gcc/libgfortran/generated/trig_c8.c

72 lines
1.8 KiB
C
Raw Normal View History

/* Complex trig functions
Copyright 2002 Free Software Foundation, Inc.
Contributed by Paul Brook <paul@nowt.org>
This file is part of the GNU Fortran 95 runtime library (libgfor).
Libgfortran is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
Libgfortran is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with libgfor; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <math.h>
#include "libgfortran.h"
/* Complex number z = a + ib. */
/* sin(z) = sin(a)cosh(b) + icos(a)sinh(b) */
GFC_COMPLEX_8
csin (GFC_COMPLEX_8 a)
{
GFC_REAL_8 r;
GFC_REAL_8 i;
GFC_COMPLEX_8 v;
r = REALPART (a);
i = IMAGPART (a);
COMPLEX_ASSIGN (v, sin (r) * cosh (i), cos (r) * sinh (i));
return v;
}
/* cos(z) = cos(a)cosh(b) - isin(a)sinh(b) */
GFC_COMPLEX_8
ccos (GFC_COMPLEX_8 a)
{
GFC_REAL_8 r;
GFC_REAL_8 i;
GFC_COMPLEX_8 v;
r = REALPART (a);
i = IMAGPART (a);
COMPLEX_ASSIGN (v, cos (r) * cosh (i), - (sin (r) * sinh (i)));
return v;
}
/* tan(z) = (tan(a) + itanh(b)) / (1 - itan(a)tanh(b)) */
GFC_COMPLEX_8
ctan (GFC_COMPLEX_8 a)
{
GFC_REAL_8 rt;
GFC_REAL_8 it;
GFC_COMPLEX_8 n;
GFC_COMPLEX_8 d;
rt = tan (REALPART (a));
it = tanh (IMAGPART (a));
COMPLEX_ASSIGN (n, rt, it);
COMPLEX_ASSIGN (d , 1, - (rt * it));
return n / d;
}