http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36352
Jan Hubicka <hubicka at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |hubicka at gcc dot gnu.org,
| |jakub at redhat dot com
--- Comment #2 from Jan Hubicka <hubicka at gcc dot gnu.org> 2010-11-10
18:17:15 UTC ---
We are not able to declare the var as readonly since we think that it might be
accessed by other module.
This is not true for local static of comdats as we know what that comdat does
with the function, but it is bit difficult to take advantage of this because we
see code after optimization and it is possible that we optimized away the
access in this unit but not in other.
Only way I see to handle this safely is to have ipa-reference done before early
optimization. I tried that some time ago and I know it broke thread local
storage because it does part of job at gimplification and part of job
afterwards leading to confusion when var becomes read only (it stays accessed
as thread local but it is not brought thread local by the later pass). This is
lost optimization.
Jakub, Richard, perhaps the rewrite made this possible? It would be nice
cleanup.
