I feel like what you’d probably want to implement here are extensions that make ...

sgerenser · on May 17, 2023

This is essentially what Apple did with Apple Silicon to make Rosetta fast: https://dougallj.wordpress.com/2022/11/09/why-is-rosetta-2-f...

There’s a number of CPU features that make running translated x86 code much faster than it otherwise would be, like “Alternate Floating Point Mode” that happens to exactly match the x86’s floating point behavior.

pavlov · on May 17, 2023

Maybe something like Transmeta, where the instruction set was designed to act as a dynamic binary translation target:

https://en.wikipedia.org/wiki/Transmeta

xattt · on May 17, 2023

Transmets promised multiple architectures, but there was never a product demonstrated in the wild.

pavlov · on May 17, 2023

I think they demonstrated Sun picoJava support alongside x86, but no products actually shipped using this architecture:

https://en.wikipedia.org/wiki/PicoJava