Maciej W. Rozycki wrote:
> On Fri, 19 Sep 2003, Thiemo Seufer wrote:
> > > > A third answer is to add a -msign-extend-addresses switch in the
> > > > assembler.
> > > > Together with -mabi=64 this would produce optimized ELF64 output.
> > >
> > > Hmm, what do you exactly mean -- is that what I am worrying about?
> > The idea is to use the assembler's 32bit macro expansions for addresses.
> So it is...
> > This reduces the .text size of a n64 kernel and improves the performance,
> > without tricks like -Wa,32.
> What if the final link leads to segments being mapped outside the 32-bit
> address range? We won't know about it when assembling.
Then the resulting code is broken. It's the programmers responsibility
to care about it. IMHO that's not a problem, this feature is only
useful for kernels, and the tricks currently done there are worse.
> If the idea were to be implemented, there should be a flag added to the
> header of object files that would forbid the linker to map addresses
> outside the 32-bit range.
Please don't add any header flag. An additional (.note?) section would
be nice, but is not a priority for me.