diff options
Diffstat (limited to 'sysdeps/libm-ieee754/s_ilogbf.c')
| -rw-r--r-- | sysdeps/libm-ieee754/s_ilogbf.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/sysdeps/libm-ieee754/s_ilogbf.c b/sysdeps/libm-ieee754/s_ilogbf.c new file mode 100644 index 0000000000..2440803c20 --- /dev/null +++ b/sysdeps/libm-ieee754/s_ilogbf.c @@ -0,0 +1,44 @@ +/* s_ilogbf.c -- float version of s_ilogb.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_ilogbf.c,v 1.4 1995/05/10 20:47:31 jtc Exp $"; +#endif + +#include "math.h" +#include "math_private.h" + +#ifdef __STDC__ + int __ilogbf(float x) +#else + int __ilogbf(x) + float x; +#endif +{ + int32_t hx,ix; + + GET_FLOAT_WORD(hx,x); + hx &= 0x7fffffff; + if(hx<0x00800000) { + if(hx==0) + return 0x80000001; /* ilogb(0) = 0x80000001 */ + else /* subnormal x */ + for (ix = -126,hx<<=8; hx>0; hx<<=1) ix -=1; + return ix; + } + else if (hx<0x7f800000) return (hx>>23)-127; + else return 0x7fffffff; +} +weak_alias (__ilogbf, ilogbf) |