2 files changed, 11 insertions, 0 deletions
diff --git a/common/idstring.h b/common/idstring.h
index c3ccbc6b..aba40ae6 100644
--- a/common/idstring.h
+++ b/common/idstring.h
@@ -56,6 +56,8 @@ struct IdString
     bool operator!=(const IdString &other) const { return index != other.index; }
 
     bool empty() const { return index == 0; }
+
+    unsigned int hash() const { return index; }
 };
 
 NEXTPNR_NAMESPACE_END
diff --git a/common/idstringlist.h b/common/idstringlist.h
index 24a46731..753b408c 100644
--- a/common/idstringlist.h
+++ b/common/idstringlist.h
@@ -22,6 +22,7 @@
 #define IDSTRING_LIST_H
 
 #include <boost/functional/hash.hpp>
+#include "hashlib.h"
 #include "idstring.h"
 #include "nextpnr_namespaces.h"
 #include "sso_array.h"
@@ -67,6 +68,14 @@ struct IdStringList
 
     static IdStringList concat(IdStringList a, IdStringList b);
     IdStringList slice(size_t s, size_t e) const;
+
+    unsigned int hash() const
+    {
+        unsigned int h = mkhash_init;
+        for (const auto &val : ids)
+            h = mkhash(h, val.hash());
+        return h;
+    }
 };
 
 NEXTPNR_NAMESPACE_END