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authorMatt Turner <[email protected]>2015-05-18 14:59:13 -0700
committerMatt Turner <[email protected]>2015-05-22 11:26:36 -0700
commit5614bcc416cf2ff1d816d52198e644565ca23bcd (patch)
tree41e8a8e7e8b0981d3f44eca5f316e9bf082b7d2e /src/mesa/swrast
parenta21d23e191696ca130fd63617b8d177055b73dda (diff)
nir: Remove sRGB colorspace conversion round-trip.
Some shaders in Civilization V and Beyond Earth do pow(pow(x, 2.2), 0.454545) which is converting to and from sRGB colorspace. A more general rule that replaces pow(pow(a, b), c) with pow(a, b * c) actually regresses two shaders in Sun Temple in which the result of the inner pow is used twice, once by another pow and once by another instruction. Also, since 2.2 * 0.454545 isn't exactly one, the more general pattern would have still left us with a pow, and I'm 2.2 * 0.454545 percent sure that's not what they want. instructions in affected programs: 934 -> 886 (-5.14%) helped: 16
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