i965/nir: Run DCE again before going out of SSA

We run lowering and optimization passes that might leave garbage lying
around. This keeps the FS cse from having to clean it up.

Reviewed-by: Matt Turner <[email protected]>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
index 94641cf2ec1..4dfb4d693ae 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
@@ -163,6 +163,8 @@ fs_visitor::emit_nir_code()
    nir_validate_shader(nir);
    nir_copy_prop(nir);
    nir_validate_shader(nir);
+   nir_opt_dce(nir);
+   nir_validate_shader(nir);
 
    if (unlikely(debug_enabled)) {
       fprintf(stderr, "NIR (SSA form) for %s shader:\n", stage_name);