http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59779
Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2014-03-13 Ever confirmed|0 |1 --- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Indeed, you're right, seems cddce1 removes the first loop when HOST_WIDE_INT is 32-bit. So, you really don't need -ftree-parallelize-loop=4 at all, the testcase would just abort at runtime. Looking into it.