[llvm-bugs] [Bug 47886] New: Aggressive inlining on moving from clang 9 to clang 11

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https://bugs.llvm.org/show_bug.cgi?id=47886

            Bug ID: 47886
           Summary: Aggressive inlining on moving from clang 9 to clang 11
           Product: libraries
           Version: 11.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Common Code Generator Code
          Assignee: unassignedbugs at nondot.org
          Reporter: jeffr at radgametools.com
                CC: llvm-bugs at lists.llvm.org

We're moving a lot of targets over to the new clang, and the inliner is
massively more aggressive now.  In general, we're seeing a 15% size increase
(x86, x64, arm and arm64).  

The choices seem to be kind of nuts - large functions (well over 1K) that are
used 8 times in a single obj get inlined all 8 times. 

Is there any fine grained control over this besides turning everything off and
then adding manual inline overrides?  Are there any docs on the new decisions? 
In addition to the size increase, this impacts our performance too (which we
keep close tabs on).

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