[Bug tree-optimization/48702] [4.6/4.7 Regression] optimization regression with gcc-4.6 on x86_64-unknown-linux-gnu

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48702

--- Comment #24 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-05-25 13:58:20 UTC ---
(In reply to comment #22)
> Created attachment 24354 [details]
> alternative patch for 4.6
> 
> This is another patch - it avoids creating MEM_REFs for base addresses that
> we do not know whether they are always in bounds of the object it points to.
> Instead we force the use of TARGET_MEM_REFs there and dumb down the alias
> oracle to not assume that base address is within bounds.
> 
> Sounds like the most reasonable solution for 4.6 to me.

Requires staging on trunk, there are multiple small fixes that need backporting
and one last cleanup (and fix) that I had pending needs to be finished first.

But I'll continue in this direction.