https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110490
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Component|testsuite |tree-optimization Ever confirmed|0 |1 Last reconfirmed| |2023-06-29 Keywords| |missed-optimization Status|UNCONFIRMED |NEW --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- So the problem is a missing optimization. In this case, arch14 (which enables TARGET_EXTIMM) only defines a clzdi2 and not a clzsi2 so the code in build_cltz_expr does not realize that it could still support clzsi2 ...