optimization/4226: 3.1 ICE in remove_unnecessary_notes

[snyder at fnal dot gov]

>Number:         4226
>Category:       optimization
>Synopsis:       3.1 ICE in remove_unnecessary_notes
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          ice-on-legal-code
>Submitter-Id:   net
>Arrival-Date:   Tue Sep 04 10:56:00 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     scott snyder
>Release:        3.1 20010902 (experimental)
>Organization:
>Environment:
System: Linux karma 2.4.3-12 #1 Fri Jun 8 13:35:30 EDT 2001 i686 unknown
Architecture: i686

	
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ../egcs/configure --prefix=/usr/local/egcs --enable-threads=posix --enable-long-long
>Description:
gcc 3.1 crashes when compiling the example with -O2.
>How-To-Repeat:

$ g++ -c -O2 x.cc
x.cc: In constructor `HepHistoHist1D::HepHistoHist1D(HepObj*)':
x.cc:38: Internal compiler error in remove_unnecessary_notes, at emit-rtl.c:
   2987
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://www.gnu.org/software/gcc/bugs.html> for instructions.


------------------------------------------------------------
// g++ -c -O2

template <class _Tp>
class allocator {
public:
  allocator() {}
  ~allocator();

};

class X
{
public:
  typedef allocator<char> Alloc;
  X (const char*, const Alloc& = Alloc());
};


class HepObj 
{
public:
  virtual ~HepObj ();
  X    * dir_;
  X      dir()     const
  {return (dir_ ) ? *dir_ : "";}
};

class HepHistoHist1D
  : public HepObj
{
public:
  HepHistoHist1D(HepObj* original);
};

HepHistoHist1D::HepHistoHist1D (HepObj* original)
{
  original->dir();
}


------------------------------------------------------------


>Fix:
	
>Release-Note:
>Audit-Trail:
>Unformatted: