s_ilogb.c revision 6b15695578f07a3f72c4c9475c1a261a3021472a
/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* The Original Code is Mozilla Communicator client code, released
* March 31, 1998.
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/* @(#)s_ilogb.c 1.3 95/01/18 */
/*
* ====================================================
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
*
* Developed at SunSoft, 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) = 0x80000001
*/
#include "fdlibm.h"
#ifdef __STDC__
int fd_ilogb(double x)
#else
int fd_ilogb(x)
double x;
#endif
{
fd_twoints u;
u.d = x;
if(hx<0x00100000) {
return 0x80000001; /* ilogb(0) = 0x80000001 */
else /* subnormal x */
if(hx==0) {
} else {
}
return ix;
}
else return 0x7fffffff;
}