From 2537a53d5cc1f992366c9b7c5ea2781cc7913f5a Mon Sep 17 00:00:00 2001
From: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Date: Wed, 6 Jan 2021 17:39:44 -0500
Subject: [PATCH] pan/bi: Add writes_reg predicate

ATEST is a bit of a wrinkle in this, so let's keep it in one place.

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/8354>
---
 src/panfrost/bifrost/bi_schedule.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/panfrost/bifrost/bi_schedule.c b/src/panfrost/bifrost/bi_schedule.c
index b9ab2cbb283..d1a9cd4d934 100644
--- a/src/panfrost/bifrost/bi_schedule.c
+++ b/src/panfrost/bifrost/bi_schedule.c
@@ -666,6 +666,17 @@ bi_has_cross_passthrough_hazard(bi_tuple *succ, bi_instr *ins)
         return false;
 }
 
+/* Is a register written other than the staging mechanism? ATEST is special,
+ * writing to both a staging register and a regular register (fixed packing)*/
+
+static bool
+bi_writes_reg(bi_instr *instr)
+{
+        return (instr->op == BI_OPCODE_ATEST) ||
+                (!bi_is_null(instr->dest[0]) &&
+                 !bi_opcode_props[instr->op].sr_write);
+}
+
 #ifndef NDEBUG
 
 static bi_builder *