diff --git a/lib/CodeGen/RegAllocLinearScan.cpp b/lib/CodeGen/RegAllocLinearScan.cpp
index fb97452..0121f15 100644
--- a/lib/CodeGen/RegAllocLinearScan.cpp
+++ b/lib/CodeGen/RegAllocLinearScan.cpp
@@ -33,9 +33,8 @@
 #include "llvm/ADT/SmallSet.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/ADT/STLExtras.h"
-#include "llvm/Support/Debug.h"
-#include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/Compiler.h"
+#include "llvm/Support/Debug.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/raw_ostream.h"
 #include <algorithm>
@@ -299,15 +298,20 @@
 
     template <typename ItTy>
     void printIntervals(const char* const str, ItTy i, ItTy e) const {
-      if (str) DOUT << str << " intervals:\n";
-      for (; i != e; ++i) {
-        DOUT << "\t" << *i->first << " -> ";
-        unsigned reg = i->first->reg;
-        if (TargetRegisterInfo::isVirtualRegister(reg)) {
-          reg = vrm_->getPhys(reg);
-        }
-        DOUT << tri_->getName(reg) << '\n';
-      }
+      DEBUG({
+          if (str)
+            errs() << str << " intervals:\n";
+
+          for (; i != e; ++i) {
+            errs() << "\t" << *i->first << " -> ";
+
+            unsigned reg = i->first->reg;
+            if (TargetRegisterInfo::isVirtualRegister(reg))
+              reg = vrm_->getPhys(reg);
+
+            errs() << tri_->getName(reg) << '\n';
+          }
+        });
     }
   };
   char RALinScan::ID = 0;
@@ -384,8 +388,8 @@
 
   // Try to coalesce.
   if (!li_->conflictsWithPhysRegDef(cur, *vrm_, PhysReg)) {
-    DOUT << "Coalescing: " << cur << " -> " << tri_->getName(PhysReg)
-         << '\n';
+    DEBUG(errs() << "Coalescing: " << cur << " -> " << tri_->getName(PhysReg)
+                 << '\n');
     vrm_->clearVirt(cur.reg);
     vrm_->assignVirt2Phys(cur.reg, PhysReg);
 
@@ -482,21 +486,21 @@
   }
 }
 
-void RALinScan::linearScan()
-{
+void RALinScan::linearScan() {
   // linear scan algorithm
-  DOUT << "********** LINEAR SCAN **********\n";
-  DEBUG(errs() << "********** Function: " 
-        << mf_->getFunction()->getName() << '\n');
-
-  DEBUG(printIntervals("fixed", fixed_.begin(), fixed_.end()));
+  DEBUG({
+      errs() << "********** LINEAR SCAN **********\n"
+             << "********** Function: " 
+             << mf_->getFunction()->getName() << '\n';
+      printIntervals("fixed", fixed_.begin(), fixed_.end());
+    });
 
   while (!unhandled_.empty()) {
     // pick the interval with the earliest start point
     LiveInterval* cur = unhandled_.top();
     unhandled_.pop();
     ++NumIters;
-    DOUT << "\n*** CURRENT ***: " << *cur << '\n';
+    DEBUG(errs() << "\n*** CURRENT ***: " << *cur << '\n');
 
     if (!cur->empty()) {
       processActiveIntervals(cur->beginNumber());
@@ -511,15 +515,17 @@
     // assign it one.
     assignRegOrStackSlotAtInterval(cur);
 
-    DEBUG(printIntervals("active", active_.begin(), active_.end()));
-    DEBUG(printIntervals("inactive", inactive_.begin(), inactive_.end()));
+    DEBUG({
+        printIntervals("active", active_.begin(), active_.end());
+        printIntervals("inactive", inactive_.begin(), inactive_.end());
+      });
   }
 
   // Expire any remaining active intervals
   while (!active_.empty()) {
     IntervalPtr &IP = active_.back();
     unsigned reg = IP.first->reg;
-    DOUT << "\tinterval " << *IP.first << " expired\n";
+    DEBUG(errs() << "\tinterval " << *IP.first << " expired\n");
     assert(TargetRegisterInfo::isVirtualRegister(reg) &&
            "Can only allocate virtual registers!");
     reg = vrm_->getPhys(reg);
@@ -528,9 +534,11 @@
   }
 
   // Expire any remaining inactive intervals
-  DEBUG(for (IntervalPtrs::reverse_iterator
-               i = inactive_.rbegin(); i != inactive_.rend(); ++i)
-        DOUT << "\tinterval " << *i->first << " expired\n");
+  DEBUG({
+      for (IntervalPtrs::reverse_iterator
+             i = inactive_.rbegin(); i != inactive_.rend(); ++i)
+        errs() << "\tinterval " << *i->first << " expired\n";
+    });
   inactive_.clear();
 
