diff options
| author | Matt Turner <[email protected]> | 2015-05-18 14:59:13 -0700 |
|---|---|---|
| committer | Matt Turner <[email protected]> | 2015-05-22 11:26:36 -0700 |
| commit | 5614bcc416cf2ff1d816d52198e644565ca23bcd (patch) | |
| tree | 41e8a8e7e8b0981d3f44eca5f316e9bf082b7d2e /src/glsl | |
| parent | a21d23e191696ca130fd63617b8d177055b73dda (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
Diffstat (limited to 'src/glsl')
| -rw-r--r-- | src/glsl/nir/nir_opt_algebraic.py | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/glsl/nir/nir_opt_algebraic.py b/src/glsl/nir/nir_opt_algebraic.py index fa039222fd2..eace791f5b0 100644 --- a/src/glsl/nir/nir_opt_algebraic.py +++ b/src/glsl/nir/nir_opt_algebraic.py @@ -156,6 +156,8 @@ optimizations = [ (('fpow', a, 2.0), ('fmul', a, a)), (('fpow', a, 4.0), ('fmul', ('fmul', a, a), ('fmul', a, a))), (('fpow', 2.0, a), ('fexp2', a)), + (('fpow', ('fpow', a, 2.2), 0.454545), a), + (('fpow', ('fabs', ('fpow', a, 2.2)), 0.454545), ('fabs', a)), (('fsqrt', ('fexp2', a)), ('fexp2', ('fmul', 0.5, a))), (('frcp', ('fexp2', a)), ('fexp2', ('fneg', a))), (('frsq', ('fexp2', a)), ('fexp2', ('fmul', -0.5, a))), |