Delete dead code.

Local live range splitting is better driven by interference. This code was just
guessing.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126799 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/SplitKit.cpp b/lib/CodeGen/SplitKit.cpp
index fd5d50b7ecb8d6731d821a9bf26842822a5e412d..ef0d39b9571cc23d74c850531e33869e391f89a9 100644 (file)
--- a/lib/CodeGen/SplitKit.cpp
+++ b/lib/CodeGen/SplitKit.cpp
@@ -973,72 +973,3 @@ void SplitEditor::splitSingleBlocks(const SplitAnalysis::BlockPtrSet &Blocks) {
   }
   finish();
 }
-
-
-//===----------------------------------------------------------------------===//
-//                            Sub Block Splitting
-//===----------------------------------------------------------------------===//
-
-/// getBlockForInsideSplit - If CurLI is contained inside a single basic block,
-/// and it wou pay to subdivide the interval inside that block, return it.
-/// Otherwise return NULL. The returned block can be passed to
-/// SplitEditor::splitInsideBlock.
-const MachineBasicBlock *SplitAnalysis::getBlockForInsideSplit() {
-  // The interval must be exclusive to one block.
-  if (UsingBlocks.size() != 1)
-    return 0;
-  // Don't to this for less than 4 instructions. We want to be sure that
-  // splitting actually reduces the instruction count per interval.
-  if (UsingInstrs.size() < 4)
-    return 0;
-  return UsingBlocks.begin()->first;
-}
-
-/// splitInsideBlock - Split CurLI into multiple intervals inside MBB.
-void SplitEditor::splitInsideBlock(const MachineBasicBlock *MBB) {
-  SmallVector<SlotIndex, 32> Uses;
-  Uses.reserve(SA.UsingInstrs.size());
-  for (SplitAnalysis::InstrPtrSet::const_iterator I = SA.UsingInstrs.begin(),
-       E = SA.UsingInstrs.end(); I != E; ++I)
-    if ((*I)->getParent() == MBB)
-      Uses.push_back(LIS.getInstructionIndex(*I));
-  DEBUG(dbgs() << "  splitInsideBlock BB#" << MBB->getNumber() << " for "
-               << Uses.size() << " instructions.\n");
-  assert(Uses.size() >= 3 && "Need at least 3 instructions");
-  array_pod_sort(Uses.begin(), Uses.end());
-
-  // Simple algorithm: Find the largest gap between uses as determined by slot
-  // indices. Create new intervals for instructions before the gap and after the
-  // gap.
-  unsigned bestPos = 0;
-  int bestGap = 0;
-  DEBUG(dbgs() << "    dist (" << Uses[0]);
-  for (unsigned i = 1, e = Uses.size(); i != e; ++i) {
-    int g = Uses[i-1].distance(Uses[i]);
-    DEBUG(dbgs() << ") -" << g << "- (" << Uses[i]);
-    if (g > bestGap)
-      bestPos = i, bestGap = g;
-  }
-  DEBUG(dbgs() << "), best: -" << bestGap << "-\n");
-
-  // bestPos points to the first use after the best gap.
-  assert(bestPos > 0 && "Invalid gap");
-
-  // FIXME: Don't create intervals for low densities.
-
-  // First interval before the gap. Don't create single-instr intervals.
-  if (bestPos > 1) {
-    openIntv();
-    useIntv(enterIntvBefore(Uses.front()), leaveIntvAfter(Uses[bestPos-1]));
-    closeIntv();
-  }
-
-  // Second interval after the gap.
-  if (bestPos < Uses.size()-1) {
-    openIntv();
-    useIntv(enterIntvBefore(Uses[bestPos]), leaveIntvAfter(Uses.back()));
-    closeIntv();
-  }
-
-  finish();
-}

diff --git a/lib/CodeGen/SplitKit.h b/lib/CodeGen/SplitKit.h
index e02e6297035dadae7578040410242049d657836a..a57aa1a01f00868c5d6a80d95d2d14fca964d30d 100644 (file)
--- a/lib/CodeGen/SplitKit.h
+++ b/lib/CodeGen/SplitKit.h
@@ -141,12 +141,6 @@ public:
   /// having CurLI split to a new live interval. Return true if Blocks can be
   /// passed to SplitEditor::splitSingleBlocks.
   bool getMultiUseBlocks(BlockPtrSet &Blocks);
-
-  /// getBlockForInsideSplit - If CurLI is contained inside a single basic
-  /// block, and it would pay to subdivide the interval inside that block,
-  /// return it. Otherwise return NULL. The returned block can be passed to
-  /// SplitEditor::splitInsideBlock.
-  const MachineBasicBlock *getBlockForInsideSplit();
 };
 
 
@@ -385,9 +379,6 @@ public:
   /// splitSingleBlocks - Split CurLI into a separate live interval inside each
   /// basic block in Blocks.
   void splitSingleBlocks(const SplitAnalysis::BlockPtrSet &Blocks);
-
-  /// splitInsideBlock - Split CurLI into multiple intervals inside MBB.
-  void splitInsideBlock(const MachineBasicBlock *);
 };
 
 }