271 lines
7.1 KiB
C
271 lines
7.1 KiB
C
/* $NetBSD: frnd.c,v 1.1 2002/06/05 01:04:25 fredette Exp $ */
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/* $OpenBSD: frnd.c,v 1.5 2001/03/29 03:58:18 mickey Exp $ */
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/*
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* Copyright 1996 1995 by Open Software Foundation, Inc.
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* All Rights Reserved
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby granted,
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* provided that the above copyright notice appears in all copies and
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* that both the copyright notice and this permission notice appear in
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* supporting documentation.
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*
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* OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE.
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*
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* IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
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* NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
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* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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*/
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/*
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* pmk1.1
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*/
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/*
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* (c) Copyright 1986 HEWLETT-PACKARD COMPANY
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*
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* To anyone who acknowledges that this file is provided "AS IS"
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* without any express or implied warranty:
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* permission to use, copy, modify, and distribute this file
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* for any purpose is hereby granted without fee, provided that
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* the above copyright notice and this notice appears in all
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* copies, and that the name of Hewlett-Packard Company not be
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* used in advertising or publicity pertaining to distribution
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* of the software without specific, written prior permission.
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* Hewlett-Packard Company makes no representations about the
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* suitability of this software for any purpose.
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*/
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#include "../spmath/float.h"
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#include "../spmath/sgl_float.h"
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#include "../spmath/dbl_float.h"
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#include "../spmath/quad_float.h"
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#include "../spmath/cnv_float.h"
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/*
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* Single Floating-point Round to Integer
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*/
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/*ARGSUSED*/
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int
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sgl_frnd(srcptr,dstptr,status)
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sgl_floating_point *srcptr, *dstptr;
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unsigned int *status;
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{
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register unsigned int src, result;
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register int src_exponent;
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register int inexact = FALSE;
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src = *srcptr;
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/*
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* check source operand for NaN or infinity
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*/
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if ((src_exponent = Sgl_exponent(src)) == SGL_INFINITY_EXPONENT) {
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/*
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* is signaling NaN?
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*/
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if (Sgl_isone_signaling(src)) {
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/* trap if INVALIDTRAP enabled */
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if (Is_invalidtrap_enabled()) return(INVALIDEXCEPTION);
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/* make NaN quiet */
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Set_invalidflag();
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Sgl_set_quiet(src);
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}
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/*
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* return quiet NaN or infinity
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*/
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*dstptr = src;
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return(NOEXCEPTION);
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}
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/*
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* Need to round?
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*/
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if ((src_exponent -= SGL_BIAS) >= SGL_P - 1) {
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*dstptr = src;
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return(NOEXCEPTION);
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}
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/*
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* Generate result
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*/
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if (src_exponent >= 0) {
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Sgl_clear_exponent_set_hidden(src);
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result = src;
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Sgl_rightshift(result,(SGL_P-1) - (src_exponent));
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/* check for inexact */
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if (Sgl_isinexact_to_fix(src,src_exponent)) {
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inexact = TRUE;
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/* round result */
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switch (Rounding_mode()) {
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case ROUNDPLUS:
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if (Sgl_iszero_sign(src)) Sgl_increment(result);
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break;
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case ROUNDMINUS:
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if (Sgl_isone_sign(src)) Sgl_increment(result);
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break;
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case ROUNDNEAREST:
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if (Sgl_isone_roundbit(src,src_exponent))
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if (Sgl_isone_stickybit(src,src_exponent)
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|| (Sgl_isone_lowmantissa(result)))
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Sgl_increment(result);
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}
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}
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Sgl_leftshift(result,(SGL_P-1) - (src_exponent));
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if (Sgl_isone_hiddenoverflow(result))
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Sgl_set_exponent(result,src_exponent + (SGL_BIAS+1));
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else Sgl_set_exponent(result,src_exponent + SGL_BIAS);
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}
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else {
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result = src; /* set sign */
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Sgl_setzero_exponentmantissa(result);
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/* check for inexact */
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if (Sgl_isnotzero_exponentmantissa(src)) {
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inexact = TRUE;
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/* round result */
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switch (Rounding_mode()) {
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case ROUNDPLUS:
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if (Sgl_iszero_sign(src))
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Sgl_set_exponent(result,SGL_BIAS);
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break;
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case ROUNDMINUS:
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if (Sgl_isone_sign(src))
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Sgl_set_exponent(result,SGL_BIAS);
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break;
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case ROUNDNEAREST:
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if (src_exponent == -1)
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if (Sgl_isnotzero_mantissa(src))
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Sgl_set_exponent(result,SGL_BIAS);
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}
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}
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}
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*dstptr = result;
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if (inexact) {
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if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
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else Set_inexactflag();
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}
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return(NOEXCEPTION);
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}
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/*
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* Double Floating-point Round to Integer
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*/
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/*ARGSUSED*/
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int
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dbl_frnd(srcptr,dstptr,status)
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dbl_floating_point *srcptr, *dstptr;
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unsigned int *status;
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{
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register unsigned int srcp1, srcp2, resultp1, resultp2;
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register int src_exponent;
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register int inexact = FALSE;
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Dbl_copyfromptr(srcptr,srcp1,srcp2);
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/*
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* check source operand for NaN or infinity
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*/
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if ((src_exponent = Dbl_exponent(srcp1)) == DBL_INFINITY_EXPONENT) {
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/*
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* is signaling NaN?
