Elevator achieves performance on par with or better than QEMU's user-mode JIT emulation.
QEMU is a weird pick here. Why not FEX?
Why is it "weird"? It has been around much longer AFAIK.
Because fex/box86 have the ability to run arm binaries linked to x86 libraries, netting signficantly greater performance. In addition to other tricks.
https://box86.org/2022/03/box86-box64-vs-qemu-vs-fex-vs-rosetta2/
What's the point of this when you can compile between ISAs using a build tool and source? When would you need to cross compile a binary after building?
Because you don't have the source or because you can't configure the cross-compiler
I guess I'm confused about the context you'd be in that situation.
Easy to explain: The idiot project manager skipped to set up source control, and the sources have been lost.
E.g. when you have a proprietary program that is only available on x86, but you want to run it on ARM.
I think there will be cases that do not work. For example, default memory access semantics of multi-threaded code are different for x86 compared to ARM - the code likely contains assumptions that are not valid on ARM.
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