1/*
2 * wrapper exp2l(x)
3 */
4
5#include <math.h>
6#include <math_private.h>
7#include <math-svid-compat.h>
8#include <libm-alias-ldouble.h>
9
10#if LIBM_SVID_COMPAT
11long double
12__exp2l (long double x)
13{
14 long double z = __ieee754_exp2l (x);
15 if (__builtin_expect (!isfinite (z) || z == 0, 0)
16 && isfinite (x) && _LIB_VERSION != _IEEE_)
17 /* exp2 overflow: 244, exp2 underflow: 245 */
18 return __kernel_standard_l (x, x, 244 + !!signbit (x));
19
20 return z;
21}
22libm_alias_ldouble (__exp2, exp2)
23#endif
24

source code of glibc/math/w_exp2l_compat.c