View difference between Paste ID: vGzBAE63 and dwsJviPW

-Lbl Down
+Lbl Up
 .r₁=row scan offset
 .r₂=column scan index
 .r₃=column dest index
 .r₄=last value slid
- 3
+ 0
 .For each row
  For(4)
   →r₁
-  0→r₄
+  0→r₄→r₃
-  12→r₃
+
   For(4)
    →r₂
    .If occupied by a tile
    If {+r₁+L₁}
     .Remove original tile
     Select(→r₅,0→{r₁+r₂+L₁})
     .If equal to the last slid tile
     !If -r₄
      .Increment merged tile value
      {r₁+r₃-4+L₁}++
-     {r₁+r₃+4+L₁}++
+
     Else
      .Store tile to destination and decrement destination index
      Select(r₅,→{r₃+4→r₃+r₁-4+L₁})
-     Select(r₅,→{r₃-4→r₃+r₁+4+L₁})
+
     .Store value last slid (or garbage if a merge occured)
     →r₄
    End
    r₂+4
-   r₂-4
+
   r₁+1
-  r₁-1
+
 Return