From: terje.mathisen@nospicedham.tmsw.no   
      
   luserdroog wrote:   
   > On Friday, May 11, 2018 at 10:09:04 PM UTC-5, Alexei A. Frounze wrote:   
   >> If you must preserve bp, then you can do something like this:   
   >> mov ax, bp   
   >> mov bp, sp   
   >> mov bp, [bp+2]   
   >> xchg ax, bp   
   >>   
   >> If you don’t:   
   >> mov bp, sp   
   >> mov ax, [bp+2]   
   >>   
   >> Alex   
   >   
   > I've settled on using si for now. bp seems tempting for this, but   
   > you always have to have a displacement even if it's zero because   
   > mod=0 r/m=6 does something else. So using si I have   
   >   
   > mov si, sp   
   > mov ax, [si]   ; smaller encoding   
   >   
   > and   
   >   
   > mov si, sp   
   > mov ax, [si+2]   
      
   This fails every time SS is different from DS!   
      
   You _must_ use BP (which defaults to SS just like SP) or you need a ES:   
   override on the addressing.   
      
      mov si,sp   
      mov ax,[es:si+2]   
      
   But if you have SI as a spare register you can also use stack operations:   
      
      POP SI   
      POP AX   
      PUSH AX   
      PUSH SI   
      
   which is just 4 bytes of code.   
      
   Terje   
      
   --   
   -    
   "almost all programming can be viewed as an exercise in caching"   
      
   --- SoupGate-Win32 v1.05   
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