Move LiveIntervalMap::extendTo into LiveInterval itself.

This method could probably be used by LiveIntervalAnalysis::shrinkToUses, and
now it can use extendIntervalEndTo() which coalesces ranges.

llvm-svn: 126803

llvm/include/llvm/CodeGen/LiveInterval.h

@@ -447,6 +447,11 @@ namespace llvm {
       addRangeFrom(LR, ranges.begin());
     }
 
+    /// extendInBlock - If this interval is live before UseIdx in the basic
+    /// block that starts at StartIdx, extend it to be live at UseIdx and return
+    /// the value. If there is no live range before UseIdx, return NULL.
+    VNInfo *extendInBlock(SlotIndex StartIdx, SlotIndex UseIdx);
+
     /// join - Join two live intervals (this, and other) together.  This applies
     /// mappings to the value numbers in the LHS/RHS intervals as specified.  If
     /// the intervals are not joinable, this aborts.

llvm/lib/CodeGen/LiveInterval.cpp

@@ -291,6 +291,22 @@ LiveInterval::addRangeFrom(LiveRange LR, iterator From) {
   return ranges.insert(it, LR);
 }
 
+/// extendInBlock - If this interval is live before UseIdx in the basic
+/// block that starts at StartIdx, extend it to be live at UseIdx and return
+/// the value. If there is no live range before UseIdx, return NULL.
+VNInfo *LiveInterval::extendInBlock(SlotIndex StartIdx, SlotIndex UseIdx) {
+  if (empty())
+    return 0;
+  iterator I = std::upper_bound(begin(), end(), UseIdx);
+  if (I == begin())
+    return 0;
+  --I;
+  if (I->end <= StartIdx)
+    return 0;
+  if (I->end <= UseIdx)
+    extendIntervalEndTo(I, UseIdx.getNextSlot());
+  return I->valno;
+}
 
 /// removeRange - Remove the specified range from this interval.  Note that
 /// the range must be in a single LiveRange in its entirety.

llvm/lib/CodeGen/SplitKit.cpp

@@ -230,7 +230,7 @@ VNInfo *LiveIntervalMap::mapValue(const VNInfo *ParentVNI, SlotIndex Idx,
   assert(IdxMBB && "No MBB at Idx");
 
   // Is there a def in the same MBB we can extend?
-  if (VNInfo *VNI = extendTo(IdxMBB, Idx))
+  if (VNInfo *VNI = LI->extendInBlock(LIS.getMBBStartIdx(IdxMBB), Idx))
     return VNI;
 
   // Now for the fun part. We know that ParentVNI potentially has multiple defs,
@@ -262,8 +262,10 @@ VNInfo *LiveIntervalMap::mapValue(const VNInfo *ParentVNI, SlotIndex Idx,
        }
 
        // Does Pred provide a live-out value?
-       SlotIndex Last = LIS.getMBBEndIdx(Pred).getPrevSlot();
-       if (VNInfo *VNI = extendTo(Pred, Last)) {
+       SlotIndex Start, Last;
+       tie(Start, Last) = LIS.getSlotIndexes()->getMBBRange(Pred);
+       Last = Last.getPrevSlot();
+       if (VNInfo *VNI = LI->extendInBlock(Start, Last)) {
          MachineBasicBlock *DefMBB = LIS.getMBBFromIndex(VNI->def);
          DEBUG(dbgs() << "    found valno #" << VNI->id
                       << " from BB#" << DefMBB->getNumber()
@@ -429,22 +431,6 @@ void LiveIntervalMap::dumpCache() {
 }
 #endif
 
-// extendTo - Find the last LI value defined in MBB at or before Idx. The
-// ParentLI is assumed to be live at Idx. Extend the live range to Idx.
-// Return the found VNInfo, or NULL.
-VNInfo *LiveIntervalMap::extendTo(const MachineBasicBlock *MBB, SlotIndex Idx) {
-  assert(LI && "call reset first");
-  LiveInterval::iterator I = std::upper_bound(LI->begin(), LI->end(), Idx);
-  if (I == LI->begin())
-    return 0;
-  --I;
-  if (I->end <= LIS.getMBBStartIdx(MBB))
-    return 0;
-  if (I->end <= Idx)
-    I->end = Idx.getNextSlot();
-  return I->valno;
-}
-
 
 //===----------------------------------------------------------------------===//
 //                               Split Editor

llvm/lib/CodeGen/SplitKit.h

@@ -205,11 +205,6 @@ public:
   /// If simple is not NULL, *simple will indicate if ParentVNI is a simply
   /// mapped value.
   VNInfo *mapValue(const VNInfo *ParentVNI, SlotIndex Idx, bool *simple = 0);
-
-  // extendTo - Find the last LI value defined in MBB at or before Idx. The
-  // parentli is assumed to be live at Idx. Extend the live range to include
-  // Idx. Return the found VNInfo, or NULL.
-  VNInfo *extendTo(const MachineBasicBlock *MBB, SlotIndex Idx);
 };