XPost: alt.folklore.computers   
   From: Peter@Iron-Spring.com   
      
   On 8/7/25 06:44, Terje Mathisen wrote:   
   >   
   > Bit addressing, presumably combined with an easy way to mask the   
   > results/pick an arbitrary number of bits less or equal to register   
   > width, makes it easier to impement compression/decompression/codecs.   
   >   
   > However, since the only thing needed to do the same on current CPUs is a   
   > single shift after an aligned load, this feature costs far too much in   
   > reduced address space compared to what you gain.   
   >   
      
   Bit addressing *as an option* (Bit Load, Bit store instructions, etc.)   
   is a great idea, for example it greatly simplifies BitBlt logic. The   
   432's use of bit addressing for everything, especially instructions,   
   seems just too cute. I forget the details, it's been a while since I   
   looked, but it forced extremely small code segments which, combined with   
   the segmentation logic, etc. really impacted performance.   
      
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