operation
	:	OP_impl
			{	emit1($1);}
	|	OP_branch expr
			{	branch($1, $2);}
	|	OP_arithm SIZE '#' expr
			{	encode_imm($1+0x9, $2, $4);}
	|	OP_arithm SIZE expr
			{	emit1($1+0x0D);}
	|	OP_arithm SIZE expr ',' REG_x
			{	emit1($1+0x1D);}
	|	OP_arithm SIZE expr ',' REG_y
			{	emit1($1+0x19);}
	|	OP_arithm SIZE '(' expr ',' REG_x ')'
			{	emit1($1+0x01);}
	|	OP_arithm SIZE '(' expr ')' ',' REG_y
			{	emit1($1+0x11);}
	|	OP_jump expr
			{	emit1($1);}
	|	OP_jump '(' expr ')'
			{	emit1($1+0x20);}
	|	OP_jsr expr
			{	emit1($1);}
	|	OP_rol REG_acc
			{	emit1($1+0x0A);}
	|	OP_rol SIZE expr
			{	emit1($1+0x0E);}
	|	OP_rol SIZE expr ',' REG_x
			{	emit1($1+0x1E);}
	|	OP_bit SIZE expr
			{	emit1($1);}
	|	OP_cpx SIZE '#' expr
			{	emit1($1);}
	|	OP_cpx SIZE expr
			{	emit1($1+0x0C);}
	|	OP_inc SIZE expr
			{	emit1($1+0x0E);}
	|	OP_inc SIZE expr ',' REG_x
			{	emit1($1+0x1E);}
	|	OP_stx SIZE expr
			{	emit1($1);}
	|	OP_ldx SIZE '#' expr
			{	emit1($1);}
	|	OP_ldx SIZE expr	
			{	emit1($1+0x0C);}
	|	OP_ldx SIZE expr ',' REG_x
			{	emit1($1+0x1C);}
	;