[LLVMdev] question about PRE

[Jiyu Zhang]

Hi, I am Jill, I'm new here and new with llvm. I find that its old
PRE.cpp has been removed from llvm-1.9 and the project homepage says
that a GVN-PRE pass is being implemented.
Since many PRE algorithms have been suggested, and I think PRE further
differs according to the specific defination of equivalence, whether
it is an "optimal" algorithm and optimal at what metric, etc, can I
ask what differences you're going to make between this one and the old
pass, and based on which algorithm you are going to develop?
Thanks:)
-- 
Jill