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Apologies if this is obvious - is this ISA specific, or does it sit upon cross platform libs? I ask because I'm very interested in this, but am working on AR

Apologies if this is obvious - is this ISA specific, or does it sit upon cross platform libs? I ask because I'm *very* interested in this, but am working on ARM Edit - just to be clear why I'm interested. For me it matters not if Ruby is slow, until it does, which is usually a very specific and obvious piece of code.

arthur2e5 5y ago
It’s x86-64 only. A quick look at the https://github.com/tenderlove/tenderjit/blob/main/lib/tenderjit/iseq_compiler.rb https://github.com/tenderlove/tenderjit/blob/main/lib/tender... linked from the README reveals heavy references to x86-64 registers. The “Fisk” library used appears to be a x86-64 assembler in Ruby. I guess that’s to be expected with “pure ruby” — all the cross-insn backends you can use (Cranelift, LLVM) are written in not-Ruby.
gnulinux 5y ago
How can you do ISA-agnostic JIT unless you implement a separate backend for each ISA? I.e. is it possible to write a JIT in a generic way such that it'll work for a class of ISAs?
- nitrogen 5y ago
  You can write a JIT that generates C code and calls the system's C compiler: https://duckduckgo.com/?q=ruby+"MJIT" https://duckduckgo.com/?q=ruby+"MJIT"
  - gnulinux 5y ago
    Oh well I never thought of it, nor read of it. Need to go back to books. Thanks for sharing!
tenderlove 5y ago
It's x86-64 specific right now. I'm interested in adding ARM support so I'll do that at some point in the future. My desktop is x86-64 and our production machines are as well, which is why I started with it. Thanks for the interest!