Re: [PATCH v3 0/1] MR239: vkd3d-shader/codegen: Skip register allocation for unused object variables.

[Nikolay Sivov (＠nsivov)]

On Wed Jun 21 07:27:42 2023 +0000, Francisco Casas wrote:
> Approving. However, we still may want a better criteria for a variable
> begin used that `var->last_read`, probably something regset-wise.
> This compiles in native (ps_5_0), yet we would be detecting overlaps:
> struct {
>     Texture2D tex;
>     sampler sam;
> } a : register(s0);
> sampler sam_alone : register(s0);
> float4 main() : sv_target
> {
>     return a.tex.Sample(sam_alone, float2(0, 0));
> }

Does that mean you can have only one object of distinct type in a structure, when register() is used?  Or it will implicitly reserve a range [s0,s0+n)?

How do we currently track unused object in struct members?