https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96782
Bug ID: 96782 Summary: Failure to optimize comparison with bitwise not-ed with self Product: gcc Version: 11.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: gabravier at gmail dot com Target Milestone: --- bool f(int a) { return a == ~a; } This can be optimized to `return false;`. This transformation is done by LLVM, but not by GCC.