Value *Op = LI.getOperand(0);
if (LI.isVolatile()) return 0;
Value *Op = LI.getOperand(0);
if (LI.isVolatile()) return 0;
- if (ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(Op))
- Op = CPR->getValue();
+ if (Constant *C = dyn_cast<Constant>(Op))
+ if (C->isNullValue()) // load null -> 0
+ return ReplaceInstUsesWith(LI, Constant::getNullValue(LI.getType()));
+ else if (ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(C))
+ Op = CPR->getValue();
// Instcombine load (constant global) into the value loaded...
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Op))
// Instcombine load (constant global) into the value loaded...
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Op))