diff options
| author | Eric Anholt <[email protected]> | 2015-03-29 23:04:21 -0700 |
|---|---|---|
| committer | Eric Anholt <[email protected]> | 2015-04-01 10:57:01 -0700 |
| commit | 15b03b7964fc2c3c52e9f384815b76957f557878 (patch) | |
| tree | 1d00b9d4b20bc34ebe6d155c14e823f6a00eea23 /src/glsl/nir | |
| parent | 6e8d4a2f8043a3a7a28175326e63770aa9511ee7 (diff) | |
nir: Recognize a pattern of bool frobbing from TGSI KILL_IF.
TGSI's conditional discards take float arg and negate it, so GLSL to TGSI
generates a b2f and negates that value. Only, in NIR we want a proper
bool once again, so we compare with 0. This is a lot of pointless extra
instructions.
total instructions in shared programs: 39735 -> 39702 (-0.08%)
instructions in affected programs: 1342 -> 1309 (-2.46%)
Reviewed-by: Connor Abbott <[email protected]>
Diffstat (limited to 'src/glsl/nir')
| -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 301d7a8ebcf..190bd916efe 100644 --- a/src/glsl/nir/nir_opt_algebraic.py +++ b/src/glsl/nir/nir_opt_algebraic.py @@ -100,6 +100,8 @@ optimizations = [ (('fmul', ('b2f', a), ('b2f', b)), ('b2f', ('iand', a, b))), (('fsat', ('fadd', ('b2f', a), ('b2f', b))), ('b2f', ('ior', a, b))), (('iand', 'a@bool', 1.0), ('b2f', a)), + (('flt', ('fneg', ('b2f', a)), 0), a), # Generated by TGSI KILL_IF. + (('flt', ('fsub', 0.0, ('b2f', a)), 0), a), # Generated by TGSI KILL_IF. # Comparison with the same args. Note that these are not done for # the float versions because NaN always returns false on float # inequalities. |