Update GroupReduceUtils.h

Author: yucai-intel

src/ATen/native/xpu/sycl/GroupReduceUtils.h

@@ -120,11 +120,8 @@ inline T& SubgroupReduceWithoutBroadcast(
   auto sg_tid = sg.get_local_linear_id();
 #pragma unroll
   for (int offset = (SIMD >> 1); offset > 0; offset >>= 1) {
-    // for (int offset = 1; offset < SIMD; offset <<= 1) {
     T temp = sycl::shift_group_left(sg, val, offset);
-    // if (sg_tid < SIMD - offset) {
     val = op.combine(val, temp);
-    // }
   }
   return val;
 }
@@ -151,17 +148,13 @@ inline T& GroupReduceWithoutBroadcast(
     shared[sg_id] = val;
   }
   item.barrier(sycl_local_fence);
-  // val = (g_tid < n_sg) ? shared[sg_id] : identity_element;
   val = identity_element;
 
   if (sg_id == 0) {
     for (int i = sg_tid; i < n_sg; i += SIMD) {
       val = op.combine(val, shared[i]);
     }
     val = SubgroupReduceWithoutBroadcast<T, ReduceOp, SIMD, DIM>(item, val, op);
-    // for (int i = 1; i < n_sg; i++) {
-    //   val = op.combine(val, shared[i]);
-    // }
   }
   return val;
 }