> "This is not achievable," one commenter named Monocasa wrote. "There is not enough rewritable microcode to do this even as a super slow hack. And even if all of the microcode were rewritable, microcode is kind of a fallback pathway on modern x86 cores with the fast path being hardwired decode for x86 instructions. And even if that were not the case the microcode decode and jump is itself hardwired for x86 instruction formats. And even if that were not the case the micro-ops are very non-RISC."
Though there could be some secondary downsides, this sounds like a nice opportunity for AMD too
> "This is not achievable," one commenter named Monocasa wrote. "There is not enough rewritable microcode to do this even as a super slow hack. And even if all of the microcode were rewritable, microcode is kind of a fallback pathway on modern x86 cores with the fast path being hardwired decode for x86 instructions. And even if that were not the case the microcode decode and jump is itself hardwired for x86 instruction formats. And even if that were not the case the micro-ops are very non-RISC."