[hakfoo]

I always thought there was value in a simpler take on this. Especially in the commercial-software world, not everything is compiled for the exact foibles of your current CPU.

Why aren't we running a JIT from x86 to "optimized subset of x86"? how much performance could it buy us?

[BuildTheRobots]

They kinda do - microcode translates x86(_64) into micro-opts for actual execution. If you go back far enough to the P6 the actual execution core was essentially RISC [1]

[1] https://news.ycombinator.com/item?id=36380149