[Bug middle-end/55481] New: [4.8 regression] -O2 generates a wrong-code infinite loop in C++Benchmark's simple_types_constant_folding int8 xor test

[matt at use dot net]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55481



             Bug #: 55481

           Summary: [4.8 regression] -O2 generates a wrong-code infinite

                    loop in C++Benchmark's simple_types_constant_folding

                    int8 xor test

    Classification: Unclassified

           Product: gcc

           Version: 4.8.0

            Status: UNCONFIRMED

          Severity: blocker

          Priority: P3

         Component: middle-end

        AssignedTo: unassig...@gcc.gnu.org

        ReportedBy: m...@use.net





With current trunk at -O2, the attached preprocessed code emits what appears to

be an infinite loop (linux/x64 binaries also attached). GCC 4.7 at -O2 and GCC

4.8 ant -O[13] do not exhibit the problem. I tried adding individual flags to

-O1 to narrow the problem but wasn't able to reproduce.