1 | /* |
---|---|
2 | * wrapper exp2(x) |
3 | */ |
4 | |
5 | #include <math.h> |
6 | #include <math_private.h> |
7 | #include <math-svid-compat.h> |
8 | #include <libm-alias-double.h> |
9 | |
10 | #if LIBM_SVID_COMPAT |
11 | double |
12 | __exp2 (double x) |
13 | { |
14 | double z = __ieee754_exp2 (x); |
15 | if (__builtin_expect (!isfinite (z) || z == 0, 0) |
16 | && isfinite (x) && _LIB_VERSION != _IEEE_) |
17 | /* exp2 overflow: 44, exp2 underflow: 45 */ |
18 | return __kernel_standard (x, x, 44 + !!signbit (x)); |
19 | |
20 | return z; |
21 | } |
22 | libm_alias_double (__exp2, exp2) |
23 | #endif |
24 |