first commit of the new libm!

[musl] / src / math / s_ilogb.c

diff --git a/src/math/s_ilogb.c b/src/math/s_ilogb.c
deleted file mode 100644 (file)
index f1ac498..0000000
--- 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;
-}