[llvm-bugs] [Bug 40705] New: significant performance drop compared to G++

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=40705

            Bug ID: 40705
           Summary: significant performance drop compared to G++
           Product: new-bugs
           Version: unspecified
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: leonardoizzi96 at icloud.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

Created attachment 21472
  --> https://bugs.llvm.org/attachment.cgi?id=21472&action=edit
These are the benchmarks from Apple's clang++, clang++ bundled with LLVM 7 and
G++8

Hello.

I've noticed that when compiling the ReaderWriterQueue project
(https://github.com/cameron314/readerwriterqueue) with clang++, there a ~50%
drop in performance compared to the results I get with G++ 8.
In attachment you can find the results from the benchmark I've run.

I tried both with the clang++'s version bundled in Xcode and the one available
from your site and I got the same results.

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