Add a properlyDominates member function to ScalarEvolution.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82898 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 22 insertions, 0 deletions

diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp
index fa45235..12ad429 100644
--- a/lib/Analysis/ScalarEvolution.cpp
+++ b/lib/Analysis/ScalarEvolution.cpp
@@ -207,6 +207,10 @@ bool SCEVCastExpr::dominates(BasicBlock *BB, DominatorTree *DT) const {
   return Op->dominates(BB, DT);
 }
 
+bool SCEVCastExpr::properlyDominates(BasicBlock *BB, DominatorTree *DT) const {
+  return Op->properlyDominates(BB, DT);
+}
+
 SCEVTruncateExpr::SCEVTruncateExpr(const FoldingSetNodeID &ID,
                                    const SCEV *op, const Type *ty)
   : SCEVCastExpr(ID, scTruncate, op, ty) {
@@ -260,10 +264,22 @@ bool SCEVNAryExpr::dominates(BasicBlock *BB, DominatorTree *DT) const {
   return true;
 }
 
+bool SCEVNAryExpr::properlyDominates(BasicBlock *BB, DominatorTree *DT) const {
+  for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
+    if (!getOperand(i)->properlyDominates(BB, DT))
+      return false;
+  }
+  return true;
+}
+
 bool SCEVUDivExpr::dominates(BasicBlock *BB, DominatorTree *DT) const {
   return LHS->dominates(BB, DT) && RHS->dominates(BB, DT);
 }
 
+bool SCEVUDivExpr::properlyDominates(BasicBlock *BB, DominatorTree *DT) const {
+  return LHS->properlyDominates(BB, DT) && RHS->properlyDominates(BB, DT);
+}
+
 void SCEVUDivExpr::print(raw_ostream &OS) const {
   OS << "(" << *LHS << " /u " << *RHS << ")";
 }
@@ -328,6 +344,12 @@ bool SCEVUnknown::dominates(BasicBlock *BB, DominatorTree *DT) const {
   return true;
 }
 
+bool SCEVUnknown::properlyDominates(BasicBlock *BB, DominatorTree *DT) const {
+  if (Instruction *I = dyn_cast<Instruction>(getValue()))
+    return DT->properlyDominates(I->getParent(), BB);
+  return true;
+}
+
 const Type *SCEVUnknown::getType() const {
   return V->getType();
 }