From: quadibloc@invalid.invalid   
      
   On Mon, 22 Dec 2025 20:00:06 +0000, Waldek Hebisch wrote:   
   > John Savard  wrote:   
   >> On Thu, 18 Dec 2025 22:25:08 +0000, Anton Ertl wrote:   
   >>   
   >>> It is certainly possible to decode potential instructions at every   
   >>> starting position in parallel, and later select the ones that actually   
   >>> correspond to the end of the previous instruction,   
   >>   
   >> Oh, yes, I had always realized that, but dismissed it as far too   
   >> wasteful.   
   >   
   > Well, Mitch claims average 35 bits per instructions, that means about   
   > 90% utilization of decoders, so not bad.   
      
   His minimum instruction size is 32 bits, but I was going for 16 bits.   
      
   > Also, consider that alternative to variable length instructions is to   
   > use longer instructions or more of them.   
      
   What I did instead was use variable-length instructions, but add a prefix   
   at the beginning of any 256-bit block of instructions that contained them   
   which directly showed where each instruction began.   
      
   My intent was to avoid the disadvantages you identify for fixed-length   
   instructions, but avoid the disadvantage of variable-length instructions   
   too.   
      
   John Savard   
      
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