forked from Minki/linux
660662f857
Based on 1 normalized pattern(s): this program 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 software foundation either version 2 or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 42 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190524100845.259718220@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
489 lines
14 KiB
C
489 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Linux/PA-RISC Project (http://www.parisc-linux.org/)
|
|
*
|
|
* Floating-point emulation code
|
|
* Copyright (C) 2001 Hewlett-Packard (Paul Bame) <bame@debian.org>
|
|
*/
|
|
/*
|
|
* BEGIN_DESC
|
|
*
|
|
* File:
|
|
* @(#) pa/spmath/fcnvfx.c $Revision: 1.1 $
|
|
*
|
|
* Purpose:
|
|
* Single Floating-point to Single Fixed-point
|
|
* Single Floating-point to Double Fixed-point
|
|
* Double Floating-point to Single Fixed-point
|
|
* Double Floating-point to Double Fixed-point
|
|
*
|
|
* External Interfaces:
|
|
* dbl_to_dbl_fcnvfx(srcptr,nullptr,dstptr,status)
|
|
* dbl_to_sgl_fcnvfx(srcptr,nullptr,dstptr,status)
|
|
* sgl_to_dbl_fcnvfx(srcptr,nullptr,dstptr,status)
|
|
* sgl_to_sgl_fcnvfx(srcptr,nullptr,dstptr,status)
|
|
*
|
|
* Internal Interfaces:
|
|
*
|
|
* Theory:
|
|
* <<please update with a overview of the operation of this file>>
|
|
*
|
|
* END_DESC
|
|
*/
|
|
|
|
|
|
#include "float.h"
|
|
#include "sgl_float.h"
|
|
#include "dbl_float.h"
|
|
#include "cnv_float.h"
|
|
|
|
/*
|
|
* Single Floating-point to Single Fixed-point
|
|
*/
|
|
/*ARGSUSED*/
|
|
int
|
|
sgl_to_sgl_fcnvfx(
|
|
sgl_floating_point *srcptr,
|
|
sgl_floating_point *nullptr,
|
|
int *dstptr,
|
|
sgl_floating_point *status)
|
|
{
|
|
register unsigned int src, temp;
|
|
register int src_exponent, result;
|
|
register boolean inexact = FALSE;
|
|
|
|
src = *srcptr;
|
|
src_exponent = Sgl_exponent(src) - SGL_BIAS;
|
|
|
|
/*
|
|
* Test for overflow
|
|
*/
|
|
if (src_exponent > SGL_FX_MAX_EXP) {
|
|
/* check for MININT */
|
|
if ((src_exponent > SGL_FX_MAX_EXP + 1) ||
|
|
Sgl_isnotzero_mantissa(src) || Sgl_iszero_sign(src)) {
|
|
if (Sgl_iszero_sign(src)) result = 0x7fffffff;
|
|
else result = 0x80000000;
|
|
|
|
if (Is_invalidtrap_enabled()) {
|
|
return(INVALIDEXCEPTION);
|
|
}
|
|
Set_invalidflag();
|
|
*dstptr = result;
|
|
return(NOEXCEPTION);
|
|
}
|
|
}
|
|
/*
|
|
* Generate result
|
|
*/
|
|
if (src_exponent >= 0) {
|
|
temp = src;
|
|
Sgl_clear_signexponent_set_hidden(temp);
|
|
Int_from_sgl_mantissa(temp,src_exponent);
|
|
if (Sgl_isone_sign(src)) result = -Sgl_all(temp);
|
|
else result = Sgl_all(temp);
|
|
|
|
/* 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)) result++;
|
|
break;
|
|
case ROUNDMINUS:
|
|
if (Sgl_isone_sign(src)) result--;
|
|
break;
|
|
case ROUNDNEAREST:
|
|
if (Sgl_isone_roundbit(src,src_exponent)) {
|
|
if (Sgl_isone_stickybit(src,src_exponent)
|
|
|| (Sgl_isone_lowmantissa(temp)))
|
|
if (Sgl_iszero_sign(src)) result++;
|
|
