softpipe: Switch to using NIR as the shader format from mesa/st.

This causes our TGSI to use far more temps, since NTT is currently not
releasing temps from registers.  On the other hand, this interpreter is
already spectacularly slow, and if we wanted to go fast we should probably
write a scalar NIR intrepeter.

For now, using NTT means that we test that codepath in preparation for
switching TGSI-consuming HW drivers over, so that we can eventually
garbage collect st_glsl_to_tgsi.

As this is a major restructuring, there are some impacts on piglit:

- Several tests start assert failing about 64-bit NIR registers for temp
  arrays not getting split to vec2s:
  - fs-frexp-dvec4-variable-index.shader_test
  - arb_gpu_shader_fp64/uniform_buffers/{vs,fs,gs}-array-copy.shader_test
  - arb_gpu_shader_int64/execution/indirect-array-two-accesses.shader_test
- dEQP-GLES31.functional.primitive_bounding_box.wide_points.global_state.vertex_geometry_fragment.fbo_bbox_larger
  starts crashing depending on various bits of state (previous tests run
  before it, presence of valgrind, presence of glib's memcheck).  Doesn't
  seem really NTT-specific, added to flakes list with other GS flakes.
- Almost 200 fp64/int64-related tests start passing, mostly around i/o loayout.

shader-db:
total instructions in shared programs: 3492656 -> 3081674 (-11.77%)
total loops in shared programs: 1418 -> 1387 (-2.19%)
total temps in shared programs: 340041 -> 615527 (81.02%)
total const in shared programs: 3158970 -> 1528630 (-51.61%)
total imm in shared programs: 117586 -> 101349 (-13.81%)
Total CPU time (seconds): 430.36 -> 900.94 (109.35%)

FPS results:
glmark2 texture               +7.32484% +/- 3.76528% (n=10)
glmark2 desktop:effect=shadow +20%      +/- 0% (n=10)
glmark2 shadow                +6.49351% +/- 3.65335% (n=7)
glmark2 conditionals          +18.75%   +/- 2.74658% (n=9)

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3395>

This commit is contained in:

Eric Anholt

2019-12-31 16:20:52 -08:00

parent 6444f5702d

commit d0f8fe5909

8 changed files with 91 additions and 20 deletions

									
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docs/envvars.rst
									
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				@@ -451,6 +451,9 @@ Softpipe driver environment variables

				   ``use_llvm``

				      the softpipe driver will try to use LLVM JIT for vertex

				      shading processing.

				   ``use_tgsi``

				      if set, the softpipe driver will ask to directly consume TGSI, instead

				      of NIR.

				LLVMpipe driver environment variables

				~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

softpipe: Switch to using NIR as the shader format from mesa/st.

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