diff options
| author | Matt Turner <[email protected]> | 2015-03-26 10:07:58 -0700 |
|---|---|---|
| committer | Matt Turner <[email protected]> | 2015-04-01 13:43:57 -0700 |
| commit | 099c729b4cb6863e8ddbdb9afe7fd7bd53c11ee1 (patch) | |
| tree | e359d3103011f36faa971f62890e2709542f3959 /src/glsl | |
| parent | 8a6ae384b2ae95f047e9d48a5a4c11002ffdd814 (diff) | |
nir: Add identities for the log function.
The rcp(log(x)) pattern affects instruction counts.
instructions in affected programs: 144 -> 138 (-4.17%)
helped: 6
Reviewed-by: Eric Anholt <[email protected]>
Diffstat (limited to 'src/glsl')
| -rw-r--r-- | src/glsl/nir/nir_opt_algebraic.py | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/glsl/nir/nir_opt_algebraic.py b/src/glsl/nir/nir_opt_algebraic.py index db2fe037206..185c291aa72 100644 --- a/src/glsl/nir/nir_opt_algebraic.py +++ b/src/glsl/nir/nir_opt_algebraic.py @@ -145,6 +145,14 @@ optimizations = [ (('frcp', ('fexp', a)), ('fexp', ('fneg', a))), (('frsq', ('fexp2', a)), ('fexp2', ('fmul', -0.5, a))), (('frsq', ('fexp', a)), ('fexp', ('fmul', -0.5, a))), + (('flog2', ('fsqrt', a)), ('fmul', 0.5, ('flog2', a))), + (('flog', ('fsqrt', a)), ('fmul', 0.5, ('flog', a))), + (('flog2', ('frcp', a)), ('fneg', ('flog2', a))), + (('flog', ('frcp', a)), ('fneg', ('flog', a))), + (('flog2', ('frsq', a)), ('fmul', -0.5, ('flog2', a))), + (('flog', ('frsq', a)), ('fmul', -0.5, ('flog', a))), + (('flog2', ('fpow', a, b)), ('fmul', b, ('flog2', a))), + (('flog', ('fpow', a, b)), ('fmul', b, ('flog', a))), # Division and reciprocal (('fdiv', 1.0, a), ('frcp', a)), (('frcp', ('frcp', a)), a), |