[Mesa-dev] [PATCH v2 3/3] i965/anv: use nir_opt_vectorize_io()

[Timothy Arceri]

Commit 8d8222461f9d7f49 caused substantially more URB messages in
geometry and tessellation shaders (due to enabling
nir_lower_io_to_scalar_early). This combines io again to avoid
this regression while still allowing link time optimisation of
components.

Shader-db results (SKL):

total instructions in shared programs: 13109035 -> 13107191 (-0.01%)
instructions in affected programs: 66278 -> 64434 (-2.78%)
helped: 242
HURT: 13

total cycles in shared programs: 332090418 -> 332094364 (<.01%)
cycles in affected programs: 285477 -> 289423 (1.38%)
helped: 39
HURT: 215

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107510
---
 src/intel/vulkan/anv_pipeline.c        | 6 ++++++
 src/mesa/drivers/dri/i965/brw_link.cpp | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/src/intel/vulkan/anv_pipeline.c b/src/intel/vulkan/anv_pipeline.c
index 7c9b1230115..63acb3cc25e 100644
--- a/src/intel/vulkan/anv_pipeline.c
+++ b/src/intel/vulkan/anv_pipeline.c
@@ -1016,6 +1016,12 @@ anv_pipeline_compile_graphics(struct anv_pipeline *pipeline,
 
       void *stage_ctx = ralloc_context(NULL);
 
+      if (nir_opt_vectorize_io(stages[s].nir)) {
+         brw_nir_optimize(stages[s].nir, compiler,
+                          compiler->scalar_stage[stages[s].nir->info.stage],
+                          false);
+      }
+
       anv_pipeline_lower_nir(pipeline, stage_ctx, &stages[s], layout);
 
       const unsigned *code;
diff --git a/src/mesa/drivers/dri/i965/brw_link.cpp b/src/mesa/drivers/dri/i965/brw_link.cpp
index 2cbb1e0b879..0bcd73af04c 100644
--- a/src/mesa/drivers/dri/i965/brw_link.cpp
+++ b/src/mesa/drivers/dri/i965/brw_link.cpp
@@ -319,6 +319,12 @@ brw_link_shader(struct gl_context *ctx, struct gl_shader_program *shProg)
 
       struct gl_program *prog = shader->Program;
 
+      if (nir_opt_vectorize_io(prog->nir)) {
+         brw_nir_optimize(prog->nir, compiler,
+                          compiler->scalar_stage[prog->info.stage],
+                          false);
+      }
+
       _mesa_update_shader_textures_used(shProg, prog);
 
       brw_shader_gather_info(prog->nir, prog);
-- 
2.17.2