https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109982
Alexander Monakov <amonakov at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |amonakov at gcc dot gnu.org --- Comment #8 from Alexander Monakov <amonakov at gcc dot gnu.org> --- Also reproducible with -march=haswell, and works with -mmove-max=128 -mstore-max=128 -mtune-ctrl=^sse_unaligned_store_optimal added. I would guess the real culprit is commit r12-2666-g29f0e955c97 ("x86: Update piecewise move and store") like in PR 109780.