[Bug other/24757] __sync_fetch_and_add on ia64

["pcarlini at suse dot de" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #3 from pcarlini at suse dot de  2005-11-09 17:45 -------
(In reply to comment #2)
> Hmm you said in:
> http://gcc.gnu.org/ml/libstdc++/2005-11/msg00149.html
> 
> That was really a glibc bug.

Exactly *was*. Ehi, do you think I'm stupid? Of course in the meanwhile
I have checked that the problem is present in machines equipped with
glibc2.3.5 and is not, on the same machines, for 4_0-branch.

> And actually 4.0 and before uses the builtins for ia64, this is where the
> builtins came from in the first place.

Exactly. But, given the glibc bug above, masking the gcc behavior well into
2005 for some of our machines, at least, isn't possible that when we switched
to builtins everywhere something got broken? Alternately, the ia64 builtins
themselves can be defective, but that seems much less likely to me, because
we are talking about a very consistent behavior for relatively simple usages
of one single mutex and one single atomic counter.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24757