/* 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 <drepper@cygnus.com>, 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 <complex.h> #include <fenv.h> #include <math.h> #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