"Maciej W. Rozycki" <macro@ds2.pg.gda.pl> writes:
> Where did you get extraneous registers for the i386
> from (especially given the usual register shortage there)?
%gs
> Maybe we could use the same approach for MIPS.
I doubt it.
> Where to look for the code in glibc in a current snapshot?
%gs is used for a long time linuxthreads/sysdeps/386/useldt.h
> One possible approach is to reserve GOT entries for thread registers.
> While not as fast as CPU's registers, if frequently accessed they would
> stick in the cache. Since the ABI mandates the code to keep a pointer to
> the GOT in the gp register, accesses to got entries need only a single
> instruction. I haven't thought on it much -- someone might have a better
> idea.
How would you have different values for different threads? It would
mean having multiple GOTs which is a resource waste and a nightmare in
resource management.
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