http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54261
Bug #: 54261 Summary: reverse sync/atomic operators when only sync_compare_and_swap_optab libfuncs implemented Classification: Unclassified Product: gcc Version: 4.8.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: middle-end AssignedTo: unassig...@gcc.gnu.org ReportedBy: h...@gcc.gnu.org Target: cris*-*-linux-gnu If a target implements atomics by only setting sync_compare_and_swap_optab libfuncs (see cris.c:cris_init_libfuncs), a path less travelled is used, on which a bug lies, causing sync/atomic operators to be implemented with the reverse operator, e.g. minus instead of plus. See test-case to be added and patch to be posted and referenced.