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linux/arch/parisc/math-emu/fcnvfu.c

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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 150 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>
2019-05-24 12:04:10 +02:00
// SPDX-License-Identifier: GPL-2.0-or-later
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-16 15:20:36 -07:00
/*
* 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/fcnvfu.c $Revision: 1.1 $
*
* Purpose:
* Floating-point to Unsigned Fixed-point Converts
*
* External Interfaces:
* dbl_to_dbl_fcnvfu(srcptr,nullptr,dstptr,status)
* dbl_to_sgl_fcnvfu(srcptr,nullptr,dstptr,status)
* sgl_to_dbl_fcnvfu(srcptr,nullptr,dstptr,status)
* sgl_to_sgl_fcnvfu(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"
/************************************************************************
* Floating-point to Unsigned Fixed-point Converts *
************************************************************************/
/*
* Single Floating-point to Single Unsigned Fixed
*/
/*ARGSUSED*/
int
sgl_to_sgl_fcnvfu(
sgl_floating_point *srcptr,
unsigned int *nullptr,
unsigned int *dstptr,
unsigned int *status)
{
register unsigned int src, result;
register int src_exponent;
register boolean inexact = FALSE;
src = *srcptr;
src_exponent = Sgl_exponent(src) - SGL_BIAS;
/*
* Test for overflow
*/
if (src_exponent > SGL_FX_MAX_EXP + 1) {
if (Sgl_isone_sign(src)) {
result = 0;
} else {
result = 0xffffffff;
}
if (Is_invalidtrap_enabled()) {
return(INVALIDEXCEPTION);
}
Set_invalidflag();
*dstptr = result;
return(NOEXCEPTION);
}
/*
* Generate result
*/
if (src_exponent >= 0) {
/*
* Check sign.
* If negative, trap unimplemented.
*/
if (Sgl_isone_sign(src)) {
result = 0;
if (Is_invalidtrap_enabled()) {
return(INVALIDEXCEPTION);
}
Set_invalidflag();
*dstptr = result;
return(NOEXCEPTION);
}
Sgl_clear_signexponent_set_hidden(src);
Suint_from_sgl_mantissa(src,src_exponent,result);
/* check for inexact */
if (Sgl_isinexact_to_unsigned(src,src_exponent)) {
inexact = TRUE;
/* round result */
switch (Rounding_mode()) {
case ROUNDPLUS:
result++;
break;
case ROUNDMINUS: /* never negative */
break;
case ROUNDNEAREST:
if (Sgl_isone_roundbit(src,src_exponent) &&
(Sgl_isone_stickybit(src,src_exponent) ||
(result & 1))) {
result++;
}
break;
}
}
} 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 = 0;
if (Is_invalidtrap_enabled()) {
return(INVALIDEXCEPTION);
}
Set_invalidflag();
inexact = FALSE;
}
break;
case ROUNDNEAREST:
if (src_exponent == -1 &&
Sgl_isnotzero_mantissa(src)) {
if (Sgl_isone_sign(src)) {
result = 0;
if (Is_invalidtrap_enabled()) {
return(INVALIDEXCEPTION);
}
Set_invalidflag();
inexact = FALSE;
}
else result++;
}
break;
}
}
}
*dstptr = result;
if (inexact) {
if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
else Set_inexactflag();
}
return(NOEXCEPTION);
}
/*
* Single Floating-point to Double Unsigned Fixed
*/
/*ARGSUSED*/
int
sgl_to_dbl_fcnvfu(
sgl_floating_point *srcptr,
unsigned int *nullptr,
dbl_unsigned *dstptr,
unsigned int *status)
{
register int src_exponent;
register unsigned int src, resultp1, resultp2;
register boolean inexact = FALSE;
src = *srcptr;
src_exponent = Sgl_exponent(src) - SGL_BIAS;
/*
* Test for overflow
*/
if (src_exponent > DBL_FX_MAX_EXP + 1) {
if (Sgl_isone_sign(src)) {
resultp1 = resultp2 = 0;
} else {
resultp1 = resultp2 = 0xffffffff;
}
if (Is_invalidtrap_enabled()) {
return(INVALIDEXCEPTION);
}
Set_invalidflag();
Duint_copytoptr(resultp1,resultp2,dstptr);
return(NOEXCEPTION);
}
/*
* Generate result
*/
if (src_exponent >= 0) {
/*
* Check sign.
