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/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include "kernel/yosys.h"
#include "kernel/sigtools.h"
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
struct CutpointPass : public Pass {
CutpointPass() : Pass("cutpoint", "add hi/lo cover cells for each wire bit") { }
void help() YS_OVERRIDE
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" cutpoint [options] [selection]\n");
log("\n");
log("This command adds formal cut points to the design.\n");
log("\n");
log(" -undef\n");
log(" set cupoint nets to undef (x). the default behavior is to create a\n");
log(" $anyseq cell and drive the cutpoint net from that\n");
log("\n");
}
void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
{
bool flag_undef = false;
log_header(design, "Executing CUTPOINT pass.\n");
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++)
{
if (args[argidx] == "-undef") {
flag_undef = true;
continue;
}
break;
}
extra_args(args, argidx, design);
for (auto module : design->selected_modules())
{
if (design->selected_whole_module(module->name)) {
log("Making all outputs of module %s cut points, removing module contents.\n", log_id(module));
module->new_connections(std::vector<RTLIL::SigSig>());
for (auto cell : vector<Cell*>(module->cells()))
module->remove(cell);
vector<Wire*> output_wires;
for (auto wire : module->wires())
if (wire->port_output)
output_wires.push_back(wire);
for (auto wire : output_wires)
module->connect(wire, flag_undef ? Const(State::Sx, GetSize(wire)) : module->Anyseq(NEW_ID, GetSize(wire)));
continue;
}
SigMap sigmap(module);
pool<SigBit> cutpoint_bits;
for (auto cell : module->selected_cells()) {
if (cell->type == "$anyseq")
continue;
log("Removing cell %s.%s, making all cell outputs cutpoints.\n", log_id(module), log_id(cell));
for (auto &conn : cell->connections()) {
if (cell->output(conn.first))
module->connect(conn.second, flag_undef ? Const(State::Sx, GetSize(conn.second)) : module->Anyseq(NEW_ID, GetSize(conn.second)));
}
module->remove(cell);
}
for (auto wire : module->selected_wires()) {
if (wire->port_output) {
log("Making output wire %s.%s a cutpoint.\n", log_id(module), log_id(wire));
Wire *new_wire = module->addWire(NEW_ID, wire);
module->swap_names(wire, new_wire);
module->connect(new_wire, flag_undef ? Const(State::Sx, GetSize(new_wire)) : module->Anyseq(NEW_ID, GetSize(new_wire)));
wire->port_id = 0;
wire->port_input = false;
wire->port_output = false;
continue;
}
log("Making wire %s.%s a cutpoint.\n", log_id(module), log_id(wire));
for (auto bit : sigmap(wire))
cutpoint_bits.insert(bit);
}
if (!cutpoint_bits.empty())
{
for (auto cell : module->cells()) {
for (auto &conn : cell->connections()) {
if (!cell->output(conn.first))
continue;
SigSpec sig = sigmap(conn.second);
int bit_count = 0;
for (auto &bit : sig) {
if (cutpoint_bits.count(bit))
bit_count++;
}
if (bit_count == 0)
continue;
SigSpec dummy = module->addWire(NEW_ID, bit_count);
bit_count = 0;
for (auto &bit : sig) {
if (cutpoint_bits.count(bit))
bit = dummy[bit_count++];
}
cell->setPort(conn.first, sig);
}
}
vector<Wire*> rewrite_wires;
for (auto wire : module->wires()) {
if (!wire->port_input)
continue;
int bit_count = 0;
for (auto &bit : sigmap(wire))
if (cutpoint_bits.count(bit))
bit_count++;
if (bit_count)
rewrite_wires.push_back(wire);
}
for (auto wire : rewrite_wires) {
Wire *new_wire = module->addWire(NEW_ID, wire);
SigSpec lhs, rhs, sig = sigmap(wire);
for (int i = 0; i < GetSize(sig); i++)
if (!cutpoint_bits.count(sig[i])) {
lhs.append(SigBit(wire, i));
rhs.append(SigBit(new_wire, i));
}
if (GetSize(lhs))
module->connect(lhs, rhs);
module->swap_names(wire, new_wire);
wire->port_id = 0;
wire->port_input = false;
wire->port_output = false;
}
SigSpec sig(cutpoint_bits);
sig.sort_and_unify();
for (auto chunk : sig.chunks()) {
SigSpec s(chunk);
module->connect(s, flag_undef ? Const(State::Sx, GetSize(s)) : module->Anyseq(NEW_ID, GetSize(s)));
}
}
}
}
} CutpointPass;
PRIVATE_NAMESPACE_END
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