Get dxil version from subarch.

Author: python3kgae

llvm/lib/Target/DirectX/DXILMetadata.cpp

@@ -82,13 +82,47 @@ void dxil::createShaderModelMD(Module &M) {
 }
 
 void dxil::createDXILVersionMD(Module &M) {
-  Triple TT(M.getTargetTriple());
-  VersionTuple Ver = TT.getOSVersion();
+  Triple TT(Triple::normalize(M.getTargetTriple()));
+  VersionTuple Ver = VersionTuple(1, 0);
+  switch (TT.getSubArch()) {
+  case Triple::DXILSubArch_v1_0:
+    Ver = VersionTuple(1, 0);
+    break;
+  case Triple::DXILSubArch_v1_1:
+    Ver = VersionTuple(1, 1);
+    break;
+  case Triple::DXILSubArch_v1_2:
+    Ver = VersionTuple(1, 2);
+    break;
+  case Triple::DXILSubArch_v1_3:
+    Ver = VersionTuple(1, 3);
+    break;
+  case Triple::DXILSubArch_v1_4:
+    Ver = VersionTuple(1, 4);
+    break;
+  case Triple::DXILSubArch_v1_5:
+    Ver = VersionTuple(1, 5);
+    break;
+  case Triple::DXILSubArch_v1_6:
+    Ver = VersionTuple(1, 6);
+    break;
+  case Triple::DXILSubArch_v1_7:
+    Ver = VersionTuple(1, 7);
+    break;
+  case Triple::DXILSubArch_v1_8:
+    Ver = VersionTuple(1, 8);
+    break;
+  case Triple::NoSubArch:
+    break;
+  default:
+    llvm_unreachable("Unsupported subarch for DXIL generation.");
+    break;
+  }
   LLVMContext &Ctx = M.getContext();
   IRBuilder<> B(Ctx);
   NamedMDNode *Entry = M.getOrInsertNamedMetadata("dx.version");
   Metadata *Vals[2];
-  Vals[0] = ConstantAsMetadata::get(B.getInt32(1));
+  Vals[0] = ConstantAsMetadata::get(B.getInt32(Ver.getMajor()));
   Vals[1] = ConstantAsMetadata::get(B.getInt32(Ver.getMinor().value_or(0)));
   Entry->addOperand(MDNode::get(Ctx, Vals));
 }