fdo-mirrors/mesa
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/mesa/mesa.git synced 2025-12-25 17:20:10 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions

nir/algebraic: Add a couple optimizations for iabs and ishr

Browse source 
Shader-db results on Kaby Lake:

    total instructions in shared programs: 15225213 -> 15222365 (-0.02%)
    instructions in affected programs: 43524 -> 40676 (-6.54%)
    helped: 203
    HURT: 0

Lots of shaders in Shadow Warrior had this pattern along with Deus Ex,
Civ, Shadow of Mordor, and several others.

Reviewed-by: Kristian H. Kristensen <hoegsberg@chromium.org>
This commit is contained in:
Jason Ekstrand 2019-03-10 10:06:56 -05:00 • committed by Jason Ekstrand
parent 0803bef006
commit 2b76de9b5d
1 changed files with 6 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
src/compiler/nir/nir_opt_algebraic.py
View file

@ -439,6 +439,12 @@ optimizations = [
(('uge', '#a', ('umax', '#b', c)), ('iand', ('uge', a, b), ('uge', a, c))),
(('uge', ('umin', '#a', b), '#c'), ('iand', ('uge', a, c), ('uge', b, c))),
# Thanks to sign extension, the ishr(a, b) is negative if and only if a is
# negative.
(('bcsel', ('ilt', a, 0), ('ineg', ('ishr', a, b)), ('ishr', a, b)),
('iabs', ('ishr', a, b))),
(('iabs', ('ishr', ('iabs', a), b)), ('ishr', ('iabs', a), b)),
(('fabs', ('slt', a, b)), ('slt', a, b)),
(('fabs', ('sge', a, b)), ('sge', a, b)),
(('fabs', ('seq', a, b)), ('seq', a, b)),