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[glibc/history.git] / math / w_log2l.c
blobb1d8706f2ab86449830bedb71155f18cfa8ff14b
1 /*
2 * wrapper log2l(X)
3 */
5 #include <math.h>
6 #include "math_private.h"
8 long double
9 __log2l (long double x) /* wrapper log2l */
11 #ifdef _IEEE_LIBM
12 return __ieee754_log2l (x);
13 #else
14 long double z;
15 z = __ieee754_log2l (x);
16 if (_LIB_VERSION == _IEEE_ || __isnanl (x)) return z;
17 if (x <= 0.0)
19 if (x == 0.0)
20 return __kernel_standard (x, x, 248); /* log2l (0) */
21 else
22 return __kernel_standard (x, x, 249); /* log2l (x < 0) */
24 else
25 return z;
26 #endif
28 weak_alias (__log2l, log2l)