How to prevent Vim scrolling when splitting a window ?

Here is a same post on stackoverflow:
http://stackoverflow.com/questions/12897276/how-to-prevent-vim-scrolling-when-splitting-a-window

nnoremap <C-W>s Hmx`` \|:split<CR>`xzt``

But the solution will get position register 'x' polluted,
Any better idea to achieve this ?

My eyes need to move up when quickfix window open (horizon split will cause origin window scroll up). and then move down when I close it.

copen/cclose are used frequently in my coding, and my eyes will move up and down
frequently, that's dizzy.

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