else result--;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
result = 0;
|
|
|
|
/* check for inexact */
|
|
if (Sgl_isnotzero_exponentmantissa(src)) {
|
|
inexact = TRUE;
|
|
/* round result */
|
|
switch (Rounding_mode()) {
|
|
case ROUNDPLUS:
|
|
if (Sgl_iszero_sign(src)) result++;
|
|
break;
|
|
case ROUNDMINUS:
|
|
if (Sgl_isone_sign(src)) result--;
|
|
break;
|
|
case ROUNDNEAREST:
|
|
if (src_exponent == -1)
|
|
if (Sgl_isnotzero_mantissa(src))
|
|
if (Sgl_iszero_sign(src)) result++;
|
|
else result--;
|
|
}
|
|
}
|
|
}
|
|
*dstptr = result;
|
|
if (inexact) {
|
|
if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
|
|
else Set_inexactflag();
|
|
}
|
|
return(NOEXCEPTION);
|
|
}
|
|
|
|
/*
|
|
* Single Floating-point to Double Fixed-point
|
|
*/
|
|
/*ARGSUSED*/
|
|
int
|
|
sgl_to_dbl_fcnvfx(
|
|
sgl_floating_point *srcptr,
|
|
unsigned int *nullptr,
|
|
dbl_integer *dstptr,
|
|
unsigned int *status)
|
|
{
|
|
register int src_exponent, resultp1;
|
|
register unsigned int src, temp, resultp2;
|
|
register boolean inexact = FALSE;
|
|
|
|
src = *srcptr;
|
|
src_exponent = Sgl_exponent(src) - SGL_BIAS;
|
|
|
|
/*
|
|
* Test for overflow
|
|
*/
|
|
if (src_exponent > DBL_FX_MAX_EXP) {
|
|
/* check for MININT */
|
|
if ((src_exponent > DBL_FX_MAX_EXP + 1) ||
|
|
Sgl_isnotzero_mantissa(src) || Sgl_iszero_sign(src)) {
|
|
if (Sgl_iszero_sign(src)) {
|
|
resultp1 = 0x7fffffff;
|
|
resultp2 = 0xffffffff;
|
|
}
|
|
else {
|
|
resultp1 = 0x80000000;
|
|
resultp2 = 0;
|
|
}
|
|
if (Is_invalidtrap_enabled()) {
|
|
return(INVALIDEXCEPTION);
|
|
}
|
|
Set_invalidflag();
|
|
Dint_copytoptr(resultp1,resultp2,dstptr);
|
|
return(NOEXCEPTION);
|
|
}
|
|
Dint_set_minint(resultp1,resultp2);
|
|
Dint_copytoptr(resultp1,resultp2,dstptr);
|
|
return(NOEXCEPTION);
|
|
}
|
|
/*
|
|
* Generate result
|
|
*/
|
|
if (src_exponent >= 0) {
|
|
temp = src;
|
|
Sgl_clear_signexponent_set_hidden(temp);
|
|
Dint_from_sgl_mantissa(temp,src_exponent,resultp1,resultp2);
|
|
if (Sgl_isone_sign(src)) {
|
|
Dint_setone_sign(resultp1,resultp2);
|
|
}
|
|
|
|
/* 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)) {
|
|
Dint_increment(resultp1,resultp2);
|
|
}
|
|
break;
|
|
case ROUNDMINUS:
|
|
if (Sgl_isone_sign(src)) {
|
|
Dint_decrement(resultp1,resultp2);
|
|
}
|
|
break;
|
|
case ROUNDNEAREST:
|
|
if (Sgl_isone_roundbit(src,src_exponent))
|
|
if (Sgl_isone_stickybit(src,src_exponent) ||
|
|
(Dint_isone_lowp2(resultp2)))
|
|
if (Sgl_iszero_sign(src)) {
|
|
Dint_increment(resultp1,resultp2);
|
|
}
|
|
else {
|
|
Dint_decrement(resultp1,resultp2);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
Dint_setzero(resultp1,resultp2);
|
|
|
|
/* check for inexact */
|
|
if (Sgl_isnotzero_exponentmantissa(src)) {
|
|
inexact = TRUE;
|
|
/* round result */
|
|
switch (Rounding_mode()) {
|
|
case ROUNDPLUS:
|
|
if (Sgl_iszero_sign(src)) {
|
|
Dint_increment(resultp1,resultp2);
|
|
}
|
|
break;
|
|
case ROUNDMINUS:
|
