[Mesa-dev] [PATCH] radv: use nir_opt_copy_prop_vars and nir_opt_dead_write_vars

[Timothy Arceri]

Totals from affected shaders:
SGPRS: 2856 -> 2856 (0.00 %)
VGPRS: 3236 -> 3248 (0.37 %)
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: 236560 -> 233548 (-1.27 %) bytes
LDS: 0 -> 0 (0.00 %) blocks
Max Waves: 277 -> 283 (2.17 %)
Wait states: 0 -> 0 (0.00 %)

Even in the cases were we have increased VGPR use it appears
the NIR is improved significantly.
---
 src/amd/vulkan/radv_shader.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/amd/vulkan/radv_shader.c b/src/amd/vulkan/radv_shader.c
index 3e3eb96a531..3b3422c8da6 100644
--- a/src/amd/vulkan/radv_shader.c
+++ b/src/amd/vulkan/radv_shader.c
@@ -127,6 +127,10 @@ radv_optimize_nir(struct nir_shader *shader, bool optimize_conservatively)
 
                 NIR_PASS_V(shader, nir_lower_vars_to_ssa);
 		NIR_PASS_V(shader, nir_lower_pack);
+
+		NIR_PASS(progress, shader, nir_opt_copy_prop_vars);
+		NIR_PASS(progress, shader, nir_opt_dead_write_vars);
+
                 NIR_PASS_V(shader, nir_lower_alu_to_scalar);
                 NIR_PASS_V(shader, nir_lower_phis_to_scalar);
 
-- 
2.17.1