gcc/libquadmath/libquadmath.texi

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@c %**start of header
@setfilename libquadmath.info
@settitle GCC libquadmath
@c %**end of header

@copying
Copyright @copyright{} 2010 Free Software Foundation, Inc.

@quotation
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.
@end quotation
@end copying

@ifinfo
@dircategory GNU Libraries
@direntry
* libquadmath: (libquadmath).                  GCC Quad-Precision Math Library
@end direntry

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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@end ifinfo


@setchapternewpage odd

@titlepage
@title The GCC Quad-Precision Math Library
@page
@vskip 0pt plus 1filll
@comment For the @value{version-GCC} Version*
@sp 1
Published by the Free Software Foundation @*
51 Franklin Street, Fifth Floor@*
Boston, MA 02110-1301, USA@*
@sp 1
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@end titlepage

@summarycontents
@contents
@page


@node Top
@top Introduction
@cindex Introduction

This manual documents the usage of libquadmath, the GCC Quad-Precision
Math Library Application Programming Interface (API).


@comment
@comment  When you add a new menu item, please keep the right hand
@comment  aligned to the same column.  Do not use tabs.  This provides
@comment  better formatting.
@comment
@menu
* 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.
@c * Index::                      Index of this documentation.
@end menu


@c ---------------------------------------------------------------------
@c Math routines
@c ---------------------------------------------------------------------

@node Math Library Routines
@chapter Math Library Routines

The following mathematical functions are available:

@table @asis
@item @code{acosq}: arc cosine function
@item @code{acoshq}: inverse hyperbolic cosine function
@item @code{asinq}: arc sine function
@item @code{asinhq}: inverse hyperbolic sine function
@item @code{atanq}: arc tangent function
@item @code{atanhq}: inverse hyperbolic tangent function
@item @code{atan2q}: arc tangent function
@item @code{cbrtq}: cube root function
@item @code{ceilq}: ceiling value function
@item @code{copysignq}: copy sign of a number
@item @code{coshq}: hyperbolic cosine function
@item @code{cosq}: cosine function
@item @code{erfq}: error function
@item @code{erfcq}: complementary error function
@item @code{expq}: exponential function
@item @code{expm1q}: exponential minus 1 function
@need 800
@item @code{fabsq}: absolute value function
@item @code{finiteq}: check finiteness of value
@item @code{floorq}: floor value function
@item @code{fmodq}: remainder value function
@item @code{frexpq}: extract mantissa and exponent
@item @code{hypotq}: Eucledian distance function
@item @code{isinfq}: check for infinity
@item @code{isnanq}: check for not a number
@item @code{j0q}: Bessel function of the first kind, first order
@item @code{j1q}: Bessel function of the first kind, second order
@item @code{jnq}: Bessel function of the first kind, @var{n}-th order
@item @code{ldexpq}: load exponent of the value
@item @code{lgammaq}: logarithmic gamma function
@item @code{llroundq}: round to nearest integer value away from zero
@item @code{logq}: natural logarithm function
@item @code{log10q}: base 10 logarithm function
@item @code{log1pq}: compute natural logarithm of the value plus one
@need 800
@item @code{lroundq}: round to nearest integer value away from zero
@item @code{modfq}: decompose the floating-point number
@item @code{nanq}: return quiet NaN
@item @code{nextafterq}: next representable floating-point number
@item @code{powq}: power function
@item @code{remainderq}: remainder function
@item @code{rintq}: round-to-nearest integral value
@item @code{roundq}: round-to-nearest integral value, return @code{__float128}
@item @code{scalblnq}: compute exponent using @code{FLT_RADIX}
@item @code{scalbnq}: compute exponent using @code{FLT_RADIX}
@item @code{signbitq}: return sign bit
@item @code{sincosq}: calculate sine and cosine simulataneously
@item @code{sinhq}: hyperbolic sine function
@item @code{sinq}: sine function
@item @code{sqrtq}: square root function
@item @code{tanq}: tangent function
@item @code{tanhq}: hyperbolic tangent function
@need 800
@item @code{tgammaq}: true gamma function
@item @code{truncq}: round to integer, towards zero
@item @code{y0q}: Bessel function of the second kind, first order
@item @code{y1q}: Bessel function of the second kind, second order
@item @code{ynq}: Bessel function of the second kind, @var{n}-th order
@item @code{cabsq} complex absolute value function:
@item @code{cargq}: calculate the argument
@item @code{ccosq} complex cosine function:
@item @code{ccoshq}: complex hyperbolic cosine function
@item @code{cexpq}: complex exponential function
@item @code{cexpiq}: computes the exponential function of ``i'' times a
                     real value
@item @code{clogq}: complex natural logarithm
@item @code{clog10q}: complex base 10 logarithm
@item @code{cpowq}: complex power function
@item @code{csinq}: complex sine function
@item @code{csinhq}: complex hyperbolic sine function
@need 800
@item @code{csqrtq}: complex square root
@item @code{ctanq}: complex tangent function
@item @code{ctanhq}: complex hyperbolic tangent function
@end table


