https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113247

--- Comment #5 from JuzheZhong <juzhe.zhong at rivai dot ai> ---
(In reply to Robin Dapp from comment #4)
> The other option is to assert that all tune models have at least a vector
> cost model rather than NULL...  But not falling back to the builtin costs
> still makes sense.

I have talked with kito. He just want rocket sifive-series-7 those tune chip
has 
no vector hardware so I think it makes more sense we adapt
builtin_vectorize_cost
to set cost to generic vector cost when there is no vector cost in tune info.

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