* config/ia64/ia64.c (ia64_expand_op_and_fetch): Fix comment.
	(ia64_expand_compare_and_swap): Use always DImode ar.ccv,
	zero extend old to it.
	* config/ia64/ia64.md (cmpxchg_acq_si): Remove mode from ccv
	operand.

	* gcc.dg/ia64-sync-3.c: New test.

From-SVN: r64895