[PATCH] D58238: [DebugInfo] MachineSink: Insert undef DBG_VALUEs when sinking instructions, try to forward copies

Wed Oct 30 16:04:47 PDT 2019

leonardchan added a comment.

In D58238#1727932 <https://reviews.llvm.org/D58238#1727932>, @aprantl wrote:

> Is the extra cost here, or is it more work being generated for LiveDebugValues?

I'm not sure what under the hood is causing this longer compile time. The most I can tell from a time trace is that a lot of the time is taken up in the backend. I've filed https://bugs.llvm.org/show_bug.cgi?id=43855 to track this. @jmorse could you look into this when you get the chance? Thanks.

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D58238/new/

https://reviews.llvm.org/D58238