X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FCodeGen%2FRegisterPressure.cpp;h=49c4cb0a824516310079bb613eb0400726331eba;hb=12af22e8cc217827cf4f118b0f5e4ebbda9925ae;hp=092ecdd9bb256e185ee6671412dd01df9aa7c3e8;hpb=d900b1179535298510490030a5d2ecce93f79eb0;p=oota-llvm.git

diff --git a/lib/CodeGen/RegisterPressure.cpp b/lib/CodeGen/RegisterPressure.cpp
index 092ecdd9bb2..49c4cb0a824 100644
--- a/lib/CodeGen/RegisterPressure.cpp
+++ b/lib/CodeGen/RegisterPressure.cpp
@@ -41,7 +41,7 @@ static void decreaseSetPressure(std::vector<unsigned> &CurrSetPressure,
   }
 }
 
-#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
+LLVM_DUMP_METHOD
 void llvm::dumpRegSetPressure(ArrayRef<unsigned> SetPressure,
                               const TargetRegisterInfo *TRI) {
   bool Empty = true;
@@ -55,6 +55,7 @@ void llvm::dumpRegSetPressure(ArrayRef<unsigned> SetPressure,
     dbgs() << "\n";
 }
 
+LLVM_DUMP_METHOD
 void RegisterPressure::dump(const TargetRegisterInfo *TRI) const {
   dbgs() << "Max Pressure: ";
   dumpRegSetPressure(MaxSetPressure, TRI);
@@ -68,6 +69,7 @@ void RegisterPressure::dump(const TargetRegisterInfo *TRI) const {
   dbgs() << '\n';
 }
 
+LLVM_DUMP_METHOD
 void RegPressureTracker::dump() const {
   if (!isTopClosed() || !isBottomClosed()) {
     dbgs() << "Curr Pressure: ";
@@ -75,7 +77,6 @@ void RegPressureTracker::dump() const {
   }
   P.dump(TRI);
 }
-#endif
 
 /// Increase the current pressure as impacted by these registers and bump
 /// the high water mark if needed.
@@ -154,8 +155,8 @@ const LiveRange *RegPressureTracker::getLiveRange(unsigned Reg) const {
 }
 
 void RegPressureTracker::reset() {
-  MBB = 0;
-  LIS = 0;
+  MBB = nullptr;
+  LIS = nullptr;
 
   CurrSetPressure.clear();
   LiveThruPressure.clear();
@@ -184,7 +185,7 @@ void RegPressureTracker::init(const MachineFunction *mf,
   reset();
 
   MF = mf;
-  TRI = MF->getTarget().getRegisterInfo();
+  TRI = MF->getSubtarget().getRegisterInfo();
   RCI = rci;
   MRI = &MF->getRegInfo();
   MBB = mbb;
@@ -506,7 +507,13 @@ bool RegPressureTracker::recede(SmallVectorImpl<unsigned> *LiveUses,
         DeadDef = LRQ.isDeadDef();
       }
     }
-    if (!DeadDef) {
+    if (DeadDef) {
+      // LiveIntervals knows this is a dead even though it's MachineOperand is
+      // not flagged as such. Since this register will not be recorded as
+      // live-out, increase its PDiff value to avoid underflowing pressure.
+      if (PDiff)
+        PDiff->addPressureChange(Reg, false, MRI);
+    } else {
       if (LiveRegs.erase(Reg))
         decreaseRegPressure(Reg);
       else
@@ -876,9 +883,9 @@ static bool findUseBetween(unsigned Reg,
                            SlotIndex PriorUseIdx, SlotIndex NextUseIdx,
                            const MachineRegisterInfo *MRI,
                            const LiveIntervals *LIS) {
-  for (MachineRegisterInfo::use_nodbg_iterator
-         UI = MRI->use_nodbg_begin(Reg), UE = MRI->use_nodbg_end();
-         UI != UE; UI.skipInstruction()) {
+  for (MachineRegisterInfo::use_instr_nodbg_iterator
+       UI = MRI->use_instr_nodbg_begin(Reg),
+       UE = MRI->use_instr_nodbg_end(); UI != UE; ++UI) {
       const MachineInstr* MI = &*UI;
       if (MI->isDebugValue())
         continue;