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 <mattst88@gmail.com>

diff --git a/src/mesa/drivers/dri/i965/brw_fs_nir.cpp b/src/mesa/drivers/dri/i965/brw_fs_nir.cpp
index 94641cf2ec1e00ec21e02013ae7fbfdb2b244e86..4dfb4d693aeb68a5615aa3f5352f31d8aa338917 100644 (file)
--- 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);