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This is libquadmath.info, produced by makeinfo version 4.13 from
/space/rguenther/gcc-7.2.0/gcc-7.2.0/libquadmath/libquadmath.texi.
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Copyright (C) 2010-2017 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."
(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
Copyright (C) 2010-2017 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."
(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
***********************
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
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
`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.
`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:
`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
`logbq': get exponent of the value
`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
`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:
* `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
3.1 `strtoflt128' -- Convert from string
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========================================
The function `strtoflt128' converts a string into a `__float128' number.
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Syntax
`__float128 strtoflt128 (const char *s, char **sp)'
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_Arguments_:
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
3.2 `quadmath_snprintf' -- Convert to string
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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
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
`int quadmath_snprintf (char *s, size_t size, const char *format,
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...)'
_Arguments_:
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
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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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)
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
that copyright holder, and you cure the violation prior to 30 days
after your receipt of the notice.
Termination of your rights under this section does not terminate
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
`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
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have the option of following the terms and conditions either of
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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.
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
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A "Massive Multiauthor Collaboration" (or "MMC") contained in the
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"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
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"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
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License somewhere other than this MMC, and subsequently
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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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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
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
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
reported via `https://gcc.gnu.org/bugs/'.
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Tag Table:
Node: Top1684
Node: Typedef and constants2418
Node: Math Library Routines3858
Node: I/O Library Routines7698
Node: strtoflt1288023
Node: quadmath_snprintf8781
Node: GNU Free Documentation License10989
Node: Reporting Bugs36155
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End Tag Table