[FFmpeg-devel] [PATCH] configure: disable the new optimizer in Visual Studio 2015 Update 3

Hendrik Leppkes h.leppkes at gmail.com
Tue Jun 28 12:01:54 CEST 2016

On Tue, Jun 28, 2016 at 11:48 AM, Hendrik Leppkes <h.leppkes at gmail.com> wrote:
> Visual Studio 2015 Update 3 introduced a new SSA optimizer, however
> it unfortunately causes miscompilations. Until it is fixed, the new
> optimizations are disabled and should be re-checked on subsequent
> compiler releases.
> Fixes recent FATE failure of fate-lavf-pam on VS2015.

On that note, i'm not exactly sure which code actually miscompiles.
I though its pamenc, but the generated files are identical, then I
though its the crc computing code (crcenc/adler32), but those seem
fine as well and would likely screw up in more then one case if they
would miscompile.

So that leaves pnmdec, I suppose, but I didn't make much headway to
poke around in that. If anyone has any handy hints how to find the
code in question that might be helpful.
Maybe the code is actually not-quite-right and might enjoy some straigtening.

- Hendrik

More information about the ffmpeg-devel mailing list