g++-2.91.34 19980530 : code generation bug on sparc-sun-solaris2.5.1 with -O2

[Laurent Bonnaud <bonnaud at irisa dot fr>]

Hi,

the following code compiles, but when it is run, it crashes with a "Bus
Error".  The program itself has no bugs : it uses no pointers ans has
been checked with purify.  The same program runs without crashing, if
it is compiled with -O0, -O1 or -O3 (because the constructor call is
then inlined).  It runs well when compiled on i686-pc-linux-gnu with
-O2.  I have reduced the code as much as possible, and when i remove
something the program does not crash anymore.

% g++ -O2 bug.cc
% ./a.out 
Bus error

-- 
Laurent.

==================================

class Point
{
public:
  Point(double in_U, double in_V)
    : U(in_U),V(in_V) {}

  double U;
  double V;
} ;

class Mvt_aff
{
public:
  Mvt_aff(Point Point,
	  double in_TU, double in_TV,
	  double in_A11, double in_A12,
	  double in_A21, double in_A22);
  Point Center;
  double TU,TV,A11,A12,A21,A22;
} ;

Mvt_aff::Mvt_aff(Point Point, double in_TU, double in_TV,
		 double in_A11, double in_A12,
		 double in_A21, double in_A22)
  : Center(Point),
    TU(in_TU), TV(in_TV), A11(in_A11), A12(in_A12), A21(in_A21), A22(in_A22)
{}

Mvt_aff
COMP(const Mvt_aff& ro_First, const Mvt_aff& ro_Second)
{
  Mvt_aff o_Second(Point(0,0), 0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
  double A21 = 0.0;
  double A22 = o_Second.A21*ro_First.A12;

  return Mvt_aff(Point(0,0), 0.0, 0.0, 0.0, 0.0, A21,A22);
}

int main()
{
  Mvt_aff M1(Point(0,0), 0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
  Mvt_aff M2(Point(0,0), 0.0, 0.0, 0.0, 0.0, 0.0, 0.0);
  COMP(M1,M2);
}