Fix a warning [NFC]

[oota-llvm.git] / lib / CodeGen / LiveStackAnalysis.cpp

diff --git a/lib/CodeGen/LiveStackAnalysis.cpp b/lib/CodeGen/LiveStackAnalysis.cpp
index 2baf699c66c71f576e71cd5f1ec9301a1f8d3346..5c9c679e97ba114a7a1c1c414ebb7f3e903dee0b 100644 (file)
--- a/lib/CodeGen/LiveStackAnalysis.cpp
+++ b/lib/CodeGen/LiveStackAnalysis.cpp
@@ -13,39 +13,78 @@
 //
 //===----------------------------------------------------------------------===//
 
-#define DEBUG_TYPE "livestacks"
 #include "llvm/CodeGen/LiveStackAnalysis.h"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/CodeGen/LiveIntervalAnalysis.h"
 #include "llvm/CodeGen/Passes.h"
-#include "llvm/Target/TargetRegisterInfo.h"
 #include "llvm/Support/Debug.h"
-#include "llvm/ADT/Statistic.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/Target/TargetSubtargetInfo.h"
+#include <limits>
 using namespace llvm;
 
+#define DEBUG_TYPE "livestacks"
+
 char LiveStacks::ID = 0;
-static RegisterPass<LiveStacks> X("livestacks", "Live Stack Slot Analysis");
+INITIALIZE_PASS_BEGIN(LiveStacks, "livestacks",
+                "Live Stack Slot Analysis", false, false)
+INITIALIZE_PASS_DEPENDENCY(SlotIndexes)
+INITIALIZE_PASS_END(LiveStacks, "livestacks",
+                "Live Stack Slot Analysis", false, false)
+
+char &llvm::LiveStacksID = LiveStacks::ID;
 
 void LiveStacks::getAnalysisUsage(AnalysisUsage &AU) const {
   AU.setPreservesAll();
+  AU.addPreserved<SlotIndexes>();
+  AU.addRequiredTransitive<SlotIndexes>();
   MachineFunctionPass::getAnalysisUsage(AU);
 }
 
 void LiveStacks::releaseMemory() {
-  // Release VNInfo memroy regions after all VNInfo objects are dtor'd.
+  // Release VNInfo memory regions, VNInfo objects don't need to be dtor'd.
   VNInfoAllocator.Reset();
-  s2iMap.clear();
+  S2IMap.clear();
+  S2RCMap.clear();
 }
 
-bool LiveStacks::runOnMachineFunction(MachineFunction &) {
+bool LiveStacks::runOnMachineFunction(MachineFunction &MF) {
+  TRI = MF.getSubtarget().getRegisterInfo();
   // FIXME: No analysis is being done right now. We are relying on the
   // register allocators to provide the information.
   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.emplace(std::piecewise_construct, std::forward_as_tuple(Slot),
+                       std::forward_as_tuple(
+                           TargetRegisterInfo::index2StackSlot(Slot), 0.0F))
+            .first;
+    S2RCMap.insert(std::make_pair(Slot, RC));
+  } else {
+    // Use the largest common subclass register class.
+    const TargetRegisterClass *OldRC = S2RCMap[Slot];
+    S2RCMap[Slot] = TRI->getCommonSubClass(OldRC, RC);
+  }
+  return I->second;
+}
+
 /// print - Implement the dump method.
-void LiveStacks::print(std::ostream &O, const Module* ) const {
-  O << "********** INTERVALS **********\n";
+void LiveStacks::print(raw_ostream &OS, const Module*) const {
+
+  OS << "********** INTERVALS **********\n";
   for (const_iterator I = begin(), E = end(); I != E; ++I) {
-    I->second.print(O);
-    O << "\n";
+    I->second.print(OS);
+    int Slot = I->first;
+    const TargetRegisterClass *RC = getIntervalRegClass(Slot);
+    if (RC)
+      OS << " [" << TRI->getRegClassName(RC) << "]\n";
+    else
+      OS << " [Unknown]\n";
   }
 }