1 /* Complex sine hyperbole function for double. 2 Copyright (C) 1997 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. 5 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. 10 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. 15 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 19 02111-1307 USA. */ 20 21 #include <complex.h> 22 #include <fenv.h> 23 #include <math.h> 24 25 #include "math_private.h" 26 27 28 __complex__ double 29 __csinh (__complex__ double x) 30 { 31 __complex__ double retval; 32 int negate = signbit (__real__ x); 33 int rcls = fpclassify (__real__ x); 34 int icls = fpclassify (__imag__ x); 35 36 __real__ x = fabs (__real__ x); 37 38 if (rcls >= FP_ZERO) 39 { 40 /* Real part is finite. */ 41 if (icls >= FP_ZERO) 42 { 43 /* Imaginary part is finite. */ 44 double sinh_val = __ieee754_sinh (__real__ x); 45 double cosh_val = __ieee754_cosh (__real__ x); 46 double sinix, cosix; 47 48 __sincos (__imag__ x, &sinix, &cosix); 49 50 __real__ retval = sinh_val * cosix; 51 __imag__ retval = cosh_val * sinix; 52 53 if (negate) 54 __real__ retval = -__real__ retval; 55 } 56 else 57 { 58 if (rcls == FP_ZERO) 59 { 60 /* Real part is 0.0. */ 61 __real__ retval = __copysign (0.0, negate ? -1.0 : 1.0); 62 __imag__ retval = __nan ("") + __nan (""); 63 64 #ifdef FE_INVALID 65 if (icls == FP_INFINITE) 66 feraiseexcept (FE_INVALID); 67 #endif 68 } 69 else 70 { 71 __real__ retval = __nan (""); 72 __imag__ retval = __nan (""); 73 74 #ifdef FE_INVALID 75 feraiseexcept (FE_INVALID); 76 #endif 77 } 78 } 79 } 80 else if (rcls == FP_INFINITE) 81 { 82 /* Real part is infinite. */ 83 if (icls == FP_ZERO) 84 { 85 /* Imaginary part is 0.0. */ 86 __real__ retval = negate ? -HUGE_VAL : HUGE_VAL; 87 __imag__ retval = __imag__ x; 88 } 89 else if (icls > FP_ZERO) 90 { 91 /* Imaginary part is finite. */ 92 double sinix, cosix; 93 94 __sincos (__imag__ x, &sinix, &cosix); 95 96 __real__ retval = __copysign (HUGE_VAL, cosix); 97 __imag__ retval = __copysign (HUGE_VAL, sinix); 98 99 if (negate) 100 __real__ retval = -__real__ retval; 101 } 102 else 103 { 104 /* The addition raises the invalid exception. */ 105 __real__ retval = HUGE_VAL; 106 __imag__ retval = __nan ("") + __nan (""); 107 108 #ifdef FE_INVALID 109 if (icls == FP_INFINITE) 110 feraiseexcept (FE_INVALID); 111 #endif 112 } 113 } 114 else 115 { 116 __real__ retval = __nan (""); 117 __imag__ retval = __imag__ x == 0.0 ? __imag__ x : __nan (""); 118 } 119 120 return retval; 121 } 122 weak_alias (__csinh, csinh) 123 #ifdef NO_LONG_DOUBLE 124 strong_alias (__csinh, __csinhl) 125 weak_alias (__csinh, csinhl) 126 #endif 127