2011-11-29  Andrew MacLeod  <amacleod@redhat.com>

	PR target/50123
	* optabs.c (maybe_optimize_fetch_op): New.  Look for more optimal
	instructions for a FECTH_OP or OP_FECTH sequence.
	(expand_atomic_fetch_op): Call maybe_optimize_fetch_op.
	* testsuite/gcc.dg/atomic-op-optimize.c: New.  Test for optimizations.

From-SVN: r181815