Small refactoring of inverted lists

Author: alexanderguzhva

faiss/invlists/DirectMap.cpp

@@ -199,7 +199,7 @@ size_t DirectMap::remove_ids(const IDSelector& sel, InvertedLists* invlists) {
                             last_id,
                             ScopedCodes(invlists, list_no, last).get());
                     // update hash entry for last element
-                    hashtable[last_id] = list_no << 32 | offset;
+                    hashtable[last_id] = lo_build(list_no, offset);
                 }
                 invlists->resize(list_no, last);
                 nremove++;

faiss/invlists/OnDiskInvertedLists.cpp

@@ -524,7 +524,7 @@ void OnDiskInvertedLists::free_slot(size_t offset, size_t capacity) {
         it++;
     }
 
-    size_t inf = 1UL << 60;
+    size_t inf = ((size_t)1) << 60;
 
     size_t end_prev = inf;
     if (it != slots.begin()) {
@@ -533,7 +533,7 @@ void OnDiskInvertedLists::free_slot(size_t offset, size_t capacity) {
         end_prev = prev->offset + prev->capacity;
     }
 
-    size_t begin_next = 1L << 60;
+    size_t begin_next = ((size_t)1) << 60;
     if (it != slots.end()) {
         begin_next = it->offset;
     }