[PATCH] D33614: Cloning: Fix debug info cloning

[Gor Nishanov via Phabricator via llvm-commits]

GorNishanov added inline comments.


================
Comment at: lib/IR/DebugLoc.cpp:170
+
+    auto *NewVar = DILocalVariable::get(
+      Ctx,
----------------
GorNishanov wrote:
> dblaikie wrote:
> > Is there a reason this can't be distinct anymore?
> > 
> > You mentioned in the description: "I added caching, but, it is not sufficient, since dbg.value may refer to various expressions representing the same user var, thus, switching form getDistinct to get is important."
> > 
> > But I don't follow quite what you're saying there - could you explain it in more detail/in another way?
> > 
> > What happens without changing this to 'get'?
> It can still creates duplicate DILocalVariables. I have it in the very large test case, I can see if I can reduce it to something manangable. Thank you for looking at this!
Hah. Cache by itself does not work since it is cleared for every basic block.
I am not sure what are the implications of moving it outside of CloneBasicBlock.

I would keep the cache where it is, and keep get as opposed to getDistinct to collapse duplicate LocalVariables to the same one.


https://reviews.llvm.org/D33614