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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [cmath/] [s_cproj.c] - Blame information for rev 258

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Line No. Rev Author Line
1 207 jeremybenn
/* Compute projection of complex double value to Riemann sphere.
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   Copyright (C) 1997, 1999 Free Software Foundation, Inc.
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   This file is part of the GNU C Library.
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   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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   The GNU C Library is free software; you can redistribute it and/or
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   modify it under the terms of the GNU Lesser General Public
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   License as published by the Free Software Foundation; either
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   version 2.1 of the License, or (at your option) any later version.
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   The GNU C Library is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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   Lesser General Public License for more details.
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   You should have received a copy of the GNU Lesser General Public
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   License along with the GNU C Library; if not, write to the Free
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   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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   02111-1307 USA.  */
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#include <complex.h>
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#include <math.h>
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#include "math_private.h"
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__complex__ double
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__cproj (__complex__ double x)
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{
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  __complex__ double res;
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  if (isnan (__real__ x) && isnan (__imag__ x))
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    return x;
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  else if (!isfinite (__real__ x) || !isfinite (__imag__ x))
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    {
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      __real__ res = INFINITY;
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      __imag__ res = __copysign (0.0, __imag__ x);
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    }
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  else
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    {
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      double den = __real__ x * __real__ x + __imag__ x * __imag__ x + 1.0;
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      __real__ res = (2.0 * __real__ x) / den;
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      __imag__ res = (2.0 * __imag__ x) / den;
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    }
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  return res;
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}
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weak_alias (__cproj, cproj)
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#ifdef NO_LONG_DOUBLE
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strong_alias (__cproj, __cprojl)
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weak_alias (__cproj, cprojl)
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#endif

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