workaround vulkan padding stall with new nvidia driver (#5953)

Author: nihui

src/layer/vulkan/shader/padding_pack1to4.comp

@@ -173,12 +173,20 @@ void main()
             ivec4 v_offset = y4 * psc(w) + x;
 
             afpvec4 v;
+#if ncnn_vendorID == 4318
+            // out of index load cause stall on nvidia
+            v.r = mask.r ? buffer_ld1(bottom_blob_data, v_offset.r) : value;
+            v.g = mask.g ? buffer_ld1(bottom_blob_data, v_offset.g) : value;
+            v.b = mask.b ? buffer_ld1(bottom_blob_data, v_offset.b) : value;
+            v.a = mask.a ? buffer_ld1(bottom_blob_data, v_offset.a) : value;
+#else
             v.r = buffer_ld1(bottom_blob_data, v_offset.r);
             v.g = buffer_ld1(bottom_blob_data, v_offset.g);
             v.b = buffer_ld1(bottom_blob_data, v_offset.b);
             v.a = buffer_ld1(bottom_blob_data, v_offset.a);
 
             v = mix(afpvec4(value), v, mask);
+#endif
 
             buffer_st4(top_blob_data, gi, v);
 #endif

src/layer/vulkan/shader/padding_pack1to8.comp

@@ -209,6 +209,17 @@ void main()
             ivec4 v_offset2 = yy4 * psc(w) + x;
 
             afpvec8 v;
+#if ncnn_vendorID == 4318
+            // out of index load cause stall on nvidia
+            v[0].r = mask.r ? buffer_ld1(bottom_blob_data, v_offset.r) : value;
+            v[0].g = mask.g ? buffer_ld1(bottom_blob_data, v_offset.g) : value;
+            v[0].b = mask.b ? buffer_ld1(bottom_blob_data, v_offset.b) : value;
+            v[0].a = mask.a ? buffer_ld1(bottom_blob_data, v_offset.a) : value;
+            v[1].r = mask2.r ? buffer_ld1(bottom_blob_data, v_offset2.r) : value;
+            v[1].g = mask2.g ? buffer_ld1(bottom_blob_data, v_offset2.g) : value;
+            v[1].b = mask2.b ? buffer_ld1(bottom_blob_data, v_offset2.b) : value;
+            v[1].a = mask2.a ? buffer_ld1(bottom_blob_data, v_offset2.a) : value;
+#else
             v[0].r = buffer_ld1(bottom_blob_data, v_offset.r);
             v[0].g = buffer_ld1(bottom_blob_data, v_offset.g);
             v[0].b = buffer_ld1(bottom_blob_data, v_offset.b);
@@ -220,6 +231,7 @@ void main()
 
             v[0] = mix(afpvec4(value), v[0], mask);
             v[1] = mix(afpvec4(value), v[1], mask2);
+#endif
 
             buffer_st8(top_blob_data, gi, v);
 #endif