[llvm-bugs] [Bug 50087] New: Missing early return in std::partial_sort

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=50087

            Bug ID: 50087
           Summary: Missing early return in std::partial_sort
           Product: libc++
           Version: 11.0
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Standards Issues
          Assignee: unassignedclangbugs at nondot.org
          Reporter: hewillk at gmail.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

Hi, can we add an early return to std::partial_sort to avoid unnecessary O(n)
operations when __first is equal to __middle, just like std::rotate does?

https://godbolt.org/z/GfvzeT8Px

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