Re: [PATCH 0/1] MR74: vkd3d-shader/hlsl: Support dot() for SM1.

[Zebediah Figura (＠zfigura)]

If we're going to do it this way, it should be a separate DP2ADD operation.

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https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/74#note_22165