diff options
| author |   deraadt <deraadt@openbsd.org> | 1995-10-18 08:37:01 +0000 |
|---|---|---|
| committer | deraadt <deraadt@openbsd.org> | 1995-10-18 08:37:01 +0000 |
| commit | df930be708d50e9715f173caa26ffe1b7599b157 (patch) | |
| tree | aa317e49e28cb999c9cf3db7f00c20903fe6010a /lib/libm/src/s_logbf.c | |
| download | wireguard-openbsd-df930be708d50e9715f173caa26ffe1b7599b157.tar.xz wireguard-openbsd-df930be708d50e9715f173caa26ffe1b7599b157.zip | |
initial import of NetBSD tree
Diffstat (limited to 'lib/libm/src/s_logbf.c')
| -rw-r--r-- | lib/libm/src/s_logbf.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/lib/libm/src/s_logbf.c b/lib/libm/src/s_logbf.c new file mode 100644 index 00000000000..b6c5028ae72 --- /dev/null +++ b/lib/libm/src/s_logbf.c @@ -0,0 +1,39 @@ +/* s_logbf.c -- float version of s_logb.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_logbf.c,v 1.4 1995/05/10 20:47:51 jtc Exp $"; +#endif + +#include "math.h" +#include "math_private.h" + +#ifdef __STDC__ + float logbf(float x) +#else + float logbf(x) + float x; +#endif +{ + int32_t ix; + GET_FLOAT_WORD(ix,x); + ix &= 0x7fffffff; /* high |x| */ + if(ix==0) return (float)-1.0/fabsf(x); + if(ix>=0x7f800000) return x*x; + if((ix>>=23)==0) /* IEEE 754 logb */ + return -126.0; + else + return (float) (ix-127); +} |