[PATCH] D144099: [WIP][AMDGPU] Fold more AGPR copies/PHIs in SIFoldOperands

[Pierre van Houtryve via Phabricator via llvm-commits]

Pierre-vh updated this revision to Diff 497965.
Pierre-vh marked 3 inline comments as done.
Pierre-vh added a comment.

The last big regression is now in test_mfma_loop_agpr_init on gfx908 where agpr-to-agpr copies are annoying.
I'm not sure yet how to fix that one, it seems to be because after PHIs are removed, we end up with copies like

  %83.sub1:areg_1024 = COPY %83.sub0:areg_1024

all over the place so after RA/removing RA pseudos, we get a lot of code to copy sub0 to sub1-31.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D144099/new/

https://reviews.llvm.org/D144099

Files:
  llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
  llvm/test/CodeGen/AMDGPU/acc-ldst.ll
  llvm/test/CodeGen/AMDGPU/mfma-loop.ll

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