1 files changed, 36 insertions, 0 deletions

diff --git a/contrib/llvm-project/llvm/lib/Transforms/Utils/DXILUpgrade.cpp b/contrib/llvm-project/llvm/lib/Transforms/Utils/DXILUpgrade.cpp
new file mode 100644
index 000000000000..735686ddce38
--- /dev/null
+++ b/contrib/llvm-project/llvm/lib/Transforms/Utils/DXILUpgrade.cpp
@@ -0,0 +1,36 @@
+//===- DXILUpgrade.cpp - Upgrade DXIL metadata to LLVM constructs ---------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Transforms/Utils/DXILUpgrade.h"
+
+using namespace llvm;
+
+static bool handleValVerMetadata(Module &M) {
+  NamedMDNode *ValVer = M.getNamedMetadata("dx.valver");
+  if (!ValVer)
+    return false;
+
+  // We don't need the validation version internally, so we drop it.
+  ValVer->dropAllReferences();
+  ValVer->eraseFromParent();
+  return true;
+}
+
+PreservedAnalyses DXILUpgradePass::run(Module &M, ModuleAnalysisManager &AM) {
+  PreservedAnalyses PA;
+  // We never add, remove, or change functions here.
+  PA.preserve<FunctionAnalysisManagerModuleProxy>();
+  PA.preserveSet<AllAnalysesOn<Function>>();
+
+  bool Changed = false;
+  Changed |= handleValVerMetadata(M);
+
+  if (!Changed)
+    return PreservedAnalyses::all();
+  return PA;
+}