   // Add live-ins to every BB except for entry. Also perform trivial coalescing.
@@ -565,7 +573,7 @@
     }
   }
 
-  DOUT << *vrm_;
+  DEBUG(errs() << *vrm_);
 
   // Look for physical registers that end up not being allocated even though
   // register allocator had to spill other registers in its register class.
@@ -579,7 +587,7 @@
 /// to the inactive list.
 void RALinScan::processActiveIntervals(unsigned CurPoint)
 {
-  DOUT << "\tprocessing active intervals:\n";
+  DEBUG(errs() << "\tprocessing active intervals:\n");
 
   for (unsigned i = 0, e = active_.size(); i != e; ++i) {
     LiveInterval *Interval = active_[i].first;
@@ -589,7 +597,7 @@
     IntervalPos = Interval->advanceTo(IntervalPos, CurPoint);
 
     if (IntervalPos == Interval->end()) {     // Remove expired intervals.
-      DOUT << "\t\tinterval " << *Interval << " expired\n";
+      DEBUG(errs() << "\t\tinterval " << *Interval << " expired\n");
       assert(TargetRegisterInfo::isVirtualRegister(reg) &&
              "Can only allocate virtual registers!");
       reg = vrm_->getPhys(reg);
@@ -602,7 +610,7 @@
 
     } else if (IntervalPos->start > CurPoint) {
       // Move inactive intervals to inactive list.
-      DOUT << "\t\tinterval " << *Interval << " inactive\n";
+      DEBUG(errs() << "\t\tinterval " << *Interval << " inactive\n");
       assert(TargetRegisterInfo::isVirtualRegister(reg) &&
              "Can only allocate virtual registers!");
       reg = vrm_->getPhys(reg);
@@ -625,7 +633,7 @@
 /// ones to the active list.
 void RALinScan::processInactiveIntervals(unsigned CurPoint)
 {
-  DOUT << "\tprocessing inactive intervals:\n";
+  DEBUG(errs() << "\tprocessing inactive intervals:\n");
 
   for (unsigned i = 0, e = inactive_.size(); i != e; ++i) {
     LiveInterval *Interval = inactive_[i].first;
@@ -635,7 +643,7 @@
     IntervalPos = Interval->advanceTo(IntervalPos, CurPoint);
 
     if (IntervalPos == Interval->end()) {       // remove expired intervals.
-      DOUT << "\t\tinterval " << *Interval << " expired\n";
+      DEBUG(errs() << "\t\tinterval " << *Interval << " expired\n");
 
       // Pop off the end of the list.
       inactive_[i] = inactive_.back();
@@ -643,7 +651,7 @@
       --i; --e;
     } else if (IntervalPos->start <= CurPoint) {
       // move re-activated intervals in active list
-      DOUT << "\t\tinterval " << *Interval << " active\n";
+      DEBUG(errs() << "\t\tinterval " << *Interval << " active\n");
       assert(TargetRegisterInfo::isVirtualRegister(reg) &&
              "Can only allocate virtual registers!");
       reg = vrm_->getPhys(reg);
@@ -769,10 +777,12 @@
   float Conflicts[3] = { 0.0f, 0.0f, 0.0f };
   SmallVector<LiveInterval*, 8> SLIs[3];
 
-  DOUT << "\tConsidering " << NumCands << " candidates: ";
-  DEBUG(for (unsigned i = 0; i != NumCands; ++i)
-          DOUT << tri_->getName(Candidates[i].first) << " ";
-        DOUT << "\n";);
+  DEBUG({
+      errs() << "\tConsidering " << NumCands << " candidates: ";
+      for (unsigned i = 0; i != NumCands; ++i)
+        errs() << tri_->getName(Candidates[i].first) << " ";
+      errs() << "\n";
+    });
   
   // Calculate the number of conflicts of each candidate.
   for (IntervalPtrs::iterator i = active_.begin(); i != active_.end(); ++i) {
@@ -877,9 +887,8 @@
 
 /// assignRegOrStackSlotAtInterval - assign a register if one is available, or
 /// spill.
-void RALinScan::assignRegOrStackSlotAtInterval(LiveInterval* cur)
-{
-  DOUT << "\tallocating current interval: ";
+void RALinScan::assignRegOrStackSlotAtInterval(LiveInterval* cur) {
+  DEBUG(errs() << "\tallocating current interval: ");
 
