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

[Hal Finkel via llvm-dev]

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?

 -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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