diff --git a/src/command.cpp b/src/command.cpp
index 7d305cd0b..27643e832 100644
--- a/src/command.cpp
+++ b/src/command.cpp
@@ -224,6 +224,7 @@ void VkCompute::record_download(const VkMat& m)
 void VkCompute::record_clone(const VkMat& src, const VkMat& dst)
 {
     record_prepare_transfer_barrier(src);
+    record_prepare_transfer_barrier(dst);
 
     if (vkdev->info.support_VK_KHR_push_descriptor)
         return copy_buffer(src.buffer(), src.buffer_offset(), dst.buffer(), dst.buffer_offset(), src.total() * src.elemsize);
@@ -249,6 +250,7 @@ void VkCompute::record_copy_region(const VkMat& src, const VkMat& dst, const VkB
 void VkCompute::record_copy_regions(const VkMat& src, const VkMat& dst, const std::vector<VkBufferCopy>& regions)
 {
     record_prepare_transfer_barrier(src);
+    record_prepare_transfer_barrier(dst);
 
     if (vkdev->info.support_VK_KHR_push_descriptor)
         return copy_buffer_regions(src.buffer(), dst.buffer(), regions);
diff --git a/src/layer/shader/softmax_div_sum_pack4.comp b/src/layer/shader/softmax_div_sum_pack4.comp
index 14aeef06a..24326f3ff 100644
--- a/src/layer/shader/softmax_div_sum_pack4.comp
+++ b/src/layer/shader/softmax_div_sum_pack4.comp
@@ -28,7 +28,7 @@ layout (local_size_y_id = 234) in;
 layout (local_size_z_id = 235) in;
 
 layout (binding = 0) buffer bottom_top_blob { sfpvec4 bottom_top_blob_data[]; };
-layout (binding = 1) readonly buffer sum_workspace { sfp sum_workspace_data[]; };
+layout (binding = 1) readonly buffer sum_workspace { sfpvec4 sum_workspace_data[]; };
 
 layout (push_constant) uniform parameter
 {
@@ -56,54 +56,42 @@ void main()
 
     if (p.dims == 1) // axis == 0
     {
-        afp sum = afp(sum_workspace_data[0]);
-        afpvec4 v = afpvec4(bottom_top_blob_data[gx]);
-        bottom_top_blob_data[gx] = sfpvec4(v / sum);
+        bottom_top_blob_data[gx] = sfpvec4(afpvec4(bottom_top_blob_data[gx]) / afpvec4(sum_workspace_data[0]));
         return;
     }
 
     if (p.dims == 2 && axis == 0)
     {
         int gi = gy * p.w + gx;
-        afp sum = afp(sum_workspace_data[gx]);
-        afpvec4 v = afpvec4(bottom_top_blob_data[gi]);
-        bottom_top_blob_data[gi] = sfpvec4(v / sum);
+        bottom_top_blob_data[gi] = sfpvec4(afpvec4(bottom_top_blob_data[gi]) / afpvec4(sum_workspace_data[gx]));
         return;
     }
 
     if (p.dims == 2 && axis == 1)
     {
         int gi = gy * p.w + gx;
-        afp sum = afp(sum_workspace_data[gy]);
-        afpvec4 v = afpvec4(bottom_top_blob_data[gi]);
-        bottom_top_blob_data[gi] = sfpvec4(v / sum);
+        bottom_top_blob_data[gi] = sfpvec4(afpvec4(bottom_top_blob_data[gi]) / afpvec4(sum_workspace_data[gy]));
         return;
     }
 
     if (p.dims == 3 && axis == 0)
     {
         int gi = gz * p.cstep + gy * p.w + gx;
-        afp sum = afp(sum_workspace_data[gy * p.w + gx]);
-        afpvec4 v = afpvec4(bottom_top_blob_data[gi]);
-        bottom_top_blob_data[gi] = sfpvec4(v / sum);
+        bottom_top_blob_data[gi] = sfpvec4(afpvec4(bottom_top_blob_data[gi]) / afpvec4(sum_workspace_data[gy * p.w + gx]));
         return;
     }
 
