1 /* Return value of complex exponential function for long double complex value. 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__ long double 29 __cexpl (__complex__ long double x) 30 { 31 __complex__ long double retval; 32 int rcls = fpclassify (__real__ x); 33 int icls = fpclassify (__imag__ x); 34 35 if (rcls >= FP_ZERO) 36 { 37 /* Real part is finite. */ 38 if (icls >= FP_ZERO) 39 { 40 /* Imaginary part is finite. */ 41 long double exp_val = expl (__real__ x); 42 long double sinix, cosix; 43 44 sincosl (__imag__ x, &sinix, &cosix); 45 46 if (isfinite (exp_val)) 47 { 48 __real__ retval = exp_val * cosix; 49 __imag__ retval = exp_val * sinix; 50 } 51 else 52 { 53 __real__ retval = copysignl (exp_val, cosix); 54 __imag__ retval = copysignl (exp_val, sinix); 55 } 56 } 57 else 58 { 59 /* If the imaginary part is +-inf or NaN and the real part 60 is not +-inf the result is NaN + iNaN. */ 61 __real__ retval = nanl (""); 62 __imag__ retval = nanl (""); 63 64 #ifdef FE_INVALID 65 feraiseexcept (FE_INVALID); 66 #endif 67 } 68 } 69 else if (rcls == FP_INFINITE) 70 { 71 /* Real part is infinite. */ 72 if (icls >= FP_ZERO) 73 { 74 /* Imaginary part is finite. */ 75 long double value = signbit (__real__ x) ? 0.0 : HUGE_VALL; 76 77 if (icls == FP_ZERO) 78 { 79 /* Imaginary part is 0.0. */ 80 __real__ retval = value; 81 __imag__ retval = __imag__ x; 82 } 83 else 84 { 85 long double sinix, cosix; 86 87 sincosl (__imag__ x, &sinix, &cosix); 88 89 __real__ retval = copysignl (value, cosix); 90 __imag__ retval = copysignl (value, sinix); 91 } 92 } 93 else if (signbit (__real__ x) == 0) 94 { 95 __real__ retval = HUGE_VALL; 96 __imag__ retval = nanl (""); 97 98 #ifdef FE_INVALID 99 if (icls == FP_INFINITE) 100 feraiseexcept (FE_INVALID); 101 #endif 102 } 103 else 104 { 105 __real__ retval = 0.0; 106 __imag__ retval = copysignl (0.0, __imag__ x); 107 } 108 } 109 else 110 { 111 /* If the real part is NaN the result is NaN + iNaN. */ 112 __real__ retval = nanl (""); 113 __imag__ retval = nanl (""); 114 115 #ifdef FE_INVALID 116 if (rcls != FP_NAN || icls != FP_NAN) 117 feraiseexcept (FE_INVALID); 118 #endif 119 } 120 121 return retval; 122 } 123 weak_alias (__cexpl, cexpl) 124