On Tue, Sep 8, 2015 at 2:00 PM, Mathieu Malaterre <malat@xxxxxxxxxx> wrote: > FYI, > > On Tue, Sep 8, 2015 at 12:04 PM, Jonathan Wakely <jwakely.gcc@xxxxxxxxx> wrote: > [...] >> That's not the only option. You could compile one file with GCC and >> all others with Clang and see if you can reproduce it. Repeat for each >> file, which will narrow down the file where the problem occurs. Then >> you can try splitting that file into smaller pieces, with one function >> per file, and repeat the process. That would tell you which function >> or functions get miscompiled by GCC. > > Ok so if I compile eveything with gcc and then only `tcd.c` using > clang, then everything works as expected (no symptoms). > ref: https://github.com/uclouvain/openjpeg/blob/master/src/lib/openjp2/tcd.c > > I'll repeat your approach to find the culprit function. And the culprit function is `opj_tcd_makelayer`: https://github.com/uclouvain/openjpeg/blob/master/src/lib/openjp2/tcd.c#L218 Other than the `if (dd / dr >= thresh)` I do not see anything obviously suspicious.