@c ---------------------------------------------------------------------
@c I/O routines
@c ---------------------------------------------------------------------

@node I/O Library Routines
@chapter I/O Library Routines

@menu
* @code{quadmath_strtopQ}:  quadmath_strtopQ,  Convert from string
* @code{quadmath_dtoaq}:    quadmath_dtoaq,    Convert to string
@end menu


@node quadmath_strtopQ
@section @code{quadmath_strtopQ} --- Convert from string

The function @code{dmath_strtopQ} converts a string into a
@code{__float128} number.

@table @asis
@item Syntax
@code{int quadmath_strtopQ (const char *s, char **sp, void *V)}

@c The return values are defined in gdtoa/gdtoa.h STRTOG_*
@c However, the values are currently not exported - thus we
@c do not define them here, either.

@item @emph{Arguments}:
@multitable @columnfractions .15 .70
@item @var{s}  @tab input string
@item @var{sp} @tab the address of the next character in the string
@item @var{V}  @tab @code{__float128} containing the converted number
@end multitable

The argument @var{sp} contains, if not @code{NULL}, the address of the
next character following the parts of the string, which have been read.

@item Example
@smallexample
#include <quadmath.h>

int main ()
@{
  __float128 r;
  char str[200];

  quadmath_strtopQ ("1.2345678", NULL, &r);

  return 0;
@}
@end smallexample
@end table


@node quadmath_dtoaq
@section @code{quadmath_dtoaq} --- Convert to string

The function @code{quadmath_dtoaq} converts a @code{__float128} floating-point
number into a string.

@table @asis
@item Syntax
@code{void quadmath_dtoaq (char *s, size_t size, size_t n, __float128 x)}

@item @emph{Arguments}:
@multitable @columnfractions .15 .70
@item @var{s}    @tab output string
@item @var{size} @tab byte size of the string, including tailing NUL
@item @var{n}    @tab number of digits after the decimal point
@item @var{x}    @tab the number to be converted
@end multitable

@item Example
@smallexample
#include <quadmath.h>

int main ()
@{
  __float128 r;
  char str[200];

  r = 2.0q;
  r = sqrtq(r);
  quadmath_dtoaq (str, sizeof (str), 20, r);
  printf("%s\n", str);
  /* Prints: +1.41421356237309504880e+00 */
  return 0;
@}
@end smallexample
@end table


@c ---------------------------------------------------------------------
@c GNU Free Documentation License
@c ---------------------------------------------------------------------

@include fdl.texi

@c ---------------------------------------------------------------------
@c Reporting Bugs
@c ---------------------------------------------------------------------

@node Reporting Bugs
@chapter Reporting Bugs

Bugs in the GCC Quad-Precision Math Library implementation should be
reported via @value{BUGURL}.


@c ---------------------------------------------------------------------
@c Index
@c ---------------------------------------------------------------------

@c @node Index
@c @unnumbered Index
@c 
@c @printindex cp

@bye