[PM] Replace the Pass argument to SplitEdge with specific analyses used

and updated.

This may appear to remove handling for things like alias analysis when
splitting critical edges here, but in fact no callers of SplitEdge
relied on this. Similarly, all of them wanted to preserve LCSSA if there
was any update of the loop info. That makes the interface much simpler.

With this, all of BasicBlockUtils.h is free of Pass arguments and
prepared for the new pass manager. This is tho majority of utilities
that relied on pass arguments.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226459 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Transforms/Utils/BasicBlockUtils.h

@@ -28,7 +28,6 @@ class DominatorTree;
 class LoopInfo;
 class Instruction;
 class MDNode;
-class Pass;
 class ReturnInst;
 class TargetLibraryInfo;
 class TerminatorInst;
@@ -191,9 +190,9 @@ unsigned SplitAllCriticalEdges(Function &F,
                                const CriticalEdgeSplittingOptions &Options =
                                    CriticalEdgeSplittingOptions());
 
-/// SplitEdge -  Split the edge connecting specified block. Pass P must
-/// not be NULL.
-BasicBlock *SplitEdge(BasicBlock *From, BasicBlock *To, Pass *P);
+/// SplitEdge -  Split the edge connecting specified block.
+BasicBlock *SplitEdge(BasicBlock *From, BasicBlock *To,
+                      DominatorTree *DT = nullptr, LoopInfo *LI = nullptr);
 
 /// SplitBlock - Split the specified block at the specified instruction - every
 /// thing before SplitPt stays in Old and everything starting with SplitPt moves

lib/Target/XCore/XCoreLowerThreadLocal.cpp

@@ -137,7 +137,7 @@ static bool replaceConstantExprOp(ConstantExpr *CE, Pass *P) {
             if (PN->getIncomingValue(I) == CE) {
               BasicBlock *PredBB = PN->getIncomingBlock(I);
               if (PredBB->getTerminator()->getNumSuccessors() > 1)
-                PredBB = SplitEdge(PredBB, PN->getParent(), P);
+                PredBB = SplitEdge(PredBB, PN->getParent());
               Instruction *InsertPos = PredBB->getTerminator();
               Instruction *NewInst = createReplacementInstr(CE, InsertPos);
               PN->setOperand(I, NewInst);

lib/Transforms/Instrumentation/DataFlowSanitizer.cpp

@@ -1532,7 +1532,7 @@ void DFSanVisitor::visitCallSite(CallSite CS) {
         Next = II->getNormalDest()->begin();
       } else {
         BasicBlock *NewBB =
-            SplitEdge(II->getParent(), II->getNormalDest(), &DFSF.DFS);
+            SplitEdge(II->getParent(), II->getNormalDest(), &DFSF.DT);
         Next = NewBB->begin();
       }
     } else {

lib/Transforms/Scalar/JumpThreading.cpp

@@ -1575,7 +1575,7 @@ bool JumpThreading::DuplicateCondBranchOnPHIIntoPred(BasicBlock *BB,
   BranchInst *OldPredBranch = dyn_cast<BranchInst>(PredBB->getTerminator());
 
   if (!OldPredBranch || !OldPredBranch->isUnconditional()) {
-    PredBB = SplitEdge(PredBB, BB, this);
+    PredBB = SplitEdge(PredBB, BB);
     OldPredBranch = cast<BranchInst>(PredBB->getTerminator());
   }
 

lib/Transforms/Scalar/LoopUnswitch.cpp

@@ -727,7 +727,7 @@ void LoopUnswitch::UnswitchTrivialCondition(Loop *L, Value *Cond,
   // First step, split the preheader, so that we know that there is a safe place
   // to insert the conditional branch.  We will change loopPreheader to have a
   // conditional branch on Cond.
-  BasicBlock *NewPH = SplitEdge(loopPreheader, loopHeader, this);
+  BasicBlock *NewPH = SplitEdge(loopPreheader, loopHeader, DT, LI);
 
   // Now that we have a place to insert the conditional branch, create a place
   // to branch to: this is the exit block out of the loop that we should
@@ -801,7 +801,7 @@ void LoopUnswitch::UnswitchNontrivialCondition(Value *LIC, Constant *Val,
 
   // First step, split the preheader and exit blocks, and add these blocks to
   // the LoopBlocks list.
-  BasicBlock *NewPreheader = SplitEdge(loopPreheader, loopHeader, this);
+  BasicBlock *NewPreheader = SplitEdge(loopPreheader, loopHeader, DT, LI);
   LoopBlocks.push_back(NewPreheader);
 
