include/
	* xtensa-config.h (XCHAL_HAVE_THREADPTR): New.
	(XCHAL_HAVE_RELEASE_SYNC, XCHAL_HAVE_S32C1I): New.
gcc/
	* config/xtensa/xtensa.c (xtensa_expand_mask_and_shift): New.
	(struct alignment_context, init_alignment_context): New.
	(xtensa_expand_compare_and_swap, xtensa_expand_atomic): New.
	* config/xtensa/xtensa.h (XCHAL_HAVE_RELEASE_SYNC): Add default.
	(XCHAL_HAVE_S32C1I): Likewise.
	(TARGET_RELEASE_SYNC, TARGET_S32C1I): New.
	* config/xtensa/xtensa.md (UNSPECV_MEMW): New constant.
	(UNSPECV_S32RI, UNSPECV_S32C1I): Likewise.
	(ATOMIC, HQI): New macros.
	(memory_barrier, *memory_barrier): New.
	(sync_lock_releasesi): New.
	(sync_compare_and_swapsi, sync_compare_and_swap<mode>): New.
	(sync_lock_test_and_set<mode>): New.
	(sync_<atomic><mode>): New.
	(sync_old_<atomic><mode>, sync_new_<atomic><mode>): New.
	* config/xtensa/xtensa-protos.h (xtensa_expand_compare_and_swap): New.
	(xtensa_expand_atomic): New.
gcc/testsuite/	
	* lib/target-supports.exp (check_effective_target_sync_int_long):
	Enable for xtensa.
	(check_effective_target_sync_char_short): Likewise.

From-SVN: r126728