diff options
| author | Ian Romanick <[email protected]> | 2016-03-02 15:36:14 -0800 |
|---|---|---|
| committer | Ian Romanick <[email protected]> | 2016-03-22 14:47:56 -0700 |
| commit | 348e5a71d8bc1398c73b731d3e6d80fd3b122513 (patch) | |
| tree | 93abc2167afaebad40a032acdc126afc1db66426 | |
| parent | 564a8b8a2645939cd416b62ae2e59c2fbd4b9fc2 (diff) | |
nir: Simplify 0 < fabs(a)
Sandy Bridge / Ivy Bridge / Haswell
total instructions in shared programs: 8462180 -> 8462174 (-0.00%)
instructions in affected programs: 564 -> 558 (-1.06%)
helped: 6
HURT: 0
total cycles in shared programs: 117542462 -> 117542276 (-0.00%)
cycles in affected programs: 9768 -> 9582 (-1.90%)
helped: 12
HURT: 0
Broadwell / Skylake
total instructions in shared programs: 8980833 -> 8980826 (-0.00%)
instructions in affected programs: 626 -> 619 (-1.12%)
helped: 7
HURT: 0
total cycles in shared programs: 70077900 -> 70077714 (-0.00%)
cycles in affected programs: 9378 -> 9192 (-1.98%)
helped: 12
HURT: 0
G45 and Ironlake showed no change.
v2: Modify the comments to look more like a proof.
Signed-off-by: Ian Romanick <[email protected]>
Reviewed-by: Matt Turner <[email protected]>
| -rw-r--r-- | src/compiler/nir/nir_opt_algebraic.py | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py index facc33b4e0a..c013fd78d9e 100644 --- a/src/compiler/nir/nir_opt_algebraic.py +++ b/src/compiler/nir/nir_opt_algebraic.py @@ -108,6 +108,12 @@ optimizations = [ # inot(a) (('fge', 0.0, ('b2f', a)), ('inot', a)), + # 0.0 < fabs(a) + # fabs(a) > 0.0 + # fabs(a) != 0.0 because fabs(a) must be >= 0 + # a != 0.0 + (('flt', 0.0, ('fabs', a)), ('fne', a, 0.0)), + (('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)), |