diff options
Diffstat (limited to 'sysdeps/libm-i387/s_isnanl.c')
| -rw-r--r-- | sysdeps/libm-i387/s_isnanl.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/sysdeps/libm-i387/s_isnanl.c b/sysdeps/libm-i387/s_isnanl.c new file mode 100644 index 0000000..768ea21 --- /dev/null +++ b/sysdeps/libm-i387/s_isnanl.c @@ -0,0 +1,46 @@ +/* s_isnanl.c -- long double version for i387 of s_isnan.c. + * Conversion to long double by Ulrich Drepper, + * Cygnus Support, drepper@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: $"; +#endif + +/* + * isnanl(x) returns 1 is x is nan, else 0; + * no branching! + */ + +#include "math.h" +#include "math_private.h" + +#ifdef __STDC__ + int __isnanl(long double x) +#else + int __isnanl(x) + long double x; +#endif +{ + int32_t se,hx,lx; + GET_LDOUBLE_WORDS(se,hx,lx,x); + se = (se & 0x7fff) << 1; + lx |= hx; + /* The additional &hx is required because Intel's extended format + has the normally implicit 1 explicit present. Sigh! */ + se |= (u_int32_t)((lx|(-lx))&hx)>>31; + se = 0xfffe - se; + return (int)((u_int32_t)(se))>>16; +} +weak_alias (__isnanl, isnanl) |