[NDS32] Optimize movmem and setmem operations.

[NDS32] Optimize movmem and setmem operations.

gcc/
	* config/nds32/nds32-intrinsic.md (unaligned_storedi): Modify patterns
	implementation.
	(unaligned_store_dw): Ditto.
	* config/nds32/nds32-memory-manipulation.c
	(nds32_expand_movmemsi_loop_known_size): Refactoring implementation.
	(nds32_gen_dup_4_byte_to_word_value): Rename to ...
	(nds32_gen_dup_4_byte_to_word_value_aux): ... this.
	(emit_setmem_word_loop): Rename to ...
	(emit_setmem_doubleword_loop): ... this.
	(nds32_gen_dup_4_byte_to_word_value): New function.
	(nds32_gen_dup_8_byte_to_double_word_value): New function.
	(nds32_expand_setmem_loop): Refine implementation.
	(nds32_expand_setmem_loop_v3m): Ditto.
	* config/nds32/nds32-multiple.md (unaligned_store_update_base_dw): New
	pattern.

Co-Authored-By: Chung-Ju Wu <jasonwucj@gmail.com>
From-SVN: r260805