diff --git a/mace/kernels/opencl/cl/common.h b/mace/kernels/opencl/cl/common.h
index a6be3c53e52e9a68879f697d6cf994b4126450d4..74c5b67afba196847501d5645f66cd2ad59ba3b0 100644
--- a/mace/kernels/opencl/cl/common.h
+++ b/mace/kernels/opencl/cl/common.h
@@ -1,2 +1,11 @@
+//
+// Copyright (c) 2017 XiaoMi All rights reserved.
+//
+
+#ifndef MACE_KERNELS_OPENCL_CL_COMMON_H_
+#define MACE_KERNELS_OPENCL_CL_COMMON_H_
+
 #pragma OPENCL EXTENSION cl_khr_fp16 : enable
 #pragma OPENCL EXTENSION cl_khr_3d_image_writes : enable
+
+#endif  // MACE_KERNELS_OPENCL_CL_COMMON_H_
diff --git a/mace/kernels/opencl/cl/conv_2d_1x1.cl b/mace/kernels/opencl/cl/conv_2d_1x1.cl
index dc5b1f816e99a6466b8183160c1fa7104c58aaaf..ae004658f707f5a9d1c74a76afd69ef324d4ce18 100644
--- a/mace/kernels/opencl/cl/conv_2d_1x1.cl
+++ b/mace/kernels/opencl/cl/conv_2d_1x1.cl
@@ -35,8 +35,6 @@ __kernel void conv_2d_1x1_v2(__global const float *input, /* n, c, h, w */
   int out_chan_blk = get_global_id(1);
   int out_pixel_blk = get_global_id(2);
 
-  __private float output_slice[4 * 4];
-
   const int out_chan_begin = out_chan_blk * 4;
   const int out_chan_end = min(out_chan_begin + 4, out_chan_num);
   const int out_pixel_begin = out_pixel_blk * 4;
@@ -52,10 +50,10 @@ __kernel void conv_2d_1x1_v2(__global const float *input, /* n, c, h, w */
   int pixel_len = out_pixel_end - out_pixel_begin;
 
   for (int out_chan = out_chan_begin; out_chan < out_chan_end; ++out_chan) {
+    float *output_ptr = output_base + out_chan * pixel_num;
     float bias_value = bias[out_chan];
-    int out_chan_offset = out_chan - out_chan_begin;
     for (int p = 0; p < pixel_len; ++p) {
-      output_slice[out_chan_offset * 4 + p] = bias_value;
+      output_ptr[p] = bias_value;
     }
   }
 
@@ -74,29 +72,28 @@ __kernel void conv_2d_1x1_v2(__global const float *input, /* n, c, h, w */
         #pragma unroll
         for (int oc = 0; oc < 4; ++oc) {
           float4 weights = vload4(0, filter_ptr + oc * in_chan_num);
-          float4 out = vload4(oc, output_slice);
+          float4 out = vload4(0, output_ptr + oc * pixel_num);
           out += in0 * weights.x;
           out += in1 * weights.y;
           out += in2 * weights.z;
           out += in3 * weights.w;
-          vstore4(out, oc, output_slice);
+          vstore4(out, 0, output_ptr + oc * pixel_num);
         }
       }
       for (; out_chan < out_chan_end; ++out_chan) {
         const float* filter_ptr = filter + out_chan * in_chan_num + in_chan;
         float *output_ptr = output_base + out_chan * pixel_num;
-        int out_chan_offset = out_chan - out_chan_begin;
         float4 weights = vload4(0, filter_ptr);
         float4 in0 = vload4(0, input_ptr);
         float4 in1 = vload4(0, input_ptr + pixel_num);
         float4 in2 = vload4(0, input_ptr + 2 * pixel_num);
         float4 in3 = vload4(0, input_ptr + 3 * pixel_num);
-        float4 out = vload4(out_chan_offset, output_slice);
+        float4 out = vload4(0, output_ptr);
         out += in0 * weights.x;
         out += in1 * weights.y;
         out += in2 * weights.z;
         out += in3 * weights.w;
-        vstore4(out, out_chan_offset, output_slice);
+        vstore4(out, 0, output_ptr);
       }
     }
   }
@@ -106,25 +103,10 @@ __kernel void conv_2d_1x1_v2(__global const float *input, /* n, c, h, w */
     for (int out_chan = out_chan_begin; out_chan < out_chan_end; ++out_chan) {
       float weights = filter[out_chan * in_chan_num + in_chan];
       float *output_ptr = output_base + out_chan * pixel_num;
-      int out_chan_offset = out_chan - out_chan_begin;
 
       for (int p = 0; p < pixel_len; ++p) {
         float in = input_ptr[p];
-        output_slice[out_chan_offset * 4 + p] += in * weights;
-      }
-    }
-  }
-
-  for (int out_chan_offset = 0; out_chan_offset < out_chan_len; ++out_chan_offset) {
-    int out_chan = out_chan_begin + out_chan_offset;
-    float *output_ptr = output_base + out_chan * pixel_num;
-    if (pixel_len == 4) {
-      float4 out = vload4(out_chan_offset, output_slice);
-      vstore4(out, 0, output_ptr);
-    } else {
-      int offset = out_chan_offset << 2;
-      for (int p = 0; p < pixel_len; ++p) {
-        output_ptr[p] = output_slice[offset + p];
+        output_ptr[p] += in * weights;
       }
     }
   }
diff --git a/mace/ops/conv_2d_benchmark.cc b/mace/ops/conv_2d_benchmark.cc
index fb859da80011c7e31e2f88bf4e215940d7ae02ff..0d201a2f5a7a60089b77b9387932c0c11b9f639d 100644
--- a/mace/ops/conv_2d_benchmark.cc
+++ b/mace/ops/conv_2d_benchmark.cc
@@ -80,6 +80,8 @@ constexpr int kItersToSync = 10;
   BM_CONV_2D_MACRO(N, C, H, W, KH, KW, S, P, OC, TYPE, NEON); \
   BM_CONV_2D_MACRO(N, C, H, W, KH, KW, S, P, OC, TYPE, OPENCL);
 
+BM_CONV_2D(1, 3, 4032, 3016, 1, 1, 1, VALID, 3, float);  // Test RGB <-> YUV
+BM_CONV_2D(1, 3, 480, 480, 1, 1, 1, VALID, 3, float);  // Test RGB <-> YUV
 BM_CONV_2D(1, 64, 32, 32, 1, 1, 1, VALID, 128, float);
 BM_CONV_2D(1, 64, 33, 31, 1, 1, 1, VALID, 128, float);  // Test bad alignments
 BM_CONV_2D(1, 3, 512, 512, 1, 1, 1, VALID, 3, float);