mips.h (MOVE_MAX): Use UNITS_PER_WORD and describe MIPS-specific implementation details.

mips.h (MOVE_MAX): Use UNITS_PER_WORD and describe MIPS-specific implementation details.

gcc/
	* config/mips/mips.h (MOVE_MAX): Use UNITS_PER_WORD and describe
	MIPS-specific implementation details.
	(MIPS_MAX_MOVE_BYTES_PER_LOOP_ITER): New macro.
	(MIPS_MAX_MOVE_BYTES_STRAIGHT): Likewise.
	(MOVE_RATIO): Define to MIPS_MAX_MOVE_BYTES_STRAIGHT / UNITS_PER_WORD
	for targets with movmemsi.
	(MOVE_BY_PIECES_P): Define.
	* config/mips/mips.c (MAX_MOVE_REGS, MAX_MOVE_BYTES): Delete.
	(mips_block_move_loop): Add a bytes_per_iter argument.
	(mips_expand_block_move): Use MIPS_MAX_MOVE_BYTES_STRAIGHT.
	Update call to mips_block_move_loop.

From-SVN: r129605