[Llvm-bgq-discuss] Hitting assertion during compilation

[Hal Finkel]

Dan, et al.,

Thanks for the test case. There has been some upstream work to enable the "fast instruction selector" for PowerPC; this is apparently not playing well with something here, and I've updated the wrapper scripts to disable it. This is only used at -O0, so you're compiling without any optimizations enabled (if you were getting miscompiles in the past, you should try again with the new build).

There is an updated (v2) archive on the trac page for those with their own installs: https://trac.alcf.anl.gov/projects/llvm-bgq

 -Hal

----- Original Message -----
> Hi Hal,
> 
> Thanks for the quick response. I dropped the relevant files in
> ~dschatz/forhal
> Let me know if I got the permissions right and you can access the
> stuff in there.
> 
> I did a little more investigating and I noticed that indeed the same
> source file builds with the previous compiler release. Let me know if
> there is anything else I can do to help.
> ---
> Dan Schatzberg
> 
> 
> On Tue, Aug 27, 2013 at 4:32 PM, Hal Finkel <hfinkel at anl.gov> wrote:
> > ----- Original Message -----
> >> Dan,
> >>
> >> Can you please point me to the source files? (normally, when
> >> hitting
> >> a crash like this, the compiler produces a preprocessed source
> >> file
> >> and a build script, do you have those?)
> >
> > And yes, I just updated the install today.
> >
> >  -Hal
> >
> >>
> >> Thanks,
> >> Hal
> >>
> >> ----- Original Message -----
> >> > Hi,
> >> >
> >> > I've been using the clang port to blue gene/q for its c++11
> >> > features.
> >> > While working on my software today I started to hit an assertion
> >> > during compilation:
> >> >
> >> > clang:
> >> > /gpfs/vesta-home/hfinkel/src/llvm-trunk/lib/CodeGen/LiveVariables.cpp:133:
> >> > void llvm::LiveVariables::HandleVirtRegUse(unsigned int,
> >> > llvm::MachineBasicBlock*, llvm::MachineInstr*): Assertion
> >> > `MRI->getVRegDef(reg) && "Register use before def!"' failed.
> >> >
> >> > It happens on a number of source files which I believe I was
> >> > able
> >> > to
> >> > compile just fine earlier today. I get a back trace and other
> >> > information which I can upload to the mailing list if its
> >> > useful.
> >> >
> >> > Did anything change with the installed version of clang today?
> >> > Please
> >> > let me know how I can help.
> >> >
> >> > ---
> >> > Dan Schatzberg
> >> > _______________________________________________
> >> > llvm-bgq-discuss mailing list
> >> > llvm-bgq-discuss at lists.alcf.anl.gov
> >> > https://lists.alcf.anl.gov/mailman/listinfo/llvm-bgq-discuss
> >> >
> >>
> >> --
> >> Hal Finkel
> >> Assistant Computational Scientist
> >> Leadership Computing Facility
> >> Argonne National Laboratory
> >> _______________________________________________
> >> llvm-bgq-discuss mailing list
> >> llvm-bgq-discuss at lists.alcf.anl.gov
> >> https://lists.alcf.anl.gov/mailman/listinfo/llvm-bgq-discuss
> >>
> >
> > --
> > Hal Finkel
> > Assistant Computational Scientist
> > Leadership Computing Facility
> > Argonne National Laboratory
> 

-- 
Hal Finkel
Assistant Computational Scientist
Leadership Computing Facility
Argonne National Laboratory