* If negative, trap unimplemented.
*/
if (Sgl_isone_sign(src)) {
resultp1 = resultp2 = 0;
if (Is_invalidtrap_enabled()) {
return(INVALIDEXCEPTION);
}
Set_invalidflag();
Duint_copytoptr(resultp1,resultp2,dstptr);
return(NOEXCEPTION);
}
Sgl_clear_signexponent_set_hidden(src);
Duint_from_sgl_mantissa(src,src_exponent,resultp1,resultp2);
/* check for inexact */
if (Sgl_isinexact_to_unsigned(src,src_exponent)) {
inexact = TRUE;
/* round result */
switch (Rounding_mode()) {
case ROUNDPLUS:
Duint_increment(resultp1,resultp2);
break;
case ROUNDMINUS: /* never negative */
break;
case ROUNDNEAREST:
if (Sgl_isone_roundbit(src,src_exponent) &&
(Sgl_isone_stickybit(src,src_exponent) ||
Duint_isone_lowp2(resultp2))) {
Duint_increment(resultp1,resultp2);
}
break;
}
}
} else {
Duint_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)) {
Duint_increment(resultp1,resultp2);
}
break;
case ROUNDMINUS:
if (Sgl_isone_sign(src)) {
resultp1 = resultp2 = 0;
if (Is_invalidtrap_enabled()) {
return(INVALIDEXCEPTION);
}
Set_invalidflag();
inexact = FALSE;
}
break;
case ROUNDNEAREST:
if (src_exponent == -1 &&
Sgl_isnotzero_mantissa(src)) {
if (Sgl_isone_sign(src)) {
resultp1 = 0;
resultp2 = 0;
if (Is_invalidtrap_enabled()) {
return(INVALIDEXCEPTION);
}
Set_invalidflag();
inexact = FALSE;
}
else Duint_increment(resultp1,resultp2);
}
}
}
}
Duint_copytoptr(resultp1,resultp2,dstptr);
if (inexact) {
if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
else Set_inexactflag();
}
return(NOEXCEPTION);
}
/*
* Double Floating-point to Single Unsigned Fixed
*/
/*ARGSUSED*/
int
dbl_to_sgl_fcnvfu (dbl_floating_point * srcptr, unsigned int *nullptr,
unsigned int *dstptr, unsigned int *status)
{
register unsigned int srcp1, srcp2, result;
register int src_exponent;
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 + 1) {
if (Dbl_isone_sign(srcp1)) {
result = 0;
} else {
result = 0xffffffff;
}
if (Is_invalidtrap_enabled()) {
return(INVALIDEXCEPTION);
}
Set_invalidflag();
*dstptr = result;
return(NOEXCEPTION);
}
/*
* Generate result
*/
if (src_exponent >= 0) {
/*
* Check sign.
* If negative, trap unimplemented.
