compiler/mlib/w_ynf.c

   1 /* w_ynf.c -- float version of w_yn.c.
   2  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
   3  */
   4
   5 /*
   6  * ====================================================
   7  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   8  *
   9  * Developed at SunPro, a Sun Microsystems, Inc. business.
  10  * Permission to use, copy, modify, and distribute this
  11  * software is freely granted, provided that this notice
  12  * is preserved.
  13  * ====================================================
  14  */
  15
  16 #ifndef lint
  17 static char rcsid[] = "$FreeBSD: src/lib/msun/src/w_ynf.c,v 1.3 1999/08/28 00:07:11 peter Exp $";
  18 #endif
  19
  20 #include "math.h"
  21 #include "math_private.h"
  22
  23 #ifdef __STDC__
  24         float ynf(int n, float x)       /* wrapper ynf */
  25 #else
  26         float ynf(n,x)                  /* wrapper ynf */
  27         float x; int n;
  28 #endif
  29 {
  30 #ifdef _IEEE_LIBM
  31         return __ieee754_ynf(n,x);
  32 #else
  33         float z;
  34         z = __ieee754_ynf(n,x);
  35         if(_LIB_VERSION == _IEEE_ || isnanf(x) ) return z;
  36         if(x <= (float)0.0){
  37                 if(x==(float)0.0)
  38                     /* d= -one/(x-x); */
  39                     return (float)__kernel_standard((double)n,(double)x,112);
  40                 else
  41                     /* d = zero/(x-x); */
  42                     return (float)__kernel_standard((double)n,(double)x,113);
  43         }
  44         if(x>(float)X_TLOSS) {
  45             /* yn(x>X_TLOSS,n) */
  46             return (float)__kernel_standard((double)n,(double)x,139);
  47         } else
  48             return z;
  49 #endif
  50 }