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[/] [zipcpu/] [trunk/] [sim/] [cpp/] [twoc.cpp] - Diff between revs 204 and 209

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////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
//
//
// Filename:    twoc.cpp
// Filename:    twoc.cpp
//
//
// Project:     A Doubletime Pipelined FFT
// Project:     Zip CPU -- a small, lightweight, RISC CPU soft core
//
//
// Purpose:     Some various two's complement related C++ helper routines.
// Purpose:     Some various two's complement related C++ helper routines.
//              Specifically, these help extract signed numbers from
//              Specifically, these help extract signed numbers from
//              packed bitfields, while guaranteeing that the upper bits
//      packed bitfields, while guaranteeing that the upper bits are properly
//              are properly sign extended (or not) as desired.
//      sign extended (or not) as desired.
//
//
// Creator:     Dan Gisselquist, Ph.D.
// Creator:     Dan Gisselquist, Ph.D.
//              Gisselquist Technology, LLC
//              Gisselquist Technology, LLC
//
//
///////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
//
//
// Copyright (C) 2015, Gisselquist Technology, LLC
// Copyright (C) 2015,2017, Gisselquist Technology, LLC
//
//
// This program is free software (firmware): you can redistribute it and/or
// 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
// 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
// by the Free Software Foundation, either version 3 of the License, or (at
// your option) any later version.
// your option) any later version.
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// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
// for more details.
//
//
// You should have received a copy of the GNU General Public License along
// 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
// 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
// target there if the PDF file isn't present.)  If not, see
// <http://www.gnu.org/licenses/> for a copy.
// <http://www.gnu.org/licenses/> for a copy.
//
//
// License:     GPL, v3, as defined and found on www.gnu.org,
// License:     GPL, v3, as defined and found on www.gnu.org,
//              http://www.gnu.org/licenses/gpl.html
//              http://www.gnu.org/licenses/gpl.html
//
//
//
//
///////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
 
//
 
//
#include "twoc.h"
#include "twoc.h"
 
 
long    sbits(const long val, const int bits) {
long    sbits(const long val, const int bits) {
        long    r;
        long    r;
 
 

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