[LLVMdev] "grep -w" irregularity

[Scott Michel]

Misha:

It's not like I can ssh into the x86_64 buildbot, so I really can't  
tell. All I can tell is that I get blamed for a failed build.


-scooter

On Dec 30, 2008, at 4:55 PM, Misha Brukman wrote:

> 2008/12/30 Scott Michel <scottm at aero.org>
> Not entirely sure how to categorize this particular problem, but it's
> clearly platform test related: "grep -w" appears to operate
> differently on the x86_64 linux buildbot versus my local Mac OS
> 10.4.11 and Ubuntu x86_64. In the CellSPU's shift_ops.ll test case,
> "grep -w shlh" returns the correct 9 expected occurances, whereas the
> x86_64 buildbot finds 10.
>
> Does the asm output differ, or does grep output itself differ on  
> these two platforms, with the same asm input file?  I just took  
> the .s output file from a run on an x86/Linux box, and tested it  
> with grep on multiple systems, including the ones you list, and  
> they all agree the answer is 9.
>
> Can you diff the assembly files generated on those two platforms  
> (though they should be identical, since llc specifies the  
> architecture)?
>
> Any suggestions for a workaround, other than to ditch using "grep -w"?
>
> Personally, I think that testing as we have for optimization  
> correctness via 'grep' should be replaced by unittests, which are  
> much more precise.
>
> Misha
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