[LLVMdev] difference between replaceAllUsesWith and replaceUsesOfWith?

[Rob Jansen]

Why is the first for loop not equivalent to the second?

Thanks,
Rob

===========================

for (GlobalVariable **i = Globals.begin(), **e = Globals.end(); i != e;
++i) {
  GlobalVariable *GV = *i;

  Constant *GEP = ConstantExpr::getGetElementPtr(...);
  GV->replaceAllUsesWith(GEP);
}

===========================

for (GlobalVariable **i = Globals.begin(), **e = Globals.end(); i != e;
++i) {
  GlobalVariable *GV = *i;

  Constant *GEP = ConstantExpr::getGetElementPtr(...);

for (Value::use_iterator ui = GV->use_begin(); ui != GV->use_end(); ++ui) {
  if(User *u = dyn_cast < User > (*ui)) {
    u->replaceUsesOfWith(GV, GEP);
  }
}

===========================
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