[Bug tree-optimization/96563] New: Failure to optimize loop with condition to simple arithmetic

[gabravier at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96563

            Bug ID: 96563
           Summary: Failure to optimize loop with condition to simple
                    arithmetic
           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: ---

int f(int x)
{
    int i = 0;
    while (i <= 9)
    {
        if (i == x)
            return 8;
        ++i;
    }
    return 4;
}

This can be optimized to `return 4 + ((x <= 9) * 4);`. This transformation is
done by LLVM, but not by GCC.