[Bug c++/85509] New: auto (function pointer) undermining inline expansion with GCC but not LLVM

[aaron_sami_abassi at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85509

            Bug ID: 85509
           Summary: auto (function pointer) undermining inline expansion
                    with GCC but not LLVM
           Product: gcc
           Version: 7.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: aaron_sami_abassi at hotmail dot com
  Target Milestone: ---

Created attachment 44010
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44010&action=edit
This code demonstrates the problem

The attached code when compiled with optimizations in LLVM (I'm using 5.0.0)
expands the call inline through the auto variables PerformQuickly and
PerformSafely.

Adding const solves the issue but GCC should be able to determine that the
function pointer can never be modified and inline the function invocations as
LLVM is doing.