From e7862f29ec6f623a3263631c9675aa73f02a537d Mon Sep 17 00:00:00 2001
From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Wed, 17 Feb 2010 19:13:56 +0000
Subject: [PATCH] Dead code elimination.

llvm-svn: 96496
---
 lib/CodeGen/PHIElimination.cpp |  4 ----
 lib/CodeGen/PHIElimination.h   | 34 ----------------------------------
 2 files changed, 38 deletions(-)

diff --git a/lib/CodeGen/PHIElimination.cpp b/lib/CodeGen/PHIElimination.cpp
index b740c68f596..bc49d0de223 100644
--- a/lib/CodeGen/PHIElimination.cpp
+++ b/lib/CodeGen/PHIElimination.cpp
@@ -56,7 +56,6 @@ bool llvm::PHIElimination::runOnMachineFunction(MachineFunction &Fn) {
   MRI = &Fn.getRegInfo();
 
   PHIDefs.clear();
-  PHIKills.clear();
   bool Changed = false;
 
   // Split critical edges to help the coalescer
@@ -276,9 +275,6 @@ void llvm::PHIElimination::LowerAtomicPHINode(
     // path the PHI.
     MachineBasicBlock &opBlock = *MPhi->getOperand(i*2+2).getMBB();
 
-    // Record the kill.
-    PHIKills[SrcReg].insert(&opBlock);
-
     // If source is defined by an implicit def, there is no need to insert a
     // copy.
     MachineInstr *DefMI = MRI->getVRegDef(SrcReg);
diff --git a/lib/CodeGen/PHIElimination.h b/lib/CodeGen/PHIElimination.h
index f3ab9e27dbf..110721d01d6 100644
--- a/lib/CodeGen/PHIElimination.h
+++ b/lib/CodeGen/PHIElimination.h
@@ -22,17 +22,10 @@ namespace llvm {
   /// Lower PHI instructions to copies.  
   class PHIElimination : public MachineFunctionPass {
     MachineRegisterInfo  *MRI; // Machine register information
-  private:
-
-    typedef SmallSet<MachineBasicBlock*, 4> PHIKillList;
-    typedef DenseMap<unsigned, PHIKillList> PHIKillMap;
     typedef DenseMap<unsigned, MachineBasicBlock*> PHIDefMap;
 
   public:
 
-    typedef PHIKillList::iterator phi_kill_iterator;
-    typedef PHIKillList::const_iterator const_phi_kill_iterator;
-
     static char ID; // Pass identification, replacement for typeid
     PHIElimination() : MachineFunctionPass(&ID) {}
 
@@ -46,32 +39,6 @@ namespace llvm {
       return PHIDefs.count(vreg);
     }
 
-    /// Returns the block in which the PHI instruction which defined the
-    /// given vreg used to reside. 
-    MachineBasicBlock* getPHIDefBlock(unsigned vreg) {
-      PHIDefMap::iterator phiDefItr = PHIDefs.find(vreg);
-      assert(phiDefItr != PHIDefs.end() && "vreg has no phi-def.");
-      return phiDefItr->second;
-    }
-
-    /// Returns true if the given vreg was killed by a PHI instr.
-    bool hasPHIKills(unsigned vreg) const {
-      return PHIKills.count(vreg);
-    }
-
-    /// Returns an iterator over the BasicBlocks which contained PHI
-    /// kills of this register prior to lowering.
-    phi_kill_iterator phiKillsBegin(unsigned vreg) {
-      PHIKillMap::iterator phiKillItr = PHIKills.find(vreg);
-      assert(phiKillItr != PHIKills.end() && "vreg has no phi-kills.");
-      return phiKillItr->second.begin();
-    } 
-    phi_kill_iterator phiKillsEnd(unsigned vreg) {
-      PHIKillMap::iterator phiKillItr = PHIKills.find(vreg);
-      assert(phiKillItr != PHIKills.end() && "vreg has no phi-kills.");
-      return phiKillItr->second.end();
-    }
-
   private:
     /// EliminatePHINodes - Eliminate phi nodes by inserting copy instructions
     /// in predecessor basic blocks.
@@ -140,7 +107,6 @@ namespace llvm {
 
     VRegPHIUse VRegPHIUseCount;
     PHIDefMap PHIDefs;
-    PHIKillMap PHIKills;
 
     // Defs of PHI sources which are implicit_def.
     SmallPtrSet<MachineInstr*, 4> ImpDefs;