   // We want the loop to come after the preheader, but before the exit blocks.
@@ -1047,7 +1047,7 @@ void LoopUnswitch::RewriteLoopBodyWithConditionConstant(Loop *L, Value *LIC,
     // and hooked up so as to preserve the loop structure, because
     // trying to update it is complicated.  So instead we preserve the
     // loop structure and put the block on a dead code path.
-    SplitEdge(Switch, SISucc, this);
+    SplitEdge(Switch, SISucc, DT, LI);
     // Compute the successors instead of relying on the return value
     // of SplitEdge, since it may have split the switch successor
     // after PHI nodes.

lib/Transforms/Utils/BasicBlockUtils.cpp

@@ -231,22 +231,14 @@ void llvm::ReplaceInstWithInst(Instruction *From, Instruction *To) {
 
 /// SplitEdge -  Split the edge connecting specified block. Pass P must
 /// not be NULL.
-BasicBlock *llvm::SplitEdge(BasicBlock *BB, BasicBlock *Succ, Pass *P) {
+BasicBlock *llvm::SplitEdge(BasicBlock *BB, BasicBlock *Succ, DominatorTree *DT,
+                            LoopInfo *LI) {
   unsigned SuccNum = GetSuccessorNumber(BB, Succ);
 
-  auto *AA = P->getAnalysisIfAvailable<AliasAnalysis>();
-  auto *DTWP = P->getAnalysisIfAvailable<DominatorTreeWrapperPass>();
-  auto *DT = DTWP ? &DTWP->getDomTree() : nullptr;
-  auto *LIWP = P->getAnalysisIfAvailable<LoopInfoWrapperPass>();
-  auto *LI = LIWP ? &LIWP->getLoopInfo() : nullptr;
-  bool PreserveLCSSA = P->mustPreserveAnalysisID(LCSSAID);
-  auto Options = CriticalEdgeSplittingOptions(AA, DT, LI);
-  if (PreserveLCSSA)
-    Options.setPreserveLCSSA();
-
   // If this is a critical edge, let SplitCriticalEdge do it.
   TerminatorInst *LatchTerm = BB->getTerminator();
-  if (SplitCriticalEdge(LatchTerm, SuccNum, Options))
+  if (SplitCriticalEdge(LatchTerm, SuccNum, CriticalEdgeSplittingOptions(DT, LI)
+                                                .setPreserveLCSSA()))
     return LatchTerm->getSuccessor(SuccNum);
 
   // If the edge isn't critical, then BB has a single successor or Succ has a

lib/Transforms/Utils/LoopUnrollRuntime.cpp

@@ -323,7 +323,6 @@ bool llvm::UnrollRuntimeLoopProlog(Loop *L, unsigned Count, LoopInfo *LI,
     SE->forgetLoop(ParentLoop);
 
   // Grab analyses that we preserve.
-  auto *AA = LPM->getAnalysisIfAvailable<AliasAnalysis>();
   auto *DTWP = LPM->getAnalysisIfAvailable<DominatorTreeWrapperPass>();
   auto *DT = DTWP ? &DTWP->getDomTree() : nullptr;
 
@@ -332,7 +331,7 @@ bool llvm::UnrollRuntimeLoopProlog(Loop *L, unsigned Count, LoopInfo *LI,
   BasicBlock *Latch = L->getLoopLatch();
   // It helps to splits the original preheader twice, one for the end of the
   // prolog code and one for a new loop preheader
-  BasicBlock *PEnd = SplitEdge(PH, Header, LPM->getAsPass());
+  BasicBlock *PEnd = SplitEdge(PH, Header, DT, LI);
   BasicBlock *NewPH = SplitBlock(PEnd, PEnd->getTerminator(), DT, LI);
   BranchInst *PreHeaderBR = cast<BranchInst>(PH->getTerminator());
 
@@ -403,7 +402,7 @@ bool llvm::UnrollRuntimeLoopProlog(Loop *L, unsigned Count, LoopInfo *LI,
   // PHI functions.
   BasicBlock *LastLoopBB = cast<BasicBlock>(VMap[Latch]);
   ConnectProlog(L, TripCount, Count, LastLoopBB, PEnd, PH, NewPH, VMap,
-                AA, DT, LI, LPM->getAsPass());
+                /*AliasAnalysis*/ nullptr, DT, LI, LPM->getAsPass());
   NumRuntimeUnrolled++;
   return true;
 }