Mesa (main): radv: Run algebraic optimizations before NGG lowering.

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Module: Mesa
Branch: main
Commit: d18920e03a991064c265634029190c4e56e8af9c
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=d18920e03a991064c265634029190c4e56e8af9c

Author: Timur Kristóf <timur.kristof at gmail.com>
Date:   Tue Jul  6 08:45:33 2021 +0200

radv: Run algebraic optimizations before NGG lowering.

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 at gmail.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset at 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 96bdb2cabc4..df8f47d85b1 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,