Don't limit auto chunk size to (int) handle > INT_MAX instead of overflowing

src/threadpool.c

@@ -149,7 +149,10 @@ static void threadpool_chomp(struct threadpool *tp, int tid) {
     if (chunk_size < 1) chunk_size = 1;
 
     /* A chunk cannot exceed INT_MAX, as we use int elements in map_function. */
-    if (chunk_size > INT_MAX) chunk_size = INT_MAX;
+    if (chunk_size > INT_MAX) {
+       chunk_size = INT_MAX;
+.       message("chunking down to INT_MAX");
+    }
 
     /* Get a chunk and check its size. */
     size_t task_ind = atomic_add(&tp->map_data_count, chunk_size);
@@ -321,7 +324,7 @@ void threadpool_map(struct threadpool *tp, threadpool_map_function map_function,
   tp->map_data_count = 0;
   if (chunk == threadpool_auto_chunk_size) {
     tp->map_data_chunk =
-        max((int)(N / (tp->num_threads * threadpool_default_chunk_ratio)), 1);
+        max((N / (tp->num_threads * threadpool_default_chunk_ratio)), 1);
   } else if (chunk == threadpool_uniform_chunk_size) {
     tp->map_data_chunk = threadpool_uniform_chunk_size;
   } else {