[llvm] [DXIL] Model DXIL Class and Shader Model association of DXIL Ops in DXIL.td (PR #87803)

[S. Bharadwaj Yadavalli via llvm-commits]

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@@ -172,9 +176,34 @@ DXILOperationDesc::DXILOperationDesc(const Record *R) {
   if (!OverloadParamIndices.empty()) {
     if (OverloadParamIndices.size() > 1)
       report_fatal_error("Multiple overload type specification not supported",
-                         false);
+                         /*gen_crash_diag*/ false);
     OverloadParamIndex = OverloadParamIndices[0];
   }
+
+  // Get valid overload types of the Operation
+  std::vector<Record *> OverloadTypeRecs =
+      R->getValueAsListOfDefs("OpOverloadTypes");
+  // Sort records in ascending order of Shader Model version
+  std::sort(OverloadTypeRecs.begin(), OverloadTypeRecs.end(),
+            [](Record *RecA, Record *RecB) {
+              uint16_t RecAMaj =
+                  RecA->getValueAsDef("ShaderModel")->getValueAsInt("Major");
+              uint16_t RecAMin =
+                  RecA->getValueAsDef("ShaderModel")->getValueAsInt("Minor");
+              uint16_t RecBMaj =
+                  RecB->getValueAsDef("ShaderModel")->getValueAsInt("Major");
+              uint16_t RecBMin =
+                  RecB->getValueAsDef("ShaderModel")->getValueAsInt("Minor");
+
+              return (COMPUTE_SM_VERSION_VALUE(RecAMaj, RecAMin) <
+                      COMPUTE_SM_VERSION_VALUE(RecBMaj, RecBMin));
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bharadwajy wrote:

> This can be simplified with `std::tie`

Changed to compare `VersionTuple` typed values.

https://github.com/llvm/llvm-project/pull/87803