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*/
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if (Dbl_isone_signaling(srcp1)) {
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/* trap if INVALIDTRAP enabled */
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if (Is_invalidtrap_enabled()) return(INVALIDEXCEPTION);
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/* make NaN quiet */
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Set_invalidflag();
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Dbl_set_quiet(srcp1);
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}
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/*
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* return quiet NaN or infinity
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*/
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Dbl_copytoptr(srcp1,srcp2,dstptr);
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return(NOEXCEPTION);
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}
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/*
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* Need to round?
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*/
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if ((src_exponent -= DBL_BIAS) >= DBL_P - 1) {
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Dbl_copytoptr(srcp1,srcp2,dstptr);
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return(NOEXCEPTION);
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}
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/*
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* Generate result
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*/
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if (src_exponent >= 0) {
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Dbl_clear_exponent_set_hidden(srcp1);
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resultp1 = srcp1;
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resultp2 = srcp2;
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Dbl_rightshift(resultp1,resultp2,(DBL_P-1) - (src_exponent));
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/* check for inexact */
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if (Dbl_isinexact_to_fix(srcp1,srcp2,src_exponent)) {
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inexact = TRUE;
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/* round result */
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switch (Rounding_mode()) {
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case ROUNDPLUS:
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if (Dbl_iszero_sign(srcp1))
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Dbl_increment(resultp1,resultp2);
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break;
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case ROUNDMINUS:
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if (Dbl_isone_sign(srcp1))
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Dbl_increment(resultp1,resultp2);
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break;
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case ROUNDNEAREST:
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if (Dbl_isone_roundbit(srcp1,srcp2,src_exponent))
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if (Dbl_isone_stickybit(srcp1,srcp2,src_exponent)
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|| (Dbl_isone_lowmantissap2(resultp2)))
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Dbl_increment(resultp1,resultp2);
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}
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}
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Dbl_leftshift(resultp1,resultp2,(DBL_P-1) - (src_exponent));
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if (Dbl_isone_hiddenoverflow(resultp1))
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Dbl_set_exponent(resultp1,src_exponent + (DBL_BIAS+1));
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else Dbl_set_exponent(resultp1,src_exponent + DBL_BIAS);
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}
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else {
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resultp1 = srcp1; /* set sign */
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Dbl_setzero_exponentmantissa(resultp1,resultp2);
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/* check for inexact */
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if (Dbl_isnotzero_exponentmantissa(srcp1,srcp2)) {
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inexact = TRUE;
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/* round result */
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switch (Rounding_mode()) {
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case ROUNDPLUS:
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if (Dbl_iszero_sign(srcp1))
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Dbl_set_exponent(resultp1,DBL_BIAS);
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break;
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case ROUNDMINUS:
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if (Dbl_isone_sign(srcp1))
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Dbl_set_exponent(resultp1,DBL_BIAS);
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break;
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case ROUNDNEAREST:
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if (src_exponent == -1)
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if (Dbl_isnotzero_mantissa(srcp1,srcp2))
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Dbl_set_exponent(resultp1,DBL_BIAS);
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}
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}
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}
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Dbl_copytoptr(resultp1,resultp2,dstptr);
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if (inexact) {
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if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
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else Set_inexactflag();
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}
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return(NOEXCEPTION);
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}
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/*ARGSUSED*/
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int
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quad_frnd(srcptr,dstptr,status)
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quad_floating_point *srcptr, *dstptr;
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unsigned int *status;
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{
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return(UNIMPLEMENTEDEXCEPTION);
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}
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