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902ddee557
SM1 dp2add doesn't map src swizzles to the dst writemask, also it expects the last argument to have a replicate swizzle. Before this patch we were writing the operation as: ``` dp2add r0.x, r1.x, r0.x, r2.x ``` and now it is: ``` dp2add r0.x, r1.xyxx, r0.xyxx, r2.x ``` dp2add now has its own function, write_sm1_dp2add(), since it seems to be the only instruction with this structure. Ideally we would be using the default swizzles for the first two src arguments: ``` dp2add r0.x, r1, r0, r2.x ``` since, according to native's documentation, these are supported for all sm < 4. But this change -- along with following the convention of repeating the last component of the swizzle when fewer than 4 components are to be specified -- would require more global changes, probably in hlsl_swizzle_from_writemask() and hlsl_map_swizzle().