Template-ize more of the DomTree internal implementation details. Only the calculate() methods for DomTree and PostDomTree remain to be merged/template-ized.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42476 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 7 insertions, 146 deletions

diff --git a/lib/Analysis/PostDominatorCalculation.h b/lib/Analysis/PostDominatorCalculation.h
index c02bb33..5aa692e 100644
--- a/lib/Analysis/PostDominatorCalculation.h
+++ b/lib/Analysis/PostDominatorCalculation.h
@@ -50,7 +50,8 @@ void PDTcalculate(PostDominatorTree& PDT, Function &F) {
     // Step #2: Calculate the semidominators of all vertices
     for (succ_iterator SI = succ_begin(W), SE = succ_end(W); SI != SE; ++SI)
       if (PDT.Info.count(*SI)) {  // Only if this predecessor is reachable!
-        unsigned SemiU = PDT.Info[Eval(PDT, *SI)].Semi;
+        unsigned SemiU =
+             PDT.Info[Eval<GraphTraits<Inverse<BasicBlock*> > >(PDT, *SI)].Semi;
         if (SemiU < WInfo.Semi)
           WInfo.Semi = SemiU;
       }
@@ -58,14 +59,14 @@ void PDTcalculate(PostDominatorTree& PDT, Function &F) {
     PDT.Info[PDT.Vertex[WInfo.Semi]].Bucket.push_back(W);
     
     BasicBlock *WParent = WInfo.Parent;
-    Link(PDT, WParent, W, WInfo);
+    Link<GraphTraits<Inverse<BasicBlock*> > >(PDT, WParent, W, WInfo);
     
     // Step #3: Implicitly define the immediate dominator of vertices
     std::vector<BasicBlock*> &WParentBucket = PDT.Info[WParent].Bucket;
     while (!WParentBucket.empty()) {
       BasicBlock *V = WParentBucket.back();
       WParentBucket.pop_back();
-      BasicBlock *U = Eval(PDT, V);
+      BasicBlock *U = Eval<GraphTraits<Inverse<BasicBlock*> > >(PDT, V);
       PDT.IDoms[V] = PDT.Info[U].Semi < PDT.Info[V].Semi ? U : WParent;
     }
   }
diff --git a/lib/VMCore/DominatorCalculation.h b/lib/VMCore/DominatorCalculation.h
index bf90a97..a9118d8 100644
--- a/lib/VMCore/DominatorCalculation.h
+++ b/lib/VMCore/DominatorCalculation.h
@@ -53,7 +53,7 @@ void DTcalculate(DominatorTree& DT, Function &F) {
     // Step #2: Calculate the semidominators of all vertices
     for (pred_iterator PI = pred_begin(W), E = pred_end(W); PI != E; ++PI)
       if (DT.Info.count(*PI)) {  // Only if this predecessor is reachable!
-        unsigned SemiU = DT.Info[Eval(DT, *PI)].Semi;
+        unsigned SemiU = DT.Info[Eval<GraphTraits<BasicBlock*> >(DT, *PI)].Semi;
         if (SemiU < WInfo.Semi)
           WInfo.Semi = SemiU;
       }
@@ -61,14 +61,14 @@ void DTcalculate(DominatorTree& DT, Function &F) {
     DT.Info[DT.Vertex[WInfo.Semi]].Bucket.push_back(W);
 
     BasicBlock *WParent = WInfo.Parent;
-    Link(DT, WParent, W, WInfo);
+    Link<GraphTraits<BasicBlock*> >(DT, WParent, W, WInfo);
 
