[clang] [llvm] CodeGen: Add LibcallLoweringInfo analysis pass (PR #168622)

[Sergei Barannikov via llvm-commits]

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@@ -1126,13 +1134,29 @@ PreservedAnalyses ExpandFpPass::run(Function &F, FunctionAnalysisManager &FAM) {
   AssumptionCache *AC = nullptr;
   if (OptLevel != CodeGenOptLevel::None)
     AC = &FAM.getResult<AssumptionAnalysis>(F);
-  return runImpl(F, TLI, AC) ? PreservedAnalyses::none()
-                             : PreservedAnalyses::all();
+
+  auto &MAMProxy = FAM.getResult<ModuleAnalysisManagerFunctionProxy>(F);
+
+  const LibcallLoweringModuleAnalysisResult *LibcallLowering =
+      MAMProxy.getCachedResult<LibcallLoweringModuleAnalysis>(*F.getParent());
+
+  if (!LibcallLowering) {
+    F.getContext().emitError("'" + LibcallLoweringModuleAnalysis::name() +
+                             "' analysis required");
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s-barannikov wrote:

If it is required, why don't add it to required passes?

https://github.com/llvm/llvm-project/pull/168622