| Current Path : /usr/src/lib/msun/src/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //usr/src/lib/msun/src/s_ilogbf.c |
/* 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.
* ====================================================
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/lib/msun/src/s_ilogbf.c 176451 2008-02-22 02:30:36Z das $");
#include <limits.h>
#include "math.h"
#include "math_private.h"
int ilogbf(float x)
{
int32_t hx,ix;
GET_FLOAT_WORD(hx,x);
hx &= 0x7fffffff;
if(hx<0x00800000) {
if(hx==0)
return FP_ILOGB0;
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 if (hx>0x7f800000) return FP_ILOGBNAN;
else return INT_MAX;
}