| author | Rich Felker <dalias@aerifal.cx> | 2012年03月13日 01:17:53 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2012年03月13日 01:17:53 -0400 |
| commit | b69f695acedd4ce2798ef9ea28d834ceccc789bd (patch) | |
| tree | eafd98b9b75160210f3295ac074d699f863d958e /src/math/scalbf.c | |
| parent | d46cf2e14cc4df7cc75e77d7009fcb6df1f48a33 (diff) | |
| download | musl-b69f695acedd4ce2798ef9ea28d834ceccc789bd.tar.gz | |
| -rw-r--r-- | src/math/scalbf.c | 31 |
diff --git a/src/math/scalbf.c b/src/math/scalbf.c new file mode 100644 index 00000000..0cc091f1 --- /dev/null +++ b/src/math/scalbf.c @@ -0,0 +1,31 @@ +/* origin: FreeBSD /usr/src/lib/msun/src/e_scalbf.c */ +/* + * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. + */ +/* + * ==================================================== + * 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. + * ==================================================== + */ + +#include "libm.h" + +float scalbf(float x, float fn) +{ + if (isnan(x) || isnan(fn)) return x*fn; + if (!isfinite(fn)) { + if (fn > (float)0.0) + return x*fn; + else + return x/(-fn); + } + if (rintf(fn) != fn) return (fn-fn)/(fn-fn); + if ( fn > (float)65000.0) return scalbnf(x, 65000); + if (-fn > (float)65000.0) return scalbnf(x,-65000); + return scalbnf(x,(int)fn); +} |