compiler/mlib/w_log10f.c

   1 /* w_log10f.c -- float version of w_log10.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_log10f.c,v 1.5 1999/08/28 00:07:06 peter Exp $";
  18 #endif
  19
  20 /*
  21  * wrapper log10f(X)
  22  */
  23
  24 #include "math.h"
  25 #include "math_private.h"
  26
  27
  28 float
  29 log10f(float x)         /* wrapper log10f */
  30 {
  31 #ifdef _IEEE_LIBM
  32         return __ieee754_log10f(x);
  33 #else
  34         float z;
  35         z = __ieee754_log10f(x);
  36         if(_LIB_VERSION == _IEEE_ || isnanf(x)) return z;
  37         if(x<=(float)0.0) {
  38             if(x==(float)0.0)
  39                 /* log10(0) */
  40                 return (float)__kernel_standard((double)x,(double)x,118);
  41             else
  42                 /* log10(x<0) */
  43                 return (float)__kernel_standard((double)x,(double)x,119);
  44         } else
  45             return z;
  46 #endif
  47 }