475 lines
12 KiB
C
475 lines
12 KiB
C
/* $NetBSD: fcnvfx.c,v 1.1 2002/06/05 01:04:25 fredette Exp $ */
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/* $OpenBSD: fcnvfx.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/cnv_float.h"
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/*
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* Single Floating-point to Single Fixed-point
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*/
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/*ARGSUSED*/
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int
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sgl_to_sgl_fcnvfx(srcptr,dstptr,status)
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sgl_floating_point *srcptr;
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int *dstptr;
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unsigned int *status;
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{
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register unsigned int src, temp;
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register int src_exponent, result;
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register int inexact = FALSE;
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src = *srcptr;
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src_exponent = Sgl_exponent(src) - SGL_BIAS;
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/*
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* Test for overflow
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*/
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if (src_exponent > SGL_FX_MAX_EXP) {
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/* check for MININT */
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if ((src_exponent > SGL_FX_MAX_EXP + 1) ||
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Sgl_isnotzero_mantissa(src) || Sgl_iszero_sign(src)) {
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/*
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* Since source is a number which cannot be
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* represented in fixed-point format, return
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* largest (or smallest) fixed-point number.
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*/
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Sgl_return_overflow(src,dstptr);
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}
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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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temp = src;
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Sgl_clear_signexponent_set_hidden(temp);
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Int_from_sgl_mantissa(temp,src_exponent);
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if (Sgl_isone_sign(src)) result = -Sgl_all(temp);
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else result = Sgl_all(temp);
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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)) result++;
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break;
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case ROUNDMINUS:
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if (Sgl_isone_sign(src)) 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(temp))) {
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if (Sgl_iszero_sign(src)) result++;
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else result--;
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}
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}
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}
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}
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}
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else {
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result = 0;
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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)) result++;
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break;
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case ROUNDMINUS:
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if (Sgl_isone_sign(src)) result--;
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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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if (Sgl_iszero_sign(src)) result++;
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else result--;
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}
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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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* Single Floating-point to Double Fixed-point
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*/
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/*ARGSUSED*/
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int
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sgl_to_dbl_fcnvfx(srcptr,dstptr,status)
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sgl_floating_point *srcptr;
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dbl_integer *dstptr;
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unsigned int *status;
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{
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register int src_exponent, resultp1;
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register unsigned int src, temp, resultp2;
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register int inexact = FALSE;
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src = *srcptr;
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src_exponent = Sgl_exponent(src) - SGL_BIAS;
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/*
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* Test for overflow
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*/
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if (src_exponent > DBL_FX_MAX_EXP) {
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/* check for MININT */
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if ((src_exponent > DBL_FX_MAX_EXP + 1) ||
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Sgl_isnotzero_mantissa(src) || Sgl_iszero_sign(src)) {
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/*
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* Since source is a number which cannot be
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* represented in fixed-point format, return
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* largest (or smallest) fixed-point number.
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*/
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Sgl_return_overflow_dbl(src,dstptr);
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}
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Dint_set_minint(resultp1,resultp2);
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Dint_copytoptr(resultp1,resultp2,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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temp = src;
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Sgl_clear_signexponent_set_hidden(temp);
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Dint_from_sgl_mantissa(temp,src_exponent,resultp1,resultp2);
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if (Sgl_isone_sign(src)) {
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Dint_setone_sign(resultp1,resultp2);
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}
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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)) {
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Dint_increment(resultp1,resultp2);
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}
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break;
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case ROUNDMINUS:
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if (Sgl_isone_sign(src)) {
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Dint_decrement(resultp1,resultp2);
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}
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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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(Dint_isone_lowp2(resultp2))) {
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if (Sgl_iszero_sign(src)) {
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Dint_increment(resultp1,resultp2);
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}
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else {
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Dint_decrement(resultp1,resultp2);
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}
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}
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}
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}
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}
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else {
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Dint_setzero(resultp1,resultp2);
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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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Dint_increment(resultp1,resultp2);
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}
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break;
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case ROUNDMINUS:
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if (Sgl_isone_sign(src)) {
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Dint_decrement(resultp1,resultp2);
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}
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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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if (Sgl_iszero_sign(src)) {
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Dint_increment(resultp1,resultp2);
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}
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else {
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Dint_decrement(resultp1,resultp2);
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}
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}
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}
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}
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}
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Dint_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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/*
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* Double Floating-point to Single Fixed-point
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*/
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/*ARGSUSED*/
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int
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dbl_to_sgl_fcnvfx(srcptr,dstptr,status)
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dbl_floating_point *srcptr;
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int *dstptr;
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unsigned int *status;
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{
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register unsigned int srcp1,srcp2, tempp1,tempp2;
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register int src_exponent, result;
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register int inexact = FALSE;
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Dbl_copyfromptr(srcptr,srcp1,srcp2);
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src_exponent = Dbl_exponent(srcp1) - DBL_BIAS;
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/*
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* Test for overflow
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*/
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if (src_exponent > SGL_FX_MAX_EXP) {
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/* check for MININT */
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if (Dbl_isoverflow_to_int(src_exponent,srcp1,srcp2)) {
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/*
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* Since source is a number which cannot be
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* represented in fixed-point format, return
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* largest (or smallest) fixed-point number.
