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The 64-bit ARM ISA was basically redone from scratch, around 2010. It isn't "mostly the same instructions but with 64-bit registers" the way 64-bit x86 is.
by mjw1007 6y ago
The 64-bit ARM ISA was basically redone from scratch, around 2010.
It isn't "mostly the same instructions but with 64-bit registers" the way 64-bit x86 is.
- earthscienceman 6y agoDo you (or anyone else) know where I can read about that?
- mjw1007 6y agoThe reference manual is at https://developer.arm.com/documentation/ddi0487/latest/ https://developer.arm.com/documentation/ddi0487/latest/
- trasz 6y agoJust google for "ARMv8". (Also, it's not like ARM was a single instruction set before either. For quite some time ARM had two totally different instruction encodings, the "usual one", and Thumb2, with microcontrollers usually only supporting the latter.)