   // This is an implicitly defined live interval, just assign any register.
   const TargetRegisterClass *RC = mri_->getRegClass(cur->reg);
@@ -887,7 +896,7 @@
     unsigned physReg = vrm_->getRegAllocPref(cur->reg);
     if (!physReg)
       physReg = *RC->allocation_order_begin(*mf_);
-    DOUT <<  tri_->getName(physReg) << '\n';
+    DEBUG(errs() <<  tri_->getName(physReg) << '\n');
     // Note the register is not really in use.
     vrm_->assignVirt2Phys(cur->reg, physReg);
     return;
@@ -1020,7 +1029,7 @@
   // the free physical register and add this interval to the active
   // list.
   if (physReg) {
-    DOUT <<  tri_->getName(physReg) << '\n';
+    DEBUG(errs() <<  tri_->getName(physReg) << '\n');
     vrm_->assignVirt2Phys(cur->reg, physReg);
     addRegUse(physReg);
     active_.push_back(std::make_pair(cur, cur->begin()));
@@ -1036,7 +1045,7 @@
     }
     return;
   }
-  DOUT << "no free registers\n";
+  DEBUG(errs() << "no free registers\n");
 
   // Compile the spill weights into an array that is better for scanning.
   std::vector<float> SpillWeights(tri_->getNumRegs(), 0.0f);
@@ -1054,7 +1063,7 @@
     updateSpillWeights(SpillWeights, reg, i->first->weight, RC);
   }
  
-  DOUT << "\tassigning stack slot at interval "<< *cur << ":\n";
+  DEBUG(errs() << "\tassigning stack slot at interval "<< *cur << ":\n");
 
   // Find a register to spill.
   float minWeight = HUGE_VALF;
@@ -1121,16 +1130,19 @@
     --LastCandidate;
   }
 
-  DOUT << "\t\tregister(s) with min weight(s): ";
-  DEBUG(for (unsigned i = 0; i != LastCandidate; ++i)
-          DOUT << tri_->getName(RegsWeights[i].first)
-               << " (" << RegsWeights[i].second << ")\n");
+  DEBUG({
+      errs() << "\t\tregister(s) with min weight(s): ";
+
+      for (unsigned i = 0; i != LastCandidate; ++i)
+        errs() << tri_->getName(RegsWeights[i].first)
+               << " (" << RegsWeights[i].second << ")\n";
+    });
 
   // If the current has the minimum weight, we need to spill it and
   // add any added intervals back to unhandled, and restart
   // linearscan.
   if (cur->weight != HUGE_VALF && cur->weight <= minWeight) {
-    DOUT << "\t\t\tspilling(c): " << *cur << '\n';
+    DEBUG(errs() << "\t\t\tspilling(c): " << *cur << '\n');
     SmallVector<LiveInterval*, 8> spillIs;
     std::vector<LiveInterval*> added;
     
@@ -1212,7 +1224,7 @@
   while (!spillIs.empty()) {
     LiveInterval *sli = spillIs.back();
     spillIs.pop_back();
-    DOUT << "\t\t\tspilling(a): " << *sli << '\n';
+    DEBUG(errs() << "\t\t\tspilling(a): " << *sli << '\n');
     earliestStartInterval =
       (earliestStartInterval->beginNumber() < sli->beginNumber()) ?
          earliestStartInterval : sli;
@@ -1230,7 +1242,7 @@
 
   unsigned earliestStart = earliestStartInterval->beginNumber();
 
-  DOUT << "\t\trolling back to: " << earliestStart << '\n';
+  DEBUG(errs() << "\t\trolling back to: " << earliestStart << '\n');
 
   // Scan handled in reverse order up to the earliest start of a
   // spilled live interval and undo each one, restoring the state of
@@ -1240,7 +1252,7 @@
     // If this interval starts before t we are done.
     if (i->beginNumber() < earliestStart)
       break;
-    DOUT << "\t\t\tundo changes for: " << *i << '\n';
+    DEBUG(errs() << "\t\t\tundo changes for: " << *i << '\n');
     handled_.pop_back();
 
     // When undoing a live interval allocation we must know if it is active or
@@ -1290,7 +1302,7 @@
     LiveInterval *HI = handled_[i];
     if (!HI->expiredAt(earliestStart) &&
         HI->expiredAt(cur->beginNumber())) {
-      DOUT << "\t\t\tundo changes for: " << *HI << '\n';
+      DEBUG(errs() << "\t\t\tundo changes for: " << *HI << '\n');
       active_.push_back(std::make_pair(HI, HI->begin()));
       assert(!TargetRegisterInfo::isPhysicalRegister(HI->reg));
       addRegUse(vrm_->getPhys(HI->reg));
@@ -1419,7 +1431,7 @@
   // available first.
   unsigned Preference = vrm_->getRegAllocPref(cur->reg);
   if (Preference) {
-    DOUT << "(preferred: " << tri_->getName(Preference) << ") ";
+    DEBUG(errs() << "(preferred: " << tri_->getName(Preference) << ") ");
     if (isRegAvail(Preference) && 
         RC->contains(Preference))
       return Preference;