Optimize inner mining loop

src/miner.cpp

@@ -1079,6 +1079,9 @@ void static RandomXMiner()
     randomx_dataset *randomxDataset = randomx_alloc_dataset(flags);
     rxdebug("%s: created dataset\n");
 
+    auto datasetItemCount = randomx_dataset_item_count();
+    rxdebug("%s: dataset items=%lu\n", datasetItemCount);
+
     if( randomxDataset == nullptr) {
         LogPrintf("%s: allocating randomx dataset failed!\n", __func__);
         return;
@@ -1166,9 +1169,6 @@ void static RandomXMiner()
 
             }
 
-            auto datasetItemCount = randomx_dataset_item_count();
-            rxdebug("%s: dataset items=%lu\n", datasetItemCount);
-
             //TODO: this is hardcoded to use 2 threads instead of the number of mining threads
             rxdebug("%s: initializing dataset with 2 threads\n");
             std::thread t1(&randomx_init_dataset, randomxDataset, randomxCache, 0, datasetItemCount / 2);