https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81744

--- Comment #6 from amker at gcc dot gnu.org ---
(In reply to Jakub Jelinek from comment #5)
> (In reply to amker from comment #4)
> > So with below code in prepare_finalizers_chain:
> >   tree fini, niters = number_of_latch_executions (loop);
> >   //...
> >   niters = copy_node (niters);
> >   niters = force_gimple_operand (niters, &stmts, true, NULL);
> > 
> > Even with copy_node, the old niters (which is loop->nb_iterations is changed
> > by the call to force_gimple_operand.  The code expects every time function
> > prepare_finalizers_chain is callsed, the niters/loop->nb_iterations stays in
> > the same.  What should I do that?  Thanks.
> 
> copy_node copies only one level.  force_gimple_operand, like other
> entrypoints to the gimplifier, are destructive on the tree you pass in, so
> if you want to reuse niters after it, you should use niters = unshare_expr
> (niters).

Yes, I will send a patch.  Thanks.

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