Mainly the implementation of SM1 comparison operators, defined in terms of CMP and SLT instructions, and the capacity to transform SLT->CMP for pixel shaders and CMP->SLT for vertex shaders.
-- v2: vkd3d-shader/hlsl: Lower CMP instructions for vertex shaders. vkd3d-shader/hlsl: Use hlsl_fixme() on missing SM1 matrix writemask lowering. vkd3d-shader/hlsl: Lower SLT instructions for pixel shaders. tests: Test equality between tiny and between large numbers on ps_2_0. vkd3d-shader/hlsl: Implement SM1 comparison operators.