//===========================================================================
|
//===========================================================================
|
//
|
//
|
// s_ceil.c
|
// s_ceil.c
|
//
|
//
|
// Part of the standard mathematical function library
|
// Part of the standard mathematical function library
|
//
|
//
|
//===========================================================================
|
//===========================================================================
|
//####ECOSGPLCOPYRIGHTBEGIN####
|
//####ECOSGPLCOPYRIGHTBEGIN####
|
// -------------------------------------------
|
// -------------------------------------------
|
// This file is part of eCos, the Embedded Configurable Operating System.
|
// This file is part of eCos, the Embedded Configurable Operating System.
|
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
|
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
|
//
|
//
|
// eCos is free software; you can redistribute it and/or modify it under
|
// eCos is free software; you can redistribute it and/or modify it under
|
// the terms of the GNU General Public License as published by the Free
|
// the terms of the GNU General Public License as published by the Free
|
// Software Foundation; either version 2 or (at your option) any later version.
|
// Software Foundation; either version 2 or (at your option) any later version.
|
//
|
//
|
// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
|
// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
|
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
// for more details.
|
// for more details.
|
//
|
//
|
// You should have received a copy of the GNU General Public License along
|
// You should have received a copy of the GNU General Public License along
|
// with eCos; if not, write to the Free Software Foundation, Inc.,
|
// with eCos; if not, write to the Free Software Foundation, Inc.,
|
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
|
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
|
//
|
//
|
// As a special exception, if other files instantiate templates or use macros
|
// As a special exception, if other files instantiate templates or use macros
|
// or inline functions from this file, or you compile this file and link it
|
// or inline functions from this file, or you compile this file and link it
|
// with other works to produce a work based on this file, this file does not
|
// with other works to produce a work based on this file, this file does not
|
// by itself cause the resulting work to be covered by the GNU General Public
|
// by itself cause the resulting work to be covered by the GNU General Public
|
// License. However the source code for this file must still be made available
|
// License. However the source code for this file must still be made available
|
// in accordance with section (3) of the GNU General Public License.
|
// in accordance with section (3) of the GNU General Public License.
|
//
|
//
|
// This exception does not invalidate any other reasons why a work based on
|
// This exception does not invalidate any other reasons why a work based on
|
// this file might be covered by the GNU General Public License.
|
// this file might be covered by the GNU General Public License.
|
//
|
//
|
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
|
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
|
// at http://sources.redhat.com/ecos/ecos-license/
|
// at http://sources.redhat.com/ecos/ecos-license/
|
// -------------------------------------------
|
// -------------------------------------------
|
//####ECOSGPLCOPYRIGHTEND####
|
//####ECOSGPLCOPYRIGHTEND####
|
//===========================================================================
|
//===========================================================================
|
//#####DESCRIPTIONBEGIN####
|
//#####DESCRIPTIONBEGIN####
|
//
|
//
|
// Author(s): jlarmour
|
// Author(s): jlarmour
|
// Contributors: jlarmour
|
// Contributors: jlarmour
|
// Date: 1998-02-13
|
// Date: 1998-02-13
|
// Purpose:
|
// Purpose:
|
// Description:
|
// Description:
|
// Usage:
|
// Usage:
|
//
|
//
|
//####DESCRIPTIONEND####
|
//####DESCRIPTIONEND####
|
//
|
//
|
//===========================================================================
|
//===========================================================================
|
|
|
// CONFIGURATION
|
// CONFIGURATION
|
|
|
#include <pkgconf/libm.h> // Configuration header
|
#include <pkgconf/libm.h> // Configuration header
|
|
|
// Include the Math library?
|
// Include the Math library?
|
#ifdef CYGPKG_LIBM
|
#ifdef CYGPKG_LIBM
|
|
|
// Derived from code with the following copyright
|
// Derived from code with the following copyright
|
|
|
|
|
/* @(#)s_ceil.c 1.3 95/01/18 */
|
/* @(#)s_ceil.c 1.3 95/01/18 */
|
/*
|
/*
|
* ====================================================
|
* ====================================================
|
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
|
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
|
*
|
*
|
* Developed at SunSoft, a Sun Microsystems, Inc. business.
|
* Developed at SunSoft, a Sun Microsystems, Inc. business.
|
* Permission to use, copy, modify, and distribute this
|
* Permission to use, copy, modify, and distribute this
|
* software is freely granted, provided that this notice
|
* software is freely granted, provided that this notice
|
* is preserved.
