Dear all,
since on r600 the tesselation shaders don't go through the sb-optimizer I
though it might help to improve performance by applying some optimizations
to the created assembly. The patches are experimental but to a point where
I think some input from you could be helpful.
This patch series does the following optimizations:
- pre-calculate and re-use address offsets that were always calculated
on the fly
- only load from LDS what is really requested (based on the source swizzle
masks
of the input values).
- preload all used elements in cases where the shader would only partially load
data in different places.
At this point there are no piglit regressions, but an unrelated GOU lockup is
triggered. (Dave and me are already testing patches for this).
Benchmarking on BARTS with Unigine-Heaven and Tessmark x32 (with
MESA_GL_VERSION_OVERRIDE=4.0) I get the following improvements:
pre-opt post-opt
master: fb0e9b5197
===============================================
Heaven
Res: 1280x1024
Q: High
Tess: Normal
-----------------------------------------------
Time: 260.2 260.2
Frames: 3276 4192
FPS: 12.6 16.1
Min FPS: 4.0 4.6
Max FPS: 60.9 69.0
Score: 317.2 405.8
-----------------------------------------------
Tessmark x32
R: 1024x640
-----------------------------------------------
Points: 635 700
FPS: 10 11
A github repo inclusing these patches can be found at
https://github.com/gerddie/mesa/tree/r600-tess-speedup
many thanks for any comments,
Gert
Gert Wollny (6):
r600:shader: Fix all warnings issed with "-Wall -Wextra"
r600_shader: only load from LDS what is really used
r600_shader.c: Add a caching structure for load tesselation data
r600_shader: Move calculation of offset to do_lds_fetch_values
r600_shader.c: Pre-caclculate some offsets for LDS access
r600_shader.c: Preload some LDS values.
src/gallium/drivers/r600/r600_shader.c | 636 ++++++++++++++++++++++++---------
1 file changed, 476 insertions(+), 160 deletions(-)
--
2.13.6
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