Simplify this code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98853 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Analysis/ConstantFolding.cpp b/lib/Analysis/ConstantFolding.cpp
index 96bb02714a033f9d887a91e4bd5a2efa4dcb87fe..0ac512726ac18fec2afbbaa952bd6da5d0d7355a 100644 (file)
--- a/lib/Analysis/ConstantFolding.cpp
+++ b/lib/Analysis/ConstantFolding.cpp
@@ -564,21 +564,6 @@ static Constant *SymbolicallyEvaluateGEP(Constant *const *Ops, unsigned NumOps,
 
   unsigned BitWidth =
     TD->getTypeSizeInBits(TD->getIntPtrType(Ptr->getContext()));
-  APInt BasePtr(BitWidth, 0);
-  bool BaseIsInt = true;
-  if (!Ptr->isNullValue()) {
-    // If this is a inttoptr from a constant int, we can fold this as the base,
-    // otherwise we can't.
-    if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ptr))
-      if (CE->getOpcode() == Instruction::IntToPtr)
-        if (ConstantInt *Base = dyn_cast<ConstantInt>(CE->getOperand(0))) {
-          BasePtr = Base->getValue();
-          BasePtr.zextOrTrunc(BitWidth);
-        }
-    
-    if (BasePtr == 0)
-      BaseIsInt = false;
-  }
 
   // If this is a constant expr gep that is effectively computing an
   // "offsetof", fold it into 'cast int Size to T*' instead of 'gep 0, 0, 12'
@@ -615,7 +600,14 @@ static Constant *SymbolicallyEvaluateGEP(Constant *const *Ops, unsigned NumOps,
 
   // If the base value for this address is a literal integer value, fold the
   // getelementptr to the resulting integer value casted to the pointer type.
-  if (BaseIsInt) {
+  APInt BasePtr(BitWidth, 0);
+  if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ptr))
+    if (CE->getOpcode() == Instruction::IntToPtr)
+      if (ConstantInt *Base = dyn_cast<ConstantInt>(CE->getOperand(0))) {
+        BasePtr = Base->getValue();
+        BasePtr.zextOrTrunc(BitWidth);
+      }
+  if (Ptr->isNullValue() || BasePtr != 0) {
     Constant *C = ConstantInt::get(Ptr->getContext(), Offset+BasePtr);
     return ConstantExpr::getIntToPtr(C, ResultTy);
   }