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Now prefer smallest cells in dfflibmap

This commit is contained in:
Clifford Wolf 2013-12-21 08:42:37 +01:00
parent 1fb29050e5
commit 8856cec308
1 changed files with 22 additions and 2 deletions
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24
passes/techmap/dfflibmap.cc
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@ -106,6 +106,7 @@ static void find_cell(LibertyAst *ast, std::string cell_type, bool clkpol, bool
LibertyAst *best_cell = NULL;
std::map<std::string, char> best_cell_ports;
int best_cell_pins = 0;
float best_cell_area = 0;
if (ast->id != "library")
log_error("Format error in liberty file.\n");
@ -141,6 +142,11 @@ static void find_cell(LibertyAst *ast, std::string cell_type, bool clkpol, bool
this_cell_ports[cell_rst_pin] = 'R';
this_cell_ports[cell_next_pin] = 'D';
float area = 0;
LibertyAst *ar = cell->find("area");
if (ar != NULL && !ar->value.empty())
area = atof(ar->value.c_str());
int num_pins = 0;
bool found_output = false;
for (auto pin : cell->children)
@ -174,14 +180,18 @@ static void find_cell(LibertyAst *ast, std::string cell_type, bool clkpol, bool
if (!found_output || (best_cell != NULL && num_pins > best_cell_pins))
continue;
if (best_cell != NULL && num_pins == best_cell_pins && area > best_cell_area)
continue;
best_cell = cell;
best_cell_pins = num_pins;
best_cell_area = area;
best_cell_ports.swap(this_cell_ports);
continue_cell_loop:;
}
if (best_cell != NULL) {
log(" cell %s is a direct match for cell type %s.\n", best_cell->args[0].c_str(), cell_type.substr(1).c_str());
log(" cell %s (pins=%d, area=%.2f) is a direct match for cell type %s.\n", best_cell->args[0].c_str(), best_cell_pins, best_cell_area, cell_type.substr(1).c_str());
cell_mappings[cell_type].cell_name = best_cell->args[0];
cell_mappings[cell_type].ports = best_cell_ports;
}
@ -192,6 +202,7 @@ static void find_cell_sr(LibertyAst *ast, std::string cell_type, bool clkpol, bo
LibertyAst *best_cell = NULL;
std::map<std::string, char> best_cell_ports;
int best_cell_pins = 0;
float best_cell_area = 0;
if (ast->id != "library")
log_error("Format error in liberty file.\n");
@ -223,6 +234,11 @@ static void find_cell_sr(LibertyAst *ast, std::string cell_type, bool clkpol, bo
this_cell_ports[cell_clr_pin] = 'R';
this_cell_ports[cell_next_pin] = 'D';
float area = 0;
LibertyAst *ar = cell->find("area");
if (ar != NULL && !ar->value.empty())
area = atof(ar->value.c_str());
int num_pins = 0;
bool found_output = false;
for (auto pin : cell->children)
@ -256,14 +272,18 @@ static void find_cell_sr(LibertyAst *ast, std::string cell_type, bool clkpol, bo
if (!found_output || (best_cell != NULL && num_pins > best_cell_pins))
continue;
if (best_cell != NULL && num_pins == best_cell_pins && area > best_cell_area)
continue;
best_cell = cell;
best_cell_pins = num_pins;
best_cell_area = area;
best_cell_ports.swap(this_cell_ports);
continue_cell_loop:;
}
if (best_cell != NULL) {
log(" cell %s is a direct match for cell type %s.\n", best_cell->args[0].c_str(), cell_type.substr(1).c_str());
log(" cell %s (pins=%d, area=%.2f) is a direct match for cell type %s.\n", best_cell->args[0].c_str(), best_cell_pins, best_cell_area, cell_type.substr(1).c_str());
cell_mappings[cell_type].cell_name = best_cell->args[0];
cell_mappings[cell_type].ports = best_cell_ports;
}