could you make a new isa loosely based on x64, but new and modern so x64 run normal but no x86 support only emulation
this post was submitted on 27 Oct 2023
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It was inevitable and I'm surprised it's taken this long to get traction.
I wonder why they'd bother if it doesn't actually make a performance difference...
This is not done for performance, but it makes a difference in terms of cost; reduced validation times/effort.
The cores will be the mainly full x86 still, as backwards compatibility is basically free at this point in terms of power and silicon budget. But this opens the door for vendors to only support 64-bit EFI configurations.
The only selling point of x86 is backward compatibility. Remove that and you might as well move to a newer, better ISA.
I mean, that's literally the main selling point of a processor; being able to execute a software library.