Epson S5U1C17001C, Manual

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S5U1C17001C ManUal
EPSOn
8-29
(C COMPilEr PaCkagE fOr S1C17 faMily) (Ver. 1.5.0)
8 aSSEMBlEr
8
Assemblr
notes
• When the
ext
instructions are written directly to an assembler source to extend basic instructions, they are
not optimized. When creating an assembler source, use
s
*
or
x
*
extended instructions for data transfer,
arithmetic operation, and branch if a symbol is used as the operand.
• If the branch destination symbol for a relative branch instruction is located in another section, the branch
instruction will not be optimized.
Example:
.text_A 0x00000000 :
{
__START_ text_A = . ;
sub_1.o(.text)
sub_2.o(.text)
sub_3.o(.text)
sub_4.o(.text)
__END_ text_A = . ;
}
.text_B 0x00C00000 :
{
__START_text_B = . ;
main.o(.text)
__END_ text_B = . ;
}
In this example, the extended instructions for referencing or branching to a symbol between "
main.o
" and
"
sub_ X .o
" will not be optimized. Therefore, new sections should not be added in the linker script file (
.lds
)
if they are not necessary.
• When a file name is described twice or more in a dump file (source files with the same name (except
extension and path) exist), optimization for local symbols using the dump file will not be performed. This
is not applied when the uppercase and lowercase letter configuration is different even if the file name is the
same. Furthermore, this condition does not affect optimization for global symbols using a map file.