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Reading symbols from tmp_install/usr/local/pgsql/bin/postgres...
(gdb) Dump of assembler code for function pgaio_io_was_recycled:
558		*state = ioh->state;
   0x0000000000436f98 <+0>:	lbu	a3,0(a0)
   0x0000000000436f9c <+4>:	sw	a3,0(a2)

559	
560		/*
561		 * Ensure that we don't see an earlier state of the handle than ioh->state
562		 * due to compiler or CPU reordering. This protects both ->generation as
563		 * directly used here, and other fields in the handle accessed in the
564		 * caller if the handle was not reused.
565		 */
566		pg_memory_barrier();
   0x0000000000436f9e <+6>:	fence	rw,rw

567	
568		return ioh->generation != ref_generation;
   0x0000000000436fa2 <+10>:	ld	a0,64(a0)
   0x0000000000436fa4 <+12>:	xor	a0,a0,a1
   0x0000000000436fa6 <+14>:	snez	a0,a0
   0x0000000000436faa <+18>:	ret

End of assembler dump.
(gdb)