[llvm] [NewPM/CodeGen] Rewrite pass manager nesting (PR #81068)

[via llvm-commits]

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@@ -182,49 +147,53 @@ int llvm::compileModuleWithNewPM(
       return 1;
     }
 
-    ExitOnErr(PB.parsePassPipeline(MFPM, PassPipeline));
+    ExitOnErr(PB.parsePassPipeline(MPM, PassPipeline));
     MPM.addPass(PrintMIRPreparePass(*OS));
+    MachineFunctionPassManager MFPM;
     MFPM.addPass(PrintMIRPass(*OS));
     MFPM.addPass(FreeMachineFunctionPass());
+    MPM.addPass(createModuleToMachineFunctionPassAdaptor(std::move(MFPM)));
 
-    auto &MMI = MFAM.getResult<MachineModuleAnalysis>(*M).getMMI();
     if (MIR->parseMachineFunctions(*M, MMI))
       return 1;
   } else {
-    ExitOnErr(LLVMTM.buildCodeGenPipeline(MPM, MFPM, MFAM, *OS,
-                                          DwoOut ? &DwoOut->os() : nullptr,
-                                          FileType, Opt, &PIC));
+    ExitOnErr(LLVMTM.buildCodeGenPipeline(
+        MPM, *OS, DwoOut ? &DwoOut->os() : nullptr, FileType, Opt, &PIC));
 
     auto StartStopInfo = TargetPassConfig::getStartStopInfo(PIC);
     assert(StartStopInfo && "Expect StartStopInfo!");
 
     if (auto StopPassName = StartStopInfo->StopPass; !StopPassName.empty()) {
-      MFPM.addPass(PrintMIRPass(*OS));
-      MFPM.addPass(FreeMachineFunctionPass());
+      MPM.addPass(createModuleToMachineFunctionPassAdaptor(PrintMIRPass(*OS)));
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paperchalice wrote:

Could we move this part to CodeGenPassBuilder? Thus we can print the complete MIR.

https://github.com/llvm/llvm-project/pull/81068