From 8e6d64a71d043f088867c7bcc590e05d90c856b3 Mon Sep 17 00:00:00 2001
From: Zhou Sheng <zhousheng00@gmail.com>
Date: Sat, 1 Dec 2012 10:54:28 +0000
Subject: Revert previous check in r168581, r169079 as they are still in code
 review status.

llvm-svn: 169083
---
 llvm/lib/Transforms/IPO/GlobalOpt.cpp | 26 ++++----------------------
 1 file changed, 4 insertions(+), 22 deletions(-)

(limited to 'llvm/lib/Transforms/IPO/GlobalOpt.cpp')

diff --git a/llvm/lib/Transforms/IPO/GlobalOpt.cpp b/llvm/lib/Transforms/IPO/GlobalOpt.cpp
index 54b97fabdc5..591278fa62c 100644
--- a/llvm/lib/Transforms/IPO/GlobalOpt.cpp
+++ b/llvm/lib/Transforms/IPO/GlobalOpt.cpp
@@ -36,7 +36,6 @@
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/ADT/SmallVector.h"
-#include "llvm/ADT/SetVector.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/ADT/STLExtras.h"
 #include <algorithm>
@@ -2399,8 +2398,7 @@ static bool isSimpleEnoughPointerToCommit(Constant *C) {
 /// initializer.  This returns 'Init' modified to reflect 'Val' stored into it.
 /// At this point, the GEP operands of Addr [0, OpNo) have been stepped into.
 static Constant *EvaluateStoreInto(Constant *Init, Constant *Val,
-                                   ConstantExpr *Addr, unsigned OpNo,
-                                   SetVector<Constant*>& Obsolete) {
+                                   ConstantExpr *Addr, unsigned OpNo) {
   // Base case of the recursion.
   if (OpNo == Addr->getNumOperands()) {
     assert(Val->getType() == Init->getType() && "Type mismatch!");
@@ -2417,9 +2415,7 @@ static Constant *EvaluateStoreInto(Constant *Init, Constant *Val,
     ConstantInt *CU = cast<ConstantInt>(Addr->getOperand(OpNo));
     unsigned Idx = CU->getZExtValue();
     assert(Idx < STy->getNumElements() && "Struct index out of range!");
-    if (Elts[Idx]->getType()->isAggregateType())
-      Obsolete.insert(Elts[Idx]);
-    Elts[Idx] = EvaluateStoreInto(Elts[Idx], Val, Addr, OpNo+1, Obsolete);
+    Elts[Idx] = EvaluateStoreInto(Elts[Idx], Val, Addr, OpNo+1);
 
     // Return the modified struct.
     return ConstantStruct::get(STy, Elts);
@@ -2439,11 +2435,8 @@ static Constant *EvaluateStoreInto(Constant *Init, Constant *Val,
     Elts.push_back(Init->getAggregateElement(i));
 
   assert(CI->getZExtValue() < NumElts);
-  Constant *OrigElem = Elts[CI->getZExtValue()];
-  if (OrigElem->getType()->isAggregateType())
-    Obsolete.insert(OrigElem);
   Elts[CI->getZExtValue()] =
-    EvaluateStoreInto(OrigElem, Val, Addr, OpNo+1, Obsolete);
+    EvaluateStoreInto(Elts[CI->getZExtValue()], Val, Addr, OpNo+1);
 
   if (Init->getType()->isArrayTy())
     return ConstantArray::get(cast<ArrayType>(InitTy), Elts);
@@ -2459,20 +2452,9 @@ static void CommitValueTo(Constant *Val, Constant *Addr) {
     return;
   }
 
-  // Collect obsolete constants created in previous CommitValueTo() invoke.
-  SetVector<Constant*> Obsolete;
   ConstantExpr *CE = cast<ConstantExpr>(Addr);
   GlobalVariable *GV = cast<GlobalVariable>(CE->getOperand(0));
-  Constant *OrigInit = GV->getInitializer();
-  if (OrigInit->getType()->isAggregateType())
-    Obsolete.insert(OrigInit);
-  Constant *Init = EvaluateStoreInto(OrigInit, Val, CE, 2, Obsolete);
-  GV->setInitializer(Init);
-
-  for (unsigned i = 0; i < Obsolete.size(); ++i) {
-    if (Obsolete[i]->use_empty())
-      Obsolete[i]->destroyConstant();
-  }
+  GV->setInitializer(EvaluateStoreInto(GV->getInitializer(), Val, CE, 2));
 }
 
 namespace {
-- 
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