for (BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ) {
// Ignore non-calls.
CallInst *CI = dyn_cast<CallInst>(I++);
- if (!CI) continue;
+ if (!CI || CI->hasFnAttr(Attribute::NoBuiltin)) continue;
// Ignore indirect calls and calls to non-external functions.
Function *Callee = CI->getCalledFunction();