Change SCEVNAryExpr's operand array from a SmallVector to a plain

pointer and length, and allocate the arrays in ScalarEvolution's
BumpPtrAllocator, so that they get released when their owning
SCEV gets released. SCEVs are immutable, so they don't need to worry
about operand array resizing. This fixes a memory leak reported
in PR6637.

llvm-svn: 98755

1 files changed, 10 insertions, 18 deletions

diff --git a/llvm/lib/Analysis/ScalarEvolutionExpander.cpp b/llvm/lib/Analysis/ScalarEvolutionExpander.cpp
index 3c2cbfbe78e..5b3a39802aa 100644
--- a/llvm/lib/Analysis/ScalarEvolutionExpander.cpp
+++ b/llvm/lib/Analysis/ScalarEvolutionExpander.cpp
@@ -232,9 +232,7 @@ static bool FactorOutConstant(const SCEV *&S,
       const SCEVConstant *FC = cast<SCEVConstant>(Factor);
       if (const SCEVConstant *C = dyn_cast<SCEVConstant>(M->getOperand(0)))
         if (!C->getValue()->getValue().srem(FC->getValue()->getValue())) {
-          const SmallVectorImpl<const SCEV *> &MOperands = M->getOperands();
-          SmallVector<const SCEV *, 4> NewMulOps(MOperands.begin(),
-                                                 MOperands.end());
+          SmallVector<const SCEV *, 4> NewMulOps(M->op_begin(), M->op_end());
           NewMulOps[0] =
             SE.getConstant(C->getValue()->getValue().sdiv(
                                                    FC->getValue()->getValue()));
@@ -249,9 +247,7 @@ static bool FactorOutConstant(const SCEV *&S,
         const SCEV *Remainder = SE.getIntegerSCEV(0, SOp->getType());
         if (FactorOutConstant(SOp, Remainder, Factor, SE, TD) &&
             Remainder->isZero()) {
-          const SmallVectorImpl<const SCEV *> &MOperands = M->getOperands();
-          SmallVector<const SCEV *, 4> NewMulOps(MOperands.begin(),
-                                                 MOperands.end());
+          SmallVector<const SCEV *, 4> NewMulOps(M->op_begin(), M->op_end());
           NewMulOps[i] = SOp;
           S = SE.getMulExpr(NewMulOps);
           return true;
@@ -297,13 +293,11 @@ static void SimplifyAddOperands(SmallVectorImpl<const SCEV *> &Ops,
                     SE.getAddExpr(NoAddRecs);
   // If it returned an add, use the operands. Otherwise it simplified
   // the sum into a single value, so just use that.
+  Ops.clear();
   if (const SCEVAddExpr *Add = dyn_cast<SCEVAddExpr>(Sum))
-    Ops = Add->getOperands();
-  else {
-    Ops.clear();
-    if (!Sum->isZero())
-      Ops.push_back(Sum);
-  }
+    Ops.insert(Ops.end(), Add->op_begin(), Add->op_begin());
+  else if (!Sum->isZero())
+    Ops.push_back(Sum);
   // Then append the addrecs.
   Ops.insert(Ops.end(), AddRecs.begin(), AddRecs.end());
 }
@@ -1060,10 +1054,9 @@ Value *SCEVExpander::visitAddRecExpr(const SCEVAddRecExpr *S) {
   if (CanonicalIV &&
       SE.getTypeSizeInBits(CanonicalIV->getType()) >
       SE.getTypeSizeInBits(Ty)) {
-    const SmallVectorImpl<const SCEV *> &Ops = S->getOperands();
-    SmallVector<const SCEV *, 4> NewOps(Ops.size());
-    for (unsigned i = 0, e = Ops.size(); i != e; ++i)
-      NewOps[i] = SE.getAnyExtendExpr(Ops[i], CanonicalIV->getType());
+    SmallVector<const SCEV *, 4> NewOps(S->getNumOperands());
+    for (unsigned i = 0, e = S->getNumOperands(); i != e; ++i)
+      NewOps[i] = SE.getAnyExtendExpr(S->op_begin()[i], CanonicalIV->getType());
     Value *V = expand(SE.getAddRecExpr(NewOps, S->getLoop()));
     BasicBlock *SaveInsertBB = Builder.GetInsertBlock();
     BasicBlock::iterator SaveInsertPt = Builder.GetInsertPoint();
@@ -1078,8 +1071,7 @@ Value *SCEVExpander::visitAddRecExpr(const SCEVAddRecExpr *S) {
 
   // {X,+,F} --> X + {0,+,F}
   if (!S->getStart()->isZero()) {
-    const SmallVectorImpl<const SCEV *> &SOperands = S->getOperands();
-    SmallVector<const SCEV *, 4> NewOps(SOperands.begin(), SOperands.end());
+    SmallVector<const SCEV *, 4> NewOps(S->op_begin(), S->op_end());
     NewOps[0] = SE.getIntegerSCEV(0, Ty);
     const SCEV *Rest = SE.getAddRecExpr(NewOps, L);