diff options
| author | Ian Romanick <[email protected]> | 2016-03-02 15:18:34 -0800 |
|---|---|---|
| committer | Ian Romanick <[email protected]> | 2016-03-22 14:44:57 -0700 |
| commit | 564a8b8a2645939cd416b62ae2e59c2fbd4b9fc2 (patch) | |
| tree | c914706e38104d68fb8837eac6d6bf70f544a989 /src | |
| parent | bf0d60aa115cb8ba83f9b853f1b57c290eaf325b (diff) | |
nir: Simplify 0 >= b2f(a)
This also prevented some regressions with other patches in my local
tree.
Broadwell / Skylake
total instructions in shared programs: 8980835 -> 8980833 (-0.00%)
instructions in affected programs: 45 -> 43 (-4.44%)
helped: 1
HURT: 0
total cycles in shared programs: 70077904 -> 70077900 (-0.00%)
cycles in affected programs: 122 -> 118 (-3.28%)
helped: 1
HURT: 0
No changes on earlier platforms.
v2: Modify the comments to look more like a proof.
Signed-off-by: Ian Romanick <[email protected]>
Reviewed-by: Matt Turner <[email protected]>
Diffstat (limited to 'src')
| -rw-r--r-- | src/compiler/nir/nir_opt_algebraic.py | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py index 5b3694e1933..facc33b4e0a 100644 --- a/src/compiler/nir/nir_opt_algebraic.py +++ b/src/compiler/nir/nir_opt_algebraic.py @@ -101,6 +101,13 @@ optimizations = [ (('inot', ('ige', a, b)), ('ilt', a, b)), (('inot', ('ieq', a, b)), ('ine', a, b)), (('inot', ('ine', a, b)), ('ieq', a, b)), + + # 0.0 >= b2f(a) + # b2f(a) <= 0.0 + # b2f(a) == 0.0 because b2f(a) can only be 0 or 1 + # inot(a) + (('fge', 0.0, ('b2f', a)), ('inot', a)), + (('fge', ('fneg', ('fabs', a)), 0.0), ('feq', a, 0.0)), (('bcsel', ('flt', a, b), a, b), ('fmin', a, b)), (('bcsel', ('flt', a, b), b, a), ('fmax', a, b)), |