* config/rs6000/rs6000.md (UNSPEC_SYNC, UNSPEC_LWSYNC,
        UNSPEC_ISYNC, UNSPEC_SYNC_OP, UNSPEC_ATOMIC, UNSPEC_CMPXCHG,
        UNSPEC_XCHG, UNSPEC_AND): New.
        (UNSPECV_ATOMIC, UNSPECV_SYNC, UNSPECV_SYNC_OP, UNSPECV_CMPXCHG,
        UNSPECV_LWSYNC, UNSPECV_ISYNC): Delete.
        * config/rs6000/sync.md (FETCHOP): New code macro.
        (fetchop_name, fetchop_pred, fetchopsi_constr, fetchopdi_constr):
        New code attrs.
        (memory_barrier, sync_internal): Use unspec instead of unspec_volatile.
        (sync_compare_and_swap<mode>): Same.
        (sync_lock_test_and_set<mode>): Same.
        (sync_<fetchop><mode>, sync_nand<mode>): Only use rs6000_emit_sync
        for QImode and HImode, and not PPC405.
        (sync_old_<fetchop><mode>, sync_old_nand<mode>): Same.
        (sync_new_<fetchop><mode>, sync_new_nand<mode>): Same.
        (sync_<fetchop>{si,di}_internal): New.
        (sync_nand{si,di}_internal): New.
        (sync_old_<fetchop>{si,di}_internal): New.
        (sync_old_nand{si,di}_internal): New
        (sync_new_<fetchop>{si,di}_internal): New.
        (sync_new_nand{si,di}_internal): New.
        (atomic_and{si,di}): New.
        (sync_new_nand{si,di}_internal): New.
        (atomic_and{si,di}): New.
        (sync_add<mode>_internal): Delete.
        (sync_addshort_internal): Use unspec instead of unspec_volatile.
        (sync_sub<mode>_internal): Delte.
        (sync_subshort_internal): New.
        (sync_andsi_internal): Use unspec instead of unspec_volatile.
        (sync_anddi_internal): Delete.
        (sync_boolsi_internal): Use unspec instead of unspec_volatile.
        (sync_booldi_internal): Delete.
        (sync_boolc<mode>_internal): Delete.
        (sync_boolcshort_internal): Use unspec instead of unspec_volatile.
        (sync_boolc<mode>_internal2): Delete.
        (sync_boolcc<mode>_internal): Delete.
        (isync, lwsync): Use unspec instead of unspec_volatile.
        * config/rs6000/rs6000.c (rs6000_emit_sync): Implement MINUS.
        Revert UNSPEC_VOLATILE.
        (rs6000_split_atomic_op): New.
        * config/rs6000/rs6000-protos.h (rs6000_split_atomic_op): Declare.

From-SVN: r102049