lib/msun/src/w_y1.c

   1 /* from: @(#)w_j1.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 #ifndef lint
  14 static char rcsid[] = "$FreeBSD: src/lib/msun/src/w_y1.c,v 1.3 1999/08/28 00:07:10 peter Exp $";
  15 #endif
  16
  17 /*
  18  * wrapper of y1
  19  */
  20
  21 #include "math.h"
  22 #include "math_private.h"
  23
  24 #ifdef __STDC__
  25         double y1(double x)             /* wrapper y1 */
  26 #else
  27         double y1(x)                    /* wrapper y1 */
  28         double x;
  29 #endif
  30 {
  31 #ifdef _IEEE_LIBM
  32         return __ieee754_y1(x);
  33 #else
  34         double z;
  35         z = __ieee754_y1(x);
  36         if(_LIB_VERSION == _IEEE_ || isnan(x) ) return z;
  37         if(x <= 0.0){
  38                 if(x==0.0)
  39                     /* d= -one/(x-x); */
  40                     return __kernel_standard(x,x,10);
  41                 else
  42                     /* d = zero/(x-x); */
  43                     return __kernel_standard(x,x,11);
  44         }
  45         if(x>X_TLOSS) {
  46                 return __kernel_standard(x,x,37); /* y1(x>X_TLOSS) */
  47         } else
  48             return z;
  49 #endif
  50 }