Panasonic MN1030 Example: branch destination of conditional branch instruction within range

Chapter 4 Optimization

Usage Example 55

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.

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.

opt on

_TEXT section CODE, PUBLIC,1

sub_func mov 0, D2

cmp D1, D2

addr_set bcc func_end

org addr_set+127

func_end rts

end

opt1.lst Page 1

*** PanaX series Series MN1030 Cross Assembler ***

Loc Object Line Source

1 opt on

2 _TEXT section CODE, PUBLIC, 1

40000000 3 sub_func

40000000 8A00 4 mov 0, D2

40000002 A6 5 cmp D1, D2

40000003 C67F @6 addr_set bcc func_end

8 org addr_set+127

40000082 9 func_end

40000082 F0FC 10 rts

11 end

opt1.lst Page 2

*** Symbol Table ***

40000000 T sub_func

40000003 T addr_set

40000082 T func_end