From 316d3a3f95144ed987d6fca6ba43a3b0b8bf5354 Mon Sep 17 00:00:00 2001
From: Gert Wollny <gert.wollny@collabora.com>
Date: Wed, 2 Jul 2025 11:54:20 +0200
Subject: [PATCH] r600/sfn: reuse readport for already loaded registers

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36572>
---
 .../drivers/r600/sfn/sfn_alu_readport_validation.cpp       | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/gallium/drivers/r600/sfn/sfn_alu_readport_validation.cpp b/src/gallium/drivers/r600/sfn/sfn_alu_readport_validation.cpp
index 6dbf7526f62..91d348971ae 100644
--- a/src/gallium/drivers/r600/sfn/sfn_alu_readport_validation.cpp
+++ b/src/gallium/drivers/r600/sfn/sfn_alu_readport_validation.cpp
@@ -163,6 +163,13 @@ AluReadportReservation::AluReadportReservation()
 bool
 AluReadportReservation::reserve_gpr(int sel, int chan, int cycle)
 {
+   for (int c = 0; c < 3; ++c) {
+      if (m_hw_gpr[c][chan] == sel) {
+         if (cycle == c)
+            return true;
+      }
+   }
+
    if (m_hw_gpr[cycle][chan] == -1) {
       m_hw_gpr[cycle][chan] = sel;
    } else if (m_hw_gpr[cycle][chan] != sel) {