#include <lcmath.h> double _ldexp (double y, int n);
_ldexp calculates y(2**n). It is almost identical to ldexp
but it is faster because no error checking is performed.
_ldexp returns the value of type double that results from the
calculation.
_ldexp generates the SIGFPOFL or SIGFPUFL signal if an error occurs.
_ldexp is not portable.
_ldexp is implemented as a built-in function unless it is undefined by an
#undef statement.
The difference between ldexp and _ldexp is that _ldexp does
not check for erroneous arguments, so an ABEND OCC or OCD occurs if the
arguments are invalid. Because _ldexp avoids error checking, it is
significantly faster than ldexp.
ldexp
Copyright (c) 1998 SAS Institute Inc. Cary, NC, USA. All rights reserved.