lib/libm/src/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 #include <sys/cdefs.h>
  14 #if defined(LIBM_SCCS) && !defined(lint)
  15 __RCSID("$NetBSD: w_j0.c,v 1.9 2002/05/26 22:02:01 wiz Exp $");
  16 #endif
  17
  18 /*
  19  * wrapper j0(double x), y0(double x)
  20  */
  21
  22 #include "math.h"
  23 #include "math_private.h"
  24
  25 double
  26 j0(double x)            /* wrapper j0 */
  27 {
  28 #ifdef _IEEE_LIBM
  29         return __ieee754_j0(x);
  30 #else
  31         double z = __ieee754_j0(x);
  32         if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
  33         if(fabs(x)>X_TLOSS) {
  34                 return __kernel_standard(x,x,34); /* j0(|x|>X_TLOSS) */
  35         } else
  36             return z;
  37 #endif
  38 }
  39
  40 double
  41 y0(double x)            /* wrapper y0 */
  42 {
  43 #ifdef _IEEE_LIBM
  44         return __ieee754_y0(x);
  45 #else
  46         double z;
  47         z = __ieee754_y0(x);
  48         if(_LIB_VERSION == _IEEE_ || isnan(x) ) return z;
  49         if(x <= 0.0){
  50                 if(x==0.0)
  51                     /* d= -one/(x-x); */
  52                     return __kernel_standard(x,x,8);
  53                 else
  54                     /* d = zero/(x-x); */
  55                     return __kernel_standard(x,x,9);
  56         }
  57         if(x>X_TLOSS) {
  58                 return __kernel_standard(x,x,35); /* y0(x>X_TLOSS) */
  59         } else
  60             return z;
  61 #endif
  62 }