[llvm-dev] [PowerPC] Recent branch too far breakage
Hal Finkel via llvm-dev
llvm-dev at lists.llvm.org
Wed Sep 7 05:40:00 PDT 2016
----- 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
> >
> > _______________________________________________
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> > 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
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