[Passes] Manage extra passes using inner pass managers (NFC). (#119348)

As suggested post-commit for
#118323, adjust the extra pass
managers to no inherit from Function/LoopPassManager, but manage the
extra passes via member pass managers.

PR: #119348

Author: fhahn

llvm/include/llvm/Transforms/Utils/ExtraPassManager.h

@@ -55,29 +55,49 @@ template <typename MarkerTy> struct ShouldRunExtraPasses {
 /// request additional transformations on demand. An example is extra
 /// simplifications after loop-vectorization, if runtime checks have been added.
 template <typename MarkerTy>
-struct ExtraFunctionPassManager : public FunctionPassManager {
+class ExtraFunctionPassManager
+    : public PassInfoMixin<ExtraFunctionPassManager<MarkerTy>> {
+  FunctionPassManager InnerFPM;
+
+public:
+  template <typename PassT> void addPass(PassT &&Pass) {
+    InnerFPM.addPass(std::move(Pass));
+  }
+
   PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM) {
     auto PA = PreservedAnalyses::all();
     if (AM.getCachedResult<MarkerTy>(F))
-      PA.intersect(FunctionPassManager::run(F, AM));
+      PA.intersect(InnerFPM.run(F, AM));
     PA.abandon<MarkerTy>();
     return PA;
   }
+
+  static bool isRequired() { return true; }
 };
 
 /// A pass manager to run a set of extra loop passes if the MarkerTy analysis is
 /// present. This allows passes to request additional transformations on demand.
 /// An example is doing additional runs of SimpleLoopUnswitch.
 template <typename MarkerTy>
-struct ExtraLoopPassManager : public LoopPassManager {
+class ExtraLoopPassManager
+    : public PassInfoMixin<ExtraLoopPassManager<MarkerTy>> {
+  LoopPassManager InnerLPM;
+
+public:
+  template <typename PassT> void addPass(PassT &&Pass) {
+    InnerLPM.addPass(std::move(Pass));
+  }
+
   PreservedAnalyses run(Loop &L, LoopAnalysisManager &AM,
                         LoopStandardAnalysisResults &AR, LPMUpdater &U) {
     auto PA = PreservedAnalyses::all();
     if (AM.getCachedResult<MarkerTy>(L))
-      PA.intersect(LoopPassManager::run(L, AM, AR, U));
+      PA.intersect(InnerLPM.run(L, AM, AR, U));
     PA.abandon<MarkerTy>();
     return PA;
   }
+
+  static bool isRequired() { return true; }
 };
 
 } // namespace llvm

llvm/lib/Passes/PassRegistry.def

@@ -366,6 +366,8 @@ FUNCTION_PASS("dwarf-eh-prepare", DwarfEHPreparePass(TM))
 FUNCTION_PASS("expand-large-div-rem", ExpandLargeDivRemPass(TM))
 FUNCTION_PASS("expand-large-fp-convert", ExpandLargeFpConvertPass(TM))
 FUNCTION_PASS("expand-memcmp", ExpandMemCmpPass(TM))
+FUNCTION_PASS("extra-vector-passes",
+                  ExtraFunctionPassManager<ShouldRunExtraVectorPasses>())
 FUNCTION_PASS("fix-irreducible", FixIrreduciblePass())
 FUNCTION_PASS("flatten-cfg", FlattenCFGPass())
 FUNCTION_PASS("float2int", Float2IntPass())
@@ -651,6 +653,8 @@ LOOP_ANALYSIS("should-run-extra-simple-loop-unswitch",
 LOOP_PASS("canon-freeze", CanonicalizeFreezeInLoopsPass())
 LOOP_PASS("dot-ddg", DDGDotPrinterPass())
 LOOP_PASS("guard-widening", GuardWideningPass())
+LOOP_PASS("extra-simple-loop-unswitch-passes",
+              ExtraLoopPassManager<ShouldRunExtraSimpleLoopUnswitch>())
 LOOP_PASS("indvars", IndVarSimplifyPass())
 LOOP_PASS("invalidate<all>", InvalidateAllAnalysesPass())
 LOOP_PASS("loop-bound-split", LoopBoundSplitPass())