diff options
Diffstat (limited to 'sysdeps/x86')
| -rw-r--r-- | sysdeps/x86/fpu/s_isnanl.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/sysdeps/x86/fpu/s_isnanl.c b/sysdeps/x86/fpu/s_isnanl.c new file mode 100644 index 0000000000..45541df08a --- /dev/null +++ b/sysdeps/x86/fpu/s_isnanl.c @@ -0,0 +1,45 @@ +/* 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> + +int __isnanl(long double x) +{ + int32_t se,hx,lx,pn; + GET_LDOUBLE_WORDS(se,hx,lx,x); + se = (se & 0x7fff) << 1; + /* Detect pseudo-normal numbers, i.e. exponent is non-zero and the top + bit of the significand is not set. */ + pn = (uint32_t)((~hx & 0x80000000) & (se|(-se)))>>31; + /* Clear the significand bit when computing mantissa. */ + lx |= hx & 0x7fffffff; + se |= (uint32_t)(lx|(-lx))>>31; + se = 0xfffe - se; + + return (int)(((uint32_t)(se)) >> 16) | pn; +} +hidden_def (__isnanl) +weak_alias (__isnanl, isnanl) |