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Added "share -limit"

This commit is contained in:
Clifford Wolf 2014-09-21 15:13:06 +02:00
parent a6c08b40fe
commit b28be0759f
1 changed files with 13 additions and 1 deletions
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14
passes/opt/share.cc
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@ -27,6 +27,7 @@ PRIVATE_NAMESPACE_BEGIN
struct ShareWorkerConfig struct ShareWorkerConfig
{ {
int limit;
bool opt_force; bool opt_force;
bool opt_aggressive; bool opt_aggressive;
bool opt_fast; bool opt_fast;
@ -751,7 +752,7 @@ struct ShareWorker
log("Found %d cells in module %s that may be considered for resource sharing.\n", log("Found %d cells in module %s that may be considered for resource sharing.\n",
SIZE(shareable_cells), log_id(module)); SIZE(shareable_cells), log_id(module));
while (!shareable_cells.empty()) while (!shareable_cells.empty() && config.limit != 0)
{ {
RTLIL::Cell *cell = *shareable_cells.begin(); RTLIL::Cell *cell = *shareable_cells.begin();
shareable_cells.erase(cell); shareable_cells.erase(cell);
@ -959,6 +960,9 @@ struct ShareWorker
for (auto c : topo_bit_drivers[bit]) for (auto c : topo_bit_drivers[bit])
topo_cell_drivers[cell].insert(c); topo_cell_drivers[cell].insert(c);
if (config.limit > 0)
config.limit--;
topo_cell_drivers[cell].insert(topo_cell_drivers[other_cell].begin(), topo_cell_drivers[other_cell].end()); topo_cell_drivers[cell].insert(topo_cell_drivers[other_cell].begin(), topo_cell_drivers[other_cell].end());
topo_cell_drivers[other_cell] = topo_cell_drivers[cell]; topo_cell_drivers[other_cell] = topo_cell_drivers[cell];
break; break;
@ -1013,11 +1017,15 @@ struct SharePass : public Pass {
log(" in much easier SAT problems at the cost of maybe missing some oportunities\n"); log(" in much easier SAT problems at the cost of maybe missing some oportunities\n");
log(" for resource sharing.\n"); log(" for resource sharing.\n");
log("\n"); log("\n");
log(" -limit N\n");
log(" Only perform the first N merges, then stop. This is useful for debugging.\n");
log("\n");
} }
virtual void execute(std::vector<std::string> args, RTLIL::Design *design) virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
{ {
ShareWorkerConfig config; ShareWorkerConfig config;
config.limit = -1;
config.opt_force = false; config.opt_force = false;
config.opt_aggressive = false; config.opt_aggressive = false;
config.opt_fast = false; config.opt_fast = false;
@ -1073,6 +1081,10 @@ struct SharePass : public Pass {
config.opt_fast = true; config.opt_fast = true;
continue; continue;
} }
if (args[argidx] == "-limit" && argidx+1 < args.size()) {
config.limit = atoi(args[++argidx].c_str());
continue;
}
break; break;
} }
extra_args(args, argidx, design); extra_args(args, argidx, design);