Re: [tree-ssa] Lowering of VLA's, part 2

[Zdenek Dvorak <rakdver at atrey dot karlin dot mff dot cuni dot cz>]

Hello,

> >> >> > 	* gimplify.c (struct tree_p_list): New type.
> >> >> > 	(join_tree_p_list, add_tree_p_list, free_tree_p_list,
> >> >> > 	build_stack_save_restore, prepend_to_exit_gotos): New functions.
> >> >> 
> >> >> Use a TRY_FINALLY_EXPR instead.
> >> >
> >> > unnecesarily creating new eh handling constructs (that we really do not
> >> > manage somehow greatly) seems a bit like overkill to me.
> >
> >> If we want the stack to be restored properly when we
> >> exit a block with a throw, we need to use an EH construct.
> >
> > do we indeed want this? Of course it won't spoil anything, but
> > we can live without it.
> 
> We absolutely want this.  That we don't do it currently is a bug.

not really.  It does not change correctness, and since exceptions
should not occur frequently, the performance/temporary space leak tradeoff
might be justified.

Zdenek