nptl/pthread_spin_lock.s

   1 .globl pthread_spin_lock
   2 .type pthread_spin_lock,@function
   3 .align 1<<4
   4 pthread_spin_lock:
   5 1: LOCK
   6  decl 0(%rdi)
   7  jne 2f
   8  xor %eax, %eax
   9  ret
  10  .align 16
  11 2: rep
  12  nop
  13  cmpl $0, 0(%rdi)
  14  jg 1b
  15  jmp 2b
  16 .size pthread_spin_lock,.-pthread_spin_lock