misched: Fix RegisterPressureTracker handling of DebugVals.

Assertion failed: (TopRPTracker.getPos() == RegionBegin && "bad initial Top tracker").
rdar://12790302.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169072 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 14 insertions, 12 deletions

diff --git a/lib/CodeGen/RegisterPressure.cpp b/lib/CodeGen/RegisterPressure.cpp
index 543c426458..c7763dc55f 100644
--- a/lib/CodeGen/RegisterPressure.cpp
+++ b/lib/CodeGen/RegisterPressure.cpp
@@ -181,9 +181,6 @@ void RegPressureTracker::init(const MachineFunction *mf,
   }
 
   CurrPos = pos;
-  while (CurrPos != MBB->end() && CurrPos->isDebugValue())
-    ++CurrPos;
-
   CurrSetPressure.assign(TRI->getNumRegPressureSets(), 0);
 
   if (RequireIntervals)
@@ -214,11 +211,20 @@ bool RegPressureTracker::isBottomClosed() const {
           MachineBasicBlock::const_iterator());
 }
 
+
+SlotIndex RegPressureTracker::getCurrSlot() const {
+  MachineBasicBlock::const_iterator IdxPos = CurrPos;
+  while (IdxPos != MBB->end() && IdxPos->isDebugValue())
+    ++IdxPos;
+  if (IdxPos == MBB->end())
+    return LIS->getMBBEndIdx(MBB);
+  return LIS->getInstructionIndex(IdxPos).getRegSlot();
+}
+
 /// Set the boundary for the top of the region and summarize live ins.
 void RegPressureTracker::closeTop() {
   if (RequireIntervals)
-    static_cast<IntervalPressure&>(P).TopIdx =
-      LIS->getInstructionIndex(CurrPos).getRegSlot();
+    static_cast<IntervalPressure&>(P).TopIdx = getCurrSlot();
   else
     static_cast<RegionPressure&>(P).TopPos = CurrPos;
 
@@ -236,11 +242,7 @@ void RegPressureTracker::closeTop() {
 /// Set the boundary for the bottom of the region and summarize live outs.
 void RegPressureTracker::closeBottom() {
   if (RequireIntervals)
-    if (CurrPos == MBB->end())
-      static_cast<IntervalPressure&>(P).BottomIdx = LIS->getMBBEndIdx(MBB);
-    else
-      static_cast<IntervalPressure&>(P).BottomIdx =
-        LIS->getInstructionIndex(CurrPos).getRegSlot();
+    static_cast<IntervalPressure&>(P).BottomIdx = getCurrSlot();
   else
     static_cast<RegionPressure&>(P).BottomPos = CurrPos;
 
@@ -510,7 +512,7 @@ bool RegPressureTracker::advance() {
 
   SlotIndex SlotIdx;
   if (RequireIntervals)
-    SlotIdx = LIS->getInstructionIndex(CurrPos).getRegSlot();
+    SlotIdx = getCurrSlot();
 
   // Open the bottom of the region using slot indexes.
   if (isBottomClosed()) {
@@ -769,7 +771,7 @@ void RegPressureTracker::bumpDownwardPressure(const MachineInstr *MI) {
       const LiveInterval *LI = &LIS->getInterval(Reg);
       // FIXME: allow the caller to pass in the list of vreg uses that remain to
       // be bottom-scheduled to avoid searching uses at each query.
-      SlotIndex CurrIdx = LIS->getInstructionIndex(CurrPos).getRegSlot();
+      SlotIndex CurrIdx = getCurrSlot();
       if (LI->killedAt(SlotIdx)
           && !findUseBetween(Reg, CurrIdx, SlotIdx, MRI, LIS)) {
         decreaseVirtRegPressure(Reg);