Re: [PATCH 0/4] MR168: hlsl: ps_1_* outputs.

[Matteo Bruni (＠Mystral)]

Matteo Bruni (@Mystral) commented about libs/vkd3d-shader/hlsl_codegen.c:
> - size_t i;
> - for (i = 0; i < 4; ++i)
> - for (i = 0; i < allocator->count; ++i)
> {
> -
>    if (allocator->regs[component_idx + i].last_read <= first_write)
> -
>    {
> -
>        writemask |= 1u << i;
> -
>        if (++count == reg_size)
> -
>            return writemask;
> -
>    }
> -
>    const struct allocation *allocation = &allocator->allocations[i];
> -
> -
>    /* We do not overlap if first write == last read:
> -
>     * this is the case where we are allocating the result of that
> -
>     * expression, e.g. "add r0, r0, r1". */

I'm confused by this comment: doesn't that example show that you can in fact use the same register as both source and destination?