2014-10-19  Adhemerval Zanella  <azanella@linux.vnet.ibm.com>
            David Edelsohn  <dje.gcc@gmail.com>

        * config/rs6000/rs6000.c (rs6000_atomic_assign_expand_fenv): New
        function.
        (TARGET_ATOMIC_ASSIGN_EXPAND_FENV): New define.
	* gcc.dg/atomic/c11-atomic-exec-5.c
	(test_main_long_double_add_overflow): Define and run only for
	LDBL_MANT_DIG != 106.
	(test_main_complex_long_double_add_overflow): Likewise.
	(test_main_long_double_sub_overflow): Likewise.
	(test_main_complex_long_double_sub_overflow): Likewise.

Co-Authored-By: David Edelsohn <dje.gcc@gmail.com>

From-SVN: r216437