x64/memtst.s

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   4 global memtst_back
   5 memtst_back:
   6         mov     rax, rbp
   7 bt_up:  cmp     rdi, 0
   8         jle     bt_out
   9         test    rax, rax
  10         jz      bt_out
  11         mov     rax, [rax]
  12         dec     rdi
  13         jmp     bt_up
  14 bt_out: test    rax, rax
  15         jz      bt_ret
  16         add     rax, 8
  17         mov     rax, [rax]
  18 bt_ret: ret