libquadmath/math/ldexpq.c

   1 /* s_ldexpl.c -- long double version of s_ldexp.c.
   2  * Conversion to long double by Ulrich Drepper,
   3  * Cygnus Support, drepper@cygnus.com.
   4  */
   5
   6 /*
   7  * ====================================================
   8  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   9  *
  10  * Developed at SunPro, a Sun Microsystems, Inc. business.
  11  * Permission to use, copy, modify, and distribute this
  12  * software is freely granted, provided that this notice
  13  * is preserved.
  14  * ====================================================
  15  */
  16
  17 #include <errno.h>
  18 #include "quadmath-imp.h"
  19
  20 __float128
  21 ldexpq (__float128 value, int exp)
  22 {
  23   if(!finiteq(value)||value==0.0Q) return value;
  24   value = scalbnq(value,exp);
  25   if(!finiteq(value)||value==0.0Q) errno = ERANGE;
  26   return value;
  27 }