diff options
Diffstat (limited to 'sysdeps/libm-ieee754/s_logbl.c')
| -rw-r--r-- | sysdeps/libm-ieee754/s_logbl.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/sysdeps/libm-ieee754/s_logbl.c b/sysdeps/libm-ieee754/s_logbl.c new file mode 100644 index 0000000000..2cd9d105f8 --- /dev/null +++ b/sysdeps/libm-ieee754/s_logbl.c @@ -0,0 +1,47 @@ +/* s_logbl.c -- long double version of s_logb.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 + +/* + * long double logbl(x) + * IEEE 754 logb. Included to pass IEEE test suite. Not recommend. + * Use ilogb instead. + */ + +#include "math.h" +#include "math_private.h" + +#ifdef __STDC__ + long double __logbl(long double x) +#else + long double __logbl(x) + long double x; +#endif +{ + int32_t es,lx,ix; + GET_LDOUBLE_WORDS(es,ix,lx,x); + es &= 0x7fff; /* exponent */ + if((es|ix|lx)==0) return -1.0/fabs(x); + if(es==0x7fff) return x*x; + if(es==0) /* IEEE 754 logb */ + return -16382.0; + else + return (long double) (es-0x3fff); +} +weak_alias (__logbl, logbl) |