From a92dced4a186c03f06a1e9156ca00d997ef0a972 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Wed, 3 Mar 2010 23:55:49 +0000
Subject: [PATCH] Remove PHINodeTraits and use MachineInstrExpressionTrait
 instead.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97687 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/PHIElimination.cpp | 31 -------------------------------
 lib/CodeGen/PHIElimination.h   | 10 ++--------
 2 files changed, 2 insertions(+), 39 deletions(-)

diff --git a/lib/CodeGen/PHIElimination.cpp b/lib/CodeGen/PHIElimination.cpp
index bdfd448acdb..8bbe0a72528 100644
--- a/lib/CodeGen/PHIElimination.cpp
+++ b/lib/CodeGen/PHIElimination.cpp
@@ -443,34 +443,3 @@ MachineBasicBlock *PHIElimination::SplitCriticalEdge(MachineBasicBlock *A,
 
   return NMBB;
 }
-
-unsigned
-PHIElimination::PHINodeTraits::getHashValue(const MachineInstr *MI) {
-  if (!MI || MI==getEmptyKey() || MI==getTombstoneKey())
-    return DenseMapInfo<MachineInstr*>::getHashValue(MI);
-  unsigned hash = 0;
-  for (unsigned ni = 1, ne = MI->getNumOperands(); ni != ne; ni += 2)
-    hash = hash*37 + DenseMapInfo<BBVRegPair>::
-      getHashValue(BBVRegPair(MI->getOperand(ni+1).getMBB()->getNumber(),
-                              MI->getOperand(ni).getReg()));
-  return hash;
-}
-
-bool PHIElimination::PHINodeTraits::isEqual(const MachineInstr *LHS,
-                                            const MachineInstr *RHS) {
-  const MachineInstr *EmptyKey = getEmptyKey();
-  const MachineInstr *TombstoneKey = getTombstoneKey();
-  if (!LHS || !RHS || LHS==EmptyKey || RHS==EmptyKey ||
-      LHS==TombstoneKey || RHS==TombstoneKey)
-    return LHS==RHS;
-
-  unsigned ne = LHS->getNumOperands();
-  if (ne != RHS->getNumOperands())
-      return false;
-  // Ignore operand 0, the defined register.
-  for (unsigned ni = 1; ni != ne; ni += 2)
-    if (LHS->getOperand(ni).getReg() != RHS->getOperand(ni).getReg() ||
-        LHS->getOperand(ni+1).getMBB() != RHS->getOperand(ni+1).getMBB())
-      return false;
-  return true;
-}
diff --git a/lib/CodeGen/PHIElimination.h b/lib/CodeGen/PHIElimination.h
index ff4aa209185..7dedf0318a8 100644
--- a/lib/CodeGen/PHIElimination.h
+++ b/lib/CodeGen/PHIElimination.h
@@ -102,15 +102,9 @@ namespace llvm {
     // Defs of PHI sources which are implicit_def.
     SmallPtrSet<MachineInstr*, 4> ImpDefs;
 
-    // Lowered PHI nodes may be reused. We provide special DenseMap traits to
-    // match PHI nodes with identical arguments.
-    struct PHINodeTraits : public DenseMapInfo<MachineInstr*> {
-      static unsigned getHashValue(const MachineInstr *PtrVal);
-      static bool isEqual(const MachineInstr *LHS, const MachineInstr *RHS);
-    };
-
     // Map reusable lowered PHI node -> incoming join register.
-    typedef DenseMap<MachineInstr*, unsigned, PHINodeTraits> LoweredPHIMap;
+    typedef DenseMap<MachineInstr*, unsigned,
+                     MachineInstrExpressionTrait> LoweredPHIMap;
     LoweredPHIMap LoweredPHIs;
   };
 
-- 
2.34.1