math/w_cosh_compat.c

   1 /* Optimizations by Ulrich Drepper <drepper@gmail.com>, 2011 */
   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 /*
  14  * wrapper cosh(x)
  15  */
  16
  17 #include <math.h>
  18 #include <math_private.h>
  19 #include <math-svid-compat.h>
  20 #include <libm-alias-double.h>
  21
  22 #if LIBM_SVID_COMPAT
  23 double
  24 __cosh (double x)
  25 {
  26         double z = __ieee754_cosh (x);
  27         if (__builtin_expect (!isfinite (z), 0) && isfinite (x)
  28             && _LIB_VERSION != _IEEE_)
  29                 return __kernel_standard (x, x, 5); /* cosh overflow */
  30
  31         return z;
  32 }
  33 libm_alias_double (__cosh, cosh)
  34 #endif