discover_flag_regs has bitrotted when rtl generation was changed to emit entire insns instead of patterns. Hence, any evaulation of the effectiveness of the regmove pass, or of the impact of changes to the regmove pass to generated code, is invalid, since the pass does not run at all.
-- Summary: regmove has been silently disabled Product: gcc Version: 4.3.0 Status: UNCONFIRMED Keywords: missed-optimization Severity: major Priority: P3 Component: rtl-optimization AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: amylaar at gcc dot gnu dot org OtherBugsDependingO 29842 nThis: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29858