thus published on the MMC
site.
"CC-BY-SA" means the Creative Commons Attribution-Share Alike 3.0
license published by Creative Commons Corporation, a not-for-profit
corporation with a principal place of business in San Francisco,
California, as well as future copyleft versions of that license
published by that same organization.
"Incorporate" means to publish or republish a Document, in whole or
in part, as part of another Document.
An MMC is "eligible for relicensing" if it is licensed under this
License, and if all works that were first published under this
License somewhere other than this MMC, and subsequently
incorporated in whole or in part into the MMC, (1) had no cover
texts or invariant sections, and (2) were thus incorporated prior
to November 1, 2008.
The operator of an MMC Site may republish an MMC contained in the
site under CC-BY-SA on the same site at any time before August 1,
2009, provided the MMC is eligible for relicensing.
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2012-03-27 23:13:14 +00:00
ADDENDUM: How to use this License for your documents
====================================================
To use this License in a document you have written, include a copy of
the License in the document and put the following copyright and license
notices just after the title page:
Copyright (C) YEAR YOUR NAME.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3
or any later version published by the Free Software Foundation;
with no Invariant Sections, no Front-Cover Texts, and no Back-Cover
Texts. A copy of the license is included in the section entitled ``GNU
Free Documentation License''.
If you have Invariant Sections, Front-Cover Texts and Back-Cover
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Texts, replace the "with...Texts." line with this:
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with the Invariant Sections being LIST THEIR TITLES, with
the Front-Cover Texts being LIST, and with the Back-Cover Texts
being LIST.
If you have Invariant Sections without Cover Texts, or some other
combination of the three, merge those two alternatives to suit the
situation.
If your document contains nontrivial examples of program code, we
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recommend releasing these examples in parallel under your choice of
free software license, such as the GNU General Public License, to
permit their use in free software.
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File: libquadmath.info, Node: Reporting Bugs, Prev: GNU Free Documentation License, Up: Top
4 Reporting Bugs
****************
Bugs in the GCC Quad-Precision Math Library implementation should be
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reported via `http://gcc.gnu.org/bugs.html'.
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Tag Table:
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Node: Top1684
Node: Typedef and constants2418
Node: Math Library Routines3858
Node: I/O Library Routines7662
Node: strtoflt1287987
Node: quadmath_snprintf8745
Node: GNU Free Documentation License10953
Node: Reporting Bugs36119
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End Tag Table