| /* sf_log2.c -- float version of s_log2.c. |
| * Modification of sf_exp10.c by Yaakov Selkowitz 2009. |
| */ |
| |
| /* |
| * ==================================================== |
| * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
| * |
| * Developed at SunPro, a Sun Microsystems, Inc. business. |
| * Permission to use, copy, modify, and distribute this |
| * software is freely granted, provided that this notice |
| * is preserved. |
| * ==================================================== |
| */ |
| |
| /* |
| * wrapper log2f(x) |
| */ |
| |
| #include "fdlibm.h" |
| #include <errno.h> |
| #include <math.h> |
| #undef log2 |
| #undef log2f |
| |
| #ifdef __STDC__ |
| float log2f(float x) /* wrapper log2f */ |
| #else |
| float log2f(x) /* wrapper log2f */ |
| float x; |
| #endif |
| { |
| return (logf(x) / (float) M_LOG2_E); |
| } |
| |
| #ifdef _DOUBLE_IS_32BITS |
| |
| #ifdef __STDC__ |
| double log2(double x) |
| #else |
| double log2(x) |
| double x; |
| #endif |
| { |
| return (double) log2f((float) x); |
| } |
| |
| #endif /* defined(_DOUBLE_IS_32BITS) */ |