text: /* Compute 2^x.
     Copyright (C) 2012-2018 Free Software Foundation, Inc.
     This file is part of the GNU C Library.
  
     The GNU C Library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public
     License as published by the Free Software Foundation; either
     version 2.1 of the License, or (at your option) any later version.
  
     The GNU C Library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Lesser General Public License for more details.
  
     You should have received a copy of the GNU Lesser General Public
     License along with the GNU C Library; if not, see
     <http://www.gnu.org/licenses/>.  */
  
  #include <math.h>
  #include <math_private.h>
  #include <math-underflow.h>
  #include <float.h>
  
  FLOAT
  M_DECL_FUNC (__ieee754_exp2) (FLOAT x)
  {
    if (__glibc_likely (isless (x, (FLOAT) M_MAX_EXP)))
      {
        if (__builtin_expect (isgreaterequal (x, (FLOAT) (M_MIN_EXP - M_MANT_DIG
  							- 1)), 1))
  	{
  	  int intx = (int) x;
  	  FLOAT fractx = x - intx;
  	  FLOAT result;
  	  if (M_FABS (fractx) < M_EPSILON / 4)
  	    result = M_SCALBN (1 + fractx, intx);
  	  else
  	    result = M_SCALBN (M_EXP (M_MLIT (M_LN2) * fractx), intx);
  	  math_check_force_underflow_nonneg (result);
  	  return result;
  	}
        else
  	{
  	  /* Underflow or exact zero.  */
  	  if (isinf (x))
  	    return 0;
  	  else
  	    return M_MIN * M_MIN;
  	}
      }
    else
      /* Infinity, NaN or overflow.  */
      return M_MAX * x;
  }
  declare_mgen_finite_alias (__ieee754_exp2, __exp2)
  