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st/nir: Don't lower indirects when linking

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I believe this was stuck here early because otherwise
nir_opt_copy_prop_vars could undo what lower_io_to_temporaries does.
However that has since been fixed. Also, we now use scratch for large
variables so the comment is stale.

On radeonsi these are the shader-db results:

Totals:
SGPRS: 3955968 -> 3955968 (0.00 %)
VGPRS: 2220208 -> 2220220 (0.00 %)
Spilled SGPRs: 11387 -> 11387 (0.00 %)
Spilled VGPRs: 97 -> 97 (0.00 %)
Private memory VGPRs: 2528 -> 2528 (0.00 %)
Scratch size: 2656 -> 2656 (0.00 %) dwords per thread
Code Size: 76002108 -> 76002204 (0.00 %) bytes
LDS: 740 -> 740 (0.00 %) blocks
Max Waves: 772779 -> 772776 (-0.00 %)
Wait states: 0 -> 0 (0.00 %)

Totals from affected shaders:
SGPRS: 176 -> 176 (0.00 %)
VGPRS: 144 -> 156 (8.33 %)
Spilled SGPRs: 0 -> 0 (0.00 %)
Spilled VGPRs: 0 -> 0 (0.00 %)
Private memory VGPRs: 0 -> 0 (0.00 %)
Scratch size: 0 -> 0 (0.00 %) dwords per thread
Code Size: 12104 -> 12200 (0.79 %) bytes
LDS: 0 -> 0 (0.00 %) blocks
Max Waves: 28 -> 25 (-10.71 %)
Wait states: 0 -> 0 (0.00 %)

The few small regressions are due to nir_opt_large_constants kicking in
when indirect lowering happens to result in smaller code after
optimization since the array is very simple.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
This commit is contained in:
Connor Abbott 2019-09-02 11:57:34 +02:00
parent 7d2d7b5d5f
commit 49503ae74e
1 changed files with 1 additions and 17 deletions
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18
src/mesa/state_tracker/st_glsl_to_nir.cpp
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@ -596,26 +596,10 @@ st_nir_link_shaders(nir_shader **producer, nir_shader **consumer, bool scalar)
NIR_PASS_V(*producer, nir_lower_global_vars_to_local);
NIR_PASS_V(*consumer, nir_lower_global_vars_to_local);
/* The backend might not be able to handle indirects on
* temporaries so we need to lower indirects on any of the
* varyings we have demoted here.
*
* TODO: radeonsi shouldn't need to do this, however LLVM isn't
* currently smart enough to handle indirects without causing excess
* spilling causing the gpu to hang.
*
* See the following thread for more details of the problem:
* https://lists.freedesktop.org/archives/mesa-dev/2017-July/162106.html
*/
nir_variable_mode indirect_mask = nir_var_function_temp;
NIR_PASS_V(*producer, nir_lower_indirect_derefs, indirect_mask);
NIR_PASS_V(*consumer, nir_lower_indirect_derefs, indirect_mask);
st_nir_opts(*producer, scalar);
st_nir_opts(*consumer, scalar);
/* Lowering indirects can cause varying to become unused.
/* Optimizations can cause varyings to become unused.
* nir_compact_varyings() depends on all dead varyings being removed so
* we need to call nir_remove_dead_variables() again here.
*/