From ccb14900459a42cc275a836ed21752aec03bd88a Mon Sep 17 00:00:00 2001
From: Martijn Courteaux <courteauxmartijn@gmail.com>
Date: Thu, 7 Aug 2025 19:29:19 +0200
Subject: [PATCH] Always insert set_host_dirty(), even is there is no GPU
 target. This allows mixing CPU-only and GPU-compatible pipelines.

---
 src/Lower.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Lower.cpp b/src/Lower.cpp
index 19be543975f1..1e1f8b40fc9f 100644
--- a/src/Lower.cpp
+++ b/src/Lower.cpp
@@ -326,6 +326,10 @@ void lower_impl(const vector<Function> &output_funcs,
         debug(1) << "Selecting a GPU API for extern stages...\n";
         s = select_gpu_api(s, t);
         log("Lowering after selecting a GPU API for extern stages:", s);
+    } else {
+        debug(1) << "Injecting host-dirty marking...\n";
+        s = inject_host_dev_buffer_copies(s, t);
+        log("Lowering after injecting host-dirty marking:", s);
     }
 
     debug(1) << "Simplifying...\n";