*/
if (Dbl_isone_sign(srcp1)) {
result = 0;
if (Is_invalidtrap_enabled()) {
return(INVALIDEXCEPTION);
}
Set_invalidflag();
*dstptr = result;
return(NOEXCEPTION);
}
Dbl_clear_signexponent_set_hidden(srcp1);
Suint_from_dbl_mantissa(srcp1,srcp2,src_exponent,result);
/* check for inexact */
if (Dbl_isinexact_to_unsigned(srcp1,srcp2,src_exponent)) {
inexact = TRUE;
/* round result */
switch (Rounding_mode()) {
case ROUNDPLUS:
result++;
break;
case ROUNDMINUS: /* never negative */
break;
case ROUNDNEAREST:
if(Dbl_isone_roundbit(srcp1,srcp2,src_exponent) &&
(Dbl_isone_stickybit(srcp1,srcp2,src_exponent)||
result&1))
result++;
break;
}
/* check for overflow */
if (result == 0) {
result = 0xffffffff;
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 = 0;
if (Is_invalidtrap_enabled()) {
return(INVALIDEXCEPTION);
}
Set_invalidflag();
inexact = FALSE;
}
break;
case ROUNDNEAREST:
if (src_exponent == -1 &&
Dbl_isnotzero_mantissa(srcp1,srcp2))
if (Dbl_isone_sign(srcp1)) {
result = 0;
if (Is_invalidtrap_enabled()) {
return(INVALIDEXCEPTION);
}
Set_invalidflag();
inexact = FALSE;
}
else result++;
}
}
}
*dstptr = result;
if (inexact) {
if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
else Set_inexactflag();
}
return(NOEXCEPTION);
}
/*
* Double Floating-point to Double Unsigned Fixed
*/
/*ARGSUSED*/
int
dbl_to_dbl_fcnvfu (dbl_floating_point * srcptr, unsigned int *nullptr,
dbl_unsigned * dstptr, unsigned int *status)
{
register int src_exponent;
register unsigned int srcp1, srcp2, resultp1, 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 + 1) {
if (Dbl_isone_sign(srcp1)) {
resultp1 = resultp2 = 0;
} else {
resultp1 = resultp2 = 0xffffffff;
}
if (Is_invalidtrap_enabled()) {
return(INVALIDEXCEPTION);
}
Set_invalidflag();
Duint_copytoptr(resultp1,resultp2,dstptr);
return(NOEXCEPTION);
}
/*
* Generate result
*/
if (src_exponent >= 0) {
/*
* Check sign.
* If negative, trap unimplemented.
*/
if (Dbl_isone_sign(srcp1)) {
resultp1 = resultp2 = 0;
if (Is_invalidtrap_enabled()) {
return(INVALIDEXCEPTION);
}
Set_invalidflag();
Duint_copytoptr(resultp1,resultp2,dstptr);
return(NOEXCEPTION);
}
Dbl_clear_signexponent_set_hidden(srcp1);
Duint_from_dbl_mantissa(srcp1,srcp2,src_exponent,resultp1,
resultp2);
/* check for inexact */
if (Dbl_isinexact_to_unsigned(srcp1,srcp2,src_exponent)) {
inexact = TRUE;
/* round result */
switch (Rounding_mode()) {
case ROUNDPLUS:
Duint_increment(resultp1,resultp2);
break;
case ROUNDMINUS: /* never negative */
break;
case ROUNDNEAREST:
if(Dbl_isone_roundbit(srcp1,srcp2,src_exponent))
if(Dbl_isone_stickybit(srcp1,srcp2,src_exponent) ||
Duint_isone_lowp2(resultp2))
Duint_increment(resultp1,resultp2);
}
}
} else {
Duint_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)) {
Duint_increment(resultp1,resultp2);
}
break;
case ROUNDMINUS:
if (Dbl_isone_sign(srcp1)) {
resultp1 = resultp2 = 0;
if (Is_invalidtrap_enabled()) {
return(INVALIDEXCEPTION);
}
Set_invalidflag();
inexact = FALSE;
}
break;
case ROUNDNEAREST:
if (src_exponent == -1 &&
Dbl_isnotzero_mantissa(srcp1,srcp2))
if (Dbl_iszero_sign(srcp1)) {
Duint_increment(resultp1,resultp2);
} else {
resultp1 = 0;
resultp2 = 0;
if (Is_invalidtrap_enabled()) {
return(INVALIDEXCEPTION);
}
Set_invalidflag();
inexact = FALSE;
}
}
}
}
Duint_copytoptr(resultp1,resultp2,dstptr);
if (inexact) {
if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
else Set_inexactflag();
}
return(NOEXCEPTION);
}
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