[PATCH] D91386: [PowerPC] Add peephole to remove redundant accumulator prime/unprime instructions

[Baptiste Saleil via Phabricator via llvm-commits]

bsaleil created this revision.
bsaleil added reviewers: nemanjai, saghir, PowerPC.
bsaleil added projects: LLVM, PowerPC.
Herald added subscribers: llvm-commits, shchenz, kbarton, hiraditya.
bsaleil requested review of this revision.

In some situations, the compiler may insert an accumulator prime instruction and an accumulator unprime instruction with no use of that accumulator between the two.
That's for example the case when we store an accumulator after assembling it or restoring it. This patch adds a peephole to remove these prime and unprime instructions.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D91386

Files:
  llvm/lib/Target/PowerPC/PPCPreEmitPeephole.cpp
  llvm/test/CodeGen/PowerPC/mma-acc-memops.ll
  llvm/test/CodeGen/PowerPC/mma-intrinsics.ll

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