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From: "matthijs at stdin dot nl" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/45791] Missed devirtualization
Date: Mon, 24 Feb 2014 09:44:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45791

Matthijs Kooijman <matthijs at stdin dot nl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |matthijs at stdin dot nl

--- Comment #15 from Matthijs Kooijman <matthijs at stdin dot nl> ---
I ran into another variant of this problem, which I reduced to the following
testcase. I found the problem on 4.8.2, but it is already fixed in trunk /
gcc-4.9 (Debian 4.9-20140218-1). Still, it might be useful to have the testcase
here for reference.

class Base { };

class Sub : public Base {
public: 
        virtual void bar();
};

Sub foo;
Sub * const pointer = &foo;
Sub* function() { return &foo; };

int main() {
        // Gcc 4.8.2 devirtualizes this:
        pointer->bar();
        // but not this:
        function()->bar();
}