[x264-devel] Re: [BUG] bus error on Solaris

[Zhe Zheng]

You'll get bus error when you access unaligned pointers. like when you
access an integer pointer which is not 4 byte aligned. And gcc3 on sparc is
very buggy, you should really disable all optimization.



On 10/6/06, Christian Bienia <cbienia at cs.princeton.edu> wrote:
>
> Hi,
>
> despite all my efforts, I haven't been able to find the bug so far. :-(
> But it might be that gcc is generating incorrect Sparc code. Here's what
> I've tried:
>
> - Blastwave's gcc4: bug always shows up.
> - Sun's preinstalled gcc3: bug only shows up if the optimizer is
> enabled. x264 works fine if compiled with -O0.
> - CoolTools gcc (gcc4 frontend + Sun's cc backend): x264 works fine (!)
>
> Depending on the optimization level (x264 uses -O1 as debug default, I
> also tried -O0), the segfault occurs at different places in the code,
> but always somewhere in assembly code for which the compiler cannot show
> any C code (such as the PLT case I described in my earlier email).
>
> I suspect that the gcc Sparc backend generates incorrect code. In any
> case, only p8x8 partitions seem to be affected, and x264 runs without
> problems if they're deactivated.
>
> What do you guys think about that?
>
> - Chris
>
> --
> This is the x264-devel mailing-list
> To unsubscribe, go to: http://developers.videolan.org/lists.html
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.videolan.org/pipermail/x264-devel/attachments/20061024/f38af7de/attachment.htm