Otherwise, if you don’t want to use these instructions (i.e writing for ATi cards), I think that the log2 instructions will be part of your equation. I do not believe on nv40 (and thus the RSX) these instructions are macros, thus are a viable choice for Killzone2. While searching for the Cg/GLSL function-names of the unpack/pack instructions, I stumbled on some blog, where someone stated that on his GF80 the pack/unpack instructions take 4-10 cycles (“probably internal bit-shifting”).
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