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Diffstat (limited to 'libm/src/w_log.c')
-rw-r--r-- | libm/src/w_log.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/libm/src/w_log.c b/libm/src/w_log.c new file mode 100644 index 0000000..0eb8f0b --- /dev/null +++ b/libm/src/w_log.c @@ -0,0 +1,39 @@ + +/* @(#)w_log.c 1.3 95/01/18 */ +/* + * ==================================================== + * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. + * + * Developed at SunSoft, a Sun Microsystems, Inc. business. + * Permission to use, copy, modify, and distribute this + * software is freely granted, provided that this notice + * is preserved. + * ==================================================== + */ + +/* + * wrapper log(x) + */ + +#include "fdlibm.h" + + +#ifdef __STDC__ + double log(double x) /* wrapper log */ +#else + double log(x) /* wrapper log */ + double x; +#endif +{ +#ifdef _IEEE_LIBM + return __ieee754_log(x); +#else + double z; + z = __ieee754_log(x); + if(_LIB_VERSION == _IEEE_ || isnan(x) || x > 0.0) return z; + if(x==0.0) + return __kernel_standard(x,x,16); /* log(0) */ + else + return __kernel_standard(x,x,17); /* log(x<0) */ +#endif +} |