From be95198de58b87cffff20de1ecd73635c28ff95e Mon Sep 17 00:00:00 2001
From: Alyssa Rosenzweig <alyssa@collabora.com>
Date: Wed, 21 Jul 2021 10:55:47 -0400
Subject: [PATCH] pan/bi: DCE after bifrost_nir_lower_algebraic_late

Needed for sat_signed to fuse, since we run modifier prop before backend
DCE.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12026>
---
 src/panfrost/bifrost/bifrost_compile.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/panfrost/bifrost/bifrost_compile.c b/src/panfrost/bifrost/bifrost_compile.c
index 231490ac0c5..b5ac6e84044 100644
--- a/src/panfrost/bifrost/bifrost_compile.c
+++ b/src/panfrost/bifrost/bifrost_compile.c
@@ -3279,6 +3279,7 @@ bi_optimize_nir(nir_shader *nir, unsigned gpu_id, bool is_blend)
 
         /* Prepass to simplify instruction selection */
         NIR_PASS(progress, nir, bifrost_nir_lower_algebraic_late);
+        NIR_PASS(progress, nir, nir_opt_dce);
 
         /* Backend scheduler is purely local, so do some global optimizations
          * to reduce register pressure. */