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Re: [PATCH] Fix four bugs in combine


> > This patches fixes four related bugs in combine.  Some of these might
> > have been introduced by the cfglayout conversion, I am not sure though.
>
> No, fortunately they are far more recent (r145283).

Hmm, I presume r145283 is this cfglayout conversion, right?

I'm a little puzzled by this conversion: how is it supposed to work?  AFAICS 
most of the current code still expects the cfgrtl and I don't understand this 
condition:

      if (!single_pred_p (this_basic_block)
	  || single_pred (this_basic_block)->index != this_basic_block->index - 1)
	label_tick_ebb_start = label_tick;

Is this condition to start an EBB guaranteed to be valid by the cfglayout?

-- 
Eric Botcazou


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