[HLSL] Emit a version in the dx.rootsignatures metadata (#145113)

In #144957 the backend was updated to expect a version in the metadata,
but since the frontend wasn't updated this breaks compilation. This is a
somewhat temporary fix to that until #144813 lands.

1 files changed, 8 insertions, 3 deletions

diff --git a/clang/lib/CodeGen/CGHLSLRuntime.cpp b/clang/lib/CodeGen/CGHLSLRuntime.cpp
index 34960c3..3103f17 100644
--- a/clang/lib/CodeGen/CGHLSLRuntime.cpp
+++ b/clang/lib/CodeGen/CGHLSLRuntime.cpp
@@ -72,12 +72,17 @@ void addRootSignature(ArrayRef<llvm::hlsl::rootsig::RootElement> Elements,
 
   llvm::hlsl::rootsig::MetadataBuilder Builder(Ctx, Elements);
   MDNode *RootSignature = Builder.BuildRootSignature();
-  MDNode *FnPairing =
-      MDNode::get(Ctx, {ValueAsMetadata::get(Fn), RootSignature});
+
+  // TODO: We need to wire the root signature version up through the frontend
+  // rather than hardcoding it.
+  ConstantAsMetadata *Version =
+      ConstantAsMetadata::get(ConstantInt::get(llvm::Type::getInt32Ty(Ctx), 2));
+  MDNode *MDVals =
+      MDNode::get(Ctx, {ValueAsMetadata::get(Fn), RootSignature, Version});
 
   StringRef RootSignatureValKey = "dx.rootsignatures";
   auto *RootSignatureValMD = M.getOrInsertNamedMetadata(RootSignatureValKey);
-  RootSignatureValMD->addOperand(FnPairing);
+  RootSignatureValMD->addOperand(MDVals);
 }
 
 } // namespace