//
//===----------------------------------------------------------------------===//
-#define DEBUG_TYPE "early-cse"
#include "llvm/Transforms/Scalar.h"
-#include "llvm/Instructions.h"
-#include "llvm/Pass.h"
-#include "llvm/Analysis/Dominators.h"
-#include "llvm/Analysis/InstructionSimplify.h"
-#include "llvm/DataLayout.h"
-#include "llvm/Target/TargetLibraryInfo.h"
-#include "llvm/Transforms/Utils/Local.h"
-#include "llvm/Support/Debug.h"
-#include "llvm/Support/RecyclingAllocator.h"
#include "llvm/ADT/Hashing.h"
#include "llvm/ADT/ScopedHashTable.h"
#include "llvm/ADT/Statistic.h"
-#include <deque>
+#include "llvm/Analysis/InstructionSimplify.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/Dominators.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/Pass.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/RecyclingAllocator.h"
+#include "llvm/Target/TargetLibraryInfo.h"
+#include "llvm/Transforms/Utils/Local.h"
+#include <vector>
using namespace llvm;
+#define DEBUG_TYPE "early-cse"
+
STATISTIC(NumSimplify, "Number of instructions simplified or DCE'd");
STATISTIC(NumCSE, "Number of instructions CSE'd");
STATISTIC(NumCSELoad, "Number of load instructions CSE'd");
}
namespace llvm {
-// SimpleValue is POD.
-template<> struct isPodLike<SimpleValue> {
- static const bool value = true;
-};
-
template<> struct DenseMapInfo<SimpleValue> {
static inline SimpleValue getEmptyKey() {
return DenseMapInfo<Instruction*>::getEmptyKey();
return false;
CallInst *CI = dyn_cast<CallInst>(Inst);
- if (CI == 0 || !CI->onlyReadsMemory())
+ if (!CI || !CI->onlyReadsMemory())
return false;
return true;
}
}
namespace llvm {
- // CallValue is POD.
- template<> struct isPodLike<CallValue> {
- static const bool value = true;
- };
-
template<> struct DenseMapInfo<CallValue> {
static inline CallValue getEmptyKey() {
return DenseMapInfo<Instruction*>::getEmptyKey();
/// cases.
class EarlyCSE : public FunctionPass {
public:
- const DataLayout *TD;
+ const DataLayout *DL;
const TargetLibraryInfo *TLI;
DominatorTree *DT;
typedef RecyclingAllocator<BumpPtrAllocator,
initializeEarlyCSEPass(*PassRegistry::getPassRegistry());
}
- bool runOnFunction(Function &F);
+ bool runOnFunction(Function &F) override;
private:
bool processNode(DomTreeNode *Node);
// This transformation requires dominator postdominator info
- virtual void getAnalysisUsage(AnalysisUsage &AU) const {
- AU.addRequired<DominatorTree>();
+ void getAnalysisUsage(AnalysisUsage &AU) const override {
+ AU.addRequired<DominatorTreeWrapperPass>();
AU.addRequired<TargetLibraryInfo>();
AU.setPreservesCFG();
}
}
INITIALIZE_PASS_BEGIN(EarlyCSE, "early-cse", "Early CSE", false, false)
-INITIALIZE_PASS_DEPENDENCY(DominatorTree)
+INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfo)
INITIALIZE_PASS_END(EarlyCSE, "early-cse", "Early CSE", false, false)
// have invalidated the live-out memory values of our parent value. For now,
// just be conservative and invalidate memory if this block has multiple
// predecessors.
- if (BB->getSinglePredecessor() == 0)
+ if (!BB->getSinglePredecessor())
++CurrentGeneration;
/// LastStore - Keep track of the last non-volatile store that we saw... for
/// as long as there in no instruction that reads memory. If we see a store
/// to the same location, we delete the dead store. This zaps trivial dead
/// stores which can occur in bitfield code among other things.
- StoreInst *LastStore = 0;
+ StoreInst *LastStore = nullptr;
bool Changed = false;
// If the instruction can be simplified (e.g. X+0 = X) then replace it with
// its simpler value.
