| /* |
| * wrapper log2(X) |
| */ |
| |
| #include <math.h> |
| #include "math_private.h" |
| |
| double |
| __log2 (double x) /* wrapper log2 */ |
| { |
| #ifdef _IEEE_LIBM |
| return __ieee754_log2 (x); |
| #else |
| double z; |
| z = __ieee754_log2 (x); |
| if (_LIB_VERSION == _IEEE_ || __isnan (x)) return z; |
| if (x <= 0.0) |
| { |
| if (x == 0.0) |
| return __kernel_standard (x, x, 48); /* log2 (0) */ |
| else |
| return __kernel_standard (x, x, 49); /* log2 (x < 0) */ |
| } |
| else |
| return z; |
| #endif |
| } |
| weak_alias (__log2, log2) |
| #ifdef NO_LONG_DOUBLE |
| strong_alias (__log2, __log2l) |
| weak_alias (__log2, log2l) |
| #endif |
