[llvm-bugs] [Bug 26539] New: Strange x86(64) code performance

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=26539

            Bug ID: 26539
           Summary: Strange x86(64) code performance
           Product: libraries
           Version: 3.7
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: tulipawn at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Mandel-rust (https://github.com/willi-kappler/mandel-rust) benchmark produces
the following results:

https://gist.github.com/petevine/b70b6e5a434f23b40ab5

The strangeness stems from the fact fastest code is being produced for the
oldest architecture which also scales best.

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