From: nowhere@nevernet.at   
      
   On 23/03/2022 18:20, James Harris wrote:   
   [about segreg image on stack]   
   >   
   > It's curious that the Pentium switched to pushing four bytes but later   
   > processors switched back to writing just two. I'd have thought that   
   > writing four would be more efficient overall as the words of stacks are   
   > commonly accessed in sequence and it could prevent the processor having   
   > to read a fully written line into cache.   
   >   
   > AMD maybe behaves differently.   
      
   what I saw in the past on AMD were previous stack contents in the upper   
   word, but haven't checked on recent versions (it should read zeros now).   
      
   > Either way, the point remains: if code is to be portable then the upper   
   > two bytes of a segreg push cannot be relied upon.   
      
   Yes, that's it. And by any luck the upper word is rare needed anyway :)   
   __   
   wolfgang   
      
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