[lno] internal compiler error: in record_dependences_for_modify_expr, at tree-scalar-evolution.c:3236

[Richard Guenther]

Richard Guenther wrote:
> Hi!
> 
> With todays CVS I get the following ICE with the tramp3d-v2 testcase at
> http://www.tat.physik.uni-tuebingen.de/~rguenth/gcc/tramp3d-v2.cpp.gz
> 
> ~/ix86/gccssa-lno/bin/g++ -o tramp3d-v2 tramp3d-v2.cpp -O2 -msse2 
> -ftree-vectorize
> tramp3d-v2.cpp: In member function `void RelationList::setDirty() const':
> tramp3d-v2.cpp:47400: internal compiler error: in 
> record_dependences_for_modify_expr, at tree-scalar-evolution.c:3236
> Please submit a full bug report,
> with preprocessed source if appropriate.
> See <URL:http://gcc.gnu.org/bugs.html> for instructions.
> 
> trying to debug this with gdb, my gdb version (5.3) segfaults at setting 
> the breakpoint to the above location.  So you have to dig for your own - 
> but maybe TREE_CODE_LENGTH (TREE_CODE (rhs)) is ... 3? (dunno, function 
> call, I assume).

Grepping through tree.def there are tree codes with lengths 3 and 4 
which encountered, whould ICE here.  Amongst them vtable-ref which seems 
to be a likely candidate (the elem(i)->setDirty() call is polymorphic).

Richard.

> 
> The code failing looks actually like
> 
> struct RelationList {
>   void setDirty() const
>     {
>       for (int i = 0; i < list_m->size(); ++i)
>         list_m->elem(i)->setDirty();
>     }
> private:
>   RefCountedPtr<RelationListData> list_m;
> };
> 
> where ->elem() returns an element of std::vector<RelationListItem *>.
> 
> Richard.
>