[llvm] [DXIL] Add DXIL version-specific TableGen specification and implementation of DXIL Ops (PR #97593)

[Chris B via llvm-commits]

================
@@ -249,17 +309,95 @@ static FunctionType *getDXILOpFunctionType(const OpCodeProperty *Prop,
       ArgTys[0], ArrayRef<Type *>(&ArgTys[1], ArgTys.size() - 1), false);
 }
 
+/// Get index of the property from PropList valid for the most recent
+/// DXIL version not greater than DXILVer.
+/// PropList is expected to be sorted in ascending order of DXIL version.
+template <typename T>
+static int getPropIndex(const std::vector<T> PropList,
+                        const VersionTuple DXILVer) {
+  auto Size = PropList.size();
+  for (int I = Size - 1; I >= 0; I--) {
+    auto OL = PropList[I];
+    if (VersionTuple(OL.DXILVersion.Major, OL.DXILVersion.Minor) <= DXILVer) {
+      return I;
+    }
+  }
+  report_fatal_error(Twine(DXILVer.getAsString()) + ": Unknown DXIL Version",
+                     /*gen_crash_diag*/ false);
+
+  return -1;
+}
+
 namespace llvm {
 namespace dxil {
 
+// No extra checks on TargetTripleStr need be performed to verify that the
+// Triple is well-formed or that the target is supported since these checks
+// would have been done at the time the module M is constructed in the earlier
+// stages of compilation.
+DXILOpBuilder::DXILOpBuilder(Module &M, IRBuilderBase &B)
+    : M(M), B(B), TargetTripleStr(M.getTargetTriple()) {}
+
 CallInst *DXILOpBuilder::createDXILOpCall(dxil::OpCode OpCode, Type *ReturnTy,
                                           Type *OverloadTy,
                                           SmallVector<Value *> Args) {
+
+  auto Major = Triple(TargetTripleStr).getDXILVersion().getMajor();
+  auto MinorOrErr = Triple(TargetTripleStr).getDXILVersion().getMinor();
+  uint32_t Minor = MinorOrErr.has_value() ? *MinorOrErr : 0;
+  VersionTuple DXILVer(Major, Minor);
----------------
llvm-beanz wrote:

```suggestion
  VersionTuple DXILVer = Triple(TargetTripleStr).getDXILVersion();
```

https://github.com/llvm/llvm-project/pull/97593