lib/libm/src/w_acoshf.c

   1 /* w_acoshf.c -- float version of w_acosh.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
  17 #include <sys/cdefs.h>
  18 #if defined(LIBM_SCCS) && !defined(lint)
  19 __RCSID("$NetBSD: w_acoshf.c,v 1.5 1999/07/02 15:37:43 simonb Exp $");
  20 #endif
  21
  22 /*
  23  * wrapper acoshf(x)
  24  */
  25
  26 #include "math.h"
  27 #include "math_private.h"
  28
  29 float
  30 acoshf(float x)         /* wrapper acoshf */
  31 {
  32 #ifdef _IEEE_LIBM
  33         return __ieee754_acoshf(x);
  34 #else
  35         float z;
  36         z = __ieee754_acoshf(x);
  37         if(_LIB_VERSION == _IEEE_ || isnanf(x)) return z;
  38         if(x<(float)1.0) {
  39                 /* acosh(x<1) */
  40                 return (float)__kernel_standard((double)x,(double)x,129);
  41         } else
  42             return z;
  43 #endif
  44 }