Subzero: Register allocator performance improvements and simplifications.

src/IceLiveness.cpp

 //===- subzero/src/IceLiveness.cpp - Liveness analysis implementation -----===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file provides some of the support for the Liveness class.  In
@@ skipping 17 matching lines @@
 
 namespace Ice {
 
 void Liveness::init() {
   // Initialize most of the container sizes.
   SizeT NumVars = Func->getVariables().size();
   SizeT NumNodes = Func->getNumNodes();
   VariablesMetadata *VMetadata = Func->getVMetadata();
   Nodes.resize(NumNodes);
   VarToLiveMap.resize(NumVars);
-  if (Mode == Liveness_Intervals)
-    LiveRanges.resize(NumVars);
 
   // Count the number of globals, and the number of locals for each
   // block.
   for (SizeT i = 0; i < NumVars; ++i) {
     Variable *Var = Func->getVariables()[i];
     if (VMetadata->isMultiBlock(Var)) {
       ++NumGlobals;
     } else {
       SizeT Index = VMetadata->getLocalUseNode(Var)->getIndex();
       ++Nodes[Index].NumLocals;
@@ skipping 41 matching lines @@
   }
 }
 
 Variable *Liveness::getVariable(SizeT LiveIndex, const CfgNode *Node) const {
   if (LiveIndex < NumGlobals)
     return LiveToVarMap[LiveIndex];
   SizeT NodeIndex = Node->getIndex();
   return Nodes[NodeIndex].LiveToVarMap[LiveIndex - NumGlobals];
 }
 
-void Liveness::addLiveRange(Variable *Var, InstNumberT Start, InstNumberT End,
-                            uint32_t WeightDelta) {
-  LiveRange &LiveRange = LiveRanges[Var->getIndex()];
-  assert(WeightDelta != RegWeight::Inf);
-  LiveRange.addSegment(Start, End);
-  LiveRange.addWeight(WeightDelta);
-}
-
-LiveRange &Liveness::getLiveRange(Variable *Var) {
-  return LiveRanges[Var->getIndex()];
-}
-
 } // end of namespace Ice