[PATCH] D30572: Remove equal BBs from a function

[Matthias Braun via Phabricator via llvm-commits]

MatzeB added a comment.

In https://reviews.llvm.org/D30572#707568, @avt77 wrote:

>




> And more: TailMerging works with return only or with unconditional jumps as well?

Given something like

BB0:

  A
  B
  C
  RET

BB1:

  C
  RET

BB2:

  B
  C
  RET

tail merging should give you something like:

BB0:

  A
  B
  # fallthrough

BB1:

  C
  RET

BB2:

  B
  JMP BB1

That's at least my understanding, but I am no expert in the pass. Better do your own experiments/code reading.


https://reviews.llvm.org/D30572