URL
https://opencores.org/ocsvn/xulalx25soc/xulalx25soc/trunk
Subversion Repositories xulalx25soc
Compare Revisions
- This comparison shows the changes necessary to convert path
/xulalx25soc/trunk
- from Rev 27 to Rev 28
- ↔ Reverse comparison
Rev 27 → Rev 28
/sw/twoc.cpp
0,0 → 1,55
//////////////////////////////////////////////////////////////////////////// |
// |
// Filename: twoc.cpp |
// |
// Project: A Doubletime Pipelined FFT |
// |
// Purpose: Some various two's complement related C++ helper routines. |
// Specifically, these help extract signed numbers from |
// packed bitfields, while guaranteeing that the upper bits |
// are properly sign extended (or not) as desired. |
// |
// Creator: Dan Gisselquist, Ph.D. |
// Gisselquist Technology, LLC |
// |
/////////////////////////////////////////////////////////////////////////// |
// |
// Copyright (C) 2015, Gisselquist Technology, LLC |
// |
// This program is free software (firmware): 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 3 of the License, 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 MERCHANTIBILITY 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. (It's in the $(ROOT)/doc directory, run make with no |
// target there if the PDF file isn't present.) If not, see |
// <http://www.gnu.org/licenses/> for a copy. |
// |
// License: GPL, v3, as defined and found on www.gnu.org, |
// http://www.gnu.org/licenses/gpl.html |
// |
// |
/////////////////////////////////////////////////////////////////////////// |
#include "twoc.h" |
|
long sbits(const long val, const int bits) { |
long r; |
|
r = val & ((1l<<bits)-1); |
if (r & (1l << (bits-1))) |
r |= (-1l << bits); |
return r; |
} |
|
unsigned long ubits(const long val, const int bits) { |
unsigned long r = val & ((1l<<bits)-1); |
return r; |
} |
|
|
/sw/twoc.h
0,0 → 1,46
//////////////////////////////////////////////////////////////////////////// |
// |
// Filename: twoc.h |
// |
// Project: A Doubletime Pipelined FFT |
// |
// Purpose: Some various two's complement related C++ helper routines. |
// Specifically, these help extract signed numbers from |
// packed bitfields, while guaranteeing that the upper bits |
// are properly sign extended (or not) as desired. |
// |
// Creator: Dan Gisselquist, Ph.D. |
// Gisselquist Technology, LLC |
// |
/////////////////////////////////////////////////////////////////////////// |
// |
// Copyright (C) 2015, Gisselquist Technology, LLC |
// |
// This program is free software (firmware): 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 3 of the License, 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 MERCHANTIBILITY 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. (It's in the $(ROOT)/doc directory, run make with no |
// target there if the PDF file isn't present.) If not, see |
// <http://www.gnu.org/licenses/> for a copy. |
// |
// License: GPL, v3, as defined and found on www.gnu.org, |
// http://www.gnu.org/licenses/gpl.html |
// |
// |
/////////////////////////////////////////////////////////////////////////// |
#ifndef TWOC_H |
#define TWOC_H |
|
extern long sbits(const long val, const int bits); |
extern unsigned long ubits(const long val, const int bits); |
|
#endif |
|