[Issue 9655] New: Two functions with identical implementations are allowed to have the same address

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9655

           Summary: Two functions with identical implementations are
                    allowed to have the same address
           Product: D
           Version: D2
          Platform: All
               URL: http://www.informit.com/guides/content.aspx?g=cplusplu
                    s&seqNum=561
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: websites
        AssignedTo: nobody at puremagic.com
        ReportedBy: bugzilla at digitalmars.com


--- Comment #0 from Walter Bright <bugzilla at digitalmars.com> 2013-03-05 21:54:35 PST ---
In regards to:

http://d.puremagic.com/issues/show_bug.cgi?id=9623

Related C++ article "Can Two Functions Have the Same Address?"
http://www.informit.com/guides/content.aspx?g=cplusplus&seqNum=561

This quote pretty much sells me:

--
Additionally, Google's compiler team have experimented with Identical Code
Folding (ICF) and reported that "[d]etailed experiments on the x86 platform
show that ICF can reduce the text size [the program section in which functions'
code is stored, DK] of some Google binaries, whose average text size is 50 MB,
by up to 7%."
--

We should settle the issue by updating the D spec to explicitly allow functions
to have the same address.

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