[Bug tree-optimization/96708] New: Failure to optimize max pattern with comparison when using a temporary variable

[gabravier at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96708

            Bug ID: 96708
           Summary: Failure to optimize max pattern with comparison when
                    using a temporary variable
           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 tmp = (a < b) ? b : a;
    return tmp >= a;
}

This can be optimized to `return true;`. This transformation is done by LLVM,
but not by GCC.

PS: This is probably related to
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95926.