https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123343
--- Comment #13 from rguenther at suse dot de <rguenther at suse dot de> --- On Tue, 13 Jan 2026, chenzhongyao.hit at gmail dot com wrote: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123343 > > --- Comment #12 from Zhongyao Chen <chenzhongyao.hit at gmail dot com> --- > (In reply to Richard Biener from comment #10) > > Dump shows multi-lane SLP failed, but size-1 subgroup analysis "succeeded" > with > poor code generation. > > Shouldn't subgroups also require size > 1? I added a check and now size-1 > cases > fall back to single-lane reduction, which gives the expected asm. Can you elaborate / provide the added check as patch?
