X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FTransforms%2FScalar%2FDCE.cpp;h=8dbcc23d7ec85677a75d2863323f85488f08bb41;hb=827454e6e28cfed93db990b03b720ef7c23e6917;hp=539dd22d47d102b54de8e61995a71e5125c91571;hpb=4ee451de366474b9c228b4e5fa573795a715216d;p=oota-llvm.git

diff --git a/lib/Transforms/Scalar/DCE.cpp b/lib/Transforms/Scalar/DCE.cpp
index 539dd22d47d..8dbcc23d7ec 100644
--- a/lib/Transforms/Scalar/DCE.cpp
+++ b/lib/Transforms/Scalar/DCE.cpp
@@ -21,10 +21,8 @@
 #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>
 using namespace llvm;
 
 STATISTIC(DIEEliminated, "Number of insts removed by DIE pass");
@@ -34,17 +32,21 @@ namespace {
   //===--------------------------------------------------------------------===//
   // 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)) {}
+    DeadInstElimination() : BasicBlockPass(ID) {
+      initializeDeadInstEliminationPass(*PassRegistry::getPassRegistry());
+    }
     virtual bool runOnBasicBlock(BasicBlock &BB) {
       bool Changed = false;
-      for (BasicBlock::iterator DI = BB.begin(); DI != BB.end(); )
-        if (dceInstruction(DI)) {
+      for (BasicBlock::iterator DI = BB.begin(); DI != BB.end(); ) {
+        Instruction *Inst = DI++;
+        if (isInstructionTriviallyDead(Inst)) {
+          Inst->eraseFromParent();
           Changed = true;
           ++DIEEliminated;
-        } else
-          ++DI;
+        }
+      }
       return Changed;
     }
 
@@ -52,11 +54,12 @@ namespace {
       AU.setPreservesCFG();
     }
   };
-
-  char DeadInstElimination::ID = 0;
-  RegisterPass<DeadInstElimination> X("die", "Dead Instruction Elimination");
 }
 
+char DeadInstElimination::ID = 0;
+INITIALIZE_PASS(DeadInstElimination, "die",
+                "Dead Instruction Elimination", false, false)
+
 Pass *llvm::createDeadInstEliminationPass() {
   return new DeadInstElimination();
 }
@@ -68,7 +71,9 @@ namespace {
   //
   struct DCE : public FunctionPass {
     static char ID; // Pass identification, replacement for typeid
-    DCE() : FunctionPass((intptr_t)&ID) {}
+    DCE() : FunctionPass(ID) {
+      initializeDCEPass(*PassRegistry::getPassRegistry());
+    }
 
     virtual bool runOnFunction(Function &F);
 
@@ -76,11 +81,11 @@ namespace {
       AU.setPreservesCFG();
     }
  };
-
-  char DCE::ID = 0;
-  RegisterPass<DCE> Y("dce", "Dead Code Elimination");
 }
 
+char DCE::ID = 0;
+INITIALIZE_PASS(DCE, "dce", "Dead Code Elimination", false, false)
+
 bool DCE::runOnFunction(Function &F) {
   // Start out with all of the instructions in the worklist...
   std::vector<Instruction*> WorkList;
@@ -110,11 +115,12 @@ bool DCE::runOnFunction(Function &F) {
 
       // Remove the instruction from the worklist if it still exists in it.
       for (std::vector<Instruction*>::iterator WI = WorkList.begin();
-           WI != WorkList.end(); ++WI)
-        if (*WI == I) {
+           WI != WorkList.end(); ) {
+        if (*WI == I)
           WI = WorkList.erase(WI);
-          --WI;
-        }
+        else
+          ++WI;
+      }
 
       MadeChange = true;
       ++DCEEliminated;