     if (p.dims == 3 && axis == 1)
     {
         int gi = gz * p.cstep + gy * p.w + gx;
-        afp sum = afp(sum_workspace_data[gz * p.w + gx]);
-        afpvec4 v = afpvec4(bottom_top_blob_data[gi]);
-        bottom_top_blob_data[gi] = sfpvec4(v / sum);
+        bottom_top_blob_data[gi] = sfpvec4(afpvec4(bottom_top_blob_data[gi]) / afpvec4(sum_workspace_data[gz * p.w + gx]));
         return;
     }
 
     if (p.dims == 3 && axis == 2)
     {
         int gi = gz * p.cstep + gy * p.w + gx;
-        afp sum = afp(sum_workspace_data[gz * p.h + gy]);
-        afpvec4 v = afpvec4(bottom_top_blob_data[gi]);
-        bottom_top_blob_data[gi] = sfpvec4(v / sum);
+        bottom_top_blob_data[gi] = sfpvec4(afpvec4(bottom_top_blob_data[gi]) / afpvec4(sum_workspace_data[gz * p.h + gy]));
         return;
     }
 }
diff --git a/src/layer/shader/softmax_exp_sub_max_pack4.comp b/src/layer/shader/softmax_exp_sub_max_pack4.comp
index 9ff016169..07292bffc 100644
--- a/src/layer/shader/softmax_exp_sub_max_pack4.comp
+++ b/src/layer/shader/softmax_exp_sub_max_pack4.comp
@@ -28,7 +28,7 @@ layout (local_size_y_id = 234) in;
 layout (local_size_z_id = 235) in;
 
 layout (binding = 0) buffer bottom_top_blob { sfpvec4 bottom_top_blob_data[]; };
-layout (binding = 1) readonly buffer max_workspace { sfp max_workspace_data[]; };
+layout (binding = 1) readonly buffer max_workspace { sfpvec4 max_workspace_data[]; };
 
 layout (push_constant) uniform parameter
 {
@@ -56,42 +56,42 @@ void main()
 
     if (p.dims == 1) // axis == 0
     {
-        bottom_top_blob_data[gx] = sfpvec4(exp(afpvec4(bottom_top_blob_data[gx]) - afp(max_workspace_data[0])));
+        bottom_top_blob_data[gx] = sfpvec4(exp(afpvec4(bottom_top_blob_data[gx]) - afpvec4(max_workspace_data[0])));
         return;
     }
 
     if (p.dims == 2 && axis == 0)
     {
         int gi = gy * p.w + gx;
-        bottom_top_blob_data[gi] = sfpvec4(exp(afpvec4(bottom_top_blob_data[gi]) - afp(max_workspace_data[gx])));
+        bottom_top_blob_data[gi] = sfpvec4(exp(afpvec4(bottom_top_blob_data[gi]) - afpvec4(max_workspace_data[gx])));
         return;
     }
 
     if (p.dims == 2 && axis == 1)
     {
         int gi = gy * p.w + gx;
-        bottom_top_blob_data[gi] = sfpvec4(exp(afpvec4(bottom_top_blob_data[gi]) - afp(max_workspace_data[gy])));
+        bottom_top_blob_data[gi] = sfpvec4(exp(afpvec4(bottom_top_blob_data[gi]) - afpvec4(max_workspace_data[gy])));
         return;
     }
 
     if (p.dims == 3 && axis == 0)
     {
         int gi = gz * p.cstep + gy * p.w + gx;
-        bottom_top_blob_data[gi] = sfpvec4(exp(afpvec4(bottom_top_blob_data[gi]) - afp(max_workspace_data[gy * p.w + gx])));
+        bottom_top_blob_data[gi] = sfpvec4(exp(afpvec4(bottom_top_blob_data[gi]) - afpvec4(max_workspace_data[gy * p.w + gx])));
         return;
     }
 
