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  * $FreeBSD: src/lib/msun/src/w_y1.c,v 1.3 1999/08/28 00:07:10 peter Exp $
  13  * $DragonFly: src/lib/msun/src/Attic/w_y1.c,v 1.2 2003/06/17 04:26:53 dillon Exp $
  14  */
  15
  16 /*
  17  * wrapper of y1
  18  */
  19
  20 #include "math.h"
  21 #include "math_private.h"
  22
  23 #ifdef __STDC__
  24         double y1(double x)             /* wrapper y1 */
  25 #else
  26         double y1(x)                    /* wrapper y1 */
  27         double x;
  28 #endif
  29 {
  30 #ifdef _IEEE_LIBM
  31         return __ieee754_y1(x);
  32 #else
  33         double z;
  34         z = __ieee754_y1(x);
  35         if(_LIB_VERSION == _IEEE_ || isnan(x) ) return z;
  36         if(x <= 0.0){
  37                 if(x==0.0)
  38                     /* d= -one/(x-x); */
  39                     return __kernel_standard(x,x,10);
  40                 else
  41                     /* d = zero/(x-x); */
  42                     return __kernel_standard(x,x,11);
  43         }
  44         if(x>X_TLOSS) {
  45                 return __kernel_standard(x,x,37); /* y1(x>X_TLOSS) */
  46         } else
  47             return z;
  48 #endif
  49 }