274 lines
7.2 KiB
C
274 lines
7.2 KiB
C
/* $NetBSD: frnd.c,v 1.4 2007/02/22 05:46:30 thorpej Exp $ */
|
|
|
|
/* $OpenBSD: frnd.c,v 1.5 2001/03/29 03:58:18 mickey Exp $ */
|
|
|
|
/*
|
|
* Copyright 1996 1995 by Open Software Foundation, Inc.
|
|
* All Rights Reserved
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software and
|
|
* its documentation for any purpose and without fee is hereby granted,
|
|
* provided that the above copyright notice appears in all copies and
|
|
* that both the copyright notice and this permission notice appear in
|
|
* supporting documentation.
|
|
*
|
|
* OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
|
|
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE.
|
|
*
|
|
* IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
|
|
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
|
|
* LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
|
|
* NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
|
|
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*
|
|
*/
|
|
/*
|
|
* pmk1.1
|
|
*/
|
|
/*
|
|
* (c) Copyright 1986 HEWLETT-PACKARD COMPANY
|
|
*
|
|
* To anyone who acknowledges that this file is provided "AS IS"
|
|
* without any express or implied warranty:
|
|
* permission to use, copy, modify, and distribute this file
|
|
* for any purpose is hereby granted without fee, provided that
|
|
* the above copyright notice and this notice appears in all
|
|
* copies, and that the name of Hewlett-Packard Company not be
|
|
* used in advertising or publicity pertaining to distribution
|
|
* of the software without specific, written prior permission.
|
|
* Hewlett-Packard Company makes no representations about the
|
|
* suitability of this software for any purpose.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: frnd.c,v 1.4 2007/02/22 05:46:30 thorpej Exp $");
|
|
|
|
#include "../spmath/float.h"
|
|
#include "../spmath/sgl_float.h"
|
|
#include "../spmath/dbl_float.h"
|
|
#include "../spmath/quad_float.h"
|
|
#include "../spmath/cnv_float.h"
|
|
|
|
/*
|
|
* Single Floating-point Round to Integer
|
|
*/
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
sgl_frnd(srcptr,dstptr,status)
|
|
|
|
sgl_floating_point *srcptr, *dstptr;
|
|
unsigned int *status;
|
|
{
|
|
register unsigned int src, result;
|
|
register int src_exponent;
|
|
register int inexact = false;
|
|
|
|
src = *srcptr;
|
|
/*
|
|
* check source operand for NaN or infinity
|
|
*/
|
|
if ((src_exponent = Sgl_exponent(src)) == SGL_INFINITY_EXPONENT) {
|
|
/*
|
|
* is signaling NaN?
|
|
*/
|
|
if (Sgl_isone_signaling(src)) {
|
|
/* trap if INVALIDTRAP enabled */
|
|
if (Is_invalidtrap_enabled()) return(INVALIDEXCEPTION);
|
|
/* make NaN quiet */
|
|
Set_invalidflag();
|
|
Sgl_set_quiet(src);
|
|
}
|
|
/*
|
|
* return quiet NaN or infinity
|
|
*/
|
|
*dstptr = src;
|
|
return(NOEXCEPTION);
|
|
}
|
|
/*
|
|
* Need to round?
|
|
*/
|
|
if ((src_exponent -= SGL_BIAS) >= SGL_P - 1) {
|
|
*dstptr = src;
|
|
return(NOEXCEPTION);
|
|
}
|
|
/*
|
|
* Generate result
|
|
*/
|
|
if (src_exponent >= 0) {
|
|
Sgl_clear_exponent_set_hidden(src);
|
|
result = src;
|
|
Sgl_rightshift(result,(SGL_P-1) - (src_exponent));
|
|
/* check for inexact */
|
|
if (Sgl_isinexact_to_fix(src,src_exponent)) {
|
|
inexact = true;
|
|
/* round result */
|
|
switch (Rounding_mode()) {
|
|
case ROUNDPLUS:
|
|
if (Sgl_iszero_sign(src)) Sgl_increment(result);
|
|
break;
|
|
case ROUNDMINUS:
|
|
if (Sgl_isone_sign(src)) Sgl_increment(result);
|
|
break;
|
|
case ROUNDNEAREST:
|
|
if (Sgl_isone_roundbit(src,src_exponent))
|
|
if (Sgl_isone_stickybit(src,src_exponent)
|
|
|| (Sgl_isone_lowmantissa(result)))
|
|
Sgl_increment(result);
|
|
}
|
|
}
|
|
Sgl_leftshift(result,(SGL_P-1) - (src_exponent));
|
|
if (Sgl_isone_hiddenoverflow(result))
|
|
Sgl_set_exponent(result,src_exponent + (SGL_BIAS+1));
|
|
else Sgl_set_exponent(result,src_exponent + SGL_BIAS);
|
|
}
|
|
else {
|
|
result = src; /* set sign */
|
|
Sgl_setzero_exponentmantissa(result);
|
|
/* check for inexact */
|
|
if (Sgl_isnotzero_exponentmantissa(src)) {
|
|
inexact = true;
|
|
/* round result */
|
|
switch (Rounding_mode()) {
|
|
case ROUNDPLUS:
|
|
if (Sgl_iszero_sign(src))
|
|
Sgl_set_exponent(result,SGL_BIAS);
|
|
break;
|
|
case ROUNDMINUS:
|
|
if (Sgl_isone_sign(src))
|
|
Sgl_set_exponent(result,SGL_BIAS);
|
|
break;
|
|
case ROUNDNEAREST:
|
|
if (src_exponent == -1)
|
|
if (Sgl_isnotzero_mantissa(src))
|
|
Sgl_set_exponent(result,SGL_BIAS);
|
|
}
|
|
}
|
|
}
|
|
*dstptr = result;
|
|
if (inexact) {
|
|
if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
|
|
else Set_inexactflag();
|
|
}
|
|
return(NOEXCEPTION);
|
|
}
|
|
|
|
/*
|
|
* Double Floating-point Round to Integer
|
|
*/
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
dbl_frnd(srcptr,dstptr,status)
|
|
|
|
dbl_floating_point *srcptr, *dstptr;
|
|
unsigned int *status;
|
|
{
|
|
register unsigned int srcp1, srcp2, resultp1, resultp2;
|
|
register int src_exponent;
|
|
register int inexact = false;
|
|
|
|
Dbl_copyfromptr(srcptr,srcp1,srcp2);
|
|
/*
|
|
* check source operand for NaN or infinity
|
|
*/
|
|
if ((src_exponent = Dbl_exponent(srcp1)) == DBL_INFINITY_EXPONENT) {
|
|
/*
|
|
* is signaling NaN?
