// ASM stream — symbol operand (`"s"`): feed a function/global SYMBOL into the
// template so a DIRECT `bl %[fn]` (PC-relative — one fewer indirection than a
// register-indirect `blr`: no pointer load, a relative reloc, a predictable
// branch) goes straight to it. The backend emits the platform-mangled name
// (`_cb` on macOS, `cb` on Linux), so the template stays portable — no hardcoded
// underscore. Round trip: sx → asm → `bl _cb` → sx → 42. aarch64-macos-pinned;
// runs under the JIT here, ir-only elsewhere (the `.ir` locks `"s"`/`ptr @cb`).
cb :: (n: i64) -> i64 export "cb" { return n + 1; }

tramp :: (n: i64) -> i64 {
    return asm volatile {
        #string ASM
        stp x29, x30, [sp, #-16]!
        mov x0, %[arg]
        bl %[fn]
        mov %[res], x0
        ldp x29, x30, [sp], #16
ASM,
        [res] "=r" -> i64,
        [arg] "r" = n,
        [fn]  "s" = cb,             // symbol operand → direct `bl _cb`
        clobbers(.x0, .x30, .memory),
    };
}
main :: () -> i64 { return tramp(41); }