Vendor import of llvm trunk r126079:

http://llvm.org/svn/llvm-project/llvm/trunk@126079

1 files changed, 19 insertions, 1 deletions

diff --git a/lib/CodeGen/LiveStackAnalysis.cpp b/lib/CodeGen/LiveStackAnalysis.cpp
index b5c385f..c75196a 100644
--- a/lib/CodeGen/LiveStackAnalysis.cpp
+++ b/lib/CodeGen/LiveStackAnalysis.cpp
@@ -26,7 +26,9 @@ using namespace llvm;
 
 char LiveStacks::ID = 0;
 INITIALIZE_PASS(LiveStacks, "livestacks",
-                "Live Stack Slot Analysis", false, false);
+                "Live Stack Slot Analysis", false, false)
+
+char &llvm::LiveStacksID = LiveStacks::ID;
 
 void LiveStacks::getAnalysisUsage(AnalysisUsage &AU) const {
   AU.setPreservesAll();
@@ -48,6 +50,22 @@ bool LiveStacks::runOnMachineFunction(MachineFunction &) {
   return false;
 }
 
+LiveInterval &
+LiveStacks::getOrCreateInterval(int Slot, const TargetRegisterClass *RC) {
+  assert(Slot >= 0 && "Spill slot indice must be >= 0");
+  SS2IntervalMap::iterator I = S2IMap.find(Slot);
+  if (I == S2IMap.end()) {
+    I = S2IMap.insert(I, std::make_pair(Slot,
+            LiveInterval(TargetRegisterInfo::index2StackSlot(Slot), 0.0F)));
+    S2RCMap.insert(std::make_pair(Slot, RC));
+  } else {
+    // Use the largest common subclass register class.
+    const TargetRegisterClass *OldRC = S2RCMap[Slot];
+    S2RCMap[Slot] = getCommonSubClass(OldRC, RC);
+  }
+  return I->second;
+}
+
 /// print - Implement the dump method.
 void LiveStacks::print(raw_ostream &OS, const Module*) const {