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*/
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Dbl_return_overflow(srcp1,srcp2,dstptr);
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}
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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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tempp1 = srcp1;
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tempp2 = srcp2;
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Dbl_clear_signexponent_set_hidden(tempp1);
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Int_from_dbl_mantissa(tempp1,tempp2,src_exponent);
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if (Dbl_isone_sign(srcp1) && (src_exponent <= SGL_FX_MAX_EXP))
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result = -Dbl_allp1(tempp1);
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else result = Dbl_allp1(tempp1);
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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)) result++;
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break;
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case ROUNDMINUS:
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if (Dbl_isone_sign(srcp1)) result--;
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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_lowmantissap1(tempp1))) {
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if (Dbl_iszero_sign(srcp1)) result++;
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else result--;
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}
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}
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/* check for overflow */
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if ((Dbl_iszero_sign(srcp1) && result < 0) ||
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(Dbl_isone_sign(srcp1) && result > 0)) {
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Dbl_return_overflow(srcp1,srcp2,dstptr);
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}
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}
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}
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else {
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result = 0;
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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)) result++;
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break;
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case ROUNDMINUS:
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if (Dbl_isone_sign(srcp1)) result--;
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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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if (Dbl_iszero_sign(srcp1)) result++;
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else result--;
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}
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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 to Double Fixed-point
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*/
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/*ARGSUSED*/
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int
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dbl_to_dbl_fcnvfx(srcptr,dstptr,status)
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dbl_floating_point *srcptr;
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dbl_integer *dstptr;
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unsigned int *status;
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{
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register int src_exponent, resultp1;
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register unsigned int srcp1, srcp2, tempp1, tempp2, resultp2;
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register int inexact = FALSE;
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Dbl_copyfromptr(srcptr,srcp1,srcp2);
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src_exponent = Dbl_exponent(srcp1) - DBL_BIAS;
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/*
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* Test for overflow
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*/
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if (src_exponent > DBL_FX_MAX_EXP) {
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/* check for MININT */
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if ((src_exponent > DBL_FX_MAX_EXP + 1) ||
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Dbl_isnotzero_mantissa(srcp1,srcp2) || Dbl_iszero_sign(srcp1)) {
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/*
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* Since source is a number which cannot be
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* represented in fixed-point format, return
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* largest (or smallest) fixed-point number.
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*/
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Dbl_return_overflow_dbl(srcp1,srcp2,dstptr);
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}
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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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tempp1 = srcp1;
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tempp2 = srcp2;
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Dbl_clear_signexponent_set_hidden(tempp1);
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Dint_from_dbl_mantissa(tempp1,tempp2,src_exponent,
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resultp1, resultp2);
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if (Dbl_isone_sign(srcp1)) {
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Dint_setone_sign(resultp1,resultp2);
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}
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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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Dint_increment(resultp1,resultp2);
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}
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break;
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case ROUNDMINUS:
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if (Dbl_isone_sign(srcp1)) {
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Dint_decrement(resultp1,resultp2);
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}
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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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(Dint_isone_lowp2(resultp2))) {
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if (Dbl_iszero_sign(srcp1)) {
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Dint_increment(resultp1,resultp2);
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}
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else {
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Dint_decrement(resultp1,resultp2);
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}
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}
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}
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}
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}
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else {
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Dint_setzero(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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Dint_increment(resultp1,resultp2);
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}
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break;
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case ROUNDMINUS:
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if (Dbl_isone_sign(srcp1)) {
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Dint_decrement(resultp1,resultp2);
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}
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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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if (Dbl_iszero_sign(srcp1)) {
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Dint_increment(resultp1,resultp2);
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}
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else {
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Dint_decrement(resultp1,resultp2);
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}
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}
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}
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}
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}
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Dint_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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