//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/Passes.h"
-#include "llvm/Constant.h"
-#include "llvm/Instructions.h"
-#include "llvm/Function.h"
-#include "llvm/Pass.h"
-#include "llvm/Type.h"
-#include "llvm/Analysis/ProfileInfo.h"
+#include "llvm/ADT/DepthFirstIterator.h"
+#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/CodeGen/MachineDominators.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
-#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineLoopInfo.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
-#include "llvm/Support/CFG.h"
+#include "llvm/IR/CFG.h"
+#include "llvm/IR/Constant.h"
+#include "llvm/IR/Dominators.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/Type.h"
+#include "llvm/Pass.h"
#include "llvm/Target/TargetInstrInfo.h"
-#include "llvm/ADT/DepthFirstIterator.h"
-#include "llvm/ADT/SmallPtrSet.h"
using namespace llvm;
namespace {
class UnreachableBlockElim : public FunctionPass {
- virtual bool runOnFunction(Function &F);
+ bool runOnFunction(Function &F) override;
public:
static char ID; // Pass identification, replacement for typeid
- UnreachableBlockElim() : FunctionPass(ID) {}
+ UnreachableBlockElim() : FunctionPass(ID) {
+ initializeUnreachableBlockElimPass(*PassRegistry::getPassRegistry());
+ }
- virtual void getAnalysisUsage(AnalysisUsage &AU) const {
- AU.addPreserved<ProfileInfo>();
+ void getAnalysisUsage(AnalysisUsage &AU) const override {
+ AU.addPreserved<DominatorTreeWrapperPass>();
}
};
}
char UnreachableBlockElim::ID = 0;
INITIALIZE_PASS(UnreachableBlockElim, "unreachableblockelim",
- "Remove unreachable blocks from the CFG", false, false);
+ "Remove unreachable blocks from the CFG", false, false)
FunctionPass *llvm::createUnreachableBlockEliminationPass() {
return new UnreachableBlockElim();
SmallPtrSet<BasicBlock*, 8> Reachable;
// Mark all reachable blocks.
- for (df_ext_iterator<Function*, SmallPtrSet<BasicBlock*, 8> > I =
- df_ext_begin(&F, Reachable), E = df_ext_end(&F, Reachable); I != E; ++I)
- /* Mark all reachable blocks */;
+ for (BasicBlock *BB : depth_first_ext(&F, Reachable))
+ (void)BB/* Mark all reachable blocks */;
// Loop over all dead blocks, remembering them and deleting all instructions
// in them.
}
// Actually remove the blocks now.
- ProfileInfo *PI = getAnalysisIfAvailable<ProfileInfo>();
for (unsigned i = 0, e = DeadBlocks.size(); i != e; ++i) {
- if (PI) PI->removeBlock(DeadBlocks[i]);
DeadBlocks[i]->eraseFromParent();
}
- return DeadBlocks.size();
+ return !DeadBlocks.empty();
}
namespace {
class UnreachableMachineBlockElim : public MachineFunctionPass {
- virtual bool runOnMachineFunction(MachineFunction &F);
- virtual void getAnalysisUsage(AnalysisUsage &AU) const;
+ bool runOnMachineFunction(MachineFunction &F) override;
+ void getAnalysisUsage(AnalysisUsage &AU) const override;
MachineModuleInfo *MMI;
public:
static char ID; // Pass identification, replacement for typeid
char UnreachableMachineBlockElim::ID = 0;
INITIALIZE_PASS(UnreachableMachineBlockElim, "unreachable-mbb-elimination",
- "Remove unreachable machine basic blocks", false, false);
+ "Remove unreachable machine basic blocks", false, false)
char &llvm::UnreachableMachineBlockElimID = UnreachableMachineBlockElim::ID;
bool UnreachableMachineBlockElim::runOnMachineFunction(MachineFunction &F) {
SmallPtrSet<MachineBasicBlock*, 8> Reachable;
+ bool ModifiedPHI = false;
MMI = getAnalysisIfAvailable<MachineModuleInfo>();
MachineDominatorTree *MDT = getAnalysisIfAvailable<MachineDominatorTree>();
MachineLoopInfo *MLI = getAnalysisIfAvailable<MachineLoopInfo>();
// Mark all reachable blocks.
- for (df_ext_iterator<MachineFunction*, SmallPtrSet<MachineBasicBlock*, 8> >
- I = df_ext_begin(&F, Reachable), E = df_ext_end(&F, Reachable);
- I != E; ++I)
- /* Mark all reachable blocks */;
+ for (MachineBasicBlock *BB : depth_first_ext(&F, Reachable))
+ (void)BB/* Mark all reachable blocks */;
// Loop over all dead blocks, remembering them and deleting all instructions
// in them.
if (!preds.count(phi->getOperand(i).getMBB())) {
phi->RemoveOperand(i);
phi->RemoveOperand(i-1);
+ ModifiedPHI = true;
}
if (phi->getNumOperands() == 3) {
MachineInstr* temp = phi;
++phi;
temp->eraseFromParent();
+ ModifiedPHI = true;
- if (Input != Output)
- F.getRegInfo().replaceRegWith(Output, Input);
+ if (Input != Output) {
+ MachineRegisterInfo &MRI = F.getRegInfo();
+ MRI.constrainRegClass(Input, MRI.getRegClass(Output));
+ MRI.replaceRegWith(Output, Input);
+ }
continue;
}
F.RenumberBlocks();
- return DeadBlocks.size();
+ return (!DeadBlocks.empty() || ModifiedPHI);
}