- if (Value *V = SimplifyInstruction(Inst, TD, TLI, DT)) {
+ if (Value *V = SimplifyInstruction(Inst, DL, TLI, DT)) {
DEBUG(dbgs() << "EarlyCSE Simplify: " << *Inst << " to: " << *V << '\n');
Inst->replaceAllUsesWith(V);
Inst->eraseFromParent();
if (LoadInst *LI = dyn_cast<LoadInst>(Inst)) {
// Ignore volatile loads.
if (!LI->isSimple()) {
- LastStore = 0;
+ LastStore = nullptr;
continue;
}
// generation, replace this instruction.
std::pair<Value*, unsigned> InVal =
AvailableLoads->lookup(Inst->getOperand(0));
- if (InVal.first != 0 && InVal.second == CurrentGeneration) {
+ if (InVal.first != nullptr && InVal.second == CurrentGeneration) {
DEBUG(dbgs() << "EarlyCSE CSE LOAD: " << *Inst << " to: "
<< *InVal.first << '\n');
if (!Inst->use_empty()) Inst->replaceAllUsesWith(InVal.first);
// Otherwise, remember that we have this instruction.
AvailableLoads->insert(Inst->getOperand(0),
std::pair<Value*, unsigned>(Inst, CurrentGeneration));
- LastStore = 0;
+ LastStore = nullptr;
continue;
}
// If this instruction may read from memory, forget LastStore.
if (Inst->mayReadFromMemory())
- LastStore = 0;
+ LastStore = nullptr;
// If this is a read-only call, process it.
if (CallValue::canHandle(Inst)) {
// If we have an available version of this call, and if it is the right
// generation, replace this instruction.
std::pair<Value*, unsigned> InVal = AvailableCalls->lookup(Inst);
- if (InVal.first != 0 && InVal.second == CurrentGeneration) {
+ if (InVal.first != nullptr && InVal.second == CurrentGeneration) {
DEBUG(dbgs() << "EarlyCSE CSE CALL: " << *Inst << " to: "
<< *InVal.first << '\n');
if (!Inst->use_empty()) Inst->replaceAllUsesWith(InVal.first);
LastStore->eraseFromParent();
Changed = true;
++NumDSE;
- LastStore = 0;
+ LastStore = nullptr;
continue;
}
bool EarlyCSE::runOnFunction(Function &F) {
- std::deque<StackNode *> nodesToProcess;
+ if (skipOptnoneFunction(F))
+ return false;
+
+ std::vector<StackNode *> nodesToProcess;
- TD = getAnalysisIfAvailable<DataLayout>();
+ DataLayoutPass *DLP = getAnalysisIfAvailable<DataLayoutPass>();
+ DL = DLP ? &DLP->getDataLayout() : nullptr;
TLI = &getAnalysis<TargetLibraryInfo>();
- DT = &getAnalysis<DominatorTree>();
+ DT = &getAnalysis<DominatorTreeWrapperPass>().getDomTree();
// Tables that the pass uses when walking the domtree.
ScopedHTType AVTable;
bool Changed = false;
// Process the root node.
- nodesToProcess.push_front(
+ nodesToProcess.push_back(
new StackNode(AvailableValues, AvailableLoads, AvailableCalls,
CurrentGeneration, DT->getRootNode(),
DT->getRootNode()->begin(),
while (!nodesToProcess.empty()) {
// Grab the first item off the stack. Set the current generation, remove
// the node from the stack, and process it.
- StackNode *NodeToProcess = nodesToProcess.front();
+ StackNode *NodeToProcess = nodesToProcess.back();
// Initialize class members.
CurrentGeneration = NodeToProcess->currentGeneration();
} else if (NodeToProcess->childIter() != NodeToProcess->end()) {
// Push the next child onto the stack.
DomTreeNode *child = NodeToProcess->nextChild();
- nodesToProcess.push_front(
+ nodesToProcess.push_back(
new StackNode(AvailableValues,
AvailableLoads,
AvailableCalls,
// It has been processed, and there are no more children to process,
// so delete it and pop it off the stack.
delete NodeToProcess;
- nodesToProcess.pop_front();
+ nodesToProcess.pop_back();
}
} // while (!nodes...)
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