[Bug binutils/29505] xxx-w64-mingw32-objdump takes a long time to scan pe binaries for debug information

[ralf.habacker at freenet dot de]

https://sourceware.org/bugzilla/show_bug.cgi?id=29505

--- Comment #7 from Ralf Habacker <ralf.habacker at freenet dot de> ---
(In reply to Nick Clifton from comment #6)
> (In reply to Ralf Habacker from comment #5)
> Hi Ralf,
> 
> > i686-w64-mingw32-objdump still needs about 30s to scan assistant-qt5.exe,
> > where it needs 2.8s when running on the host.
>  
> Sorry - I had not really grokked that this was a problem specific to the OBS
> build environment. 

> Based upon your comments in the opensuse ticket, this is a problem with
> unaligned memory access

>From the screenshot appended to the associated opensuse bug
https://bugzilla.opensuse.org/attachment.cgi?id=860901 it looks so.

The functions __memset_avx2_unaligned_erms and __memset_avx2_erms are involved.

>  and possibly specific to the OBS environment 

As written in the description of this bug I was able to reproduce this issue
also with a local chroot environment, so the issue is not obs specific.

> running an unoptimized version of memset.  

If that is what the above mentioned functions do, then yes. 

> If so are you able to enable profiling and find out which memset(s) are 
> taking all the time ?

You can see this at https://bugzilla.opensuse.org/attachment.cgi?id=860901

 __memset_avx2_erms takes about 90% of the execution time and is called from
__memset_avx2_unaligned_erms.




> 
> Cheers
>   Nick

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