-O2/-O3 Optimization bug?

[Mike]

On Thursday, 23 January 2014 at 16:56:19 UTC, Johannes Pfau wrote:
> I think what could be happening here is that GCC doesn't know 
> what
> memory you're accessing via the message pointer in SendCommand.
>
> See http://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html
> and search for "If your assembler instructions access memory in 
> an
> unpredictable fashion"
>
> Maybe typing "message" as uint* or uint[3]* instead of void* is 
> already
> good enough. Otherwise try using a memory input as described on 
> that
> page.

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.

Mike