[PATCH 1/3] ARM cost model: Penalize insertelement into D subregisters

[Arnold Schwaighofer]

This patch is the first one in a series of three patches that amend the cost model for arm.


Swift has a renaming dependency if we load into D subregisters. We don't have a
way of distinguishing between insertelement operations of values from loads and
other values. Therefore, we are pessimistic for now (The performance problem
showed up in example 14 of gcc-loops).


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