[Bug tree-optimization/95821] New: Failure to optimize strchr to use memchr for string constant

[gabravier at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95821

            Bug ID: 95821
           Summary: Failure to optimize strchr to use memchr for string
                    constant
           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: ---

auto f(char c)
{
    return strchr("123", c);
}

This can be optimized to `return memchr("123", c, 4)`. This transformation is
done by LLVM, but not by GCC.