[llvm-dev] [PowerPC] Recent branch too far breakage

[Hal Finkel via llvm-dev]

----- Original Message -----
> From: "Hal Finkel via llvm-dev" <llvm-dev at lists.llvm.org>
> To: "Richard Pennington" <rich at pennware.com>
> Cc: llvm-dev at lists.llvm.org
> Sent: Wednesday, September 7, 2016 7:37:50 AM
> Subject: Re: [llvm-dev] [PowerPC] Recent branch too far breakage
> 
> Hi Rich,
> 
> It is hard to tell, but there was a bug fix made to the branch
> relaxation code; perhaps the fix was not bug free -- Could this have
> been caused by r280626?

Is this a release or a debug build?

 -Hal

> 
>  -Hal
> 
> ----- Original Message -----
> > From: "Richard Pennington via llvm-dev" <llvm-dev at lists.llvm.org>
> > To: llvm-dev at lists.llvm.org
> > Sent: Wednesday, September 7, 2016 7:29:25 AM
> > Subject: [llvm-dev] [PowerPC] Recent branch too far breakage
> > 
> > I'm using a recent revision of TOT (280704) to build clang/LLVM for
> > PowerPC64 little endian. I'm getting an assembler error when
> > building
> > PPCInstPrinter.cpp:
> > 
> > The error is:
> > 
> > /tmp/PPCInstPrinter-84c835.s: Assembler messages:
> > /tmp/PPCInstPrinter-84c835.s:7671: Error: operand out of range
> > (0x0000000000008004 is not between 0xffffffffffff8000 and
> > 0x0000000000007ffc)
> > 
> > The offending line is the bne branch in this snippet:
> > 
> > .LBB24_787:
> >          ld 3, 16(29)
> >          ld 4, 24(29)
> >          sub      4, 4, 3
> >          rldicl 4, 4, 60, 4
> >          cmplwi 0, 4, 3
> >          bne      0, .LBB24_2630
> > 
> > Could this be because of a recent change in the PowerPC code
> > generator
> > or just because PPCInstPrinter.cpp changed a bit and exposed a
> > pre-existing bug?
> > 
> > 
> > -Rich
> > 
> > _______________________________________________
> > LLVM Developers mailing list
> > llvm-dev at lists.llvm.org
> > http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
> > 
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-- 
Hal Finkel
Assistant Computational Scientist
Leadership Computing Facility
Argonne National Laboratory