#define LLVM_ANALYSIS_SCALAREVOLUTION_EXPANDER_H
#include "llvm/Analysis/ScalarEvolutionExpressions.h"
+#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;
- /// PostIncLoop - When non-null, expanded addrecs referring to the given
- /// loop expanded in post-inc mode. For example, expanding {1,+,1}<L> in
- /// post-inc mode returns the add instruction that adds one to the phi
- /// for {0,+,1}<L>, as opposed to a new phi starting at 1. This is only
- /// supported in non-canonical mode.
- const Loop *PostIncLoop;
+ /// 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
+ /// returns the add instruction that adds one to the phi for {0,+,1}<L>,
+ /// as opposed to a new phi starting at 1. This is only supported in
+ /// non-canonical mode.
+ PostIncLoopSet PostIncLoops;
/// IVIncInsertPos - When this is non-null, addrecs expanded in the
/// loop it indicates should be inserted with increments at
public:
/// SCEVExpander - Construct a SCEVExpander in "canonical" mode.
explicit SCEVExpander(ScalarEvolution &se)
- : SE(se), PostIncLoop(0), IVIncInsertLoop(0), CanonicalMode(true),
+ : SE(se), IVIncInsertLoop(0), CanonicalMode(true),
Builder(se.getContext(), TargetFolder(se.TD)) {}
/// 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
/// specified block.
- Value *expandCodeFor(const SCEV *SH, const Type *Ty, Instruction *I) {
- BasicBlock::iterator IP = I;
- while (isInsertedInstruction(IP)) ++IP;
- Builder.SetInsertPoint(IP->getParent(), IP);
- return expandCodeFor(SH, Ty);
- }
+ Value *expandCodeFor(const SCEV *SH, const Type *Ty, Instruction *I);
/// setIVIncInsertPos - Set the current IV increment loop and position.
void setIVIncInsertPos(const Loop *L, Instruction *Pos) {
IVIncInsertPos = Pos;
}
- /// setPostInc - If L is non-null, enable post-inc expansion for addrecs
- /// referring to the given loop. If L is null, disable post-inc expansion
- /// completely. Post-inc expansion is only supported in non-canonical
+ /// setPostInc - Enable post-inc expansion for addrecs referring to the
+ /// given loops. Post-inc expansion is only supported in non-canonical
/// mode.
- void setPostInc(const Loop *L) {
+ void setPostInc(const PostIncLoopSet &L) {
assert(!CanonicalMode &&
"Post-inc expansion is not supported in CanonicalMode");
- PostIncLoop = L;
+ PostIncLoops = L;
+ }
+
+ /// 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
/// is useful for late optimization passes.
void disableCanonicalMode() { CanonicalMode = false; }
+ /// clearInsertPoint - Clear the current insertion point. This is useful
+ /// if the instruction that had been serving as the insertion point may
+ /// have been deleted.
+ void clearInsertPoint() {
+ Builder.ClearInsertionPoint();
+ }
+
private:
LLVMContext &getContext() const { return SE.getContext(); }
/// 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();
}
void rememberInstruction(Value *I);
+ void restoreInsertPoint(BasicBlock *BB, BasicBlock::iterator I);
+
Value *expandAddRecExprLiterally(const SCEVAddRecExpr *);
PHINode *getAddRecExprPHILiterally(const SCEVAddRecExpr *Normalized,
const Loop *L,
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