Extend ScalarEvolution's multiple-exit support to compute exact

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

diff --git a/include/llvm/Analysis/ScalarEvolutionExpander.h b/include/llvm/Analysis/ScalarEvolutionExpander.h
index 6290c4012344193582db262207c218f4b3297b7f..730c97fff4d7e4295b47979b0e4fafd31733beb3 100644 (file)
--- a/include/llvm/Analysis/ScalarEvolutionExpander.h
+++ b/include/llvm/Analysis/ScalarEvolutionExpander.h
@@ -28,18 +28,15 @@ namespace llvm {
   /// memory.
   struct SCEVExpander : public SCEVVisitor<SCEVExpander, Value*> {
     ScalarEvolution &SE;
-    LoopInfo &LI;
-    std::map<SCEVHandle, Value*> InsertedExpressions;
+    std::map<const SCEV*, AssertingVH<Value> > InsertedExpressions;
     std::set<Value*> InsertedValues;
 
     BasicBlock::iterator InsertPt;
 
     friend struct SCEVVisitor<SCEVExpander, Value*>;
   public:
-    SCEVExpander(ScalarEvolution &se, LoopInfo &li)
-      : SE(se), LI(li) {}
-
-    LoopInfo &getLoopInfo() const { return LI; }
+    explicit SCEVExpander(ScalarEvolution &se)
+      : SE(se) {}
 
     /// clear - Erase the contents of the InsertedExpressions map so that users
     /// trying to expand the same expression into multiple BasicBlocks or
@@ -53,16 +50,17 @@ namespace llvm {
       return InsertedValues.count(I);
     }
 
+    /// isInsertedExpression - Return true if the the code rewriter has a
+    /// Value* recorded for the given expression.
+    bool isInsertedExpression(const SCEV *S) const {
+      return InsertedExpressions.count(S);
+    }
+
     /// getOrInsertCanonicalInductionVariable - This method returns the
     /// canonical induction variable of the specified type for the specified
     /// 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() && "Can only insert integer induction variables!");
-      SCEVHandle H = SE.getAddRecExpr(SE.getIntegerSCEV(0, Ty),
-                                      SE.getIntegerSCEV(1, Ty), L);
-      return expand(H);
-    }
+    Value *getOrInsertCanonicalInductionVariable(const Loop *L, const Type *Ty);
 
     /// addInsertedValue - Remember the specified instruction as being the
     /// canonical form for the specified SCEV.
@@ -77,13 +75,14 @@ namespace llvm {
 
     /// expandCodeFor - Insert code to directly compute the specified SCEV
     /// expression into the program.  The inserted code is inserted into the
-    /// SCEVExpander's current insertion point.
-    Value *expandCodeFor(SCEVHandle SH, const Type *Ty);
+    /// SCEVExpander's current insertion point. If a type is specified, the
+    /// result will be expanded to have that type, with a cast if necessary.
+    Value *expandCodeFor(const SCEV* SH, const Type *Ty = 0);
 
     /// expandCodeFor - Insert code to directly compute the specified SCEV
     /// expression into the program.  The inserted code is inserted into the
     /// specified block.
-    Value *expandCodeFor(SCEVHandle SH, const Type *Ty,
+    Value *expandCodeFor(const SCEV* SH, const Type *Ty,
                          BasicBlock::iterator IP) {
       setInsertionPoint(IP);
       return expandCodeFor(SH, Ty);
@@ -100,10 +99,16 @@ namespace llvm {
 
     /// 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, BasicBlock::iterator InsertPt);
+    Value *InsertBinop(Instruction::BinaryOps Opcode, Value *LHS,
+                       Value *RHS, BasicBlock::iterator InsertPt);
 
   private:
+    /// expandAddToGEP - Expand a SCEVAddExpr with a pointer type into a GEP
+    /// instead of using ptrtoint+arithmetic+inttoptr.
+    Value *expandAddToGEP(const SCEV* const *op_begin,
+                          const SCEV* const *op_end,
+                          const PointerType *PTy, const Type *Ty, Value *V);
+
     Value *expand(const SCEV *S);
 
     Value *visitConstant(const SCEVConstant *S) {