This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug tree-optimization/77856] [7 Regression] wrong code at -O2 on x86_64-linux-gnu in 32-bit mode
- From: "vmakarov at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 25 Nov 2016 17:52:01 +0000
- Subject: [Bug tree-optimization/77856] [7 Regression] wrong code at -O2 on x86_64-linux-gnu in 32-bit mode
- Auto-submitted: auto-generated
- References: <bug-77856-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77856
--- Comment #3 from Vladimir Makarov <vmakarov at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #2)
> So, %ebx doesn't hold 1 as it is supposed to, but 1 << %ecx (64).
> Vlad, could you please have a look?
It is a bug in a new optimization (invariant inheritance) which I added this
summer.
The optimization is important for PPC. So it will take more time to fix it
than usual. Still ETA is the next week.