|
if (Sgl_isone_sign(src)) {
|
|
Dint_decrement(resultp1,resultp2);
|
|
}
|
|
break;
|
|
case ROUNDNEAREST:
|
|
if (src_exponent == -1)
|
|
if (Sgl_isnotzero_mantissa(src))
|
|
if (Sgl_iszero_sign(src)) {
|
|
Dint_increment(resultp1,resultp2);
|
|
}
|
|
else {
|
|
Dint_decrement(resultp1,resultp2);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
Dint_copytoptr(resultp1,resultp2,dstptr);
|
|
if (inexact) {
|
|
if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
|
|
else Set_inexactflag();
|
|
}
|
|
return(NOEXCEPTION);
|
|
}
|
|
|
|
/*
|
|
* Double Floating-point to Single Fixed-point
|
|
*/
|
|
/*ARGSUSED*/
|
|
int
|
|
dbl_to_sgl_fcnvfx(
|
|
dbl_floating_point *srcptr,
|
|
unsigned int *nullptr,
|
|
int *dstptr,
|
|
unsigned int *status)
|
|
{
|
|
register unsigned int srcp1,srcp2, tempp1,tempp2;
|
|
register int src_exponent, result;
|
|
register boolean inexact = FALSE;
|
|
|
|
Dbl_copyfromptr(srcptr,srcp1,srcp2);
|
|
src_exponent = Dbl_exponent(srcp1) - DBL_BIAS;
|
|
|
|
/*
|
|
* Test for overflow
|
|
*/
|
|
if (src_exponent > SGL_FX_MAX_EXP) {
|
|
/* check for MININT */
|
|
if (Dbl_isoverflow_to_int(src_exponent,srcp1,srcp2)) {
|
|
if (Dbl_iszero_sign(srcp1)) result = 0x7fffffff;
|
|
else result = 0x80000000;
|
|
|
|
if (Is_invalidtrap_enabled()) {
|
|
return(INVALIDEXCEPTION);
|
|
}
|
|
Set_invalidflag();
|
|
*dstptr = result;
|
|
return(NOEXCEPTION);
|
|
}
|
|
}
|
|
/*
|
|
* Generate result
|
|
*/
|
|
if (src_exponent >= 0) {
|
|
tempp1 = srcp1;
|
|
tempp2 = srcp2;
|
|
Dbl_clear_signexponent_set_hidden(tempp1);
|
|
Int_from_dbl_mantissa(tempp1,tempp2,src_exponent);
|
|
if (Dbl_isone_sign(srcp1) && (src_exponent <= SGL_FX_MAX_EXP))
|
|
result = -Dbl_allp1(tempp1);
|
|
else result = Dbl_allp1(tempp1);
|
|
|
|
/* 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)) result++;
|
|
break;
|
|
case ROUNDMINUS:
|
|
if (Dbl_isone_sign(srcp1)) result--;
|
|
break;
|
|
case ROUNDNEAREST:
|
|
if (Dbl_isone_roundbit(srcp1,srcp2,src_exponent))
|
|
if (Dbl_isone_stickybit(srcp1,srcp2,src_exponent) ||
|
|
(Dbl_isone_lowmantissap1(tempp1)))
|
|
if (Dbl_iszero_sign(srcp1)) result++;
|
|
else result--;
|
|
}
|
|
/* check for overflow */
|
|
if ((Dbl_iszero_sign(srcp1) && result < 0) ||
|
|
(Dbl_isone_sign(srcp1) && result > 0)) {
|
|
|
|
if (Dbl_iszero_sign(srcp1)) result = 0x7fffffff;
|
|
else result = 0x80000000;
|
|
|
|
if (Is_invalidtrap_enabled()) {
|
|
return(INVALIDEXCEPTION);
|
|
}
|
|
Set_invalidflag();
|
|
*dstptr = result;
|
|
return(NOEXCEPTION);
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
result = 0;
|
|
|
|
/* check for inexact */
|
|
if (Dbl_isnotzero_exponentmantissa(srcp1,srcp2)) {
|
|
inexact = TRUE;
|
|
/* round result */
|
|
switch (Rounding_mode()) {
|
|
case ROUNDPLUS:
|
|
if (Dbl_iszero_sign(srcp1)) result++;
|
|
break;
|
|
case ROUNDMINUS:
|
|
if (Dbl_isone_sign(srcp1)) result--;
|
|
break;
|
|
case ROUNDNEAREST:
|
|
if (src_exponent == -1)
|
|
