Nto working:

Disassembly of section .text._ZN4rpnx10dtb_readeraSERKS0_:

0000000041002510 <_ZN4rpnx10dtb_readeraSERKS0_>:
41002510: ff 43 00 d1   sub     sp, sp, #16
41002514: e0 07 00 f9   str     x0, [sp, #8]
41002518: e1 03 00 f9   str     x1, [sp]
4100251c: e0 07 40 f9   ldr     x0, [sp, #8]
41002520: e8 03 40 f9   ldr     x8, [sp]
41002524: 00 01 c0 3d   ldr     q0, [x8]
41002528: 00 00 80 3d   str     q0, [x0]
4100252c: ff 43 00 91   add     sp, sp, #16
41002530: c0 03 5f d6   ret

Working:

0000000041002510 <_ZN4rpnx10dtb_readeraSERKS0_>:
41002510: ff 43 00 d1   sub     sp, sp, #16
41002514: e0 07 00 f9   str     x0, [sp, #8]
41002518: e1 03 00 f9   str     x1, [sp]
4100251c: e0 07 40 f9   ldr     x0, [sp, #8]
41002520: e8 03 40 f9   ldr     x8, [sp]
41002524: 08 01 40 f9   ldr     x8, [x8]
41002528: 08 00 00 f9   str     x8, [x0]
4100252c: e8 03 40 f9   ldr     x8, [sp]
41002530: 08 05 40 f9   ldr     x8, [x8, #8]
41002534: 08 04 00 f9   str     x8, [x0, #8]
41002538: ff 43 00 91   add     sp, sp, #16
4100253c: c0 03 5f d6   ret