Add fast IdString <-> PortPin conversion

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

2 files changed, 13 insertions, 14 deletions

diff --git a/ice40/chip.cc b/ice40/chip.cc
index 88fcc512..918a7fb4 100644
--- a/ice40/chip.cc
+++ b/ice40/chip.cc
@@ -52,27 +52,25 @@ BelType belTypeFromId(IdString id)
 
 // -----------------------------------------------------------------------
 
-IdString portPinToId(PortPin type)
+void IdString::initialize_chip()
 {
-#define X(t)                                                                   \
-    if (type == PIN_##t)                                                       \
-        return #t;
-
+#define X(t) initialize_add(#t, PIN_##t);
 #include "portpins.inc"
-
 #undef X
-    return IdString();
 }
 
-PortPin portPinFromId(IdString id)
+IdString portPinToId(PortPin type)
 {
-#define X(t)                                                                   \
-    if (id == #t)                                                              \
-        return PIN_##t;
-
-#include "portpins.inc"
+    IdString ret;
+    if (type > 0 && type < PIN_MAXIDX)
+        ret.index = type;
+    return ret;
+}
 
-#undef X
+PortPin portPinFromId(IdString id)
+{
+    if (id.index > 0 && id.index < PIN_MAXIDX)
+        return PortPin(id.index);
     return PIN_NONE;
 }
 
diff --git a/ice40/chip.h b/ice40/chip.h
index 73e8d33b..f8946610 100644
--- a/ice40/chip.h
+++ b/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);