[llvm] r232142 - [MachineCopyPropagation] Fix a bug causing incorrect removal for the instruction sequences as follows

[Tom Stellard]

Hi Evan, Tim,

Is this patch OK for the 3.6 branch?

http://llvm.org/viewvc/llvm-project?view=revision&revision=232142

Thanks,
Tom
On Mon, Mar 23, 2015 at 09:19:59AM +0800, Hao Liu wrote:
> Hi Joerg,
> 
> It's a bug fix. I think it's better to merge to branch 3.6.
> 
> Thanks,
> -Hao
> 
> 2015-03-14 1:47 GMT+08:00 Joerg Sonnenberger <joerg at britannica.bec.de>:
> > Tom? Tim?
> >
> > On Fri, Mar 13, 2015 at 04:34:14PM +0100, Arnaud A. de Grandmaison wrote:
> >> Yes, I think it is relevant for the 3.6 branch.
> >>
> >> Cheers,
> >> Arnaud
> >>
> >> -----Original Message-----
> >> From: llvm-commits-bounces at cs.uiuc.edu
> >> [mailto:llvm-commits-bounces at cs.uiuc.edu] On Behalf Of Joerg Sonnenberger
> >> Sent: 13 March 2015 16:14
> >> To: llvm-commits at cs.uiuc.edu
> >> Subject: Re: [llvm] r232142 - [MachineCopyPropagation] Fix a bug causing
> >> incorrect removal for the instruction sequences as follows
> >>
> >> On Fri, Mar 13, 2015 at 05:15:23AM -0000, Hao Liu wrote:
> >> > Author: haoliu
> >> > Date: Fri Mar 13 00:15:23 2015
> >> > New Revision: 232142
> >> >
> >> > URL: http://llvm.org/viewvc/llvm-project?rev=232142&view=rev
> >> > Log:
> >> > [MachineCopyPropagation] Fix a bug causing incorrect removal for the
> >> instruction sequences as follows
> >> >    %Q5_Q6<def> = COPY %Q2_Q3
> >> >    %D5<def> =
> >> >    %D3<def> =
> >> >    %D3<def> = COPY %D6     // Incorrectly removed in
> >> MachineCopyPropagation
> >> >    Using of %D3 results in incorrect result ...
> >> >
> >> >    Reviewed in http://reviews.llvm.org/D8242
> >>
> >> Is this relevant for the 3.6 branch?
> >>
> >> Joerg
> >> _______________________________________________
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> >> llvm-commits at cs.uiuc.edu
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> >>
> >>
> >>
> >>
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