Revert patches to add case-range support for PR1255.

The work on this project was left in an unfinished and inconsistent state.
Hopefully someone will eventually get a chance to implement this feature, but
in the meantime, it is better to put things back the way the were.  I have
left support in the bitcode reader to handle the case-range bitcode format,
so that we do not lose bitcode compatibility with the llvm 3.3 release.

This reverts the following commits: 155464, 156374, 156377, 156613, 156704,
156757, 156804 156808, 156985, 157046, 157112, 157183, 157315, 157384, 157575,
157576, 157586, 157612, 157810, 157814, 157815, 157880, 157881, 157882, 157884,
157887, 157901, 158979, 157987, 157989, 158986, 158997, 159076, 159101, 159100,
159200, 159201, 159207, 159527, 159532, 159540, 159583, 159618, 159658, 159659,
159660, 159661, 159703, 159704, 160076, 167356, 172025, 186736

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190328 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 0 insertions, 588 deletions

diff --git a/include/llvm/Support/IntegersSubsetMapping.h b/include/llvm/Support/IntegersSubsetMapping.h
deleted file mode 100644
index 641ce78c5d..0000000000
--- a/include/llvm/Support/IntegersSubsetMapping.h
+++ /dev/null
@@ -1,588 +0,0 @@
-//===- IntegersSubsetMapping.h - Mapping subset ==> Successor ---*- C++ -*-===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-/// @file
-/// IntegersSubsetMapping is mapping from A to B, where
-/// Items in A is subsets of integers,
-/// Items in B some pointers (Successors).
-/// If user which to add another subset for successor that is already
-/// exists in mapping, IntegersSubsetMapping merges existing subset with
-/// added one.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_SUPPORT_INTEGERSSUBSETMAPPING_H
-#define LLVM_SUPPORT_INTEGERSSUBSETMAPPING_H
-
-#include "llvm/Support/IntegersSubset.h"
-#include <list>
-#include <map>
-#include <vector>
-
-namespace llvm {
-
-template <class SuccessorClass,
-          class IntegersSubsetTy = IntegersSubset,
-          class IntTy = IntItem>
-class IntegersSubsetMapping {
-  // FIXME: To much similar iterators typedefs, similar names. 
-  //        - Rename RangeIterator to the cluster iterator.
-  //        - Remove unused "add" methods.
-  //        - Class contents needs cleaning.
-public:
-  
-  typedef IntRange<IntTy> RangeTy;
-  
-  struct RangeEx : public RangeTy {
-    RangeEx() : Weight(1) {}
-    RangeEx(const RangeTy &R) : RangeTy(R), Weight(1) {}
-    RangeEx(const RangeTy &R, unsigned W) : RangeTy(R), Weight(W) {}
-    RangeEx(const IntTy &C) : RangeTy(C), Weight(1) {}
-    RangeEx(const IntTy &L, const IntTy &H) : RangeTy(L, H), Weight(1) {}
-    RangeEx(const IntTy &L, const IntTy &H, unsigned W) :
-      RangeTy(L, H), Weight(W) {}
-    unsigned Weight;
-  };
-
-  typedef std::pair<RangeEx, SuccessorClass*> Cluster;
-
-  typedef std::list<RangeTy> RangesCollection;
-  typedef typename RangesCollection::iterator RangesCollectionIt;
-  typedef typename RangesCollection::const_iterator RangesCollectionConstIt;
-  typedef IntegersSubsetMapping<SuccessorClass, IntegersSubsetTy, IntTy> self;
-  
-protected:
-
-  typedef std::list<Cluster> CaseItems;
-  typedef typename CaseItems::iterator CaseItemIt;
-  typedef typename CaseItems::const_iterator CaseItemConstIt;
-  
-  // TODO: Change unclean CRS prefixes to SubsetMap for example.
