Am Fri, 24 Jan 2014 11:12:36 +0000
schrieb "Mike" <n...@none.com>:
> That appears to be it. I added memory to the clobber list and it
> worked without any extra modifiers. And, my executable is now
> only 56 bytes. It still doesn't do anything useful, but it's
> small and optimized :-)
>
> Thanks so much for the information and the help.
>
You're welcome!
BTW: The optimizer generated this code for SendCommand
mov r3, r0 @ command, command
mov r2, r1 @ message, message
mov r0, r3; @ command
mov r1, r2; @ message
It's a little bit unfortunate that you can't specify in extended inline
asm that you want a specific register on ARM (on x86 you could tell gcc
to use e.g. eax for this variable). Otherwise you could use something
like
asm
{
"bkpt #0xAB"
:
: [cmd] "r0" command, [msg] "r1" message
: ;
};
and the compiler could avoid those useless moves.
