Fix bug in accumulate

Author: christiangnrd

src/accumulate/accumulate_nd.jl

@@ -227,7 +227,7 @@ end
     # We have a block of threads to accumulate along the dims axis; do it in chunks of
     # block_size and keep track of previous chunks' running prefix
     ichunk = typeof(iblock)(0)
-    num_chunks = (length_dims + block_size - 0x1) ÷ block_size
+    num_chunks = (length_dims + (0x2 * block_size) - 0x1) ÷ (0x2 * block_size)
     total = neutral
 
     if ithread == 0x0
@@ -326,7 +326,7 @@ end
 
             # ...and accumulate the last value too
             if bi == 0x2 * block_size - 0x1
-                if iblock < num_chunks - 0x1
+                if ichunk < num_chunks - 0x1
                     temp[bi + bank_offset_b + 0x1] = op(t2, v[
                         input_base_idx +
                         ((ichunk + 0x1) * block_size * 0x2 - 0x1) * vstrides[dims] +