-  typedef std::map<SuccessorClass*, RangesCollection > CRSMap;
-  typedef typename CRSMap::iterator CRSMapIt;
-
-  struct ClustersCmp {
-    bool operator()(const Cluster &C1, const Cluster &C2) {
-      return C1.first < C2.first;
-    }
-  };
-  
-  CaseItems Items;
-  bool Sorted;
-  
-  bool isIntersected(CaseItemIt& LItem, CaseItemIt& RItem) {
-    return LItem->first.getHigh() >= RItem->first.getLow();
-  }
-
-  bool isJoinable(CaseItemIt& LItem, CaseItemIt& RItem) {
-    if (LItem->second != RItem->second) {
-      assert(!isIntersected(LItem, RItem) &&
-             "Intersected items with different successors!");
-      return false;
-    }
-    APInt RLow = RItem->first.getLow();
-    if (RLow != APInt::getNullValue(RLow.getBitWidth()))
-      --RLow;
-    return LItem->first.getHigh() >= RLow;
-  }
-  
-  void sort() {
-    if (!Sorted) {
-      std::vector<Cluster> clustersVector;
-      clustersVector.reserve(Items.size());
-      clustersVector.insert(clustersVector.begin(), Items.begin(), Items.end());
-      std::sort(clustersVector.begin(), clustersVector.end(), ClustersCmp());
-      Items.clear();
-      Items.insert(Items.begin(), clustersVector.begin(), clustersVector.end());
-      Sorted = true;
-    }
-  }
-  
-  enum DiffProcessState {
-    L_OPENED,
-    INTERSECT_OPENED,
-    R_OPENED,
-    ALL_IS_CLOSED
-  };
-  
-  class DiffStateMachine {
-    
-    DiffProcessState State;
-    IntTy OpenPt;
-    SuccessorClass *CurrentLSuccessor;
-    SuccessorClass *CurrentRSuccessor;
-    
-    self *LeftMapping;
-    self *IntersectionMapping;
-    self *RightMapping;
-
-  public:
-    
-    typedef
-      IntegersSubsetMapping<SuccessorClass, IntegersSubsetTy, IntTy> MappingTy;
-    
-    DiffStateMachine(MappingTy *L,
-                                 MappingTy *Intersection,
-                                 MappingTy *R) :
-                                 State(ALL_IS_CLOSED),
-                                 LeftMapping(L),
-                                 IntersectionMapping(Intersection),
-                                 RightMapping(R)
-                                 {}
-    
-    void onLOpen(const IntTy &Pt, SuccessorClass *S) {
-      switch (State) {
-      case R_OPENED:
-        if (Pt > OpenPt/*Don't add empty ranges.*/ && RightMapping) 
-          RightMapping->add(OpenPt, Pt-1, CurrentRSuccessor);
-        State = INTERSECT_OPENED;
-        break;
-      case ALL_IS_CLOSED:
-        State = L_OPENED;
-        break;
-      default:
-        assert(0 && "Got unexpected point.");
-        break;
-      }
-      CurrentLSuccessor = S;
-      OpenPt = Pt;
-    }
-    
-    void onLClose(const IntTy &Pt) {
-      switch (State) {
-      case L_OPENED:
-        assert(Pt >= OpenPt &&
-               "Subset is not sorted or contains overlapped ranges");
-        if (LeftMapping)
-          LeftMapping->add(OpenPt, Pt, CurrentLSuccessor);
-        State = ALL_IS_CLOSED;
-        break;
-      case INTERSECT_OPENED:
-        if (IntersectionMapping)
-          IntersectionMapping->add(OpenPt, Pt, CurrentLSuccessor);
-        OpenPt = Pt + 1;
-        State = R_OPENED;
-        break;
-      default:
-        assert(0 && "Got unexpected point.");
-        break;
-      }
-    }
-    
-    void onROpen(const IntTy &Pt, SuccessorClass *S) {
-      switch (State) {
-      case L_OPENED:
-        if (Pt > OpenPt && LeftMapping)
-          LeftMapping->add(OpenPt, Pt-1, CurrentLSuccessor);
-        State = INTERSECT_OPENED;
-        break;
-      case ALL_IS_CLOSED:
-        State = R_OPENED;
-        break;
-      default:
-        assert(0 && "Got unexpected point.");
-        break;
-      }
-      CurrentRSuccessor = S;
-      OpenPt = Pt;      
-    }
-    
-    void onRClose(const IntTy &Pt) {
-      switch (State) {
-      case R_OPENED:
-        assert(Pt >= OpenPt &&
-               "Subset is not sorted or contains overlapped ranges");
-        if (RightMapping)
-          RightMapping->add(OpenPt, Pt, CurrentRSuccessor);
-        State = ALL_IS_CLOSED;
-        break;
-      case INTERSECT_OPENED:
-        if (IntersectionMapping)
-          IntersectionMapping->add(OpenPt, Pt, CurrentLSuccessor);
-        OpenPt = Pt + 1;
-        State = L_OPENED;
-        break;
-      default:
-        assert(0 && "Got unexpected point.");
-        break;
-      }
-    }
-    
-    void onLROpen(const IntTy &Pt,
-                  SuccessorClass *LS,
-                  SuccessorClass *RS) {
-      switch (State) {
-      case ALL_IS_CLOSED:
-        State = INTERSECT_OPENED;
-        break;
-      default:
-        assert(0 && "Got unexpected point.");
-        break;
-      }
-      CurrentLSuccessor = LS;
-      CurrentRSuccessor = RS;
-      OpenPt = Pt;        
-    }
-    
-    void onLRClose(const IntTy &Pt) {
-      switch (State) {
-      case INTERSECT_OPENED:
-        if (IntersectionMapping)
-          IntersectionMapping->add(OpenPt, Pt, CurrentLSuccessor);
-        State = ALL_IS_CLOSED;
-        break;
-      default:
-        assert(0 && "Got unexpected point.");
-        break;        
-      }
-    }
-    
-    bool isLOpened() { return State == L_OPENED; }
-    bool isROpened() { return State == R_OPENED; }
-  };
-
-public:
-  
-  // Don't public CaseItems itself. Don't allow edit the Items directly. 
