https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103641
--- Comment #17 from Andrew Pinski <pinskia at gcc dot gnu.org> --- My bet is r11-7153-ga11ef53238c8ebaab9a3f exposed the issue. That is the different cost model for the multiply exposed the compile time issue inside synth_mult (which I am not shocked based on PR 87256 and all).