https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81442

--- Comment #7 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #5)
> ... the patches handle the issue in different ways:
> - handle the case that there's an edge with uninitialized probability
> - initialize probability on some edges
> 
> At first glance I'd say that one doesn't necessarily exclude the other.

Having reflected a bit further, while the point solution from comment 1 is
something that always works, it also hides the fact that we have inconsistent
edge info. It's probably better to check more aggressively for the
inconsistency: I've submitted a tentative patch at
https://gcc.gnu.org/ml/gcc-patches/2017-08/msg00194.html

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