From: muta...@gmail.com   
      
   On Tuesday, July 20, 2021 at 4:25:32 PM UTC+10, muta...@gmail.com wrote:   
      
   > > Yes, and this is different than in AM24. LA is   
   > > useful as arithmetic instruction with 12-bit   
   > > immediate. IIRC alternatives are much more   
   > > complicated (longer code).   
      
   > You shouldn't be using LA for arithmetic. That again   
   > is down to individual programmers. C code doesn't   
   > generate assembler like that, with gccmvs, from   
   > what I've seen. Loading a numeric using LA will   
   > trash the entire 64 bits if you are operating in   
   > AM64, which is not helpful if someone has   
   > meticulously set up the top 32 bits to have meaning   
   > when running 32-bit programs.   
      
   Just another point on this. In AM24, doing arithmetic   
   using pointers (LA) will only work for values up to 16 MiB - 1.   
      
   If you are only doing maths up to that value, that will   
   continue to work unchanged in all other address modes.   
      
   BFN. Paul.   
      
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