https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96702

            Bug ID: 96702
           Summary: Failure to optimize comparisons involving result of
                    subtraction
           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, int b)
{
    int c = (a - b);
    return c >= a && c != 0;
}

This can be optimized to `return (b <= 0) && (a != b);`. This transformation is
done by LLVM, but not by GCC.

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