mirror of
https://github.com/torvalds/linux.git
synced 2024-12-16 08:02:17 +00:00
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>
320 lines
7.2 KiB
C
320 lines
7.2 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/fcnvfut.c $Revision: 1.1 $
|
|
*
|
|
* Purpose:
|
|
* Floating-point to Unsigned Fixed-point Converts with Truncation
|
|
*
|
|
* External Interfaces:
|
|
* dbl_to_dbl_fcnvfut(srcptr,nullptr,dstptr,status)
|
|
* dbl_to_sgl_fcnvfut(srcptr,nullptr,dstptr,status)
|
|
* sgl_to_dbl_fcnvfut(srcptr,nullptr,dstptr,status)
|
|
* sgl_to_sgl_fcnvfut(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 with Truncation *
|
|
************************************************************************/
|
|
|
|
/*
|
|
* Convert single floating-point to single fixed-point format
|
|
* with truncated result
|
|
*/
|
|
/*ARGSUSED*/
|
|
int
|
|
sgl_to_sgl_fcnvfut (sgl_floating_point * srcptr, unsigned int *nullptr,
|
|
unsigned int *dstptr, unsigned int *status)
|
|
{
|
|
register unsigned int src, result;
|
|
register int src_exponent;
|
|
|
|
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);
|
|
*dstptr = result;
|
|
|
|
/* check for inexact */
|
|
if (Sgl_isinexact_to_unsigned(src,src_exponent)) {
|
|
if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
|
|
else Set_inexactflag();
|
|
}
|
|
}
|
|
else {
|
|
*dstptr = 0;
|
|
|
|
/* check for inexact */
|
|
if (Sgl_isnotzero_exponentmantissa(src)) {
|
|
if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
|
|
else Set_inexactflag();
|
|
}
|
|
}
|
|
return(NOEXCEPTION);
|
|
}
|
|
|
|
/*
|
|
* Single Floating-point to Double Unsigned Fixed
|
|
*/
|
|
/*ARGSUSED*/
|
|
int
|
|
sgl_to_dbl_fcnvfut (sgl_floating_point * srcptr, unsigned int *nullptr,
|
|
dbl_unsigned * dstptr, unsigned int *status)
|
|
{
|
|
register int src_exponent;
|
|
register unsigned int src, resultp1, resultp2;
|
|
|
|
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);
|
|
Duint_copytoptr(resultp1,resultp2,dstptr);
|
|
|
|
/* check for inexact */
|
|
if (Sgl_isinexact_to_unsigned(src,src_exponent)) {
|
|
if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
|
|
else Set_inexactflag();
|
|
}
|
|
}
|
|
else {
|
|
Duint_setzero(resultp1,resultp2);
|
|
Duint_copytoptr(resultp1,resultp2,dstptr);
|
|
|
|
/* check for inexact */
|
|
if (Sgl_isnotzero_exponentmantissa(src)) {
|
|
if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
|
|
else Set_inexactflag();
|
|
}
|
|
}
|
|
return(NOEXCEPTION);
|
|
}
|
|
|
|
/*
|
|
* Double Floating-point to Single Unsigned Fixed
|
|
*/
|
|
/*ARGSUSED*/
|
|
int
|
|
dbl_to_sgl_fcnvfut (dbl_floating_point * srcptr, unsigned int *nullptr,
|
|
unsigned int *dstptr, unsigned int *status)
|
|
{
|
|
register unsigned int srcp1, srcp2, result;
|
|
register int src_exponent;
|
|
|
|
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);
|
|
*dstptr = result;
|
|
|
|
/* check for inexact */
|
|
if (Dbl_isinexact_to_unsigned(srcp1,srcp2,src_exponent)) {
|
|
if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
|
|
else Set_inexactflag();
|
|
}
|
|
}
|
|
else {
|
|
*dstptr = 0;
|
|
|
|
/* check for inexact */
|
|
if (Dbl_isnotzero_exponentmantissa(srcp1,srcp2)) {
|
|
if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
|
|
else Set_inexactflag();
|
|
}
|
|
}
|
|
return(NOEXCEPTION);
|
|
}
|
|
|
|
/*
|
|
* Double Floating-point to Double Unsigned Fixed
|
|
*/
|
|
/*ARGSUSED*/
|
|
int
|
|
dbl_to_dbl_fcnvfut (dbl_floating_point * srcptr, unsigned int *nullptr,
|
|
dbl_unsigned * dstptr, unsigned int *status)
|
|
{
|
|
register int src_exponent;
|
|
register unsigned int srcp1, srcp2, resultp1, resultp2;
|
|
|
|
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);
|
|
Duint_copytoptr(resultp1,resultp2,dstptr);
|
|
|
|
/* check for inexact */
|
|
if (Dbl_isinexact_to_unsigned(srcp1,srcp2,src_exponent)) {
|
|
if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
|
|
else Set_inexactflag();
|
|
}
|
|
}
|
|
else {
|
|
Duint_setzero(resultp1,resultp2);
|
|
Duint_copytoptr(resultp1,resultp2,dstptr);
|
|
|
|
/* check for inexact */
|
|
if (Dbl_isnotzero_exponentmantissa(srcp1,srcp2)) {
|
|
if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
|
|
else Set_inexactflag();
|
|
}
|
|
}
|
|
return(NOEXCEPTION);
|
|
}
|