Panasonic PanaXSeries MN1030 Series User Manual page 70

Chapter 4 Optimization
Example: subroutine call converted to a relative branch
This section gives an example of a CALLS LABEL instruction with a target address within the range of
a relative jump--that is, between -32,768 and +32,767 from the current program counter.
The source list is as follows.
_TEXT
sub_func
addr_set
func_end
The final list file after assembly is shown next. Since the CALLS LABEL instruction in line four con-
tains a target address that may be expressed with a 2-byte relative branch, the assembler replaces it with
the CALLS LABEL variant with a 2-byte address field. Note that the mnemonics and object code are
different.
***
Loc Object
40000000
40000000 FAFF8000
40000080
40000080 F0FC
*** Symbol Table
40000000
40000000
40000080
58 Usage Example
opt
section
calls
org
rts
end
opt4.lst Page 1
PanaX series Series MN1030 Cross Assembler
Line Source
1
2 _TEXT
3 sub_func
@4 addr_set
5
6
7 func_end
8
9
opt4.lst Page 2
***
T sub_func
T addr_set
T func_end
on
CODE, PUBLIC,1
func_end
addr_set+128
***
opt on
section CODE, PUBLIC, 1
Calls func_end
org addr_set+128
rts
end