bh_fuse_cache now uses unique view id's based on the seqset class for…

… calculation hash'es.

This means that the caches fusion result can be reuses for the same problem (code) run with different problem sizes.
More reuse of cache is good :)

core/bh_fuse_cache.cpp

@@ -47,29 +47,14 @@ namespace bohrium {
             const bh_view& view = instr.operand[oidx];
             if (bh_is_constant(&view))  // Ignore constants
                 continue;
-
-            uint64_t base_id;           // Hash the base array pointer
-            map<const bh_base*, uint64_t>::iterator it = batch.base2id.find(view.base);
-            if(it != batch.base2id.end()) {
-                base_id = it->second;
-            } else {
-                base_id = batch.base_id_count++;
-                batch.base2id.insert(make_pair(view.base, base_id));
-            }
-            this->append((char*)&base_id, sizeof(base_id));
-
-                                        // Hash ndim and start
-            this->append((char*)&view.ndim, sizeof(view.ndim));
-            this->append((char*)&view.start, sizeof(view.start));
-
-                                        // Hash shape and stride
-            this->append((char*)view.shape, sizeof(bh_index)*view.ndim);
-            this->append((char*)view.stride, sizeof(bh_index)*view.ndim);
+            std::pair<size_t,bool> vid = batch.views.insert(view);
+            size_t id = vid.first;
+            this->append((char*)&id, sizeof(id));
         }
     }
 
     //Constructor of the BatchHash class
-    BatchHash::BatchHash(const vector<bh_instruction> &instr_list):base_id_count(0)
+    BatchHash::BatchHash(const vector<bh_instruction> &instr_list)
     {
         string data;
         BOOST_FOREACH(const bh_instruction &instr, instr_list)

include/bh_fuse_cache.h

@@ -46,8 +46,9 @@ struct InstrHash: public std::string
  * (aka instruction list) */
 struct BatchHash
 {
-    uint64_t base_id_count;
-    std::map<const bh_base*, uint64_t> base2id;
+    // Sequence set of views used in this batch
+    seqset<bh_view> views;
+
     uint64_t _hash;
 
     /* Construct a BatchHash instant based on the instruction list */