From 099de8dea62cbf17c8e06a6c24e72b38475d1566 Mon Sep 17 00:00:00 2001
From: nmzik <Nmzik@mail.ru>
Date: Sun, 18 Oct 2026 16:17:51 +0200
Subject: [PATCH] graphics: publish each PM4 WRITE_DATA word exactly once

---
 src/graphics/guest_gpu/graphicsRun.cpp | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/src/graphics/guest_gpu/graphicsRun.cpp b/src/graphics/guest_gpu/graphicsRun.cpp
index 7863836c4..41aeee369 100644
--- a/src/graphics/guest_gpu/graphicsRun.cpp
+++ b/src/graphics/guest_gpu/graphicsRun.cpp
@@ -343,12 +343,11 @@ void CommandProcessor::WriteData(uint32_t* dst, const uint32_t* src, uint32_t dw
 		return;
 	}
 
-	if (write_one_address) {
-		for (uint32_t i = 0; i < dw_num; i++) {
-			dst[0] = src[i];
-		}
-	} else {
-		memcpy(dst, src, static_cast<size_t>(dw_num) * sizeof(uint32_t));
+	// Completion labels can be reused immediately; memcpy may write a destination twice.
+	auto* output = static_cast<volatile uint32_t*>(dst);
+	for (uint32_t i = 0; i < dw_num; i++) {
+		*output = src[i];
+		output += !write_one_address;
 	}
 }