llvm dev - Feb 2012 - [LLVMdev] addRequired vs addPreserved

what are the differences between the addRequired  and addPreserved in
LLVM Pass Managers.

Thanks

On Feb 15, 2012, at 8:34 AM, Xin Tong wrote:
> what are the differences between the addRequired  and addPreserved in
> LLVM Pass Managers.
The doc @ http://llvm.org/docs/WritingAnLLVMPass.html#AU::addRequired has the
info you need.
-
Devang