10:52 <itoral> apinheiro: about the register allocation weirdness I told you about yesterday... it turns out the VIR in one version of the shader is indeed different, but very slightly so, however, that had a significant impact in the generated code because it affected register allocation in a way that limited QPU instruction merging

10:53 <itoral> so I traced back the source of the issue in the register allocator, and ran that through the UE4 shaders in shader-db

10:53 <itoral> and I got a -2% in instruction counts

10:53 <itoral> I still have to do a full run and see if the benefit stays there, but that is promising