Template-ize more of the DomTree internal implementation details. Only the calculate...

[oota-llvm.git] / include / llvm / Analysis / ScalarEvolutionExpander.h

diff --git a/include/llvm/Analysis/ScalarEvolutionExpander.h b/include/llvm/Analysis/ScalarEvolutionExpander.h
index 80e0a9d8cf1d9b77629100ccd25611ce9ef9ec8a..8866de54dfd06efe3aac88d233fc5f1292b7c3e2 100644 (file)
--- a/include/llvm/Analysis/ScalarEvolutionExpander.h
+++ b/include/llvm/Analysis/ScalarEvolutionExpander.h
@@ -60,8 +60,7 @@ namespace llvm {
     /// loop (inserting one if there is none).  A canonical induction variable
     /// starts at zero and steps by one on each iteration.
     Value *getOrInsertCanonicalInductionVariable(const Loop *L, const Type *Ty){
-      assert((Ty->isInteger() || Ty->isFloatingPoint()) &&
-             "Can only insert integer or floating point induction variables!");
+      assert(Ty->isInteger() && "Can only insert integer induction variables!");
       SCEVHandle H = SCEVAddRecExpr::get(SCEVUnknown::getIntegerSCEV(0, Ty),
                                          SCEVUnknown::getIntegerSCEV(1, Ty), L);
       return expand(H);
@@ -74,54 +73,28 @@ namespace llvm {
       InsertedInstructions.insert(I);
     }
 
+    Instruction *getInsertionPoint() const { return InsertPt; }
+    
     /// expandCodeFor - Insert code to directly compute the specified SCEV
     /// expression into the program.  The inserted code is inserted into the
     /// specified block.
-    ///
-    /// If a particular value sign is required, a type may be specified for the
-    /// result.
-    Value *expandCodeFor(SCEVHandle SH, Instruction *IP, const Type *Ty = 0) {
+    Value *expandCodeFor(SCEVHandle SH, Instruction *IP) {
       // Expand the code for this SCEV.
       this->InsertPt = IP;
-      return expandInTy(SH, Ty);
+      return expand(SH);
     }
 
     /// InsertCastOfTo - Insert a cast of V to the specified type, doing what
     /// we can to share the casts.
     static Value *InsertCastOfTo(Instruction::CastOps opcode, Value *V, 
                                  const Type *Ty);
-    
+    /// InsertBinop - Insert the specified binary operator, doing a small amount
+    /// of work to avoid inserting an obviously redundant operation.
+    static Value *InsertBinop(Instruction::BinaryOps Opcode, Value *LHS,
+                              Value *RHS, Instruction *&InsertPt);
   protected:
-    Value *expand(SCEV *S) {
-      // Check to see if we already expanded this.
-      std::map<SCEVHandle, Value*>::iterator I = InsertedExpressions.find(S);
-      if (I != InsertedExpressions.end())
-        return I->second;
-
-      Value *V = visit(S);
-      InsertedExpressions[S] = V;
-      return V;
-    }
-
-    Value *expandInTy(SCEV *S, const Type *Ty) {
-      Value *V = expand(S);
-      if (Ty && V->getType() != Ty) {
-        if (isa<PointerType>(Ty) && V->getType()->isInteger())
-          return InsertCastOfTo(Instruction::IntToPtr, V, Ty);
-        else if (Ty->isInteger() && isa<PointerType>(V->getType()))
-          return InsertCastOfTo(Instruction::PtrToInt, V, Ty);
-        else if (Ty->getPrimitiveSizeInBits() == 
-                 V->getType()->getPrimitiveSizeInBits())
-          return InsertCastOfTo(Instruction::BitCast, V, Ty);
-        else if (Ty->getPrimitiveSizeInBits() > 
-                 V->getType()->getPrimitiveSizeInBits())
-          return InsertCastOfTo(Instruction::ZExt, V, Ty);
-        else
-          return InsertCastOfTo(Instruction::Trunc, V, Ty);
-      }
-      return V;
-    }
-
+    Value *expand(SCEV *S);
+    
     Value *visitConstant(SCEVConstant *S) {
       return S->getValue();
     }
@@ -132,28 +105,31 @@ namespace llvm {
     }
 
     Value *visitZeroExtendExpr(SCEVZeroExtendExpr *S) {
-      Value *V = expandInTy(S->getOperand(), S->getType());
+      Value *V = expand(S->getOperand());
       return CastInst::createZExtOrBitCast(V, S->getType(), "tmp.", InsertPt);
     }
 
+    Value *visitSignExtendExpr(SCEVSignExtendExpr *S) {
+      Value *V = expand(S->getOperand());
+      return CastInst::createSExtOrBitCast(V, S->getType(), "tmp.", InsertPt);
+    }
+
     Value *visitAddExpr(SCEVAddExpr *S) {
-      const Type *Ty = S->getType();
-      Value *V = expandInTy(S->getOperand(S->getNumOperands()-1), Ty);
+      Value *V = expand(S->getOperand(S->getNumOperands()-1));
 
       // Emit a bunch of add instructions
       for (int i = S->getNumOperands()-2; i >= 0; --i)
-        V = BinaryOperator::createAdd(V, expandInTy(S->getOperand(i), Ty),
-                                      "tmp.", InsertPt);
+        V = InsertBinop(Instruction::Add, V, expand(S->getOperand(i)),
+                        InsertPt);
       return V;
     }
 
     Value *visitMulExpr(SCEVMulExpr *S);
 
     Value *visitSDivExpr(SCEVSDivExpr *S) {
-      const Type *Ty = S->getType();
-      Value *LHS = expandInTy(S->getLHS(), Ty);
-      Value *RHS = expandInTy(S->getRHS(), Ty);
-      return BinaryOperator::createSDiv(LHS, RHS, "tmp.", InsertPt);
+      Value *LHS = expand(S->getLHS());
+      Value *RHS = expand(S->getRHS());
+      return InsertBinop(Instruction::SDiv, LHS, RHS, InsertPt);
     }
 
     Value *visitAddRecExpr(SCEVAddRecExpr *S);