--- /dev/null
+#ifndef LIMB_H
+#define LIMB_H
+
+#include <stdint.h>
+
+#include "bitness.h"
+
+#ifdef USE_64BIT
+
+typedef int64_t limb_t;
+typedef __int128_t llimb_t;
+
+#else
+
+typedef int32_t limb_t;
+typedef int64_t llimb_t;
+
+#endif
+
+
+#endif