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414dbb2d5c
My thought in having both arguments conditionally moved was that it should theoretically save some power by not doing work in those channels. However, it ends up costing us instructions because we can't register-coalesce the first of the MOVs, and it also introduces extra scheduling dependencies. The instruction cost would swamp whatever power benefit I was hoping for. shader-db results: total instructions in shared programs: 100548 -> 99741 (-0.80%) instructions in affected programs: 42450 -> 41643 (-1.90%) With obvious outliers removed (I had an X11 emacs running over the network in the "after" case), 3DMMES Taiji showed 1.07231% +/- 0.488241% fps improvement (n=18, 30). |
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