inline InstVal &getValueState(Value *V) {
hash_map<Value*, InstVal>::iterator I = ValueState.find(V);
if (I != ValueState.end()) return I->second; // Common case, in the map
-
- if (Constant *CPV = dyn_cast<Constant>(V)) { // Constants are constant
- ValueState[CPV].markConstant(CPV);
+
+ if (isa<UndefValue>(V)) {
+ // Nothing to do, remain undefined.
+ } else if (Constant *CPV = dyn_cast<Constant>(V)) {
+ ValueState[CPV].markConstant(CPV); // Constants are constant
} else if (isa<Argument>(V)) { // Arguments are overdefined
ValueState[V].markOverdefined();
}
visitTerminatorInst(I);
}
void visitUnwindInst (TerminatorInst &I) { /*returns void*/ }
+ void visitUnreachableInst(TerminatorInst &I) { /*returns void*/ }
void visitAllocationInst(Instruction &I) { markOverdefined(&I); }
void visitVANextInst (Instruction &I) { markOverdefined(&I); }
void visitVAArgInst (Instruction &I) { markOverdefined(&I); }