http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59597
Bug ID: 59597 Summary: Performance degradation on Coremark after r205074 Product: gcc Version: 4.9.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: izamyatin at gmail dot com Target: x86 Created attachment 31510 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31510&action=edit reduced test Degradation could be seen at -Ofast for the attached test which similar to the Coremark codes It seems that jump threading here performs unnecessary nodes duplication and as a result if-conversion doesn't happen.