https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63851

--- Comment #4 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> ---
(In reply to Martin Liška from comment #2)
> There's a pair of functions 'g' and 'h' that are proved by IPA ICF to be
> equal and thunk is created (darwin does not have alias support).

If you look at the tree dump, h's argument has restrict but not g:

h (struct array7_integer(kind=4) & restrict x)
{
  check ((struct array7_integer(kind=4) *) x);
}


g (struct array7_integer(kind=4) & x)
{
  check ((struct array7_integer(kind=4) *) x);
}


Shouldn't that disable semantic equality/equivalence?
>From gcc-bugs-return-468806-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Nov 27 23:31:10 2014
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From: "cbaylis at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/64012] GCC-4.9.2 option -fcaller-saves in -O2
Date: Thu, 27 Nov 2014 23:31:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idd012

cbaylis at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
                 CC|                            |cbaylis at gcc dot gnu.org
         Resolution|---                         |INVALID

--- Comment #7 from cbaylis at gcc dot gnu.org ---

This is caused by an invalid implementation of memset in (old versions of) the
Linux kernel.

I investigated this, a longer description is on the Linaro bugzilla at
https://bugs.linaro.org/show_bug.cgi?id’8#c7