diff options
| -rw-r--r-- | lib/Transforms/Scalar/InstructionCombining.cpp | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index af85c5fdde..fe13a6ba54 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -2853,8 +2853,11 @@ Instruction *InstCombiner::visitLoadInst(LoadInst &LI) { 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)) |