-  // Just present the user way to iterate over the internal collection
-  // sharing iterator, begin() and end(). Editing should be controlled by
-  // factory.
-  typedef CaseItemIt RangeIterator;
-  
-  typedef std::pair<SuccessorClass*, IntegersSubsetTy> Case;
-  typedef std::list<Case> Cases;
-  typedef typename Cases::iterator CasesIt;
-  
-  IntegersSubsetMapping() {
-    Sorted = false;
-  }
-  
-  bool verify() {
-    RangeIterator DummyErrItem;
-    return verify(DummyErrItem);
-  }
-  
-  bool verify(RangeIterator& errItem) {
-    if (Items.empty())
-      return true;
-    sort();
-    for (CaseItemIt j = Items.begin(), i = j++, e = Items.end();
-         j != e; i = j++) {
-      if (isIntersected(i, j) && i->second != j->second) {
-        errItem = j;
-        return false;
-      }
-    }
-    return true;
-  }
-
-  bool isOverlapped(self &RHS) {
-    if (Items.empty() || RHS.empty())
-      return true;
-    
-    for (CaseItemIt L = Items.begin(), R = RHS.Items.begin(),
-         el = Items.end(), er = RHS.Items.end(); L != el && R != er;) {
-      
-      const RangeTy &LRange = L->first;
-      const RangeTy &RRange = R->first;
-      
-      if (LRange.getLow() > RRange.getLow()) {
-        if (RRange.isSingleNumber() || LRange.getLow() > RRange.getHigh())
-          ++R;
-        else
-          return true;
-      } else if (LRange.getLow() < RRange.getLow()) {
-        if (LRange.isSingleNumber() || LRange.getHigh() < RRange.getLow())
-          ++L;
-        else
-          return true;
-      } else // iRange.getLow() == jRange.getLow() 
-        return true;
-    }
-    return false;
-  }
-   
-  
-  void optimize() {
-    if (Items.size() < 2)
-      return;
-    sort();
-    CaseItems OldItems = Items;
-    Items.clear();
-    const IntTy *Low = &OldItems.begin()->first.getLow();
-    const IntTy *High = &OldItems.begin()->first.getHigh();
-    unsigned Weight = OldItems.begin()->first.Weight;
-    SuccessorClass *Successor = OldItems.begin()->second;
-    for (CaseItemIt j = OldItems.begin(), i = j++, e = OldItems.end();
-         j != e; i = j++) {
-      if (isJoinable(i, j)) {
-        const IntTy *CurHigh = &j->first.getHigh();
-        Weight += j->first.Weight;
-        if (*CurHigh > *High)
-          High = CurHigh;
-      } else {
-        RangeEx R(*Low, *High, Weight);
-        add(R, Successor);
-        Low = &j->first.getLow();
-        High = &j->first.getHigh(); 
-        Weight = j->first.Weight;
-        Successor = j->second;
-      }
-    }
-    RangeEx R(*Low, *High, Weight);
-    add(R, Successor);
-    // We recollected the Items, but we kept it sorted.
-    Sorted = true;
-  }
-  
-  /// Adds a constant value.
-  void add(const IntTy &C, SuccessorClass *S = 0) {
-    RangeTy R(C);
-    add(R, S);
-  }
-  
-  /// Adds a range.
-  void add(const IntTy &Low, const IntTy &High, SuccessorClass *S = 0) {
-    RangeTy R(Low, High);
-    add(R, S);
-  }
-  void add(const RangeTy &R, SuccessorClass *S = 0) {
-    RangeEx REx = R;
-    add(REx, S);
-  }   
-  void add(const RangeEx &R, SuccessorClass *S = 0) {
-    Items.push_back(std::make_pair(R, S));
-    Sorted = false;
-  }  
-  
-  /// Adds all ranges and values from given ranges set to the current
-  /// mapping.
-  void add(const IntegersSubsetTy &CRS, SuccessorClass *S = 0,
-           unsigned Weight = 0) {
-    unsigned ItemWeight = 1;
-    if (Weight)
-      // Weight is associated with CRS, for now we perform a division to
-      // get the weight for each item.
-      ItemWeight = Weight / CRS.getNumItems();
-    for (unsigned i = 0, e = CRS.getNumItems(); i < e; ++i) {
-      RangeTy R = CRS.getItem(i);
-      RangeEx REx(R, ItemWeight);
-      add(REx, S);
-    }
-  }
-  
-  void add(self& RHS) {
-    Items.insert(Items.end(), RHS.Items.begin(), RHS.Items.end());
-  }
-  
-  void add(self& RHS, SuccessorClass *S) {
-    for (CaseItemIt i = RHS.Items.begin(), e = RHS.Items.end(); i != e; ++i)
-      add(i->first, S);
-  }  
-  
-  void add(const RangesCollection& RHS, SuccessorClass *S = 0) {
-    for (RangesCollectionConstIt i = RHS.begin(), e = RHS.end(); i != e; ++i)
-      add(*i, S);
-  }  
-  
-  /// Removes items from set.
-  void removeItem(RangeIterator i) { Items.erase(i); }
-  
-  /// Moves whole case from current mapping to the NewMapping object.
-  void detachCase(self& NewMapping, SuccessorClass *Succ) {
-    for (CaseItemIt i = Items.begin(); i != Items.end();)
-      if (i->second == Succ) {
-        NewMapping.add(i->first, i->second);
-        Items.erase(i++);
-      } else
-        ++i;
-  }
-  
-  /// Removes all clusters for given successor.
-  void removeCase(SuccessorClass *Succ) {
-    for (CaseItemIt i = Items.begin(); i != Items.end();)
-      if (i->second == Succ) {
-        Items.erase(i++);
-      } else
-        ++i;
-  }  
-  
-  /// Find successor that satisfies given value.
-  SuccessorClass *findSuccessor(const IntTy& Val) {
-    for (CaseItemIt i = Items.begin(); i != Items.end(); ++i) {
-      if (i->first.isInRange(Val))
-        return i->second;
-    }
-    return 0;
-  }  
-  
-  /// Calculates the difference between this mapping and RHS.
-  /// THIS without RHS is placed into LExclude,
-  /// RHS without THIS is placed into RExclude,
-  /// THIS intersect RHS is placed into Intersection.
-  void diff(self *LExclude, self *Intersection, self *RExclude,
-                             const self& RHS) {
-    
-    DiffStateMachine Machine(LExclude, Intersection, RExclude);
-    
-    CaseItemConstIt L = Items.begin(), R = RHS.Items.begin();
-    while (L != Items.end() && R != RHS.Items.end()) {
-      const Cluster &LCluster = *L;
-      const RangeEx &LRange = LCluster.first;
-      const Cluster &RCluster = *R;
-      const RangeEx &RRange = RCluster.first;
-      
-      if (LRange.getHigh() < RRange.getLow()) {
-        Machine.onLOpen(LRange.getLow(), LCluster.second);
-        Machine.onLClose(LRange.getHigh());
-        ++L;
-        continue;
-      }
-      
-      if (LRange.getLow() > RRange.getHigh()) {
-        Machine.onROpen(RRange.getLow(), RCluster.second);
-        Machine.onRClose(RRange.getHigh());
-        ++R;
-        continue;
-      }
-
-      if (LRange.getLow() < RRange.getLow()) {
-        // May be opened in previous iteration.