if (Dbl_isnotzero_mantissa(srcp1,srcp2))
|
|
if (Dbl_iszero_sign(srcp1)) result++;
|
|
else result--;
|
|
}
|
|
}
|
|
}
|
|
*dstptr = result;
|
|
if (inexact) {
|
|
if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
|
|
else Set_inexactflag();
|
|
}
|
|
return(NOEXCEPTION);
|
|
}
|
|
|
|
/*
|
|
* Double Floating-point to Double Fixed-point
|
|
*/
|
|
/*ARGSUSED*/
|
|
int
|
|
dbl_to_dbl_fcnvfx(
|
|
dbl_floating_point *srcptr,
|
|
unsigned int *nullptr,
|
|
dbl_integer *dstptr,
|
|
unsigned int *status)
|
|
{
|
|
register int src_exponent, resultp1;
|
|
register unsigned int srcp1, srcp2, tempp1, tempp2, resultp2;
|
|
register boolean inexact = FALSE;
|
|
|
|
Dbl_copyfromptr(srcptr,srcp1,srcp2);
|
|
src_exponent = Dbl_exponent(srcp1) - DBL_BIAS;
|
|
|
|
/*
|
|
* Test for overflow
|
|
*/
|
|
if (src_exponent > DBL_FX_MAX_EXP) {
|
|
/* check for MININT */
|
|
if ((src_exponent > DBL_FX_MAX_EXP + 1) ||
|
|
Dbl_isnotzero_mantissa(srcp1,srcp2) || Dbl_iszero_sign(srcp1)) {
|
|
if (Dbl_iszero_sign(srcp1)) {
|
|
resultp1 = 0x7fffffff;
|
|
resultp2 = 0xffffffff;
|
|
}
|
|
else {
|
|
resultp1 = 0x80000000;
|
|
resultp2 = 0;
|
|
}
|
|
if (Is_invalidtrap_enabled()) {
|
|
return(INVALIDEXCEPTION);
|
|
}
|
|
Set_invalidflag();
|
|
Dint_copytoptr(resultp1,resultp2,dstptr);
|
|
return(NOEXCEPTION);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Generate result
|
|
*/
|
|
if (src_exponent >= 0) {
|
|
tempp1 = srcp1;
|
|
tempp2 = srcp2;
|
|
Dbl_clear_signexponent_set_hidden(tempp1);
|
|
Dint_from_dbl_mantissa(tempp1,tempp2,src_exponent,resultp1,
|
|
resultp2);
|
|
if (Dbl_isone_sign(srcp1)) {
|
|
Dint_setone_sign(resultp1,resultp2);
|
|
}
|
|
|
|
/* 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)) {
|
|
Dint_increment(resultp1,resultp2);
|
|
}
|
|
break;
|
|
case ROUNDMINUS:
|
|
if (Dbl_isone_sign(srcp1)) {
|
|
Dint_decrement(resultp1,resultp2);
|
|
}
|
|
break;
|
|
case ROUNDNEAREST:
|
|
if (Dbl_isone_roundbit(srcp1,srcp2,src_exponent))
|
|
if (Dbl_isone_stickybit(srcp1,srcp2,src_exponent) ||
|
|
(Dint_isone_lowp2(resultp2)))
|
|
if (Dbl_iszero_sign(srcp1)) {
|
|
Dint_increment(resultp1,resultp2);
|
|
}
|
|
else {
|
|
Dint_decrement(resultp1,resultp2);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
Dint_setzero(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)) {
|
|
Dint_increment(resultp1,resultp2);
|
|
}
|
|
break;
|
|
case ROUNDMINUS:
|
|
if (Dbl_isone_sign(srcp1)) {
|
|
Dint_decrement(resultp1,resultp2);
|
|
}
|
|
break;
|
|
case ROUNDNEAREST:
|
|
if (src_exponent == -1)
|
|
if (Dbl_isnotzero_mantissa(srcp1,srcp2))
|
|
if (Dbl_iszero_sign(srcp1)) {
|
|
Dint_increment(resultp1,resultp2);
|
|
}
|
|
else {
|
|
Dint_decrement(resultp1,resultp2);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
Dint_copytoptr(resultp1,resultp2,dstptr);
|
|
if (inexact) {
|
|
if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
|
|
else Set_inexactflag();
|
|
}
|
|
return(NOEXCEPTION);
|
|
}
|