     // Step #3: Implicitly define the immediate dominator of vertices
     std::vector<BasicBlock*> &WParentBucket = DT.Info[WParent].Bucket;
     while (!WParentBucket.empty()) {
       BasicBlock *V = WParentBucket.back();
       WParentBucket.pop_back();
-      BasicBlock *U = Eval(DT, V);
+      BasicBlock *U = Eval<GraphTraits<BasicBlock*> >(DT, V);
       DT.IDoms[V] = DT.Info[U].Semi < DT.Info[V].Semi ? U : WParent;
     }
   }
diff --git a/lib/VMCore/DominatorInternals.cpp b/lib/VMCore/DominatorInternals.cpp
deleted file mode 100644
index abb87cd..0000000
--- a/lib/VMCore/DominatorInternals.cpp
+++ /dev/null
@@ -1,140 +0,0 @@
-//==- DominatorInternals.cpp - Dominator Calculation -------------*- C++ -*-==//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file was developed by Owen Anderson and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Analysis/Dominators.h"
-#include "llvm/ADT/DenseMap.h"
-#include "llvm/ADT/SmallPtrSet.h"
-//===----------------------------------------------------------------------===//
-//
-// DominatorTree construction - This pass constructs immediate dominator
-// information for a flow-graph based on the algorithm described in this
-// document:
-//
-//   A Fast Algorithm for Finding Dominators in a Flowgraph
-//   T. Lengauer & R. Tarjan, ACM TOPLAS July 1979, pgs 121-141.
-//
-// This implements both the O(n*ack(n)) and the O(n*log(n)) versions of EVAL and
-// LINK, but it turns out that the theoretically slower O(n*log(n))
-// implementation is actually faster than the "efficient" algorithm (even for
-// large CFGs) because the constant overheads are substantially smaller.  The
-// lower-complexity version can be enabled with the following #define:
-//
-#define BALANCE_IDOM_TREE 0
-//
-//===----------------------------------------------------------------------===//
-
-namespace llvm {
-
-void Compress(DominatorTreeBase& DT, BasicBlock *VIn) {
-
-  std::vector<BasicBlock *> Work;
-  SmallPtrSet<BasicBlock *, 32> Visited;
-  BasicBlock *VInAncestor = DT.Info[VIn].Ancestor;
-  DominatorTreeBase::InfoRec &VInVAInfo = DT.Info[VInAncestor];
-
-  if (VInVAInfo.Ancestor != 0)
-    Work.push_back(VIn);
-  
-  while (!Work.empty()) {
-    BasicBlock *V = Work.back();
-    DominatorTree::InfoRec &VInfo = DT.Info[V];
-    BasicBlock *VAncestor = VInfo.Ancestor;
-    DominatorTreeBase::InfoRec &VAInfo = DT.Info[VAncestor];
-
-    // Process Ancestor first
-    if (Visited.insert(VAncestor) &&
-        VAInfo.Ancestor != 0) {
-      Work.push_back(VAncestor);
-      continue;
-    } 
-    Work.pop_back(); 
-
-    // Update VInfo based on Ancestor info
-    if (VAInfo.Ancestor == 0)
-      continue;
-    BasicBlock *VAncestorLabel = VAInfo.Label;
-    BasicBlock *VLabel = VInfo.Label;
-    if (DT.Info[VAncestorLabel].Semi < DT.Info[VLabel].Semi)
-      VInfo.Label = VAncestorLabel;
-    VInfo.Ancestor = VAInfo.Ancestor;
-  }
-}
-
-BasicBlock *Eval(DominatorTreeBase& DT, BasicBlock *V) {
-                 DominatorTreeBase::InfoRec &VInfo = DT.Info[V];
-#if !BALANCE_IDOM_TREE
-  // Higher-complexity but faster implementation
-  if (VInfo.Ancestor == 0)
-    return V;
-  Compress(DT, V);
-  return VInfo.Label;
-#else
-  // Lower-complexity but slower implementation
-  if (VInfo.Ancestor == 0)
-    return VInfo.Label;
-  Compress(DT, V);
-  BasicBlock *VLabel = VInfo.Label;
-
-  BasicBlock *VAncestorLabel = DT.Info[VInfo.Ancestor].Label;
-  if (DT.Info[VAncestorLabel].Semi >= DT.Info[VLabel].Semi)
-    return VLabel;
-  else
-    return VAncestorLabel;
-#endif
-}
-
-void Link(DominatorTreeBase& DT, BasicBlock *V, BasicBlock *W,
-          DominatorTreeBase::InfoRec &WInfo) {
-#if !BALANCE_IDOM_TREE
-  // Higher-complexity but faster implementation
-  WInfo.Ancestor = V;
-#else
-  // Lower-complexity but slower implementation
-  BasicBlock *WLabel = WInfo.Label;
-  unsigned WLabelSemi = DT.Info[WLabel].Semi;
-  BasicBlock *S = W;
-  InfoRec *SInfo = &DT.Info[S];
-
-  BasicBlock *SChild = SInfo->Child;
-  InfoRec *SChildInfo = &DT.Info[SChild];
-
-  while (WLabelSemi < DT.Info[SChildInfo->Label].Semi) {
-    BasicBlock *SChildChild = SChildInfo->Child;
-    if (SInfo->Size+DT.Info[SChildChild].Size >= 2*SChildInfo->Size) {
-      SChildInfo->Ancestor = S;
-      SInfo->Child = SChild = SChildChild;
-      SChildInfo = &DT.Info[SChild];
-    } else {
-      SChildInfo->Size = SInfo->Size;
-      S = SInfo->Ancestor = SChild;
-      SInfo = SChildInfo;
-      SChild = SChildChild;
-      SChildInfo = &DT.Info[SChild];
-    }
-  }
-
-  DominatorTreeBase::InfoRec &VInfo = DT.Info[V];
-  SInfo->Label = WLabel;
-
-  assert(V != W && "The optimization here will not work in this case!");
-  unsigned WSize = WInfo.Size;
-  unsigned VSize = (VInfo.Size += WSize);
-
-  if (VSize < 2*WSize)
-    std::swap(S, VInfo.Child);
-
-  while (S) {
-    SInfo = &DT.Info[S];
-    SInfo->Ancestor = V;
-    S = SInfo->Child;
-  }
-#endif
-}
-
-}