-        if (!Machine.isLOpened())
-          Machine.onLOpen(LRange.getLow(), LCluster.second);
-        Machine.onROpen(RRange.getLow(), RCluster.second);
-      }
-      else if (RRange.getLow() < LRange.getLow()) {
-        if (!Machine.isROpened())
-          Machine.onROpen(RRange.getLow(), RCluster.second);
-        Machine.onLOpen(LRange.getLow(), LCluster.second);
-      }
-      else
-        Machine.onLROpen(LRange.getLow(), LCluster.second, RCluster.second);
-      
-      if (LRange.getHigh() < RRange.getHigh()) {
-        Machine.onLClose(LRange.getHigh());
-        ++L;
-        while(L != Items.end() && L->first.getHigh() < RRange.getHigh()) {
-          Machine.onLOpen(L->first.getLow(), L->second);
-          Machine.onLClose(L->first.getHigh());
-          ++L;
-        }
-      }
-      else if (RRange.getHigh() < LRange.getHigh()) {
-        Machine.onRClose(RRange.getHigh());
-        ++R;
-        while(R != RHS.Items.end() && R->first.getHigh() < LRange.getHigh()) {
-          Machine.onROpen(R->first.getLow(), R->second);
-          Machine.onRClose(R->first.getHigh());
-          ++R;
-        }
-      }
-      else {
-        Machine.onLRClose(LRange.getHigh());
-        ++L;
-        ++R;
-      }
-    }
-    
-    if (L != Items.end()) {
-      if (Machine.isLOpened()) {
-        Machine.onLClose(L->first.getHigh());
-        ++L;
-      }
-      if (LExclude)
-        while (L != Items.end()) {
-          LExclude->add(L->first, L->second);
-          ++L;
-        }
-    } else if (R != RHS.Items.end()) {
-      if (Machine.isROpened()) {
-        Machine.onRClose(R->first.getHigh());
-        ++R;
-      }
-      if (RExclude)
-        while (R != RHS.Items.end()) {
-          RExclude->add(R->first, R->second);
-          ++R;
-        }
-    }
-  }  
-  
-  /// Builds the finalized case objects.
-  void getCases(Cases& TheCases, bool PreventMerging = false) {
-    //FIXME: PreventMerging is a temporary parameter.
-    //Currently a set of passes is still knows nothing about
-    //switches with case ranges, and if these passes meet switch
-    //with complex case that crashs the application.
-    if (PreventMerging) {
-      for (RangeIterator i = this->begin(); i != this->end(); ++i) {
-        RangesCollection SingleRange;
-        SingleRange.push_back(i->first);
-        TheCases.push_back(std::make_pair(i->second,
-                                          IntegersSubsetTy(SingleRange)));
-      }
-      return;
-    }
-    CRSMap TheCRSMap;
-    for (RangeIterator i = this->begin(); i != this->end(); ++i)
-      TheCRSMap[i->second].push_back(i->first);
-    for (CRSMapIt i = TheCRSMap.begin(), e = TheCRSMap.end(); i != e; ++i)
-      TheCases.push_back(std::make_pair(i->first, IntegersSubsetTy(i->second)));
-  }
-  
-  /// Builds the finalized case objects ignoring successor values, as though
-  /// all ranges belongs to the same successor.
-  IntegersSubsetTy getCase() {
-    RangesCollection Ranges;
-    for (RangeIterator i = this->begin(); i != this->end(); ++i)
-      Ranges.push_back(i->first);
-    return IntegersSubsetTy(Ranges);
-  }  
-  
-  /// Returns pointer to value of case if it is single-numbered or 0
-  /// in another case.
-  const IntTy* getCaseSingleNumber(SuccessorClass *Succ) {
-    const IntTy* Res = 0;
-    for (CaseItemIt i = Items.begin(); i != Items.end(); ++i)
-      if (i->second == Succ) {
-        if (!i->first.isSingleNumber())
-          return 0;
-        if (Res)
-          return 0;
-        else 
-          Res = &(i->first.getLow());
-      }
-    return Res;
-  }  
-  
-  /// Returns true if there is no ranges and values inside.
-  bool empty() const { return Items.empty(); }
-  
-  void clear() {
-    Items.clear();
-    // Don't reset Sorted flag:
-    // 1. For empty mapping it matters nothing.
-    // 2. After first item will added Sorted flag will cleared.
-  }  
-  
-  // Returns number of clusters
-  unsigned size() const {
-    return Items.size();
-  }
-  
-  RangeIterator begin() { return Items.begin(); }
-  RangeIterator end() { return Items.end(); }
-};
-
-class BasicBlock;
-typedef IntegersSubsetMapping<BasicBlock> IntegersSubsetToBB;
-
-}
-
-#endif /* LLVM_SUPPORT_INTEGERSSUBSETMAPPING_CRSBUILDER_H */