On Mon, 26 Nov 2018 00:45:26 +0100 Carl Eugen Hoyos <ceffm...@gmail.com> wrote:
> 2018-11-25 16:17 GMT+01:00, Lauri Kasanen <c...@gmx.com>: > > Hi, > > > > The lone power8 fate failing test seems like an aliasing issue. > > I've isolated it into the attached standalone test case. Compiling it > > with > > gcc -std=c11 -maltivec -mabi=altivec -mvsx -O3 -fno-tree-vectorize > > -o test test.c > > > > reproduces on gcc 8.2.0, dropping the optimization level fixes it. This > > was one of the "adding a printf made it work" things too. > > > > -Wstrict-aliasing=1 complains about the "register int *idataptr = > > (int*)dataptr;" cast. If I put "typedef int __attribute__((may_alias)) > > int_alias;" at the top and change the cast and type to int_alias, the > > results become correct. > > Thank you for the analysis! > > Patch attached, Carl Eugen Tested, fixes the fate test for me. - Lauri _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel