[PATCH] D139780: [AMDGPU] Unify divergent nodes if the PostDom tree has one root

[Anshil Gandhi via Phabricator via llvm-commits]

gandhi21299 added inline comments.


================
Comment at: llvm/test/CodeGen/AMDGPU/agpr-copy-no-free-registers.ll:657
+; GFX908-NEXT:    s_mov_b64 s[22:23], -1
 ; GFX908-NEXT:    s_branch .LBB3_4
 ;
----------------
ruiling wrote:
> ruiling wrote:
> > Why there is no DummyReturnBlock for GFX908?
> Did you try to get the answer for the question? It sounds strange we get different behavior for gfx908 and gfx90A here.
In gfx908, the block is eliminated much later in the pipeline which does not happen in gfx90a.


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https://reviews.llvm.org/D139780