diff options
| author | Kenneth Graunke <[email protected]> | 2015-01-21 23:36:01 -0800 |
|---|---|---|
| committer | Kenneth Graunke <[email protected]> | 2015-01-23 14:53:26 -0800 |
| commit | 391fb32bbef3bdeb7bab78a4d3c5317a0153381e (patch) | |
| tree | 2d2f3bfdee9a8c6b5703e01a8e83cb0980d07baa /src/glsl/nir | |
| parent | 551a752a592703a97dcee74765463bb15ccb8b14 (diff) | |
nir: Add algebraic optimizations for simplifying comparisons.
The first batch removes bonus fnot/inot operations, possibly allowing
other optimizations to better recognize patterns.
The next batch replaces a fadd and constant 0.0 with an fneg - negation
is usually free on GPUs, while addition is not.
total NIR instructions in shared programs: 2020814 -> 2015593 (-0.26%)
NIR instructions in affected programs: 411143 -> 405922 (-1.27%)
helped: 2233
HURT: 214
A few shaders are hurt by a few instructions due to moving neg such
that it has a constant operand, which is then folded, resulting in two
distinct load_consts for x and -x. We can always clean that up later.
total i965 instructions in shared programs: 6035392 -> 6025505 (-0.16%)
i965 instructions in affected programs: 784980 -> 775093 (-1.26%)
helped: 4508
HURT: 2
Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Jason Ekstrand <[email protected]>
Reviewed-by: Matt Turner <[email protected]>
Diffstat (limited to 'src/glsl/nir')
| -rw-r--r-- | src/glsl/nir/nir_opt_algebraic.py | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/glsl/nir/nir_opt_algebraic.py b/src/glsl/nir/nir_opt_algebraic.py index be9487031d2..40722de1ea5 100644 --- a/src/glsl/nir/nir_opt_algebraic.py +++ b/src/glsl/nir/nir_opt_algebraic.py @@ -66,6 +66,15 @@ optimizations = [ (('flrp', a, a, b), a), (('flrp', 0.0, a, b), ('fmul', a, b)), (('fadd', ('fmul', a, b), c), ('ffma', a, b, c)), + # Comparison simplifications + (('inot', ('flt', a, b)), ('fge', a, b)), + (('inot', ('fge', a, b)), ('flt', a, b)), + (('inot', ('ilt', a, b)), ('ige', a, b)), + (('inot', ('ige', a, b)), ('ilt', a, b)), + (('flt', ('fadd', a, b), 0.0), ('flt', a, ('fneg', b))), + (('fge', ('fadd', a, b), 0.0), ('fge', a, ('fneg', b))), + (('feq', ('fadd', a, b), 0.0), ('feq', a, ('fneg', b))), + (('fne', ('fadd', a, b), 0.0), ('fne', a, ('fneg', b))), (('fge', ('fneg', ('fabs', a)), 0.0), ('feq', a, 0.0)), (('fmin', ('fmax', a, 1.0), 0.0), ('fsat', a)), # Logical and bit operations |