[llvm-bugs] [Bug 40575] New: std::copy to memmove optimisation seems to not work.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40575

            Bug ID: 40575
           Summary: std::copy to memmove optimisation seems to not work.
           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 has an optimization to memmove but it doesn't seem to work:
https://gcc.godbolt.org/z/a6lvSm (no memmove)

I has real consequences:
libstdc++: http://quick-bench.com/vpLxYCWfverSzlWxFjwuXxELD8Q
libc++: http://quick-bench.com/kfsPjkSo79hHiy0ZVrMCn7wU6Xw

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