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Diffstat (limited to 'src/math/s_ilogb.c')
-rw-r--r-- | src/math/s_ilogb.c | 45 |
1 files changed, 0 insertions, 45 deletions
diff --git a/src/math/s_ilogb.c b/src/math/s_ilogb.c deleted file mode 100644 index f1ac498a..00000000 --- a/src/math/s_ilogb.c +++ /dev/null @@ -1,45 +0,0 @@ -/* @(#)s_ilogb.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. - * ==================================================== - */ - -/* ilogb(double x) - * return the binary exponent of non-zero x - * ilogb(0) = FP_ILOGB0 - * ilogb(NaN) = FP_ILOGBNAN (no signal is raised) - * ilogb(inf) = INT_MAX (no signal is raised) - */ - -#include <limits.h> - -#include <math.h> -#include "math_private.h" - -int ilogb(double x) -{ - int32_t hx,lx,ix; - - EXTRACT_WORDS(hx,lx,x); - hx &= 0x7fffffff; - if(hx<0x00100000) { - if((hx|lx)==0) - return FP_ILOGB0; - else /* subnormal x */ - if(hx==0) { - for (ix = -1043; lx>0; lx<<=1) ix -=1; - } else { - for (ix = -1022,hx<<=11; hx>0; hx<<=1) ix -=1; - } - return ix; - } - else if (hx<0x7ff00000) return (hx>>20)-1023; - else if (hx>0x7ff00000 || lx!=0) return FP_ILOGBNAN; - else return INT_MAX; -} |