     if (p.dims == 3 && axis == 1)
     {
         int gi = gz * p.cstep + gy * p.w + gx;
-        bottom_top_blob_data[gi] = sfpvec4(exp(afpvec4(bottom_top_blob_data[gi]) - afp(max_workspace_data[gz * p.w + gx])));
+        bottom_top_blob_data[gi] = sfpvec4(exp(afpvec4(bottom_top_blob_data[gi]) - afpvec4(max_workspace_data[gz * p.w + gx])));
         return;
     }
 
     if (p.dims == 3 && axis == 2)
     {
         int gi = gz * p.cstep + gy * p.w + gx;
-        bottom_top_blob_data[gi] = sfpvec4(exp(afpvec4(bottom_top_blob_data[gi]) - afp(max_workspace_data[gz * p.h + gy])));
+        bottom_top_blob_data[gi] = sfpvec4(exp(afpvec4(bottom_top_blob_data[gi]) - afpvec4(max_workspace_data[gz * p.h + gy])));
         return;
     }
 }
diff --git a/src/layer/shader/softmax_reduce_max_pack4.comp b/src/layer/shader/softmax_reduce_max_pack4.comp
index 9dc074ae6..978535b53 100644
--- a/src/layer/shader/softmax_reduce_max_pack4.comp
+++ b/src/layer/shader/softmax_reduce_max_pack4.comp
@@ -28,7 +28,7 @@ layout (local_size_y_id = 234) in;
 layout (local_size_z_id = 235) in;
 
 layout (binding = 0) readonly buffer bottom_top_blob { sfpvec4 bottom_top_blob_data[]; };
-layout (binding = 1) writeonly buffer max_workspace { sfp max_workspace_data[]; };
+layout (binding = 1) writeonly buffer max_workspace { sfpvec4 max_workspace_data[]; };
 
 layout (push_constant) uniform parameter
 {
@@ -62,7 +62,7 @@ void main()
             max_value = max(max_value, afpvec4(bottom_top_blob_data[i]));
         }
         afpvec2 max2 = max(max_value.rg, max_value.ba);
-        max_workspace_data[0] = sfp(max(max2.r, max2.g));
+        max_workspace_data[0] = sfpvec4(max(max2.r, max2.g));
 
         return;
     }
@@ -76,7 +76,7 @@ void main()
             max_value = max(max_value, afpvec4(bottom_top_blob_data[v_offset]));
         }
         afpvec2 max2 = max(max_value.rg, max_value.ba);
-        max_workspace_data[gx] = sfp(max(max2.r, max2.g));
+        max_workspace_data[gx] = sfpvec4(max(max2.r, max2.g));
 
         return;
     }
@@ -89,8 +89,7 @@ void main()
             int v_offset = gx * p.w + i;
             max_value = max(max_value, afpvec4(bottom_top_blob_data[v_offset]));
         }
-        afpvec2 max2 = max(max_value.rg, max_value.ba);
-        max_workspace_data[gx] = sfp(max(max2.r, max2.g));
+        max_workspace_data[gx] = sfpvec4(max_value);
 
         return;
     }
@@ -104,7 +103,7 @@ void main()
             max_value = max(max_value, afpvec4(bottom_top_blob_data[v_offset]));
         }
         afpvec2 max2 = max(max_value.rg, max_value.ba);
-        max_workspace_data[gy * p.w + gx] = sfp(max(max2.r, max2.g));
+        max_workspace_data[gy * p.w + gx] = sfpvec4(max(max2.r, max2.g));
 
         return;
     }
@@ -117,8 +116,7 @@ void main()
             int v_offset = gy * p.cstep + i * p.w + gx;
             max_value = max(max_value, afpvec4(bottom_top_blob_data[v_offset]));
         }
-        afpvec2 max2 = max(max_value.rg, max_value.ba);
-        max_workspace_data[gy * p.w + gx] = sfp(max(max2.r, max2.g));
+        max_workspace_data[gy * p.w + gx] = sfpvec4(max_value);
 
