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git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/ieee754/ldbl-128ibm/s_cprojl.c
1 /* Compute projection of complex long double value to Riemann sphere.
2 Copyright (C) 1997,1999,2006 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
23 #include <math_ldbl_opt.h>
25 __complex__
long double
26 __cprojl (__complex__
long double x
)
28 __complex__
long double res
;
30 if (isnan (__real__ x
) && isnan (__imag__ x
))
32 else if (!isfinite (__real__ x
) || !isfinite (__imag__ x
))
34 __real__ res
= INFINITY
;
35 __imag__ res
= __copysignl (0.0, __imag__ x
);
39 long double den
= (__real__ x
* __real__ x
+ __imag__ x
* __imag__ x
42 __real__ res
= (2.0 * __real__ x
) / den
;
43 __imag__ res
= (2.0 * __imag__ x
) / den
;
44 /* __gcc_qmul does not respect -0.0 so we need the following fixup. */
45 if (__real__ x
== 0.0)
46 __real__ res
= __real__ x
;
48 if (__imag__ x
== 0.0)
49 __imag__ res
= __imag__ x
;
54 long_double_symbol (libm
, __cprojl
, cprojl
);