s_floor.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_floor.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.
* ====================================================
*/
/*
* floor(x)
* Return x rounded toward -inf to integral value
* Method:
* Bit twiddling.
* Exception:
* Inexact flag raised if x not equal to floor(x).
*/
#include "fdlibm.h"
#ifdef __STDC__
static const double really_big = 1.0e300;
#else
static double really_big = 1.0e300;
#endif
#ifdef __STDC__
double fd_floor(double x)
#else
double fd_floor(x)
double x;
#endif
{
fd_twoints u;
unsigned i,j;
u.d = x;
if(j0<20) {
if(j0<0) { /* raise inexact if x != 0 */
}
} else {
i = (0x000fffff)>>j0;
}
}
} else if (j0>51) {
else return x; /* x is integral */
} else {
if((i1&i)==0) return x; /* x is integral */
if(i0<0) {
else {
i1=j;
}
}
i1 &= (~i);
}
}
u.d = x;
x = u.d;
return x;
}