[PATCH] D120544: [AMDGPU] Omit unnecessary waitcnt before barriers

[Austin Kerbow via Phabricator via llvm-commits]

kerbowa added a comment.

The test waitcnt-vscnt.ll is kind of muddied by this patch. It was relying on the behavior of s_barrier always adding s_waitcnt_vscnt at barriers if there were any outstanding events. The singlethread fences were not actually doing anything. I've added workgroup fences instead. With workgroup fences we currently always add the waitcnt. The test will look as it did before after my memory legalizer/waitcnt overhaul so that these are optimized. Consider this a precommit of this test for now.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D120544/new/

https://reviews.llvm.org/D120544