         return;
     }
@@ -131,8 +129,7 @@ void main()
             int v_offset = gy * p.cstep + gx * p.w + i;
             max_value = max(max_value, afpvec4(bottom_top_blob_data[v_offset]));
         }
-        afpvec2 max2 = max(max_value.rg, max_value.ba);
-        max_workspace_data[gy * p.h + gx] = sfp(max(max2.r, max2.g));
+        max_workspace_data[gy * p.h + gx] = sfpvec4(max_value);
 
         return;
     }
diff --git a/src/layer/shader/softmax_reduce_sum_pack4.comp b/src/layer/shader/softmax_reduce_sum_pack4.comp
index 4b3f0826b..1ba17f3b5 100644
--- a/src/layer/shader/softmax_reduce_sum_pack4.comp
+++ b/src/layer/shader/softmax_reduce_sum_pack4.comp
@@ -28,7 +28,7 @@ layout (local_size_y_id = 234) in;
 layout (local_size_z_id = 235) in;
 
 layout (binding = 0) readonly buffer bottom_top_blob { sfpvec4 bottom_top_blob_data[]; };
-layout (binding = 1) writeonly buffer sum_workspace { sfp sum_workspace_data[]; };
+layout (binding = 1) writeonly buffer sum_workspace { sfpvec4 sum_workspace_data[]; };
 
 layout (push_constant) uniform parameter
 {
@@ -62,7 +62,7 @@ void main()
             sum_value += afpvec4(bottom_top_blob_data[i]);
         }
         afpvec2 sum2 = sum_value.rg + sum_value.ba;
-        sum_workspace_data[0] = sfp(sum2.r + sum2.g);
+        sum_workspace_data[0] = sfpvec4(sum2.r + sum2.g);
 
         return;
     }
@@ -76,7 +76,7 @@ void main()
             sum_value += afpvec4(bottom_top_blob_data[v_offset]);
         }
         afpvec2 sum2 = sum_value.rg + sum_value.ba;
-        sum_workspace_data[gx] = sfp(sum2.r + sum2.g);
+        sum_workspace_data[gx] = sfpvec4(sum2.r + sum2.g);
 
         return;
     }
@@ -89,8 +89,7 @@ void main()
             int v_offset = gx * p.w + i;
             sum_value += afpvec4(bottom_top_blob_data[v_offset]);
         }
-        afpvec2 sum2 = sum_value.rg + sum_value.ba;
-        sum_workspace_data[gx] = sfp(sum2.r + sum2.g);
+        sum_workspace_data[gx] = sfpvec4(sum_value);
 
         return;
     }
@@ -104,7 +103,7 @@ void main()
             sum_value += afpvec4(bottom_top_blob_data[v_offset]);
         }
         afpvec2 sum2 = sum_value.rg + sum_value.ba;
-        sum_workspace_data[ gy * p.w + gx ] = sfp(sum2.r + sum2.g);
+        sum_workspace_data[ gy * p.w + gx ] = sfpvec4(sum2.r + sum2.g);
 
         return;
     }
@@ -117,8 +116,7 @@ void main()
             int v_offset = gy * p.cstep + i * p.w + gx;
             sum_value += afpvec4(bottom_top_blob_data[v_offset]);
         }
-        afpvec2 sum2 = sum_value.rg + sum_value.ba;
-        sum_workspace_data[gy * p.w + gx] = sfp(sum2.r + sum2.g);
+        sum_workspace_data[gy * p.w + gx] = sfpvec4(sum_value);
 
         return;
     }
@@ -131,8 +129,7 @@ void main()
             int v_offset = gy * p.cstep + gx * p.w + i;
             sum_value += afpvec4(bottom_top_blob_data[v_offset]);
         }
-        afpvec2 sum2 = sum_value.rg + sum_value.ba;
-        sum_workspace_data[gy * p.h + gx] = sfp(sum2.r + sum2.g);
+        sum_workspace_data[gy * p.h + gx] = sfpvec4(sum_value);
 
         return;
     }
diff --git a/src/layer/softmax.cpp b/src/layer/softmax.cpp
index 20325b323..8c1bbf7c2 100644
--- a/src/layer/softmax.cpp
+++ b/src/layer/softmax.cpp
@@ -412,6 +412,7 @@ int Softmax::forward_inplace(VkMat& bottom_top_blob, VkCompute& cmd, const Optio
     int w = bottom_top_blob.w;
     int h = bottom_top_blob.h;
     int channels = bottom_top_blob.c;
+    size_t elemsize = bottom_top_blob.elemsize;
     int packing = bottom_top_blob.packing;
 
