From 98b928ea71576c243bdb203879d966be9cde5f3c Mon Sep 17 00:00:00 2001
From: Anton Korobeynikov <asl@math.spbu.ru>
Date: Sun, 30 Jan 2011 22:07:39 +0000
Subject: [PATCH] Save a mapping between original and cloned constpool entries.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124570 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/ARM/ARMConstantIslandPass.cpp |  8 ++++++++
 lib/Target/ARM/ARMMachineFunctionInfo.h  | 17 +++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/lib/Target/ARM/ARMConstantIslandPass.cpp b/lib/Target/ARM/ARMConstantIslandPass.cpp
index 84499b118eb..dd81796e8aa 100644
--- a/lib/Target/ARM/ARMConstantIslandPass.cpp
+++ b/lib/Target/ARM/ARMConstantIslandPass.cpp
@@ -368,6 +368,14 @@ bool ARMConstantIslands::runOnMachineFunction(MachineFunction &MF) {
   if (isThumb && !HasFarJump && AFI->isLRSpilledForFarJump())
     MadeChange |= UndoLRSpillRestore();
 
+  // Save the mapping between original and cloned constpool entries.
+  for (unsigned i = 0, e = CPEntries.size(); i != e; ++i) {
+    for (unsigned j = 0, je = CPEntries[i].size(); j != je; ++j) {
+      const CPEntry & CPE = CPEntries[i][j];
+      AFI->recordCPEClone(i, CPE.CPI);
+    }
+  }
+
   DEBUG(errs() << '\n'; dumpBBs());
 
   BBSizes.clear();
diff --git a/lib/Target/ARM/ARMMachineFunctionInfo.h b/lib/Target/ARM/ARMMachineFunctionInfo.h
index 0eaa00ddec2..af8f812159e 100644
--- a/lib/Target/ARM/ARMMachineFunctionInfo.h
+++ b/lib/Target/ARM/ARMMachineFunctionInfo.h
@@ -95,6 +95,10 @@ class ARMFunctionInfo : public MachineFunctionInfo {
   /// HasITBlocks - True if IT blocks have been inserted.
   bool HasITBlocks;
 
+  /// CPEClones - Track constant pool entries clones created by Constant Island
+  /// pass.
+  DenseMap<unsigned, unsigned> CPEClones;
+
 public:
   ARMFunctionInfo() :
     isThumb(false),
@@ -244,6 +248,19 @@ public:
 
   bool hasITBlocks() const { return HasITBlocks; }
   void setHasITBlocks(bool h) { HasITBlocks = h; }
+
+  void recordCPEClone(unsigned CPIdx, unsigned CPCloneIdx) {
+    if (!CPEClones.insert(std::make_pair(CPCloneIdx, CPIdx)).second)
+      assert(0 && "Duplicate entries!");
+  }
+
+  unsigned getOriginalCPIdx(unsigned CloneIdx) const {
+    DenseMap<unsigned, unsigned>::const_iterator I = CPEClones.find(CloneIdx);
+    if (I != CPEClones.end())
+      return I->second;
+    else
+      return -1U;
+  }
 };
 } // End llvm namespace