Embedded development, #define A B

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4

asm! can allocate registers (it’s right in the example on the linked page). LLVM will pick a register it isn’t using for the moment and can optimize with that information.

core::arch::asm!(
    "mov x, {tmp}",
    tmp = out(reg) _,
);

(I’m not completely sure reg is the right register class here, it depends on your use case)
If you need specifically el2 for some reason:

core::arch::asm!(
    "mov x, {tmp}",
    tmp = out("el2") _,
)
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