gcc/ChangeLog-dv-atomic-gcc7

	* (s390_expand_cs_hqi): Removed.
	(s390_expand_cs, s390_expand_atomic_exchange_tdsi): New prototypes.
	(s390_cc_modes_compatible): Export.
	* config/s390/predicates.md ("memory_nosymref_operand"): New predicate
	for compare-and-swap.
	* config/s390/s390.c(s390_emit_compare_and_swap): Handle all integer
	modes.
	(s390_cc_modes_compatible): Remove static.
	(s390_expand_cs_hqi): Make static.
	(s390_expand_cs_tdsi): Generate an explicit compare before trying
	compare-and-swap, in some cases.
	(s390_expand_cs): Wrapper function.
	(s390_expand_atomic_exchange_tdsi): New backend specific expander for
	atomic_exchange.
	* config/s390/s390.md (define_peephole2): New peephole to help
	combining the load-and-test pattern with volatile memory.
	("cstorecc4"): Deal with CCZmode too.
	("sne", "sneccz1_ne", "sneccz1_eq"): Renamed and duplicated pattern.
	("sneccz_ne", "sneccz_eq"): New.
	("atomic_compare_and_swap<mode>"): Merge the patterns for small and
	large integers.  Forbid symref memory operands.  Move expander to
	s390.c.
	("atomic_compare_and_swap<mode>_internal")
	("*atomic_compare_and_swap<mode>_1")
	("*atomic_compare_and_swap<mode>_2")
	("*atomic_compare_and_swap<mode>_3"): Forbid symref memory operands.
	("atomic_exchange<mode>"): Allow and implement all integer modes.
gcc/testsuite/ChangeLog-dv-atomic-gcc7

	* gcc.target/s390/md/atomic_compare_exchange-1.c: New test.
	* gcc.target/s390/md/atomic_compare_exchange-1.inc: New test.
	* gcc.target/s390/md/atomic_exchange-1.inc: New test.