[Bug tree-optimization/94920] New: Failure to optimize abs pattern from arithmetic with selected operands based on comparisons with 0

[gabravier at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94920

            Bug ID: 94920
           Summary: Failure to optimize abs pattern from arithmetic with
                    selected operands based on comparisons with 0
           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: ---

unsigned f(int x)
{
    return (x >= 0 ? x : 0) + (x <= 0 ? -x : 0);
}

This can be optimized to `return abs(x)`. LLVM does this transformation, but
GCC does not.