* config/pa/pa-linux.h (HAVE_sync_compare_and_swapdi): Define.
	* config/pa/pa-protos.h (pa_maybe_emit_compare_and_swap_exchange_loop):
	Declare.
	* config/pa/pa.c (pa_init_libfuncs): Init sync libfuncs up to 8 bytes.
	(pa_expand_compare_and_swap_loop): New.
	(pa_maybe_emit_compare_and_swap_exchange_loop): New.
	* config/pa/pa.md (atomic_storeqi, atomic_storehi, atomic_storesi,
	atomic_storesf, atomic_loaddf, atomic_storedf): New expanders.
	(atomic_loaddf_1, atomic_storedf_1): New insn patterns.
	(atomic_loaddi, atomic_loaddi_1, atomic_storedi, atomic_storedi_1):
	Revise.

From-SVN: r228104