     VkMat max_workspace;
@@ -419,33 +420,33 @@ int Softmax::forward_inplace(VkMat& bottom_top_blob, VkCompute& cmd, const Optio
 
     if (dims == 1) // axis == 0
     {
-        max_workspace.create(1, 4u, opt.workspace_vkallocator, opt.staging_vkallocator);
-        sum_workspace.create(1, 4u, opt.workspace_vkallocator, opt.staging_vkallocator);
+        max_workspace.create(1, elemsize, packing, opt.workspace_vkallocator, opt.staging_vkallocator);
+        sum_workspace.create(1, elemsize, packing, opt.workspace_vkallocator, opt.staging_vkallocator);
     }
     else if (dims == 2 && axis == 0)
     {
-        max_workspace.create(w, 4u, opt.workspace_vkallocator, opt.staging_vkallocator);
-        sum_workspace.create(w, 4u, opt.workspace_vkallocator, opt.staging_vkallocator);
+        max_workspace.create(w, elemsize, packing, opt.workspace_vkallocator, opt.staging_vkallocator);
+        sum_workspace.create(w, elemsize, packing, opt.workspace_vkallocator, opt.staging_vkallocator);
     }
     else if (dims == 2 && axis == 1)
     {
-        max_workspace.create(h, 4u, opt.workspace_vkallocator, opt.staging_vkallocator);
-        sum_workspace.create(h, 4u, opt.workspace_vkallocator, opt.staging_vkallocator);
+        max_workspace.create(h, elemsize, packing, opt.workspace_vkallocator, opt.staging_vkallocator);
+        sum_workspace.create(h, elemsize, packing, opt.workspace_vkallocator, opt.staging_vkallocator);
     }
     else if (dims == 3 && axis == 0)
     {
-        max_workspace.create(w, h, 4u, opt.workspace_vkallocator, opt.staging_vkallocator);
-        sum_workspace.create(w, h, 4u, opt.workspace_vkallocator, opt.staging_vkallocator);
+        max_workspace.create(w, h, elemsize, packing, opt.workspace_vkallocator, opt.staging_vkallocator);
+        sum_workspace.create(w, h, elemsize, packing, opt.workspace_vkallocator, opt.staging_vkallocator);
     }
     else if (dims == 3 && axis == 1)
     {
-        max_workspace.create(w, channels, 4u, opt.workspace_vkallocator, opt.staging_vkallocator);
-        sum_workspace.create(w, channels, 4u, opt.workspace_vkallocator, opt.staging_vkallocator);
+        max_workspace.create(w, channels, elemsize, packing, opt.workspace_vkallocator, opt.staging_vkallocator);
+        sum_workspace.create(w, channels, elemsize, packing, opt.workspace_vkallocator, opt.staging_vkallocator);
     }
     else if (dims == 3 && axis == 2)
     {
-        max_workspace.create(h, channels, 4u, opt.workspace_vkallocator, opt.staging_vkallocator);
-        sum_workspace.create(h, channels, 4u, opt.workspace_vkallocator, opt.staging_vkallocator);
+        max_workspace.create(h, channels, elemsize, packing, opt.workspace_vkallocator, opt.staging_vkallocator);
+        sum_workspace.create(h, channels, elemsize, packing, opt.workspace_vkallocator, opt.staging_vkallocator);
     }
 
 //     fprintf(stderr, "Softmax::forward_inplace %p\n", bottom_top_blob.buffer());