{% elsif flag?(:x86_64) %}
       asm("
         pushq %rdi
         pushq %rbx
         stmdb  sp!, {r0, r4-r11, lr}
         str    sp, [$0]
         ldr    sp, [$1]
         ldmia  sp!, {r0, r4-r11, lr}
         mov    r1, lr
         mov    lr, #0
         mov    pc, r1
         "
               :: "r"(current), "r"(to))
{% end %}