[Bug tree-optimization/57534] [6/7/8 Regression]: Performance regression versus 4.7.3, 4.8.1 is ~15% slower

[law at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57534

--- Comment #17 from Jeffrey A. Law <law at redhat dot com> ---
It could well end up being a case where we need to look to see if the
expressions are likely to CSE to determine which is better.

I'm not sure if reassoc has that kind of capability.