Add fast IdString <-> PortPin conversion

Signed-off-by: Clifford Wolf <clifford@clifford.at>

common/nextpnr.cc

@@ -28,7 +28,15 @@ void IdString::initialize()
 {
     database_str_to_idx = new std::unordered_map<std::string, int>;
     database_idx_to_str = new std::vector<const std::string*>;
-    auto insert_rc = database_str_to_idx->insert({std::string(), 0});
+    initialize_add("", 0);
+    initialize_chip();
+}
+
+void IdString::initialize_add(const char *s, int idx)
+{
+    assert(database_str_to_idx->count(s) == 0);
+    assert(database_idx_to_str->size() == idx);
+    auto insert_rc = database_str_to_idx->insert({s, idx});
     database_idx_to_str->push_back(&insert_rc.first->first);
 }
 

common/nextpnr.h

@@ -48,7 +48,9 @@ struct IdString
     static std::unordered_map<std::string, int> *database_str_to_idx;
     static std::vector<const std::string*> *database_idx_to_str;
 
-    void initialize();
+    static void initialize();
+    static void initialize_chip();
+    static void initialize_add(const char *s, int idx);
 
     IdString() {}
 

dummy/chip.cc

@@ -24,6 +24,9 @@ NEXTPNR_NAMESPACE_BEGIN
 Chip::Chip(ChipArgs) {}
 
 std::string Chip::getChipName() { return "Dummy"; }
+
+void IdString::initialize_chip() {}
+
 // ---------------------------------------------------------------
 
 BelId Chip::getBelByName(IdString name) const { return BelId(); }

ice40/chip.cc

@@ -52,27 +52,25 @@ BelType belTypeFromId(IdString id)
 
 // -----------------------------------------------------------------------
 
+void IdString::initialize_chip()
+{
+#define X(t) initialize_add(#t, PIN_##t);
+#include "portpins.inc"
+#undef X
+}
+
 IdString portPinToId(PortPin type)
 {
-#define X(t)                                                                   \
-    if (type == PIN_##t)                                                       \
-        return #t;
-
-#include "portpins.inc"
-
-#undef X
-    return IdString();
+    IdString ret;
+    if (type > 0 && type < PIN_MAXIDX)
+        ret.index = type;
+    return ret;
 }
 
 PortPin portPinFromId(IdString id)
 {
-#define X(t)                                                                   \
-    if (id == #t)                                                              \
-        return PIN_##t;
-
-#include "portpins.inc"
-
-#undef X
+    if (id.index > 0 && id.index < PIN_MAXIDX)
+        return PortPin(id.index);
     return PIN_NONE;
 }
 

ice40/chip.h

@@ -62,6 +62,7 @@ enum PortPin
 #define X(t) PIN_##t,
 #include "portpins.inc"
 #undef X
+    PIN_MAXIDX
 };
 
 IdString portPinToId(PortPin type);