non-local goto optimization

[Nathan Sidwell]

Eric Botcazou wrote:
>> Do you have another suggestion as to how to do this?  I don't see one that
>> is immediately obvious beyond having expand_builtin_unwind set a global.
> 
> Yes, that's a bit annoying.  I can think of a few hacks (setting/clearing 
> TREE_USED on the DECL of BUILT_IN_UNWIND_INIT) but it's a bit extreme.
> 
> So it seems that we really need a new flag in struct function after all.
> But I would rather name it "calls_unwind_init" like a few others and invoke 
> the new has_nonexceptional_receiver predicate directly from reload.

Is this version ok?  Sorry for the long delay.

nathan

-- 
Nathan Sidwell    ::   http://www.codesourcery.com   ::         CodeSourcery
nathan@codesourcery.com    ::     http://www.planetfall.pwp.blueyonder.co.uk

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