138 lines
3.2 KiB
C++
138 lines
3.2 KiB
C++
/*
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* Copyright (c) 2000 Stephen Williams (steve@icarus.com)
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*
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* This source code is free software; you can redistribute it
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* and/or modify it in source code form under the terms of the GNU
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* General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#ifdef HAVE_CVS_IDENT
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#ident "$Id: vvm_compare.cc,v 1.4 2002/08/12 01:35:06 steve Exp $"
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#endif
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# include "config.h"
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# include "vvm_gates.h"
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# include <assert.h>
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vvm_compare::vvm_compare(unsigned wid)
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: width_(wid)
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{
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gt_ = StX;
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lt_ = StX;
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ibits_ = new vpip_bit_t[2*width_];
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for (unsigned idx = 0 ; idx < 2*width_ ; idx += 1)
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ibits_[idx] = StX;
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}
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vvm_compare::~vvm_compare()
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{
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delete[]ibits_;
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}
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void vvm_compare::init_DataA(unsigned idx, vpip_bit_t val)
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{
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assert(idx < width_);
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ibits_[idx] = val;
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}
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void vvm_compare::init_DataB(unsigned idx, vpip_bit_t val)
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{
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assert(idx < width_);
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ibits_[width_+idx] = val;
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}
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vvm_nexus::drive_t* vvm_compare::config_ALB_out()
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{
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return &out_lt_;
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}
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vvm_nexus::drive_t* vvm_compare::config_ALEB_out()
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{
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return &out_le_;
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}
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vvm_nexus::drive_t* vvm_compare::config_AGB_out()
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{
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return &out_gt_;
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}
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vvm_nexus::drive_t* vvm_compare::config_AGEB_out()
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{
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return &out_ge_;
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}
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unsigned vvm_compare::key_DataA(unsigned idx) const
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{
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assert(idx < width_);
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return idx;
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}
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unsigned vvm_compare::key_DataB(unsigned idx) const
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{
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assert(idx < width_);
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return width_ + idx;
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}
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void vvm_compare::take_value(unsigned key, vpip_bit_t val)
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{
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if (ibits_[key] == val)
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return;
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ibits_[key] = val;
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compute_();
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}
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void vvm_compare::compute_()
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{
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vpip_bit_t gt = St0;
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vpip_bit_t lt = St0;
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vpip_bit_t*a = ibits_;
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vpip_bit_t*b = ibits_+width_;
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for (unsigned idx = 0 ; idx < width_ ; idx += 1) {
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gt = greater_with_cascade(a[idx], b[idx], gt);
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lt = less_with_cascade(a[idx], b[idx], lt);
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}
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if ((gt_ == gt) && (lt_ == lt)) return;
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gt_ = gt;
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lt_ = lt;
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out_lt_.set_value(lt_);
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out_le_.set_value(B_NOT(gt_));
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out_gt_.set_value(gt_);
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out_ge_.set_value(B_NOT(lt_));
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}
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/*
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* $Log: vvm_compare.cc,v $
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* Revision 1.4 2002/08/12 01:35:06 steve
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* conditional ident string using autoconfig.
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*
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* Revision 1.3 2001/07/25 03:10:50 steve
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* Create a config.h.in file to hold all the config
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* junk, and support gcc 3.0. (Stephan Boettcher)
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*
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* Revision 1.2 2000/03/22 04:26:41 steve
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* Replace the vpip_bit_t with a typedef and
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* define values for all the different bit
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* values, including strengths.
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*
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* Revision 1.1 2000/03/17 17:25:53 steve
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* Adder and comparator in nexus style.
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*
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*/
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