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radv: Use NIR optimization to move discards to the top. 

Fossil stats on Sienna Cichlid:

Totals from 1988 (1.55% of 128653) affected shaders:
VGPRs: 68096 -> 67928 (-0.25%); split: -0.61%, +0.36%
CodeSize: 5391936 -> 5391312 (-0.01%); split: -0.11%, +0.10%
MaxWaves: 53020 -> 52946 (-0.14%); split: +0.05%, -0.19%
Instrs: 992413 -> 992509 (+0.01%); split: -0.10%, +0.11%
Latency: 8643141 -> 8789295 (+1.69%); split: -0.31%, +2.00%
InvThroughput: 1680195 -> 1680605 (+0.02%); split: -0.04%, +0.07%
SClause: 50886 -> 51318 (+0.85%); split: -0.73%, +1.57%
Copies: 57017 -> 56741 (-0.48%); split: -1.28%, +0.80%
PreSGPRs: 66766 -> 67048 (+0.42%); split: -0.24%, +0.66%
PreVGPRs: 56832 -> 56935 (+0.18%); split: -0.44%, +0.62%

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13037>
This commit is contained in:
Timur Kristóf 2022-05-02 14:26:54 +02:00 committed by Marge Bot
parent 1b4784c5fb
commit ff13fc381d
1 changed files with 7 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
src/amd/vulkan/radv_shader.c
View File

@ -214,7 +214,13 @@ radv_optimize_nir(struct nir_shader *shader, bool optimize_conservatively, bool
NIR_PASS(progress, shader, nir_opt_shrink_vectors);
NIR_PASS(progress, shader, nir_remove_dead_variables,
nir_var_function_temp | nir_var_shader_in | nir_var_shader_out, NULL);
NIR_PASS(progress, shader, nir_opt_conditional_discard);
if (shader->info.stage == MESA_SHADER_FRAGMENT &&
(shader->info.fs.uses_discard || shader->info.fs.uses_demote)) {
NIR_PASS(progress, shader, nir_opt_conditional_discard);
NIR_PASS(progress, shader, nir_opt_move_discards_to_top);
}
NIR_PASS(progress, shader, nir_opt_move, nir_move_load_ubo);
}