diff options
Diffstat (limited to 'src/math/s_logb.c')
-rw-r--r-- | src/math/s_logb.c | 34 |
1 files changed, 0 insertions, 34 deletions
diff --git a/src/math/s_logb.c b/src/math/s_logb.c deleted file mode 100644 index be399c77..00000000 --- a/src/math/s_logb.c +++ /dev/null @@ -1,34 +0,0 @@ -/* @(#)s_logb.c 5.1 93/09/24 */ -/* - * ==================================================== - * 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. - * ==================================================== - */ - -/* - * double logb(x) - * IEEE 754 logb. Included to pass IEEE test suite. Not recommend. - * Use ilogb instead. - */ - -#include <math.h> -#include "math_private.h" - -double -logb(double x) -{ - int32_t lx,ix; - EXTRACT_WORDS(ix,lx,x); - ix &= 0x7fffffff; /* high |x| */ - if((ix|lx)==0) return -1.0/fabs(x); - if(ix>=0x7ff00000) return x*x; - if((ix>>=20)==0) /* IEEE 754 logb */ - return -1022.0; - else - return (double) (ix-1023); -} |