--- Comment #4 from Marc Glisse <glisse at gcc dot> ---
Note that this is good for identity, but we could also turn a map 0->3, 1->4,
5->8 into x->x+3, or generally any map (with an unreachable default case) into
a polynomial (or some other simple function), the cost of which might be higher
or lower than the jump table. It probably isn't worth going too far in that
direction though.

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