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Re: Problem with tree-ssa-loop-ivopts.c:get_computation-cost


This is http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22212
and is the problem blocking Ada bootstrap on x86_64-linux,
it would be great to move forward on this.

Laurent

On Thu, 2005-06-30 at 18:18 -0400, Richard Kenner wrote:
> This function generates RTL from an expression to see how many RTL insns
> it is.  But this causes a problem compiling the Ada ACATS test cxa4006.
> 
> The problem is when part of the expression has a location.  In that
> case, record_block_change is called and that relies on
> cfun->ib_boundaries_block being set.  But it isn't because we aren't
> expanding stuff "for real".  A kludge would be to test that field, but
> what's the proper way?
> 
> Also, seq_cost really should be looking at next_real_insn, not NEXT_INSN,
> since any notes shouldn't be counted.
> 


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