diff options
Diffstat (limited to 'newlib/libm/common/sf_log2.c')
-rw-r--r-- | newlib/libm/common/sf_log2.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/newlib/libm/common/sf_log2.c b/newlib/libm/common/sf_log2.c new file mode 100644 index 000000000..eb8863c9f --- /dev/null +++ b/newlib/libm/common/sf_log2.c @@ -0,0 +1,48 @@ +/* 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) */ |