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); encode_addr($3, $2);}
	|	OP_arithm SIZE expr ',' REG_x
			{	emit1($1+0x1D); encode_addr($3, $2);}
	|	OP_arithm SIZE expr ',' REG_y
			{	emit1($1+0x19); encode_addr($3, $2);}
	|	OP_arithm SIZE '(' expr ',' REG_x ')'
			{	emit1($1+0x01); encode_addr($4, $2);}
	|	OP_arithm SIZE '(' expr ')' ',' REG_y
			{	emit1($1+0x11); encode_addr($4, $2);}
	|	OP_jump expr
			{	emit1($1); encode_addr($2, 0);}
	|	OP_jump '(' expr ')'
			{	emit1($1+0x20); encode_addr($3, 0);}
	|	OP_jsr expr
			{	emit1($1); encode_addr($2, 0);}
	|	OP_rol REG_acc
			{	emit1($1+0x0A);}
	|	OP_rol SIZE expr
			{	emit1($1+0x0E);encode_addr($3, $2);}
	|	OP_rol SIZE expr ',' REG_x
			{	emit1($1+0x1E);encode_addr($3, $2);}
	|	OP_bit SIZE expr
			{	emit1($1);encode_addr($3, $2);}
	|	OP_cpx SIZE '#' expr
			{	encode_imm($1, $2, $4);}
	|	OP_cpx SIZE expr
			{	emit1($1+0x0C);encode_addr($3, $2);}
	|	OP_inc SIZE expr
			{	emit1($1+0x0E);encode_addr($3, $2);}
	|	OP_inc SIZE expr ',' REG_x
			{	emit1($1+0x1E);encode_addr($3, $2);}
	|	OP_stx SIZE expr
			{	emit1($1);encode_addr($3, $2);}
	|	OP_ldx SIZE '#' expr
			{	encode_imm($1, $2, $4);}
	|	OP_ldx SIZE expr	
			{	emit1($1+0x0C);encode_addr($3, $2);}
	|	OP_ldx SIZE expr ',' REG_x
			{	emit1($1+0x1C);encode_addr($3, $2);}
	;