Panasonic MN1030 user manual Opt

Chapter 4 Optimization

Example: branch destination of conditional branch instruction within range

This example shows a branch in the permitted range (-128 to 127 of PC) of a BCC LABEL conditional branch instruction.

The source list is as follows.

	opt	on
_TEXT	section	CODE, PUBLIC,1
sub_func	mov	0, D2
	cmp	D1, D2
addr_set	bcc	func_end
func_end	org	addr_set+127
	rts
	end

The final list file after assembly is shown next. The start address during linking is assumed to be 40000000 (hex.). The @ mark on line number 6 indicates that the instruction was the object of optimi- zation. Since the target address is within the range of a relative jump, the assembler generates a BCC LABEL instruction.

			opt1.lst Page 1
Loc	*** PanaX series Series MN1030 Cross Assembler ***
	Object	Line	Source	opt	on
		1	_TEXT
40000000		2			section CODE, PUBLIC, 1
	8A00	3	sub_func	mov	0, D2
40000000		4
40000002	A6	5	addr_set	cmp	D1, D2
40000003	C67F	@6		bcc	func_end
		7		org	addr_set+127
40000082		8	func_end
	F0FC	9		rts
40000082		10
		11		end
			opt1.lst Page 2

*** Symbol Table	***
40000000	T	sub_func
40000003	T	addr_set
40000082	T	func_end

Usage Example 55