|
* is preserved.
|
* ====================================================
|
* ====================================================
|
*/
|
*/
|
|
|
/*
|
/*
|
* ceil(x)
|
* ceil(x)
|
* Return x rounded toward +inf to integral value
|
* Return x rounded toward +inf to integral value
|
* Method:
|
* Method:
|
* Bit twiddling.
|
* Bit twiddling.
|
* Exception:
|
* Exception:
|
* Inexact flag raised if x not equal to ceil(x).
|
* Inexact flag raised if x not equal to ceil(x).
|
*/
|
*/
|
|
|
#include "mathincl/fdlibm.h"
|
#include "mathincl/fdlibm.h"
|
|
|
static const double huge = 1.0e300;
|
static const double huge = 1.0e300;
|
|
|
double ceil(double x)
|
double ceil(double x)
|
{
|
{
|
int i0,i1,j0;
|
int i0,i1,j0;
|
unsigned i,j;
|
unsigned i,j;
|
i0 = CYG_LIBM_HI(x);
|
i0 = CYG_LIBM_HI(x);
|
i1 = CYG_LIBM_LO(x);
|
i1 = CYG_LIBM_LO(x);
|
j0 = ((i0>>20)&0x7ff)-0x3ff;
|
j0 = ((i0>>20)&0x7ff)-0x3ff;
|
if(j0<20) {
|
if(j0<20) {
|
if(j0<0) { /* raise inexact if x != 0 */
|
if(j0<0) { /* raise inexact if x != 0 */
|
if(huge+x>0.0) {/* return 0*sign(x) if |x|<1 */
|
if(huge+x>0.0) {/* return 0*sign(x) if |x|<1 */
|
if(i0<0) {i0=0x80000000;i1=0;}
|
if(i0<0) {i0=0x80000000;i1=0;}
|
else if((i0|i1)!=0) { i0=0x3ff00000;i1=0;}
|
else if((i0|i1)!=0) { i0=0x3ff00000;i1=0;}
|
}
|
}
|
} else {
|
} else {
|
i = (0x000fffff)>>j0;
|
i = (0x000fffff)>>j0;
|
if(((i0&i)|i1)==0) return x; /* x is integral */
|
if(((i0&i)|i1)==0) return x; /* x is integral */
|
if(huge+x>0.0) { /* raise inexact flag */
|
if(huge+x>0.0) { /* raise inexact flag */
|
if(i0>0) i0 += (0x00100000)>>j0;
|
if(i0>0) i0 += (0x00100000)>>j0;
|
i0 &= (~i); i1=0;
|
i0 &= (~i); i1=0;
|
}
|
}
|
}
|
}
|
} else if (j0>51) {
|
} else if (j0>51) {
|
if(j0==0x400) return x+x; /* inf or NaN */
|
if(j0==0x400) return x+x; /* inf or NaN */
|
else return x; /* x is integral */
|
else return x; /* x is integral */
|
} else {
|
} else {
|
i = ((unsigned)(0xffffffff))>>(j0-20);
|
i = ((unsigned)(0xffffffff))>>(j0-20);
|
if((i1&i)==0) return x; /* x is integral */
|
if((i1&i)==0) return x; /* x is integral */
|
if(huge+x>0.0) { /* raise inexact flag */
|
if(huge+x>0.0) { /* raise inexact flag */
|
if(i0>0) {
|
if(i0>0) {
|
if(j0==20) i0+=1;
|
if(j0==20) i0+=1;
|
else {
|
else {
|
j = i1 + (1<<(52-j0));
|
j = i1 + (1<<(52-j0));
|
if(j<(unsigned)i1) i0+=1; /* got a carry */
|
if(j<(unsigned)i1) i0+=1; /* got a carry */
|
i1 = j;
|
i1 = j;
|
}
|
}
|
}
|
}
|
i1 &= (~i);
|
i1 &= (~i);
|
}
|
}
|
}
|
}
|
CYG_LIBM_HI(x) = i0;
|
CYG_LIBM_HI(x) = i0;
|
CYG_LIBM_LO(x) = i1;
|
CYG_LIBM_LO(x) = i1;
|
return x;
|
return x;
|
}
|
}
|
|
|
#endif // ifdef CYGPKG_LIBM
|
#endif // ifdef CYGPKG_LIBM
|
|
|
// EOF s_ceil.c
|
// EOF s_ceil.c
|
|
|