early-access version 1255

externals/dynarmic/src/ir_opt/dead_code_elimination_pass.cpp

@@ -0,0 +1,22 @@
+/* This file is part of the dynarmic project.
+ * Copyright (c) 2016 MerryMage
+ * SPDX-License-Identifier: 0BSD
+ */
+
+#include "common/iterator_util.h"
+#include "frontend/ir/basic_block.h"
+#include "ir_opt/passes.h"
+
+namespace Dynarmic::Optimization {
+
+void DeadCodeElimination(IR::Block& block) {
+    // We iterate over the instructions in reverse order.
+    // This is because removing an instruction reduces the number of uses for earlier instructions.
+    for (auto& inst : Common::Reverse(block)) {
+        if (!inst.HasUses() && !inst.MayHaveSideEffects()) {
+            inst.Invalidate();
+        }
+    }
+}
+
+} // namespace Dynarmic