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

[Joerg Sonnenberger]

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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>