From: jgd@cix.co.uk   
      
   In article <10c6irh$er0$1@reader2.panix.com>,   
   cross@spitfire.i.gajendra.net (Dan Cross) wrote:   
   > In article ,   
   > John Dallman  wrote:   
      
   > >That is changing, reasonably quickly. ARM stopped releasing new   
   > >cores that could do A32 or T32 in 2023, having been phasing them   
   > >out since 2021.   
      
   I should have said "ARM stopped releasing new _A-profile_ cores that   
   could do A32 or T32 in 2023 ..."   
      
   > I wonder if this suggests that they'll introduce a compressed   
   > instruction set a la Thumb for 64 bit mode; -M profile seems to   
   > top out at ARMv8.1; and according to the ARMv8-M ARM, only   
   > supports T32.   
      
   ARM v8-M does not have 64-bit registers or instructions, or virtual   
   memory. It has an optional, simple, memory protection system. The   
   additions at ARMv8.1M are not the same as the ones in ARM v8.1A.   
      
   > Presumably at some point they'll introduce an ARMv9 core for   
   > the embedded market and this will become an issue.   
   >   
   > Or maybe they won't.  We could be in a world of 32-bit embedded   
   > cores in that space for a very long time indeed.   
      
   It depends what you're doing, really. Qualcomm cellphone-derived SoCs   
   with 64-bit Cortex-A cores are already widely used in robotics and   
   similar kinds of "embedded" uses. But there's no need at all for 64-bit   
   in tiny microcontrollers.   
      
   John   
      
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