From d18920e03a991064c265634029190c4e56e8af9c Mon Sep 17 00:00:00 2001
From: =?utf8?q?Timur=20Krist=C3=B3f?= <timur.kristof@gmail.com>
Date: Tue, 6 Jul 2021 08:45:33 +0200
Subject: [PATCH] radv: Run algebraic optimizations before NGG lowering.
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This makes culling shaders more efficient because they split the
shader in two parts. It is better to optimize before this split
happens.

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10525>
---
 src/amd/vulkan/radv_shader.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/amd/vulkan/radv_shader.c b/src/amd/vulkan/radv_shader.c
index 96bdb2c..df8f47d 100644
--- a/src/amd/vulkan/radv_shader.c
+++ b/src/amd/vulkan/radv_shader.c
@@ -1001,6 +1001,9 @@ void radv_lower_ngg(struct radv_device *device, struct nir_shader *nir,
        nir->info.stage == MESA_SHADER_TESS_EVAL) {
       assert(key->vs_common_out.as_ngg);
 
+      if (consider_culling)
+         radv_optimize_nir_algebraic(nir, false);
+
       out_conf =
          ac_nir_lower_ngg_nogs(
             nir,
-- 
2.7.4