diff options
| author | Thomas Helland <[email protected]> | 2015-08-06 13:36:05 +0200 |
|---|---|---|
| committer | Matt Turner <[email protected]> | 2015-08-18 11:34:44 -0700 |
| commit | 49d0a36bd6593ce09486678a7bf3d500af5e265c (patch) | |
| tree | c3f67f0536192a8487c210fd52b6261cf68ba67f /src/glsl/nir | |
| parent | a39167d5949c76dfb48994caead4b59ab5f80318 (diff) | |
nir: Simplify feq(fneg(a), a)) -> feq(a, 0.0)
The positive and negative value of a float can only
be equal to each other if it is -0.0f and 0.0f.
This is safe for Nan and Inf, as -Nan != Nan, and -Inf != Inf
This gives no changes in my shader-db
Signed-off-by: Thomas Helland <[email protected]>
Reviewed-by: Matt Turner <[email protected]>
Diffstat (limited to 'src/glsl/nir')
| -rw-r--r-- | src/glsl/nir/nir_opt_algebraic.py | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/glsl/nir/nir_opt_algebraic.py b/src/glsl/nir/nir_opt_algebraic.py index b76fef236a9..226e0a8d85c 100644 --- a/src/glsl/nir/nir_opt_algebraic.py +++ b/src/glsl/nir/nir_opt_algebraic.py @@ -114,6 +114,7 @@ optimizations = [ (('seq', a, b), ('b2f', ('feq', a, b)), 'options->lower_scmp'), (('sne', a, b), ('b2f', ('fne', a, b)), 'options->lower_scmp'), (('fne', ('fneg', a), a), ('fne', a, 0.0)), + (('feq', ('fneg', a), a), ('feq', a, 0.0)), # Emulating booleans (('imul', ('b2i', a), ('b2i', b)), ('b2i', ('iand', a, b))), (('fmul', ('b2f', a), ('b2f', b)), ('b2f', ('iand', a, b))), |