[llvm-commits] [llvm] r96837 - in /llvm/trunk/lib/CodeGen: PHIElimination.cpp PHIElimination.h

[Jakob Stoklund Olesen]

Author: stoklund
Date: Mon Feb 22 18:28:53 2010
New Revision: 96837

URL: http://llvm.org/viewvc/llvm-project?rev=96837&view=rev
Log:
Dead code elimination

Modified:
    llvm/trunk/lib/CodeGen/PHIElimination.cpp
    llvm/trunk/lib/CodeGen/PHIElimination.h

Modified: llvm/trunk/lib/CodeGen/PHIElimination.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/PHIElimination.cpp?rev=96837&r1=96836&r2=96837&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/PHIElimination.cpp (original)
+++ llvm/trunk/lib/CodeGen/PHIElimination.cpp Mon Feb 22 18:28:53 2010
@@ -55,7 +55,6 @@
 bool llvm::PHIElimination::runOnMachineFunction(MachineFunction &Fn) {
   MRI = &Fn.getRegInfo();
 
-  PHIDefs.clear();
   bool Changed = false;
 
   // Split critical edges to help the coalescer
@@ -214,10 +213,6 @@
     TII->copyRegToReg(MBB, AfterPHIsIt, DestReg, IncomingReg, RC, RC);
   }
 
-  // Record PHI def.
-  assert(!hasPHIDef(DestReg) && "Vreg has multiple phi-defs?");
-  PHIDefs[DestReg] = &MBB;
-
   // Update live variable information if there is any.
   LiveVariables *LV = getAnalysisIfAvailable<LiveVariables>();
   if (LV) {

Modified: llvm/trunk/lib/CodeGen/PHIElimination.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/PHIElimination.h?rev=96837&r1=96836&r2=96837&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/PHIElimination.h (original)
+++ llvm/trunk/lib/CodeGen/PHIElimination.h Mon Feb 22 18:28:53 2010
@@ -22,10 +22,8 @@
   /// Lower PHI instructions to copies.  
   class PHIElimination : public MachineFunctionPass {
     MachineRegisterInfo  *MRI; // Machine register information
-    typedef DenseMap<unsigned, MachineBasicBlock*> PHIDefMap;
 
   public:
-
     static char ID; // Pass identification, replacement for typeid
     PHIElimination() : MachineFunctionPass(&ID) {}
 
@@ -33,12 +31,6 @@
     
     virtual void getAnalysisUsage(AnalysisUsage &AU) const;
 
-    /// Return true if the given vreg was defined by a PHI intsr prior to
-    /// lowering.
-    bool hasPHIDef(unsigned vreg) const {
-      return PHIDefs.count(vreg);
-    }
-
   private:
     /// EliminatePHINodes - Eliminate phi nodes by inserting copy instructions
     /// in predecessor basic blocks.
@@ -106,7 +98,6 @@
     typedef DenseMap<BBVRegPair, unsigned> VRegPHIUse;
 
     VRegPHIUse VRegPHIUseCount;
-    PHIDefMap PHIDefs;
 
     // Defs of PHI sources which are implicit_def.
     SmallPtrSet<MachineInstr*, 4> ImpDefs;