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Added abc -keepff option

This commit is contained in:
Clifford Wolf 2014-02-14 11:28:42 +01:00
parent de3ea9269a
commit 3121d19d95
1 changed files with 18 additions and 5 deletions
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23
passes/abc/abc.cc
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@ -109,7 +109,7 @@ static void mark_port(RTLIL::SigSpec sig)
}
}
static void extract_cell(RTLIL::Cell *cell)
static void extract_cell(RTLIL::Cell *cell, bool keepff)
{
if (cell->type == "$_DFF_N_" || cell->type == "$_DFF_P_")
{
@ -121,6 +121,11 @@ static void extract_cell(RTLIL::Cell *cell)
RTLIL::SigSpec sig_d = cell->connections["\\D"];
RTLIL::SigSpec sig_q = cell->connections["\\Q"];
if (keepff)
for (auto &c : sig_q.chunks)
if (c.wire != NULL)
c.wire->attributes["\\keep"] = 1;
assign_map.apply(sig_d);
assign_map.apply(sig_q);
@ -403,7 +408,7 @@ static std::string fold_abc_cmd(std::string str)
}
static void abc_module(RTLIL::Design *design, RTLIL::Module *current_module, std::string script_file, std::string exe_file,
std::string liberty_file, std::string constr_file, bool cleanup, int lut_mode, bool dff_mode, std::string clk_str)
std::string liberty_file, std::string constr_file, bool cleanup, int lut_mode, bool dff_mode, std::string clk_str, bool keepff)
{
module = current_module;
map_autoidx = RTLIL::autoidx++;
@ -498,7 +503,7 @@ static void abc_module(RTLIL::Design *design, RTLIL::Module *current_module, std
if (design->selected(current_module, it.second))
cells.push_back(it.second);
for (auto c : cells)
extract_cell(c);
extract_cell(c, keepff);
for (auto &wire_it : module->wires) {
if (wire_it.second->port_id > 0 || wire_it.second->get_bool_attribute("\\keep"))
@ -940,6 +945,10 @@ struct AbcPass : public Pass {
log(" with -dff, then it falls back to the automatic dection of clock domain\n");
log(" if the specified clock is not found in a module.)\n");
log("\n");
log(" -keepff\n");
log(" set the \"keep\" attribute on flip-flop output wires. (and thus preserve\n");
log(" them, for example for equivialence checking.)\n");
log("\n");
log(" -nocleanup\n");
log(" when this option is used, the temporary files created by this pass\n");
log(" are not removed. this is useful for debugging.\n");
@ -960,7 +969,7 @@ struct AbcPass : public Pass {
std::string exe_file = rewrite_yosys_exe("yosys-abc");
std::string script_file, liberty_file, constr_file, clk_str;
bool dff_mode = false, cleanup = true;
bool dff_mode = false, keepff = false, cleanup = true;
int lut_mode = 0;
size_t argidx;
@ -1001,6 +1010,10 @@ struct AbcPass : public Pass {
clk_str = args[++argidx];
continue;
}
if (arg == "-keepff") {
keepff = true;
continue;
}
if (arg == "-nocleanup") {
cleanup = false;
continue;
@ -1020,7 +1033,7 @@ struct AbcPass : public Pass {
if (mod_it.second->processes.size() > 0)
log("Skipping module %s as it contains processes.\n", mod_it.second->name.c_str());
else
abc_module(design, mod_it.second, script_file, exe_file, liberty_file, constr_file, cleanup, lut_mode, dff_mode, clk_str);
abc_module(design, mod_it.second, script_file, exe_file, liberty_file, constr_file, cleanup, lut_mode, dff_mode, clk_str, keepff);
}
assign_map.clear();