From b0a2a0af75768d09ff138c87585cd9640986f114 Mon Sep 17 00:00:00 2001
From: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Date: Wed, 3 Feb 2021 14:35:02 -0500
Subject: [PATCH] pan/bi: Respect side effects in DCE

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8848>
---
 src/panfrost/bifrost/bi_opt_dce.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/panfrost/bifrost/bi_opt_dce.c b/src/panfrost/bifrost/bi_opt_dce.c
index 517ff11fcc3..589198e4738 100644
--- a/src/panfrost/bifrost/bi_opt_dce.c
+++ b/src/panfrost/bifrost/bi_opt_dce.c
@@ -48,7 +48,7 @@ bi_opt_dead_code_eliminate(bi_context *ctx, bi_block *block, bool soft)
                 unsigned index = bi_get_node(ins->dest[0]);
 
                 if (index < temp_count && !live[index]) {
-                        if (soft)
+                        if (soft || bi_side_effects(ins->op))
                                 ins->dest[0] = bi_null();
                         else
                                 bi_remove_instruction(ins);