From abfbdde177c3a7155070dda1b2cdc8292054cc26 Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Wed, 14 Jul 1999 00:54:57 +0000 Subject: Update. --- sysdeps/generic/s_csin.c | 131 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 131 insertions(+) create mode 100644 sysdeps/generic/s_csin.c (limited to 'sysdeps/generic/s_csin.c') diff --git a/sysdeps/generic/s_csin.c b/sysdeps/generic/s_csin.c new file mode 100644 index 0000000000..6627387d42 --- /dev/null +++ b/sysdeps/generic/s_csin.c @@ -0,0 +1,131 @@ +/* Complex sine function for double. + Copyright (C) 1997 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper , 1997. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; 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 +#include +#include + +#include "math_private.h" + + +__complex__ double +__csin (__complex__ double x) +{ + __complex__ double retval; + int negate = signbit (__real__ x); + int rcls = fpclassify (__real__ x); + int icls = fpclassify (__imag__ x); + + __real__ x = fabs (__real__ x); + + if (icls >= FP_ZERO) + { + /* Imaginary part is finite. */ + if (rcls >= FP_ZERO) + { + /* Real part is finite. */ + double sinh_val = __ieee754_sinh (__imag__ x); + double cosh_val = __ieee754_cosh (__imag__ x); + double sinix, cosix; + + __sincos (__real__ x, &sinix, &cosix); + + __real__ retval = cosh_val * sinix; + __imag__ retval = sinh_val * cosix; + + if (negate) + __real__ retval = -__real__ retval; + } + else + { + if (icls == FP_ZERO) + { + /* Imaginary part is 0.0. */ + __real__ retval = __nan (""); + __imag__ retval = __imag__ x; + +#ifdef FE_INVALID + if (rcls == FP_INFINITE) + feraiseexcept (FE_INVALID); +#endif + } + else + { + __real__ retval = __nan (""); + __imag__ retval = __nan (""); + +#ifdef FE_INVALID + feraiseexcept (FE_INVALID); +#endif + } + } + } + else if (icls == FP_INFINITE) + { + /* Imaginary part is infinite. */ + if (rcls == FP_ZERO) + { + /* Real part is 0.0. */ + __real__ retval = __copysign (0.0, negate ? -1.0 : 1.0); + __imag__ retval = __imag__ x; + } + else if (rcls > FP_ZERO) + { + /* Real part is finite. */ + double sinix, cosix; + + __sincos (__real__ x, &sinix, &cosix); + + __real__ retval = __copysign (HUGE_VAL, sinix); + __imag__ retval = __copysign (HUGE_VAL, cosix); + + if (negate) + __real__ retval = -__real__ retval; + if (signbit (__imag__ x)) + __imag__ retval = -__imag__ retval; + } + else + { + /* The addition raises the invalid exception. */ + __real__ retval = __nan (""); + __imag__ retval = HUGE_VAL; + +#ifdef FE_INVALID + if (rcls == FP_INFINITE) + feraiseexcept (FE_INVALID); +#endif + } + } + else + { + if (rcls == FP_ZERO) + __real__ retval = __copysign (0.0, negate ? -1.0 : 1.0); + else + __real__ retval = __nan (""); + __imag__ retval = __nan (""); + } + + return retval; +} +weak_alias (__csin, csin) +#ifdef NO_LONG_DOUBLE +strong_alias (__csin, __csinl) +weak_alias (__csin, csinl) +#endif -- cgit v1.2.3