--- Comment #4 from Tom de Vries <vries at gcc dot> ---
(In reply to from comment #3)

> This is the usual "you should not repeat analysis during transform" issue.
> The vectorizer gets around this by caching relevant scalar evolution
> but obviously that's difficult if using generic stuff like
> canonicalize_loop_ivs ...

I wonder if it makes sense to add an interface to scalar_evolution_info to
update the instantiated_below field for existing entries. So, before the loop
versioning, the loop preheader is bb10, but after loop versioning, it's bb15.
If we update the instantiated_below field from 10 to 15, the cached scalar
evolution info can still be used.

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