#include "llvm/Analysis/ScalarEvolutionNormalization.h"
#include "llvm/Support/IRBuilder.h"
#include "llvm/Support/TargetFolder.h"
+#include "llvm/Support/ValueHandle.h"
#include <set>
namespace llvm {
ScalarEvolution &SE;
std::map<std::pair<const SCEV *, Instruction *>, AssertingVH<Value> >
InsertedExpressions;
- std::set<Value*> InsertedValues;
+ std::set<AssertingVH<Value> > InsertedValues;
+ std::set<AssertingVH<Value> > InsertedPostIncValues;
+
+ /// RelevantLoops - A memoization of the "relevant" loop for a given SCEV.
+ DenseMap<const SCEV *, const Loop *> RelevantLoops;
/// PostIncLoops - Addrecs referring to any of the given loops are expanded
/// in post-inc mode. For example, expanding {1,+,1}<L> in post-inc mode
/// clear - Erase the contents of the InsertedExpressions map so that users
/// trying to expand the same expression into multiple BasicBlocks or
/// different places within the same BasicBlock can do so.
- void clear() { InsertedExpressions.clear(); }
+ void clear() {
+ InsertedExpressions.clear();
+ InsertedValues.clear();
+ InsertedPostIncValues.clear();
+ }
/// 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);
+ PHINode *getOrInsertCanonicalInductionVariable(const Loop *L,
+ const Type *Ty);
/// expandCodeFor - Insert code to directly compute the specified SCEV
/// expression into the program. The inserted code is inserted into the
/// clearPostInc - Disable all post-inc expansion.
void clearPostInc() {
PostIncLoops.clear();
+
+ // When we change the post-inc loop set, cached expansions may no
+ // longer be valid.
+ InsertedPostIncValues.clear();
}
/// disableCanonicalMode - Disable the behavior of expanding expressions in
/// of work to avoid inserting an obviously redundant operation.
Value *InsertBinop(Instruction::BinaryOps Opcode, Value *LHS, Value *RHS);
+ /// ReuseOrCreateCast - Arange for there to be a cast of V to Ty at IP,
+ /// reusing an existing cast if a suitable one exists, moving an existing
+ /// cast if a suitable one exists but isn't in the right place, or
+ /// or creating a new one.
+ Value *ReuseOrCreateCast(Value *V, const Type *Ty,
+ Instruction::CastOps Op,
+ BasicBlock::iterator IP);
+
/// InsertNoopCastOfTo - Insert a cast of V to the specified type,
/// which must be possible with a noop cast, doing what we can to
/// share the casts.
/// inserted by the code rewriter. If so, the client should not modify the
/// instruction.
bool isInsertedInstruction(Instruction *I) const {
- return InsertedValues.count(I);
+ return InsertedValues.count(I) || InsertedPostIncValues.count(I);
}
+ /// getRelevantLoop - Determine the most "relevant" loop for the given SCEV.
+ const Loop *getRelevantLoop(const SCEV *);
+
Value *visitConstant(const SCEVConstant *S) {
return S->getValue();
}