Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

165 lines (140 sloc) 4.814 kb
/*
* Copyright (c) 2008 Stephen Williams (steve@icarus.com)
*
* This source code is free software; you can redistribute it
* and/or modify it in source code form under the terms of the GNU
* General Public License as published by the Free Software
* Foundation; either version 2 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
* 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
*/
# include "config.h"
# include <iostream>
# include <typeinfo>
# include <cstdlib>
# include "compiler.h"
# include "netlist.h"
# include "netmisc.h"
# include "ivl_target_priv.h"
# include "ivl_assert.h"
static bool has_enable(ivl_switch_type_t tt)
{
switch (tt) {
case IVL_SW_TRANIF0:
case IVL_SW_TRANIF1:
case IVL_SW_RTRANIF0:
case IVL_SW_RTRANIF1:
return true;
default:
return false;
}
}
NetTran::NetTran(NetScope*scope__, perm_string n, ivl_switch_type_t tt)
: NetNode(scope__, n, has_enable(tt)? 3 : 2), type_(tt)
{
pin(0).set_dir(Link::PASSIVE);
pin(1).set_dir(Link::PASSIVE);
if (pin_count() == 3) {
pin(2).set_dir(Link::INPUT); // Enable
}
}
NetTran::NetTran(NetScope*scope__, perm_string n, unsigned wid, unsigned part, unsigned off)
: NetNode(scope__, n, 2), type_(IVL_SW_TRAN_VP), wid_(wid), part_(part), off_(off)
{
pin(0).set_dir(Link::PASSIVE);
pin(1).set_dir(Link::PASSIVE);
}
NetTran::~NetTran()
{
}
unsigned NetTran::vector_width() const
{
return wid_;
}
unsigned NetTran::part_width() const
{
return part_;
}
unsigned NetTran::part_offset() const
{
return off_;
}
void join_island(NetPins*obj)
{
IslandBranch*branch = dynamic_cast<IslandBranch*> (obj);
// If this is not even a branch, then stop now.
if (branch == 0)
return;
// If this is a branch, but already given to an island, then
// stop.
if (branch->island_)
return;
list<NetObj*> uncommitted_neighbors;
// Look for neighboring objects that might already be in
// islands. If we find something, then join that island.
for (unsigned idx = 0 ; idx < obj->pin_count() ; idx += 1) {
Nexus*nex = obj->pin(idx).nexus();
for (Link*cur = nex->first_nlink() ; cur ; cur = cur->next_nlink()) {
unsigned pin;
NetPins*tmp_pins;
cur->cur_link(tmp_pins, pin);
NetObj*tmp = dynamic_cast<NetObj*> (tmp_pins);
if (tmp == 0)
continue;
// Skip self.
if (tmp == obj)
continue;
// If tmp is not a branch, then skip it.
IslandBranch*tmp_branch = dynamic_cast<IslandBranch*> (tmp);
if (tmp_branch == 0)
continue;
// If tmp is an uncommitted branch, then save
// it. When I finally choose an island for self,
// these branches will be scanned so that they join
// this island as well.
if (tmp_branch->island_ == 0) {
uncommitted_neighbors.push_back(tmp);
continue;
}
ivl_assert(*obj, branch->island_==0 || branch->island_==tmp_branch->island_);
// We found an existing island to join. Join it
// now. Keep scanning in order to find more neighbors.
if (branch->island_ == 0) {
if (debug_elaborate)
cerr << obj->get_fileline() << ": debug: "
<< "Join branch to existing island." << endl;
branch->island_ = tmp_branch->island_;
ivl_assert(*obj, branch->island_->discipline == tmp_branch->island_->discipline);
} else if (branch->island_ != tmp_branch->island_) {
cerr << obj->get_fileline() << ": internal error: "
<< "Oops, Found 2 neighboring islands." << endl;
ivl_assert(*obj, 0);
}
}
}
// If after all that we did not find an island to join, then
// start the island not and join it.
if (branch->island_ == 0) {
branch->island_ = new ivl_island_s;
branch->island_->discipline = branch->discipline_;
if (debug_elaborate)
cerr << obj->get_fileline() << ": debug: "
<< "Create new island for this branch" << endl;
}
// Now scan all the uncommitted neighbors I found. Calling
// join_island() on them will cause them to notice me in the
// process, and thus they will join my island. This process
// will recurse until all the connected branches join this island.
for (list<NetObj*>::iterator cur = uncommitted_neighbors.begin()
; cur != uncommitted_neighbors.end() ; cur ++ ) {
join_island(*cur);
}
}
Jump to Line
Something went wrong with that request. Please try again.