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: unassignedb...@nondot.org
Reporter: mh+l...@glandium.org
CC: htmldevelo...@gmail.com, jpaque...@apple.com,
llvm-bugs@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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