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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libm/] [common/] [sf_log2.c] - Rev 859
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/* 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) */
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