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Diffstat (limited to 'libm/s_isnanf.c')
| -rw-r--r-- | libm/s_isnanf.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/libm/s_isnanf.c b/libm/s_isnanf.c new file mode 100644 index 000000000..fa2d2fe89 --- /dev/null +++ b/libm/s_isnanf.c @@ -0,0 +1,43 @@ +/* s_isnanf.c -- float version of s_isnan.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. + * ==================================================== + */ + +#if defined(LIBM_SCCS) && !defined(lint) +static char rcsid[] = "$NetBSD: s_isnanf.c,v 1.4 1995/05/10 20:47:38 jtc Exp $"; +#endif + +/* + * isnanf(x) returns 1 is x is nan, else 0; + * no branching! + */ + +#include "math.h" +#include "math_private.h" + +libm_hidden_proto (__isnanf) +#ifdef __STDC__ + int __isnanf(float x) +#else + int __isnanf(x) + float x; +#endif +{ + int32_t ix; + GET_FLOAT_WORD(ix,x); + ix &= 0x7fffffff; + ix = 0x7f800000 - ix; + return (int)(((u_int32_t)(ix))>>31); +} +libm_hidden_def (__isnanf) +weak_alias (__isnanf, isnanf) |