[Bug rtl-optimization/65078] [5.0 Regression] 4.9 and 5.0 generate more spill-fill in comparison with 4.8.2

["rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65078

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Uroš Bizjak from comment #3)
> Similar to PR21182 ?
> 
> As suggested in the above PR, does "-fschedule-insns -fsched-pressure" make
> any difference?

No.
>From gcc-bugs-return-477435-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Feb 16 14:47:12 2015
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From: "trippels at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/64812] [4.9 regression] x86 LibreOffice Build failure: undefined reference to acquire
Date: Mon, 16 Feb 2015 14:47:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?idd812

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Target|i?86-*-*                    |
             Status|WAITING                     |NEW
                 CC|                            |hubicka at gcc dot gnu.org
          Component|regression                  |ipa
      Known to fail|                            |5.0

--- Comment #7 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
markus@x4 tmp % cat fmgridif.ii
template <class T> class A
{
  T *p;

public:
  A (T *p1) : p (p1) { p->acquire (); }
};

class B
{
public:
  virtual void acquire ();
};
class D : public B
{
};
class F : B
{
  int mrContext;
};
class WindowListenerMultiplexer : F, public D
{
  void
  acquire ()
  {
    acquire ();
  }
};
class C
{
  void createPeer () throw ();
  WindowListenerMultiplexer maWindowListeners;
};
class FmXGridPeer
{
public:
  void addWindowListener (A<D>);
} a;
void
C::createPeer () throw ()
{
  a.addWindowListener (&maWindowListeners);
}

markus@x4 tmp % g++ -Os -c fmgridif.ii && nm --demangle fmgridif.o | grep
WindowListenerMultiplexer
                 U non-virtual thunk to WindowListenerMultiplexer::acquire()

markus@x4 tmp % g++ -O2 -c fmgridif.ii && nm --demangle fmgridif.o | grep
WindowListenerMultiplexer
0000000000000000 W WindowListenerMultiplexer::acquire()
0000000000000010 W non-virtual thunk to WindowListenerMultiplexer::acquire()

Not sure if the devirtualization is valid. Honza?