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From: "jason at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/51565] [4.4/4.5/4.6/4.7 Regression] fastcall in array of method pointers: internal compiler error
Date: Wed, 11 Jan 2012 20:51:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51565

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |jason at gcc dot gnu.org
         AssignedTo|unassigned at gcc dot       |jason at gcc dot gnu.org
                   |gnu.org                     |

--- Comment #2 from Jason Merrill <jason at gcc dot gnu.org> 2012-01-11 20:51:01 UTC ---
4.3 generated wrong code for this testcase, which you can see by extending it a
bit:

extern "C" void abort();

int i;

struct Foo {
    __attribute__((fastcall))
    void fee(int j) { i = j; }
};

int main()
{
    typedef void (Foo::*FP)(int);
    FP fp[] = {&Foo::fee};
    (Foo().*(fp[0]))(42);
    if (i != 42)
      abort();
}

This is true back to version 3.4.  Before that, we just ignored the attribute.