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Diffstat (limited to 'lib/msun/src/s_finite.c')
-rw-r--r-- | lib/msun/src/s_finite.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/lib/msun/src/s_finite.c b/lib/msun/src/s_finite.c new file mode 100644 index 000000000000..02fe3077f1c5 --- /dev/null +++ b/lib/msun/src/s_finite.c @@ -0,0 +1,41 @@ +/* @(#)s_finite.c 5.1 93/09/24 */ +/* + * ==================================================== + * 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. + * ==================================================== + */ + +#ifndef lint +static char rcsid[] = "$Id: s_finite.c,v 1.1.1.1 1994/05/06 00:20:04 gclarkii Exp $"; +#endif + +/* + * finite(x) returns 1 is x is finite, else 0; + * no branching! + */ + +#include "math.h" +#include <machine/endian.h> + +#if BYTE_ORDER == LITTLE_ENDIAN +#define n0 1 +#else +#define n0 0 +#endif + +#ifdef __STDC__ + int finite(double x) +#else + int finite(x) + double x; +#endif +{ + int hx; + hx = *(n0+(int*)&x); + return (unsigned)((hx&0x7fffffff)-0x7ff00000)>>31; +} |