//
//===----------------------------------------------------------------------===//
-#define DEBUG_TYPE "dce"
#include "llvm/Transforms/Scalar.h"
-#include "llvm/Transforms/Utils/Local.h"
-#include "llvm/Instruction.h"
-#include "llvm/Pass.h"
-#include "llvm/Support/Compiler.h"
-#include "llvm/Support/InstIterator.h"
#include "llvm/ADT/Statistic.h"
-#include <set>
+#include "llvm/IR/InstIterator.h"
+#include "llvm/IR/Instruction.h"
+#include "llvm/Pass.h"
+#include "llvm/Analysis/TargetLibraryInfo.h"
+#include "llvm/Transforms/Utils/Local.h"
using namespace llvm;
+#define DEBUG_TYPE "dce"
+
STATISTIC(DIEEliminated, "Number of insts removed by DIE pass");
STATISTIC(DCEEliminated, "Number of insts removed");
//===--------------------------------------------------------------------===//
// DeadInstElimination pass implementation
//
- struct VISIBILITY_HIDDEN DeadInstElimination : public BasicBlockPass {
+ struct DeadInstElimination : public BasicBlockPass {
static char ID; // Pass identification, replacement for typeid
- DeadInstElimination() : BasicBlockPass(intptr_t(&ID)) {}
- virtual bool runOnBasicBlock(BasicBlock &BB) {
+ DeadInstElimination() : BasicBlockPass(ID) {
+ initializeDeadInstEliminationPass(*PassRegistry::getPassRegistry());
+ }
+ bool runOnBasicBlock(BasicBlock &BB) override {
+ if (skipOptnoneFunction(BB))
+ return false;
+ auto *TLIP = getAnalysisIfAvailable<TargetLibraryInfoWrapperPass>();
+ TargetLibraryInfo *TLI = TLIP ? &TLIP->getTLI() : nullptr;
bool Changed = false;
for (BasicBlock::iterator DI = BB.begin(); DI != BB.end(); ) {
Instruction *Inst = DI++;
- if (isInstructionTriviallyDead(Inst)) {
+ if (isInstructionTriviallyDead(Inst, TLI)) {
Inst->eraseFromParent();
Changed = true;
++DIEEliminated;
return Changed;
}
- virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.setPreservesCFG();
}
};
-}
+} // namespace
char DeadInstElimination::ID = 0;
-static RegisterPass<DeadInstElimination>
-X("die", "Dead Instruction Elimination");
+INITIALIZE_PASS(DeadInstElimination, "die",
+ "Dead Instruction Elimination", false, false)
Pass *llvm::createDeadInstEliminationPass() {
return new DeadInstElimination();
//
struct DCE : public FunctionPass {
static char ID; // Pass identification, replacement for typeid
- DCE() : FunctionPass(&ID) {}
+ DCE() : FunctionPass(ID) {
+ initializeDCEPass(*PassRegistry::getPassRegistry());
+ }
- virtual bool runOnFunction(Function &F);
+ bool runOnFunction(Function &F) override;
- virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.setPreservesCFG();
}
};
-}
+} // namespace
char DCE::ID = 0;
-static RegisterPass<DCE> Y("dce", "Dead Code Elimination");
+INITIALIZE_PASS(DCE, "dce", "Dead Code Elimination", false, false)
bool DCE::runOnFunction(Function &F) {
+ if (skipOptnoneFunction(F))
+ return false;
+
+ auto *TLIP = getAnalysisIfAvailable<TargetLibraryInfoWrapperPass>();
+ TargetLibraryInfo *TLI = TLIP ? &TLIP->getTLI() : nullptr;
+
// Start out with all of the instructions in the worklist...
std::vector<Instruction*> WorkList;
for (inst_iterator i = inst_begin(F), e = inst_end(F); i != e; ++i)
Instruction *I = WorkList.back();
WorkList.pop_back();
- if (isInstructionTriviallyDead(I)) { // If the instruction is dead.
+ if (isInstructionTriviallyDead(I, TLI)) { // If the instruction is dead.
// Loop over all of the values that the instruction uses, if there are
// instructions being used, add them to the worklist, because they might
// go dead after this one is removed.
I->eraseFromParent();
// Remove the instruction from the worklist if it still exists in it.
- for (std::vector<Instruction*>::iterator WI = WorkList.begin();
- WI != WorkList.end(); ) {
- if (*WI == I)
- WI = WorkList.erase(WI);
- else
- ++WI;
- }
+ WorkList.erase(std::remove(WorkList.begin(), WorkList.end(), I),
+ WorkList.end());
MadeChange = true;
++DCEEliminated;