greenpak4: Added support for inferred input/output inverters on latches

diff --git a/techlibs/greenpak4/greenpak4_dffinv.cc b/techlibs/greenpak4/greenpak4_dffinv.cc
index ff63958e6d0e20b23625ef9e52463cc9df26846e..7d9d7d5b030d6aaf870824583396d1a059b19a35 100644 (file)
--- a/techlibs/greenpak4/greenpak4_dffinv.cc
+++ b/techlibs/greenpak4/greenpak4_dffinv.cc
@@ -26,6 +26,7 @@ PRIVATE_NAMESPACE_BEGIN
 void invert_gp_dff(Cell *cell, bool invert_input)
 {
        string cell_type = cell->type.str();
+       bool cell_type_latch = cell_type.find("LATCH") != string::npos;
        bool cell_type_i = cell_type.find('I') != string::npos;
        bool cell_type_r = cell_type.find('R') != string::npos;
        bool cell_type_s = cell_type.find('S') != string::npos;
@@ -79,25 +80,28 @@ void invert_gp_dff(Cell *cell, bool invert_input)
                cell_type_i = true;
        }
 
-       cell->type = stringf("\\GP_DFF%s%s%s", cell_type_s ? "S" : "", cell_type_r ? "R" : "", cell_type_i ? "I" : "");
+       if(cell_type_latch)
+               cell->type = stringf("\\GP_DLATCH%s%s%s", cell_type_s ? "S" : "", cell_type_r ? "R" : "", cell_type_i ? "I" : "");
+       else
+               cell->type = stringf("\\GP_DFF%s%s%s", cell_type_s ? "S" : "", cell_type_r ? "R" : "", cell_type_i ? "I" : "");
 
        log("Merged %s inverter into cell %s.%s: %s -> %s\n", invert_input ? "input" : "output",
                        log_id(cell->module), log_id(cell), cell_type.c_str()+1, log_id(cell->type));
 }
 
 struct Greenpak4DffInvPass : public Pass {
-       Greenpak4DffInvPass() : Pass("greenpak4_dffinv", "merge greenpak4 inverters and DFFs") { }
+       Greenpak4DffInvPass() : Pass("greenpak4_dffinv", "merge greenpak4 inverters and DFF/latches") { }
        virtual void help()
        {
                log("\n");
                log("    greenpak4_dffinv [options] [selection]\n");
                log("\n");
-               log("Merge GP_INV cells with GP_DFF* cells.\n");
+               log("Merge GP_INV cells with GP_DFF* and GP_DLATCH* cells.\n");
                log("\n");
        }
        virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
        {
-               log_header(design, "Executing GREENPAK4_DFFINV pass (merge synchronous set/reset into FF cells).\n");
+               log_header(design, "Executing GREENPAK4_DFFINV pass (merge input/output inverters into FF/latch cells).\n");
 
                size_t argidx;
                for (argidx = 1; argidx < args.size(); argidx++)
@@ -120,6 +124,15 @@ struct Greenpak4DffInvPass : public Pass {
                gp_dff_types.insert("\\GP_DFFSR");
                gp_dff_types.insert("\\GP_DFFSRI");
 
+               gp_dff_types.insert("\\GP_DLATCH");
+               gp_dff_types.insert("\\GP_DLATCHI");
+               gp_dff_types.insert("\\GP_DLATCHR");
+               gp_dff_types.insert("\\GP_DLATCHRI");
+               gp_dff_types.insert("\\GP_DLATCHS");
+               gp_dff_types.insert("\\GP_DLATCHSI");
+               gp_dff_types.insert("\\GP_DLATCHSR");
+               gp_dff_types.insert("\\GP_DLATCHSRI");
+
                for (auto module : design->selected_modules())
                {
                        SigMap sigmap(module);