|
|
*/
|
|
if (Dbl_isone_signaling(srcp1)) {
|
|
/* trap if INVALIDTRAP enabled */
|
|
if (Is_invalidtrap_enabled()) return(INVALIDEXCEPTION);
|
|
/* make NaN quiet */
|
|
Set_invalidflag();
|
|
Dbl_set_quiet(srcp1);
|
|
}
|
|
/*
|
|
* return quiet NaN or infinity
|
|
*/
|
|
Dbl_copytoptr(srcp1,srcp2,dstptr);
|
|
return(NOEXCEPTION);
|
|
}
|
|
/*
|
|
* Need to round?
|
|
*/
|
|
if ((src_exponent -= DBL_BIAS) >= DBL_P - 1) {
|
|
Dbl_copytoptr(srcp1,srcp2,dstptr);
|
|
return(NOEXCEPTION);
|
|
}
|
|
/*
|
|
* Generate result
|
|
*/
|
|
if (src_exponent >= 0) {
|
|
Dbl_clear_exponent_set_hidden(srcp1);
|
|
resultp1 = srcp1;
|
|
resultp2 = srcp2;
|
|
Dbl_rightshift(resultp1,resultp2,(DBL_P-1) - (src_exponent));
|
|
/* check for inexact */
|
|
if (Dbl_isinexact_to_fix(srcp1,srcp2,src_exponent)) {
|
|
inexact = true;
|
|
/* round result */
|
|
switch (Rounding_mode()) {
|
|
case ROUNDPLUS:
|
|
if (Dbl_iszero_sign(srcp1))
|
|
Dbl_increment(resultp1,resultp2);
|
|
break;
|
|
case ROUNDMINUS:
|
|
if (Dbl_isone_sign(srcp1))
|
|
Dbl_increment(resultp1,resultp2);
|
|
break;
|
|
case ROUNDNEAREST:
|
|
if (Dbl_isone_roundbit(srcp1,srcp2,src_exponent))
|
|
if (Dbl_isone_stickybit(srcp1,srcp2,src_exponent)
|
|
|| (Dbl_isone_lowmantissap2(resultp2)))
|
|
Dbl_increment(resultp1,resultp2);
|
|
}
|
|
}
|
|
Dbl_leftshift(resultp1,resultp2,(DBL_P-1) - (src_exponent));
|
|
if (Dbl_isone_hiddenoverflow(resultp1))
|
|
Dbl_set_exponent(resultp1,src_exponent + (DBL_BIAS+1));
|
|
else Dbl_set_exponent(resultp1,src_exponent + DBL_BIAS);
|
|
}
|
|
else {
|
|
resultp1 = srcp1; /* set sign */
|
|
Dbl_setzero_exponentmantissa(resultp1,resultp2);
|
|
/* check for inexact */
|
|
if (Dbl_isnotzero_exponentmantissa(srcp1,srcp2)) {
|
|
inexact = true;
|
|
/* round result */
|
|
switch (Rounding_mode()) {
|
|
case ROUNDPLUS:
|
|
if (Dbl_iszero_sign(srcp1))
|
|
Dbl_set_exponent(resultp1,DBL_BIAS);
|
|
break;
|
|
case ROUNDMINUS:
|
|
if (Dbl_isone_sign(srcp1))
|
|
Dbl_set_exponent(resultp1,DBL_BIAS);
|
|
break;
|
|
case ROUNDNEAREST:
|
|
if (src_exponent == -1)
|
|
if (Dbl_isnotzero_mantissa(srcp1,srcp2))
|
|
Dbl_set_exponent(resultp1,DBL_BIAS);
|
|
}
|
|
}
|
|
}
|
|
Dbl_copytoptr(resultp1,resultp2,dstptr);
|
|
if (inexact) {
|
|
if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
|
|
else Set_inexactflag();
|
|
}
|
|
return(NOEXCEPTION);
|
|
}
|
|
|
|
/*ARGSUSED*/
|
|
int
|
|
quad_frnd(srcptr,dstptr,status)
|
|
|
|
quad_floating_point *srcptr, *dstptr;
|
|
unsigned int *status;
|
|
{
|
|
return(UNIMPLEMENTEDEXCEPTION);
|
|
}
|
|
|