[cleanup] Move the Dominators.h and Verifier.h headers into the IR

[oota-llvm.git] / lib / CodeGen / UnreachableBlockElim.cpp

diff --git a/lib/CodeGen/UnreachableBlockElim.cpp b/lib/CodeGen/UnreachableBlockElim.cpp
index 6ab5db2edaacb9e52006cbdd876df549e0b6e9f9..f2b1176e0ec1707811a2a279918d794e6c658741 100644 (file)
--- a/lib/CodeGen/UnreachableBlockElim.cpp
+++ b/lib/CodeGen/UnreachableBlockElim.cpp
@@ -21,21 +21,21 @@
 //===----------------------------------------------------------------------===//
 
 #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/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/Support/CFG.h"
 #include "llvm/Target/TargetInstrInfo.h"
-#include "llvm/ADT/DepthFirstIterator.h"
-#include "llvm/ADT/SmallPtrSet.h"
 using namespace llvm;
 
 namespace {
@@ -43,16 +43,18 @@ namespace {
     virtual bool runOnFunction(Function &F);
   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>();
+      AU.addPreserved<DominatorTree>();
     }
   };
 }
 char UnreachableBlockElim::ID = 0;
-static RegisterPass<UnreachableBlockElim>
-X("unreachableblockelim", "Remove unreachable blocks from the CFG");
+INITIALIZE_PASS(UnreachableBlockElim, "unreachableblockelim",
+                "Remove unreachable blocks from the CFG", false, false)
 
 FunctionPass *llvm::createUnreachableBlockEliminationPass() {
   return new UnreachableBlockElim();
@@ -83,9 +85,7 @@ bool UnreachableBlockElim::runOnFunction(Function &F) {
     }
 
   // 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();
   }
 
@@ -100,16 +100,15 @@ namespace {
     MachineModuleInfo *MMI;
   public:
     static char ID; // Pass identification, replacement for typeid
-    UnreachableMachineBlockElim() : MachineFunctionPass(&ID) {}
+    UnreachableMachineBlockElim() : MachineFunctionPass(ID) {}
   };
 }
 char UnreachableMachineBlockElim::ID = 0;
 
-static RegisterPass<UnreachableMachineBlockElim>
-Y("unreachable-mbb-elimination",
-  "Remove unreachable machine basic blocks");
+INITIALIZE_PASS(UnreachableMachineBlockElim, "unreachable-mbb-elimination",
+  "Remove unreachable machine basic blocks", false, false)
 
-const PassInfo *const llvm::UnreachableMachineBlockElimID = &Y;
+char &llvm::UnreachableMachineBlockElimID = UnreachableMachineBlockElim::ID;
 
 void UnreachableMachineBlockElim::getAnalysisUsage(AnalysisUsage &AU) const {
   AU.addPreserved<MachineLoopInfo>();
@@ -119,6 +118,7 @@ void UnreachableMachineBlockElim::getAnalysisUsage(AnalysisUsage &AU) const {
 
 bool UnreachableMachineBlockElim::runOnMachineFunction(MachineFunction &F) {
   SmallPtrSet<MachineBasicBlock*, 8> Reachable;
+  bool ModifiedPHI = false;
 
   MMI = getAnalysisIfAvailable<MachineModuleInfo>();
   MachineDominatorTree *MDT = getAnalysisIfAvailable<MachineDominatorTree>();
@@ -148,8 +148,7 @@ bool UnreachableMachineBlockElim::runOnMachineFunction(MachineFunction &F) {
         MachineBasicBlock* succ = *BB->succ_begin();
 
         MachineBasicBlock::iterator start = succ->begin();
-        while (start != succ->end() &&
-               start->getOpcode() == TargetInstrInfo::PHI) {
+        while (start != succ->end() && start->isPHI()) {
           for (unsigned i = start->getNumOperands() - 1; i >= 2; i-=2)
             if (start->getOperand(i).isMBB() &&
                 start->getOperand(i).getMBB() == BB) {
@@ -166,20 +165,8 @@ bool UnreachableMachineBlockElim::runOnMachineFunction(MachineFunction &F) {
   }
 
   // Actually remove the blocks now.
-  for (unsigned i = 0, e = DeadBlocks.size(); i != e; ++i) {
-    MachineBasicBlock *MBB = DeadBlocks[i];
-    // If there are any labels in the basic block, unregister them from
-    // MachineModuleInfo.
-    if (MMI && !MBB->empty()) {
-      for (MachineBasicBlock::iterator I = MBB->begin(),
-             E = MBB->end(); I != E; ++I) {
-        if (I->isLabel())
-          // The label ID # is always operand #0, an immediate.
-          MMI->InvalidateLabel(I->getOperand(0).getImm());
-      }
-    }
-    MBB->eraseFromParent();
-  }
+  for (unsigned i = 0, e = DeadBlocks.size(); i != e; ++i)
+    DeadBlocks[i]->eraseFromParent();
 
   // Cleanup PHI nodes.
   for (MachineFunction::iterator I = F.begin(), E = F.end(); I != E; ++I) {
@@ -188,12 +175,12 @@ bool UnreachableMachineBlockElim::runOnMachineFunction(MachineFunction &F) {
     SmallPtrSet<MachineBasicBlock*, 8> preds(BB->pred_begin(),
                                              BB->pred_end());
     MachineBasicBlock::iterator phi = BB->begin();
-    while (phi != BB->end() &&
-           phi->getOpcode() == TargetInstrInfo::PHI) {
+    while (phi != BB->end() && phi->isPHI()) {
       for (unsigned i = phi->getNumOperands() - 1; i >= 2; i-=2)
         if (!preds.count(phi->getOperand(i).getMBB())) {
           phi->RemoveOperand(i);
           phi->RemoveOperand(i-1);
+          ModifiedPHI = true;
         }
 
       if (phi->getNumOperands() == 3) {
@@ -203,9 +190,13 @@ bool UnreachableMachineBlockElim::runOnMachineFunction(MachineFunction &F) {
         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;
       }
@@ -216,5 +207,5 @@ bool UnreachableMachineBlockElim::runOnMachineFunction(MachineFunction &F) {
 
   F.RenumberBlocks();
 
-  return DeadBlocks.size();
+  return (DeadBlocks.size() || ModifiedPHI);
 }