libm/w_j0.c

   1 /* @(#)w_j0.c 5.1 93/09/24 */
   2 /*
   3  * ====================================================
   4  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   5  *
   6  * Developed at SunPro, a Sun Microsystems, Inc. business.
   7  * Permission to use, copy, modify, and distribute this
   8  * software is freely granted, provided that this notice
   9  * is preserved.
  10  * ====================================================
  11  */
  12
  13 #if defined(LIBM_SCCS) && !defined(lint)
  14 static char rcsid[] = "$NetBSD: w_j0.c,v 1.6 1995/05/10 20:49:11 jtc Exp $";
  15 #endif
  16
  17 /*
  18  * wrapper j0(double x), y0(double x)
  19  */
  20
  21 #include "math.h"
  22 #include "math_private.h"
  23
  24 #ifdef __STDC__
  25         double j0(double x)             /* wrapper j0 */
  26 #else
  27         double j0(x)                    /* wrapper j0 */
  28         double x;
  29 #endif
  30 {
  31 #ifdef _IEEE_LIBM
  32         return __ieee754_j0(x);
  33 #else
  34         double z = __ieee754_j0(x);
  35         if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
  36         if(fabs(x)>X_TLOSS) {
  37                 return __kernel_standard(x,x,34); /* j0(|x|>X_TLOSS) */
  38         } else
  39             return z;
  40 #endif
  41 }
  42
  43 #ifdef __STDC__
  44         double y0(double x)             /* wrapper y0 */
  45 #else
  46         double y0(x)                    /* wrapper y0 */
  47         double x;
  48 #endif
  49 {
  50 #ifdef _IEEE_LIBM
  51         return __ieee754_y0(x);
  52 #else
  53         double z;
  54         z = __ieee754_y0(x);
  55         if(_LIB_VERSION == _IEEE_ || isnan(x) ) return z;
  56         if(x <= 0.0){
  57                 if(x==0.0)
  58                     /* d= -one/(x-x); */
  59                     return __kernel_standard(x,x,8);
  60                 else
  61                     /* d = zero/(x-x); */
  62                     return __kernel_standard(x,x,9);
  63         }
  64         if(x>X_TLOSS) {
  65                 return __kernel_standard(x,x,35); /* y0(x>X_TLOSS) */
  66         } else
  67             return z;
  68 #endif
  69 }