Susprising behavior of gcc on x86 (-m32)

Andrew Haley aph@redhat.com
Tue Sep 8 09:45:00 GMT 2015


On 09/08/2015 10:15 AM, Mathieu Malaterre wrote:
> What is even more surprising is that I can no longer reproduce the
> behavior using `valgrind` from my 32bits chroot.
> 
> I understand that my bug description is relatively small, but I am
> eager to report a more specific gcc issue. If anyone could help me
> narrow down this issue, I'd appreciate your comments.
> 
> Please note that that I disabled any kind of optimizations by using
> (explicitly!) -O0.

I'm guessing that it's some silliness with the FPU, but that's a wild
guess.

You first need to find out what part of the file is different, and
narrow it down from there.  One question: how well do you understand
the OpenJPEG code base?

Andrew.



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