[llvm-bugs] [Bug 39717] New: AArch64 MachineOutliner causes performance regression on Firefox

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39717

            Bug ID: 39717
           Summary: AArch64 MachineOutliner causes performance regression
                    on Firefox
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: mh+llvm at glandium.org
                CC: htmldeveloper at gmail.com, jpaquette at apple.com,
                    llvm-bugs at lists.llvm.org

Upgrading from Clang 6 to Clang 7 made Firefox for Android performance
regression on aarch64, noticeable as a ~2.5% regression on the speedometer
benchmark.

After bisection, I found that the cause of the regression is
https://github.com/llvm-mirror/llvm/commit/031332e78887f4658e2d7a2f7541827c2ca9baf5,
and building with clang 7 with that patch reverted does bring the speedometer
score to what it was with clang 6.

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