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Simplify this code. 

llvm-svn: 98853
This commit is contained in:
Dan Gohman 2010-03-18 19:34:33 +00:00
parent f9c044f6dc
commit a5ca578384
1 changed files with 8 additions and 16 deletions
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24
llvm/lib/Analysis/ConstantFolding.cpp
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@ -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);
}