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/* s_ilogbl.c -- long double version of s_ilogb.c.
* Conversion to 128-bit long double by Mark Kettenis, kettenis@openbsd.org.
*/
/*
* ====================================================
* 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.
* ====================================================
*/
/* ilogbl(long 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 <float.h>
#include <math.h>
#include "math_private.h"
int
ilogbl(long double x)
{
int64_t hx,lx;
int32_t ix;
GET_LDOUBLE_WORDS64(hx,lx,x);
hx &= 0x7fffffffffffffffLL;
if(hx<0x0001000000000000LL) {
if((hx|lx)==0)
return FP_ILOGB0; /* ilogb(0) = FP_ILOGB0 */
else /* subnormal x */
if(hx==0) {
for (ix = -16431; lx>0; lx<<=1) ix -=1;
} else {
for (ix = -16382, hx<<=15; hx>0; hx<<=1) ix -=1;
}
return ix;
}
else if (hx<0x7fff000000000000LL) return (hx>>48)-16383;
else if (hx>0x7fff000000000000LL || lx!=0) return FP_ILOGBNAN;
else return INT_MAX;
}
DEF_STD(ilogbl);
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