[llvm-bugs] [Bug 34339] New: std::copy does not optimise for reverse_iterator.

via llvm-bugs llvm-bugs at lists.llvm.org
Sun Aug 27 13:46:34 PDT 2017


            Bug ID: 34339
           Summary: std::copy does not optimise for reverse_iterator.
           Product: libc++
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: denis.yaroshevskij at gmail.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

std::copy could unroll 3 reverse_iterators into copy_backward and than do a
Example: https://godbolt.org/g/G6NWRG

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