https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81555
--- Comment #3 from Marc Glisse <glisse at gcc dot gnu.org> --- (In reply to Dmitry Babokin from comment #2) > Hmmm, but this one is triggered at -O1, another only at -O2. -fno-tree-reassoc should help both. It is often a combination of optimizations that causes the bug. Reassoc is doing a good transformation, but it leaves wrong information around, which only matters if some other pass (rightfully) takes advantage of that information. Still, it was good to report both, and I expect we may add (a modified version of) both to the testsuite once this is fixed, thanks.
