[Bug tree-optimization/17510] [4.0 Regression] -fstrict-aliasing triggers miscompilation

[rguenth at tat dot physik dot uni-tuebingen dot de]

------- Additional Comments From rguenth at tat dot physik dot uni-tuebingen dot de  2004-09-15 22:22 -------
Created an attachment (id=7146)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=7146&action=view)
ed script for testcase reduction

Here's cut in compile-time (10min to 1:30) - ed script to delete unnecessary
stuff.	Failure now

(gdb) run -n 2
Starting program: /net/alwazn/home/rguenth/PR17510/tramp3d-v3 -n 2
i = 1	 t = 0.001	 dt = 0.001 (9.9999e-07s/it)

Program received signal SIGSEGV, Segmentation fault.
0x08067f4c in
MultiArgKernel<MultiArg3<Field<UniformRectilinearMesh<MeshTraits<3, double,
UniformRectilinearTag, CartesianTag, 3> >, double, BrickView>,
Field<UniformRectilinearMesh<MeshTraits<3, double, UniformRectilinearTag,
CartesianTag, 3> >, double, BrickView>,
Field<UniformRectilinearMesh<MeshTraits<3, double, UniformRectilinearTag,
CartesianTag, 3> >, double, BrickView> >,
EvaluateLocLoop<Adv5::X::MomentumfluxX<3>, 3> >::run (this=0x3)
    at tramp3d-v3.x.cpp:54523
54523	 s = (vx(I) + vx(I+dX)) * 0.5*dt;


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17510