diff options
| author | Kenneth Graunke <[email protected]> | 2015-01-21 23:25:56 -0800 |
|---|---|---|
| committer | Kenneth Graunke <[email protected]> | 2015-01-23 14:53:26 -0800 |
| commit | 551a752a592703a97dcee74765463bb15ccb8b14 (patch) | |
| tree | 8eddaa7314658513ac052e2963f2b99d83074796 | |
| parent | 3e56572c498bea3c41692c80c242883373dab42a (diff) | |
nir: Add algebraic optimizations for pointless shifts.
The GLSL IR optimization pass contained these; we may as well include
them too.
v2: Fix a >> 0 and a << 0 optimizations (caught by Matt).
No change in the number of NIR instructions on a shader-db run.
total i965 instructions in shared programs: 6035397 -> 6035392 (-0.00%)
i965 instructions in affected programs: 542 -> 537 (-0.92%)
helped: 2 (in glamor)
Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Jason Ekstrand <[email protected]>
Reviewed-by: Matt Turner <[email protected]>
| -rw-r--r-- | src/glsl/nir/nir_opt_algebraic.py | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/glsl/nir/nir_opt_algebraic.py b/src/glsl/nir/nir_opt_algebraic.py index 53fe4a0804e..be9487031d2 100644 --- a/src/glsl/nir/nir_opt_algebraic.py +++ b/src/glsl/nir/nir_opt_algebraic.py @@ -80,6 +80,13 @@ optimizations = [ # DeMorgan's Laws (('iand', ('inot', a), ('inot', b)), ('inot', ('ior', a, b))), (('ior', ('inot', a), ('inot', b)), ('inot', ('iand', a, b))), + # Shift optimizations + (('ishl', 0, a), 0), + (('ishl', a, 0), a), + (('ishr', 0, a), 0), + (('ishr', a, 0), a), + (('ushr', 0, a), 0), + (('ushr', a, 0), 0), # This one may not be exact (('feq', ('fadd', a, b), 0.0), ('feq', a, ('fneg', b))), |