https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95246
Bug ID: 95246 Summary: Failure to optimize comparison between differently signed chars 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(unsigned char a, signed char b) { return a > b; } This can be optimized to `return (signed char)a > b;`. This transformation is done by LLVM, but not by GCC.